JP2017133789A - Hot water storage type water heater, and hot water supply method by hot water storage type water heater - Google Patents

Hot water storage type water heater, and hot water supply method by hot water storage type water heater Download PDF

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JP2017133789A
JP2017133789A JP2016015823A JP2016015823A JP2017133789A JP 2017133789 A JP2017133789 A JP 2017133789A JP 2016015823 A JP2016015823 A JP 2016015823A JP 2016015823 A JP2016015823 A JP 2016015823A JP 2017133789 A JP2017133789 A JP 2017133789A
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hot water
water supply
temperature
water storage
mixing valve
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JP6498133B2 (en
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赳弘 古谷野
Takehiro Koyano
赳弘 古谷野
章吾 玉木
Shogo Tamaki
章吾 玉木
正樹 豊島
Masaki Toyoshima
正樹 豊島
史人 竹内
Norito Takeuchi
史人 竹内
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Mitsubishi Electric Corp
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  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type water heater which has a simple structure, and which can supply hot water at a preset temperature stably in the case of supplying hot water continuously, and to provide a hot water supply method by the hot water storage type water heater.SOLUTION: A hot water storage type water heater includes a heating part, a hot water storage tank, a plurality of hot water tapping pipelines, a water supply pipeline, a plurality of mixing valves and a control part. The control part controls the opening/closing of the plurality of mixing valves according to the temperature change of the hot water in the hot water storage tank detected by a plurality of stored hot water temperature detection part, performs switching of the pipeline used for hot water supply to a hot water supply object, and during the hot water supply to the hot water supply object, restricts the switching of the pipelines.SELECTED DRAWING: Figure 1

Description

本発明は、温水の貯湯および給湯が可能な貯湯式給湯機、および貯湯式給湯機での給湯方法に関するものである。   The present invention relates to a hot water storage type water heater capable of storing hot water and supplying hot water, and a hot water supply method in the hot water storage type hot water heater.

従来、貯湯式給湯機は、加熱手段で加熱された湯水を貯湯タンク上部から成層状態で貯湯し、貯湯した湯水を給湯に利用する配管(出湯配管)で貯湯タンク上部から取出し、市水(低温水)と混合して設定温度の湯水を給湯端末に給湯していた。近年、貯湯式給湯機は、高機能化が進み、貯湯タンク内の湯水を単に給湯するだけに限られず、風呂水の保温、床暖房などの用途にも利用されている。   Conventional hot water storage water heaters store hot water heated by heating means in a stratified state from the upper part of the hot water storage tank, take out the hot water stored in the hot water tank (outlet piping) from the upper part of the hot water storage tank, and supply city water (low temperature) And hot water at the set temperature was supplied to the hot water supply terminal. In recent years, hot water storage type hot water heaters have been improved in functionality and are not limited to merely supplying hot water in hot water storage tanks, but are also used for purposes such as warming bath water and floor heating.

貯湯タンク内の高温の湯水(高温水)を風呂水の保温、床暖房などの用途に利用すると、当該高温水は利用後に温度が低下し中温水として貯湯タンクの中間部に貯湯される。この中温水を有効に利用するため、貯湯タンクの高さ方向に2つ以上の出湯配管を有する貯湯式給湯機が普及している。   When hot water (hot water) in a hot water storage tank is used for purposes such as bath water insulation and floor heating, the temperature of the hot water drops after use and is stored in the middle of the hot water storage tank as intermediate hot water. In order to effectively use this medium-temperature water, a hot water storage type water heater having two or more hot water discharge pipes in the height direction of the hot water storage tank has been widespread.

この貯湯式給湯機では、設定温度および貯湯タンク内の温度分布の情報により出湯配管を切替え、切替えた出湯配管から供給される湯水を混合弁にて混合させて給湯を行う。出湯配管を切替えることで貯湯タンク内の湯水を有効に利用できるので、より効率的に運転することができる。しかし、貯湯式給湯機は、設定温度の湯水を継続して給湯するためには、貯湯タンク内の温度変化を考慮して出湯配管を切替える制御が必要となる。   In this hot water storage type hot water supply apparatus, hot water supply is performed by switching the hot water supply piping based on the set temperature and the temperature distribution information in the hot water storage tank, and mixing hot water supplied from the switched hot water supply piping with a mixing valve. Since the hot water in the hot water storage tank can be used effectively by switching the hot water supply piping, it is possible to operate more efficiently. However, in order to continuously supply hot water at a set temperature, the hot water storage type water heater needs to control the hot water supply piping to be changed in consideration of the temperature change in the hot water storage tank.

出湯配管の変更は、混合弁の開閉によって行われる。複数の混合弁を制御して給湯を行う貯湯式給湯機では、フィードバック制御の応答速度が各混合弁において同一であれば、一方の混合弁の開度変更に伴う湯温の変化に対応して他の混合弁の開度を変更する制御が追い付かない。そのため、貯湯式給湯機では、給湯する湯水の温度が設定温度に対してオーバーシュートまたはアンダーシュートする現象が生じる。   The change of the hot water piping is performed by opening and closing the mixing valve. In a hot water storage type hot water heater that supplies hot water by controlling a plurality of mixing valves, if the response speed of feedback control is the same in each mixing valve, it corresponds to the change in hot water temperature due to the change in the opening of one mixing valve. Control to change the opening of other mixing valves cannot keep up. Therefore, in the hot water storage type water heater, a phenomenon occurs in which the temperature of the hot water to be supplied overshoots or undershoots with respect to the set temperature.

特許文献1に記載の貯湯式給湯機では、一方の混合弁に対するフィードバック制御の応答速度を低速にし、その開度変更に伴う湯水の温度の変化を小さくして、他の混合弁の開度を変更する制御を追従させている。そのため、特許文献1に記載の貯湯式給湯機では、給湯する湯水の温度が設定温度に対してオーバーシュートまたはアンダーシュートする現象が生じるのを大幅に低減している。   In the hot water storage type water heater described in Patent Document 1, the response speed of the feedback control for one mixing valve is reduced, the change in the temperature of the hot water accompanying the opening change is reduced, and the opening of the other mixing valve is reduced. The control to change is made to follow. Therefore, in the hot water storage type water heater described in Patent Document 1, occurrence of a phenomenon in which the temperature of hot water to supply hot water overshoots or undershoots with respect to a set temperature is greatly reduced.

特開2004−340461号公報JP 2004-340461 A

しかし、特許文献1に記載の貯湯式給湯機は、一方の混合弁に対するフィードバック制御の応答速度を低速にしただけであるため、利用する出湯配管に切替える場合に生じる給湯する湯水温度の不安定性を解消することができない。また、特許文献1に記載の貯湯式給湯機では、それぞれの混合弁の出口での湯水の温度をもとに、フィードバック制御を行うため、全ての混合弁の出口に温度計を設置する必要があるため構成が複雑になる。   However, since the hot water storage type hot water heater described in Patent Document 1 only reduces the response speed of the feedback control for one mixing valve, the instability of the temperature of hot water to be supplied when switching to the hot water supply pipe to be used is reduced. It cannot be resolved. Moreover, in the hot water storage type water heater described in Patent Document 1, since feedback control is performed based on the temperature of hot water at the outlet of each mixing valve, it is necessary to install thermometers at the outlets of all the mixing valves. This complicates the configuration.

本発明は、上述のような課題を解決するためになされたもので、継続して給湯する場合に安定して設定温度の湯水を給湯することができる貯湯式給湯機、および貯湯式給湯機での給湯方法を提供することを目的とする。   The present invention has been made to solve the above-described problems, and is a hot water storage type water heater and a hot water storage type water heater that can stably supply hot water at a set temperature when continuously supplying hot water. The purpose is to provide a hot water supply method.

本発明の貯湯式給湯機は、湯水を加熱する加熱部と、加熱部で加熱した温水を貯湯する貯湯タンクと、貯湯タンクから湯水を取り出す複数の出湯配管と、低温水を供給する給水配管と、複数の出湯配管および給水配管のうち少なくとも2つの配管から供給される異なる温度の湯水を混合する複数の混合弁と、貯湯タンク内の湯水の温度を検出する複数の貯湯温度検出部と、複数の混合弁の開閉を制御する制御部と、を備え、制御部は、複数の貯湯温度検出部で検出した貯湯タンク内の湯水の温度変化に応じて複数の混合弁の開閉を制御して、給湯対象への給湯に利用する配管の切替えを行い、給湯対象への給湯中に、当該配管の切替えを制限する。   The hot water storage type water heater of the present invention includes a heating unit for heating hot water, a hot water storage tank for storing hot water heated by the heating unit, a plurality of hot water outlet pipes for extracting hot water from the hot water storage tank, and a water supply pipe for supplying low temperature water. A plurality of mixing valves for mixing hot water of different temperatures supplied from at least two of the plurality of hot water supply pipes and water supply pipes, a plurality of hot water storage temperature detectors for detecting the temperature of hot water in the hot water storage tank, and a plurality of A control unit that controls the opening and closing of the mixing valve, and the control unit controls the opening and closing of the plurality of mixing valves according to the temperature change of the hot water in the hot water storage tank detected by the plurality of hot water storage temperature detection units, The piping to be used for hot water supply to the hot water supply target is switched, and the switching of the pipe is restricted during the hot water supply to the hot water supply target.

本発明の貯湯式給湯機での給湯方法は、湯水を加熱する加熱部と、加熱部で加熱した温水を貯湯する貯湯タンクと、貯湯タンクから湯水を取り出す複数の出湯配管と、低温水を供給する給水配管と、複数の出湯配管および給水配管のうち少なくとも2つの配管から供給される異なる温度の湯水を混合する複数の混合弁と、貯湯タンク内の湯水の温度を検出する複数の貯湯温度検出部と、複数の混合弁の開閉を制御する制御部とを備える貯湯式給湯機での給湯方法であって、複数の貯湯温度検出部で検出した貯湯タンク内の湯水の温度変化を検出する検出ステップと、検出した貯湯タンク内の湯水の温度変化に応じて複数の混合弁の開閉を制御して、給湯対象への給湯に利用する配管の切替えを行うか否かを判定する判定ステップと、判定ステップで配管の切替えを行うと判定した場合に、給湯対象への給湯中であれば配管の切替えを制限する制限ステップとを含む。   The hot water supply method in the hot water storage type hot water supply apparatus of the present invention includes a heating unit for heating hot water, a hot water storage tank for storing hot water heated by the heating unit, a plurality of hot water pipings for extracting hot water from the hot water storage tank, and low temperature water Water supply pipes, a plurality of mixing valves for mixing hot water of different temperatures supplied from at least two of the plurality of hot water supply pipes and water supply pipes, and a plurality of hot water storage temperature detections for detecting the temperature of the hot water in the hot water storage tank A hot water supply method for a hot water storage type hot water heater comprising a control unit for controlling the opening and closing of a plurality of mixing valves, and detecting a temperature change of hot water in a hot water storage tank detected by a plurality of hot water storage temperature detection units A determination step for determining whether or not to switch the piping used for hot water supply to the hot water supply target by controlling the opening and closing of the plurality of mixing valves according to the detected temperature change of the hot water in the hot water storage tank; Judgment step When it is determined that switches the piping flop, and a limiting step of limiting the switching of the pipe if it is in the hot water supply to the hot water supply target.

本発明によれば、給湯対象への給湯に利用する配管の切替えを行い、給湯対象への給湯中に、当該配管の切替えを制限するので、継続して給湯する場合に安定して設定温度の湯水を給湯することができる。   According to the present invention, the piping to be used for hot water supply to the hot water supply target is switched and the switching of the pipe is restricted during the hot water supply to the hot water supply target. Hot water can be supplied.

本発明の実施の形態1に係る貯湯式給湯機を説明するための構成図である。It is a block diagram for demonstrating the hot water storage type hot water supply machine which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機の制御システムを説明するためのブロック図である。It is a block diagram for demonstrating the control system of the hot water storage type hot water heater which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機で沸き上げ運転を行う場合の動作を説明するための構成図である。It is a block diagram for demonstrating operation | movement in the case of performing a boiling operation with the hot water storage type hot water heater which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機で給湯様式Aと給湯様式Bとを切替える動作を説明するための構成図である。It is a block diagram for demonstrating the operation | movement which switches the hot water supply style A and the hot water supply style B with the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機で給湯様式Aによる一般給湯運転を行う場合の動作を説明するための構成図である。It is a block diagram for demonstrating operation | movement in the case of performing the general hot water supply operation by the hot water supply style A with the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機で給湯様式Bによる一般給湯運転を行う場合の動作を説明するための構成図である。It is a block diagram for demonstrating operation | movement in the case of performing the general hot water supply operation by the hot water supply style B with the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機で沸き上げ・一般給湯の同時運転を行う場合の動作を説明するための構成図である。It is a block diagram for demonstrating operation | movement in the case of performing simultaneous operation of boiling and general hot water supply with the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機で沸き上げ・一般給湯の同時運転を行う場合の別の動作を説明するための構成図である。It is a block diagram for demonstrating another operation | movement in the case of performing simultaneous operation of boiling and general hot water supply with the hot water storage type hot water heater which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機での運転制御の一例を示すフローチャートである。It is a flowchart which shows an example of the operation control in the hot water storage type water heater which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機での運転制御の別の一例を示すフローチャートである。It is a flowchart which shows another example of the operation control in the hot water storage type hot water heater which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る貯湯式給湯機で給湯様式Aから給湯様式Bへの切替えの際の、混合弁の開閉、給湯端末に供給する湯水の温度の時間変化を説明するための図である。The figure for demonstrating the time change of the temperature of the hot water supplied to the opening and closing of a mixing valve, the hot water supply terminal in the case of the switching from the hot water supply style A to the hot water supply style B with the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention. It is. 本発明の実施の形態1に係る貯湯式給湯機で給湯様式Bから給湯様式Aへの切替えの際の、混合弁の開閉、給湯端末に供給する湯水の温度の時間変化を説明するための図である。The figure for demonstrating the time change of the temperature of the hot water supplied to the opening and closing of a mixing valve, and a hot-water supply terminal in the case of the switching from the hot-water supply style B to the hot-water supply style A with the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention. It is. 本発明の実施の形態2に係る貯湯式給湯機を説明するための構成図である。It is a block diagram for demonstrating the hot water storage type hot water heater which concerns on Embodiment 2 of this invention. 本発明の実施の形態2に係る貯湯式給湯機で給湯様式Aによる一般給湯運転を行う場合の動作を説明するための構成図である。It is a block diagram for demonstrating operation | movement in the case of performing the general hot water supply operation by the hot water supply style A with the hot water storage type hot water supply machine which concerns on Embodiment 2 of this invention. 本発明の実施の形態2に係る貯湯式給湯機で給湯様式Bによる一般給湯運転を行う場合の動作を説明するための構成図である。It is a block diagram for demonstrating the operation | movement in the case of performing the general hot water supply operation by the hot water supply style B with the hot water storage type hot water supply apparatus which concerns on Embodiment 2 of this invention. 本発明の実施の形態2に係る貯湯式給湯機での運転制御の一例を示すフローチャートである。It is a flowchart which shows an example of the operation control in the hot water storage type water heater which concerns on Embodiment 2 of this invention.

以下、図面を参照して、本発明の実施の形態について説明する。なお、本明細書で使用する各図においては、共通する要素に同一の符号付けするものとする。また、本発明は、以下の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々に変形することが可能である。また本明細書において、「湯水」とは、温水(湯)および水を総称している。また、「低温水」とは、例えば水道等と同様の温度が低い水を意味し、「高温水」とはヒートポンプユニットなどで加熱された温度の高い温水(湯)を意味しているものとする。さらに、「中温水」とは、低温水よりも温度が高く、高温水よりも温度が低い温水であり、例えば貯湯タンクの中部に設けられた出湯配管から取り出される中程度の温度の湯水を意味しているものとする。   Embodiments of the present invention will be described below with reference to the drawings. In the drawings used in this specification, common elements are denoted by the same reference numerals. Further, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit of the present invention. In this specification, “hot water” is a generic term for hot water (hot water) and water. In addition, “low temperature water” means water having a low temperature similar to, for example, tap water, and “high temperature water” means high temperature hot water (hot water) heated by a heat pump unit or the like. To do. Furthermore, “medium temperature water” is warm water having a temperature higher than that of low temperature water and lower than that of high temperature water. For example, medium temperature hot water taken out from a hot water supply pipe provided in the middle of a hot water storage tank is meant. Suppose you are.

(実施の形態1)
図1は、本発明の実施の形態1に係る貯湯式給湯機を説明するための構成図である。図1に示す貯湯式給湯機は、ヒートポンプ式の加熱部を備える貯湯式ヒートポンプ給湯機35である。なお、本実施の形態1に係る貯湯式給湯機の加熱部は、ヒートポンプ式以外のガスバーナーや灯油バーナー等の燃焼バーナーなどの他の加熱部を用いてもよい。貯湯式ヒートポンプ給湯機35は、タンクユニット33と、ヒートポンプサイクルを利用するヒートポンプユニット(HPユニット6)と、リモコン43とを備えている。HPユニット6とタンクユニット33とは、HP往き配管13およびHP戻り配管14を介して接続されるとともに、図示しない配線を介して電気的に接続されている。
(Embodiment 1)
FIG. 1 is a configuration diagram for explaining a hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. The hot water storage type hot water heater shown in FIG. 1 is a hot water storage type heat pump water heater 35 including a heat pump type heating unit. In addition, you may use other heating parts, such as combustion burners, such as gas burners other than a heat pump type, and a kerosene burner, as the heating part of the hot water storage type hot water supply apparatus which concerns on this Embodiment 1. FIG. The hot water storage type heat pump water heater 35 includes a tank unit 33, a heat pump unit (HP unit 6) that uses a heat pump cycle, and a remote controller 43. The HP unit 6 and the tank unit 33 are connected to each other via an HP outgoing pipe 13 and an HP return pipe 14 and electrically connected via a wiring (not shown).

<装置構成>
HPユニット6は、貯湯タンク7の下部から供給される湯水を加熱する(沸上げる)加熱部で、ヒートポンプ式の加熱部である。なお、HPユニット6は、給水配管8から供給される湯水を直接加熱することができるように配管を接続してもよい。HPユニット6で加熱された湯水(高温水)は、運転形態に応じて、貯湯タンク7の上部に貯湯されるか、または、給湯対象に供給される。HPユニット6は、圧縮機1、水冷媒熱交換器2、膨張弁3および空気熱交換器5を冷媒配管4により環状に接続したもので、ヒートポンプサイクルを構成している。水冷媒熱交換器2は、冷媒配管4を流れる冷媒と、貯湯タンク7から供給される低温水との間で熱交換を行うためのものである。なお、水冷媒熱交換器2は、冷媒配管4を流れる冷媒と、水道等の水源から直接供給される低温水との熱交換を行う構成としてもよい。
<Device configuration>
The HP unit 6 is a heating unit that heats (boils) hot water supplied from the lower part of the hot water storage tank 7 and is a heat pump type heating unit. The HP unit 6 may be connected to a pipe so that hot water supplied from the water supply pipe 8 can be directly heated. Hot water (high-temperature water) heated by the HP unit 6 is stored in the upper part of the hot water storage tank 7 or supplied to the hot water supply object, depending on the operation mode. The HP unit 6 is formed by connecting the compressor 1, the water refrigerant heat exchanger 2, the expansion valve 3 and the air heat exchanger 5 in an annular shape by the refrigerant pipe 4, and constitutes a heat pump cycle. The water-refrigerant heat exchanger 2 is for exchanging heat between the refrigerant flowing through the refrigerant pipe 4 and the low-temperature water supplied from the hot water storage tank 7. The water-refrigerant heat exchanger 2 may be configured to perform heat exchange between the refrigerant flowing through the refrigerant pipe 4 and low-temperature water directly supplied from a water source such as water.

タンクユニット33には、貯湯タンク7を含めて、以下に述べる各種の部品、配管等が内蔵されている。貯湯タンク7は、HPユニット6により沸上げた高温水を貯湯するものである。貯湯タンク7の下部に設けられた水導入口7aには、第3給水配管8cが接続されている。水道等の水源から供給される低温水は、減圧弁31で所定圧力に調圧された上で、第3給水配管8cを通って貯湯タンク7内に流入する。貯湯タンク7の上部には、温水導入出口7dおよび温水導出口7eが設けられている。温水導入出口7dには、ふろ給湯配管20と、送湯配管12とが接続されている。温水導出口7eには、一般給湯配管19と、温水導入配管18aとが接続されている。一般給湯配管19は、貯湯タンク7の上部から温水を取出す出湯配管に相当する。   The tank unit 33 includes various parts, piping, and the like described below including the hot water storage tank 7. The hot water storage tank 7 stores hot water boiled by the HP unit 6. A third water supply pipe 8 c is connected to a water inlet 7 a provided at the lower part of the hot water storage tank 7. The low-temperature water supplied from a water source such as water supply is adjusted to a predetermined pressure by the pressure reducing valve 31 and then flows into the hot water storage tank 7 through the third water supply pipe 8c. A hot water inlet 7d and a hot water outlet 7e are provided in the upper part of the hot water tank 7. A hot water supply pipe 20 and a hot water supply pipe 12 are connected to the hot water introduction outlet 7d. A general hot water supply pipe 19 and a hot water introduction pipe 18a are connected to the hot water outlet 7e. The general hot water supply pipe 19 corresponds to a hot water discharge pipe that takes out hot water from the upper part of the hot water storage tank 7.

また、貯湯タンク7の表面には、複数の貯湯温度センサ41,42が高さを変えて取付けられている。これらの貯湯温度センサ41,42は、貯湯タンク7内の湯水の温度を検出するものである。制御装置36は、貯湯温度センサ41,42の検出結果に基づき、貯湯タンク7内の貯湯量を把握し、沸き上げ運転の開始および停止等の制御を行う。なお、複数の貯湯温度センサ41,42は、複数の貯湯温度検出部の具体例に相当している。   A plurality of hot water temperature sensors 41 and 42 are attached to the surface of the hot water tank 7 at different heights. These hot water storage temperature sensors 41 and 42 detect the temperature of hot water in the hot water storage tank 7. The control device 36 grasps the amount of hot water stored in the hot water storage tank 7 based on the detection results of the hot water storage temperature sensors 41 and 42, and controls the start and stop of the boiling operation. The plurality of hot water storage temperature sensors 41 and 42 correspond to a specific example of a plurality of hot water storage temperature detection units.

タンクユニット33には、熱源ポンプ11およびふろ用熱交換器18が内蔵されている。熱源ポンプ11は、タンクユニット33内の各種配管に湯水を循環させるためのポンプであり、HP往き配管13の途中に設けられている。ふろ用熱交換器18は、貯湯タンク7から供給される高温水を利用して2次側の加熱対象水(浴槽水、暖房用水等)を加熱するための熱交換器である。図1に示すふろ用熱交換器18の2次側の構成は、浴槽30内の湯水を循環させるふろ往き配管27およびふろ戻り配管28を例示している。ふろ用熱交換器18は、ふろ往き配管27と、ふろ戻り配管28と、浴槽30とで形成される循環経路の途中に設置されている。ふろ戻り配管28には、上記循環経路に浴槽水を循環させるふろ循環ポンプ29と、浴槽30から流出した浴槽水の温度を検出するふろ戻り温度センサ38と、浴槽30内の水位レベルを検出するための水位センサ45と、ふろ戻り配管28を流れる湯水の流れを検出するフロースイッチ46とが設けられている。ふろ往き配管27には、ふろ用熱交換器18から流出した湯水の温度を検出するふろ往き温度センサ37が設けられている。なお、ふろ往き温度センサ37は、給湯温度検出部の具体例に相当している。   The tank unit 33 incorporates the heat source pump 11 and the bath heat exchanger 18. The heat source pump 11 is a pump for circulating hot water through various pipes in the tank unit 33, and is provided in the middle of the HP outgoing pipe 13. The bath heat exchanger 18 is a heat exchanger for heating secondary water to be heated (tub water, heating water, etc.) using high-temperature water supplied from the hot water storage tank 7. The configuration of the secondary side of the bath heat exchanger 18 illustrated in FIG. 1 illustrates a bath piping 27 and a bath returning piping 28 that circulate hot water in the bathtub 30. The bath heat exchanger 18 is installed in the middle of a circulation path formed by the bath piping 27, the bath return piping 28, and the bathtub 30. In the bath return pipe 28, a bath circulation pump 29 that circulates bathtub water in the circulation path, a bath return temperature sensor 38 that detects the temperature of the bath water flowing out from the bath 30, and a water level in the bath 30 are detected. For this purpose, a water level sensor 45 and a flow switch 46 for detecting the flow of hot water flowing through the bath return pipe 28 are provided. The bathing pipe 27 is provided with a bathing temperature sensor 37 that detects the temperature of hot water flowing out of the bath heat exchanger 18. The forward temperature sensor 37 corresponds to a specific example of a hot water supply temperature detection unit.

また、タンクユニット33には、三方弁10、四方弁17が内蔵されている。三方弁10は、湯水が流入するa,bポートと、湯水が流出するcポートとを有する流路切り替え手段である。三方弁10は、3つの経路(経路ac,経路bc,経路abc)の間で湯水の流路を切替えるように構成されている。四方弁17は、湯水が流入するb,cポートと、湯水が流出するa,dポートとを有する流路切替手段である。四方弁17は、4つの経路(経路ad,経路ac,経路bd、経路cd)の間で湯水の流路を切替えるように構成されている。   The tank unit 33 includes a three-way valve 10 and a four-way valve 17. The three-way valve 10 is a flow path switching means having a and b ports through which hot water flows and a c port through which hot water flows out. The three-way valve 10 is configured to switch the hot water flow path between three paths (path ac, path bc, path abc). The four-way valve 17 is a flow path switching means having b and c ports through which hot water flows and a and d ports through which hot water flows out. The four-way valve 17 is configured to switch the hot water flow path between four paths (path ad, path ac, path bd, path cd).

また、タンクユニット33は、水導出口配管9、送湯配管12、HP往き配管13、HP戻り配管14、温水導入配管18a、第1バイパス配管15、温水導出配管18b、および第2バイパス配管16を備えている。水導出口配管9は、貯湯タンク7の下部に設けられた水導出口7bと三方弁10のaポートとを接続している。HP往き配管13は、三方弁10のcポートとHPユニット6の入口側とを接続している。HP戻り配管14は、HPユニット6の出口側と四方弁17のcポートとを接続している。HP戻り配管14には、HPユニット6から流出する湯水の温度(出湯温度)を検出するHP出湯温度センサ39が設けられている。   The tank unit 33 includes a water outlet port pipe 9, a hot water supply pipe 12, an HP outgoing pipe 13, an HP return pipe 14, a hot water introduction pipe 18 a, a first bypass pipe 15, a hot water outlet pipe 18 b, and a second bypass pipe 16. It has. The water outlet port 9 connects a water outlet 7 b provided at the lower part of the hot water storage tank 7 and the a port of the three-way valve 10. The HP outgoing pipe 13 connects the c port of the three-way valve 10 and the inlet side of the HP unit 6. The HP return pipe 14 connects the outlet side of the HP unit 6 and the c port of the four-way valve 17. The HP return pipe 14 is provided with an HP hot water temperature sensor 39 that detects the temperature (hot water temperature) of hot water flowing out from the HP unit 6.

送湯配管12は、四方弁17のdポートと、貯湯タンク7上部の温水導入出口7dとを接続している。第1バイパス配管15は、四方弁17のaポートと、貯湯タンク7の中央部から下部の間に設けられた温水導入口7cとを接続している。温水導入配管18aは、貯湯タンク7の温水導出口7eと、ふろ用熱交換器18の1次側入口とを接続している。温水導出配管18bは、ふろ用熱交換器18の1次側出口と三方弁10のbポートとを接続している。第2バイパス配管16は、HP往き配管13のうち熱源ポンプ11とHPユニット6との間の部位から分岐し、四方弁17のbポートに接続されている。   The hot water supply pipe 12 connects the d port of the four-way valve 17 and the hot water introduction outlet 7 d above the hot water storage tank 7. The first bypass pipe 15 connects the a port of the four-way valve 17 and a hot water inlet 7 c provided between the central part and the lower part of the hot water storage tank 7. The hot water introduction pipe 18 a connects the hot water outlet 7 e of the hot water storage tank 7 and the primary side inlet of the bath heat exchanger 18. The hot water outlet pipe 18 b connects the primary outlet of the bath heat exchanger 18 and the b port of the three-way valve 10. The second bypass pipe 16 branches from a portion of the HP outgoing pipe 13 between the heat source pump 11 and the HP unit 6 and is connected to the b port of the four-way valve 17.

さらに、タンクユニット33は、第1給水配管8a、第2給水配管8b、第1給湯用混合弁21、ふろ用混合弁22、第2給湯用混合弁23、第1給湯配管24および第2給湯配管25を備えている。第1給水配管8aの一端は、水道等の水源に接続されている。第1給水配管8aの他端には、減圧弁31を介して第2給水配管8bおよび第3給水配管8cが接続されている。第2給水配管8bは、途中から分岐してそれぞれ第1給湯用混合弁21とふろ用混合弁22とに接続されている。給水配管8は、これらの第1給水配管8a、第2給水配管8bおよび第3給水配管8cにより構成されている。また一般給湯配管19は貯湯タンク7の温水導出口7eと第1給湯用混合弁21に接続され、ふろ給湯配管20は貯湯タンク7の温水導入出口7dとふろ用混合弁22に接続されている。   Further, the tank unit 33 includes a first water supply pipe 8a, a second water supply pipe 8b, a first hot water supply mixing valve 21, a bath mixing valve 22, a second hot water supply mixing valve 23, a first hot water supply pipe 24, and a second hot water supply. A pipe 25 is provided. One end of the first water supply pipe 8a is connected to a water source such as a water supply. A second water supply pipe 8b and a third water supply pipe 8c are connected to the other end of the first water supply pipe 8a via a pressure reducing valve 31. The second water supply pipe 8b is branched from the middle and connected to the first hot water supply mixing valve 21 and the bath mixing valve 22, respectively. The water supply pipe 8 is constituted by the first water supply pipe 8a, the second water supply pipe 8b, and the third water supply pipe 8c. The general hot water supply pipe 19 is connected to the hot water outlet 7 e of the hot water storage tank 7 and the first hot water supply mixing valve 21, and the hot water supply pipe 20 is connected to the hot water introduction outlet 7 d of the hot water storage tank 7 and the hot water mixing valve 22. .

第2給湯用混合弁23は、第1給湯配管24の途中に設けられると共に、中温配管47と接続されている。中温配管47は、貯湯タンク7の中間部に設けられた中温導出口7fと第2給湯用混合弁23とを接続している。これにより、第2給湯用混合弁23は、貯湯タンク7の中温導出口7fから出湯される中温水と、第1給湯用混合弁21で混合された湯水とを混合させるものである。一方、ふろ用混合弁22の流出側には、第2給湯配管25が接続されている。第2給湯配管25の途中には、第2給湯配管25を開閉するふろ用電磁弁26と、第2給湯配管25を通る湯の流量を検出するフロースイッチ46aとが設けられている。   The second hot water supply mixing valve 23 is provided in the middle of the first hot water supply pipe 24 and is connected to the intermediate temperature pipe 47. The intermediate temperature pipe 47 connects the intermediate temperature outlet 7 f provided at the intermediate portion of the hot water storage tank 7 and the second hot water supply mixing valve 23. As a result, the second hot water supply mixing valve 23 mixes the hot water discharged from the intermediate temperature outlet 7f of the hot water storage tank 7 with the hot water mixed by the first hot water mixing valve 21. On the other hand, a second hot water supply pipe 25 is connected to the outflow side of the bath mixing valve 22. In the middle of the second hot water supply pipe 25, there are provided a solenoid valve 26 for opening and closing the second hot water supply pipe 25 and a flow switch 46 a for detecting the flow rate of hot water passing through the second hot water supply pipe 25.

第1給湯用混合弁21、第2給湯用混合弁23、およびふろ用混合弁22は、一般給湯配管19、ふろ給湯配管20から供給される高温水と、中温配管47から供給される中温水と、第2給水配管8bから供給される低温水との流量比を調整することにより、ユーザがリモコン43で設定した設定温度の湯水を生成する。そして、生成した湯水を第1給湯配管24および第2給湯配管25にそれぞれ供給する。第1給湯用混合弁21および第2給湯用混合弁23により温度調整された湯水は、第1給湯配管24から給湯栓34を経由して、ユーザが使用するシャワー、カラン等の蛇口(図示せず)に供給される。一方、ふろ用混合弁22により設定温度に調整された湯水は、第2給湯配管25からフロースイッチ46a、ふろ用電磁弁26、ふろ往き配管27を順次経由して浴槽30に供給される。なお、給湯栓34に接続される給湯端末が、給湯される給湯対象の具体例に相当している。   The first hot water supply mixing valve 21, the second hot water supply mixing valve 23, and the bath mixing valve 22 are hot water supplied from the general hot water supply pipe 19 and bath hot water supply pipe 20 and medium hot water supplied from the intermediate temperature pipe 47. And the hot water of the preset temperature which the user set with the remote control 43 is produced | generated by adjusting the flow rate ratio with the low temperature water supplied from the 2nd water supply piping 8b. Then, the generated hot water is supplied to the first hot water supply pipe 24 and the second hot water supply pipe 25, respectively. The hot water adjusted in temperature by the first hot water supply mixing valve 21 and the second hot water supply mixing valve 23 passes from the first hot water supply pipe 24 through the hot water tap 34 to a faucet (not shown) used by the user, such as a shower and a currant. )). On the other hand, the hot water adjusted to the set temperature by the bath mixing valve 22 is supplied from the second hot water supply pipe 25 to the bathtub 30 through the flow switch 46 a, the bath electromagnetic valve 26, and the bathing pipe 27 in order. The hot water supply terminal connected to the hot water tap 34 corresponds to a specific example of a hot water supply target to be supplied with hot water.

三方弁10は、水導出口配管9とHP往き配管13とが連通する形態(経路ac)と、温水導出配管18bとHP往き配管13とが連通する形態(経路bc)と、水導出口配管9とHP往き配管13と温水導出配管18bとが連通する形態(経路abc)とからなる3つの形態の何れかに切替えられる。四方弁17は、HP戻り配管14と送湯配管12とが連通する形態(経路cd)と、HP戻り配管14と第1バイパス配管15とが連通する形態(経路ac)と、第1バイパス配管15と第2バイパス配管16とが連通する形態(経路ab)と、送湯配管12と第2バイパス配管16とが連通する形態(経路bd)とからなる4つの形態の何れかに切替えられる。   The three-way valve 10 has a configuration in which the water outlet pipe 9 and the HP outgoing pipe 13 communicate with each other (path ac), a mode in which the hot water outlet pipe 18b and the HP outgoing pipe 13 communicate with each other (path bc), and a water outlet port pipe. 9, the HP outgoing pipe 13, and the hot water outlet pipe 18 b are switched to any one of the three forms (path abc). The four-way valve 17 includes a form (path cd) in which the HP return pipe 14 and the hot water supply pipe 12 communicate with each other, a form (path ac) in which the HP return pipe 14 and the first bypass pipe 15 communicate with each other, and a first bypass pipe. 15 and the second bypass pipe 16 communicate with each other (path ab) and the hot water supply pipe 12 and the second bypass pipe 16 communicate with each other (path bd).

次に、貯湯式ヒートポンプ給湯機35を制御する制御装置36について説明する。図2は、本発明の実施の形態1に係る貯湯式給湯機の制御システムを説明するためのブロック図である。図2に示す貯湯式ヒートポンプ給湯機35の制御システムには、制御装置36およびこれに接続されるリモコン43、貯湯温度センサ41、熱源ポンプ11等の構成が図示されている。各種温度センサ、フロースイッチ46,46a、水位センサ45によって検出された各諸量は、測定部49に入力される。測定部49に入力された各諸量はデータに変換され、演算部50に送られる。演算部50は、測定部49から送られてきたデータに基づき、制御部51で実行する制御コマンドを生成する。制御部51は、演算部50で生成された制御コマンドに基づき、HPユニット6、熱源ポンプ11などの機器を制御する。また、記憶部52は、予め定められた定数やリモコン43から送信される設定値等のデータを記憶している。演算部50は、必要に応じて記憶部52に記憶している記憶内容を参照、および書き換えを実施することが可能である。なお、測定部49、演算部50、制御部51はマイコンにより構成され、記憶部52は半導体メモリなどによって構成されている。   Next, the control device 36 that controls the hot water storage type heat pump water heater 35 will be described. FIG. 2 is a block diagram for explaining a control system for a hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. The control system of the hot water storage type heat pump water heater 35 shown in FIG. 2 shows the configuration of the control device 36 and the remote controller 43 connected thereto, the hot water storage temperature sensor 41, the heat source pump 11, and the like. Various amounts detected by the various temperature sensors, the flow switches 46 and 46a, and the water level sensor 45 are input to the measuring unit 49. Each quantity input to the measurement unit 49 is converted into data and sent to the calculation unit 50. The calculation unit 50 generates a control command to be executed by the control unit 51 based on the data sent from the measurement unit 49. The control unit 51 controls devices such as the HP unit 6 and the heat source pump 11 based on the control command generated by the calculation unit 50. Further, the storage unit 52 stores data such as predetermined constants and setting values transmitted from the remote controller 43. The computing unit 50 can refer to and rewrite the stored content stored in the storage unit 52 as necessary. The measurement unit 49, the calculation unit 50, and the control unit 51 are configured by a microcomputer, and the storage unit 52 is configured by a semiconductor memory or the like.

リモコン43は、ユーザが運転動作指令および設定値の変更操作を入力するための入力手段であり、浴槽30に給湯する湯水の設定温度や給湯栓34から給湯する湯水の設定温度を設定する手段でもある。リモコン43には、図示していないが貯湯式ヒートポンプ給湯機35の状態等の情報を表示する表示部、ユーザが操作するスイッチ等の操作部、スピーカ、マイク等が搭載されている。制御装置36は、各種センサによって検出された各諸量、リモコン43の設定温度等の情報に基づいてHPユニット6、熱源ポンプ11などの機器を駆動することにより、貯湯式ヒートポンプ給湯機35を制御することができる。貯湯式ヒートポンプ給湯機35で実行される制御には、沸き上げ運転、一般給湯運転等があり、以下、これらの制御について説明する。   The remote controller 43 is an input means for the user to input a driving operation command and a setting value changing operation, and is a means for setting a set temperature of hot water to be supplied to the bathtub 30 and a set temperature of hot water to be supplied from the hot water tap 34. is there. Although not shown, the remote controller 43 is equipped with a display unit that displays information such as the state of the hot water storage heat pump water heater 35, an operation unit such as a switch operated by the user, a speaker, a microphone, and the like. The control device 36 controls the hot water storage type heat pump water heater 35 by driving devices such as the HP unit 6 and the heat source pump 11 on the basis of various amounts detected by various sensors and information such as the set temperature of the remote controller 43. can do. Controls executed by the hot water storage type heat pump water heater 35 include a boiling operation, a general hot water supply operation, and the like, and these controls will be described below.

<沸き上げ運転>
図3は、本発明の実施の形態1に係る貯湯式給湯機で沸き上げ運転を行う場合の動作を説明するための構成図である。図3に示す貯湯式ヒートポンプ給湯機35の沸き上げ運転では、HPユニット6により貯湯タンク7内の湯水を加熱する運転を行うものである。まず、沸き上げ運転では、三方弁10の経路を経路acに保持し、四方弁17の経路を経路cdに保持する。つまり、三方弁10は、水導出口配管9とHP往き配管13とを連通させ、四方弁17は、HP戻り配管14と送湯配管12とを連通させる。
<Boiling operation>
FIG. 3 is a configuration diagram for explaining an operation in the case where a boiling operation is performed in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. In the boiling operation of the hot water storage type heat pump water heater 35 shown in FIG. 3, the hot water in the hot water storage tank 7 is heated by the HP unit 6. First, in the boiling operation, the path of the three-way valve 10 is held in the path ac, and the path of the four-way valve 17 is held in the path cd. That is, the three-way valve 10 communicates the water outlet pipe 9 and the HP outgoing pipe 13, and the four-way valve 17 communicates the HP return pipe 14 and the hot water supply pipe 12.

沸き上げ運転では、三方弁10の経路を経路ac、四方弁17の経路を経路cdのそれぞれに保持した状態で、HPユニット6および熱源ポンプ11を駆動する。これにより、貯湯タンク7の下部から流出する低温水は、水導出口配管9、三方弁10、熱源ポンプ11およびHP往き配管13を順次経由してHPユニット6に流入し、HPユニット6で加熱される。そして、HPユニット6で加熱した高温水は、HP戻り配管14、四方弁17、送湯配管12を順次経由して、貯湯タンク7の温水導入出口7dに流入し、貯湯タンク7の内部に貯湯される。沸き上げ運転を実行することで、貯湯タンク7の内部には、上部側から高温水が貯留される。貯湯タンク7の内部での貯湯量は、貯湯温度センサ41,42により検出される。そして、沸き上げ運転は、貯湯量が予め設定された基準の量を超えた時点で終了し、熱源ポンプ11およびHPユニット6が停止する。   In the boiling operation, the HP unit 6 and the heat source pump 11 are driven in a state where the path of the three-way valve 10 is held in the path ac and the path of the four-way valve 17 is held in the path cd. As a result, the low-temperature water flowing out from the lower part of the hot water storage tank 7 flows into the HP unit 6 via the water outlet port pipe 9, the three-way valve 10, the heat source pump 11 and the HP outgoing pipe 13 in order, and is heated by the HP unit 6. Is done. The hot water heated by the HP unit 6 flows into the hot water introduction outlet 7d of the hot water tank 7 through the HP return pipe 14, the four-way valve 17, and the hot water supply pipe 12 in this order, and stores hot water in the hot water tank 7. Is done. By performing the boiling operation, high temperature water is stored in the hot water storage tank 7 from the upper side. The amount of hot water stored in the hot water storage tank 7 is detected by hot water storage temperature sensors 41 and 42. The boiling operation ends when the amount of stored hot water exceeds a preset reference amount, and the heat source pump 11 and the HP unit 6 are stopped.

HPユニット6は、沸き上げ運転時、要求される加熱能力によって圧縮機1の動作を決定する。また、熱源ポンプ11は、HP出湯温度センサ39で検出される温度が所定の温度になるように回転数をコントロールして、HPユニット6に供給する低温水の量を調整している。   The HP unit 6 determines the operation of the compressor 1 according to the required heating capacity during the boiling operation. Further, the heat source pump 11 adjusts the amount of low-temperature water supplied to the HP unit 6 by controlling the rotational speed so that the temperature detected by the HP hot water temperature sensor 39 becomes a predetermined temperature.

<一般給湯運転>
次に、貯湯式ヒートポンプ給湯機35の一般給湯運転について説明する。ここで、一般給湯運転とは、貯湯タンク7に貯留されている温水と、水道等の水源から供給される低温水とを第1給湯用混合弁21で混合して、ユーザがリモコン43で設定した設定温度の湯水を給湯栓34の先に連結された給湯端末から供給する運転である。なお、一般給湯運転は、ユーザが給湯端末の蛇口を解放した場合に実行される運転である。貯湯式ヒートポンプ給湯機35では、貯湯タンク7の中温導出口7fから中温水を出湯することができる構成であるため、中温水を利用して高温水と中温水とを混合する給湯様式A(高温水+中温水での給湯)と、中温水を利用せず高温水と低温水とを混合する給湯様式B(高温水+低温水での給湯)との2つの運転様式を有する。なお、給湯様式Aと給湯様式Bとの運転様式を切替えることは、給湯に利用する配管(出湯配管)を、貯湯タンク7の中温導出口7fから中温水を出湯する中温配管47と、水道等の水源から低温水を供給する給水配管8とで切替えることでもある。
<General hot water supply operation>
Next, the general hot water supply operation of the hot water storage type heat pump water heater 35 will be described. Here, in the general hot water supply operation, the hot water stored in the hot water storage tank 7 and the low-temperature water supplied from a water source such as tap water are mixed by the first hot water supply mixing valve 21 and set by the user using the remote controller 43. In this operation, hot water having the set temperature is supplied from a hot water supply terminal connected to the tip of the hot water tap 34. The general hot water supply operation is an operation that is executed when the user releases the faucet of the hot water supply terminal. The hot water storage type heat pump water heater 35 is configured to discharge hot water from the hot water outlet 7f of the hot water storage tank 7. Therefore, hot water supply mode A (high temperature water is used to mix hot water and hot water using hot water. There are two operation modes: hot water supply with water + hot water in medium temperature and hot water supply mode B (hot water supply with high temperature water + low temperature water) in which high temperature water and low temperature water are mixed without using medium temperature water. Note that switching the operation mode between the hot water supply style A and the hot water supply style B means that the pipe used for hot water supply (the hot water supply pipe), the intermediate temperature pipe 47 for discharging hot water from the intermediate temperature outlet 7f of the hot water storage tank 7, the water supply, etc. It is also possible to switch between the water supply pipe 8 for supplying low temperature water from the water source.

図4は、本発明の実施の形態1に係る貯湯式給湯機で給湯様式Aと給湯様式Bとを切替える動作を説明するための構成図である。図4では、ユーザがリモコン43で設定した設定温度と中温水の温度との関係により給湯様式Aと給湯様式Bとを切替えることが図示されている。まず、設定温度に対して中温水の温度が低い場合、中温水を利用して高温水と中温水とを混合する給湯様式Aで一般給湯運転を行う。一方、設定温度に対して中温水の温度が高い場合、高温水と中温水を混合しても設定温度の湯水を作り出すことができないため、中温水を利用せず高温水と低温水とを混合する給湯様式Bで一般給湯運転を行う。   FIG. 4 is a configuration diagram for explaining the operation of switching between hot water supply mode A and hot water supply mode B in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. FIG. 4 shows that the hot water supply mode A and the hot water supply mode B are switched according to the relationship between the set temperature set by the user with the remote controller 43 and the temperature of the medium hot water. First, when the temperature of the intermediate temperature water is lower than the set temperature, the general hot water supply operation is performed in the hot water supply mode A in which the high temperature water and the intermediate temperature water are mixed using the intermediate temperature water. On the other hand, when the temperature of the medium-temperature water is higher than the set temperature, mixing the high-temperature water and the medium-temperature water cannot produce hot water at the set temperature, so the high-temperature water and the low-temperature water are mixed without using the medium-temperature water. General hot water supply operation is performed in hot water supply style B.

[給湯様式Aによる一般給湯運転]
図5は、本発明の実施の形態1に係る貯湯式給湯機で給湯様式Aによる一般給湯運転を行う場合の動作を説明するための構成図である。図5に示す貯湯式ヒートポンプ給湯機35の給湯様式Aによる一般給湯運転では、第1給湯用混合弁21のaポートを全閉状態で保持し、第2給水配管8bから第2給湯用混合弁23に向かう流路を遮断している。
[General hot water supply operation by hot water supply style A]
FIG. 5 is a configuration diagram for explaining an operation in the case of performing a general hot water supply operation in the hot water supply mode A in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. In the general hot water supply operation according to the hot water supply mode A of the hot water storage type heat pump water heater 35 shown in FIG. 5, the a port of the first hot water supply mixing valve 21 is held in a fully closed state, and the second hot water supply mixing valve 8b is connected to the second hot water supply pipe 8b. The flow path toward 23 is blocked.

給湯様式Aによる一般給湯運転では、第1給湯用混合弁21のaポートが全閉状態で給湯端末の蛇口が解放されると、第2給湯用混合弁23で貯湯タンク7上部の高温水と貯湯タンク7中部の中温水とが混合される。貯湯タンク7上部の高温水は、温水導出口7e、一般給湯配管19、第1給湯用混合弁21を経由し、第2給湯用混合弁23のaポートに供給される。貯湯タンク7中部の中温水は、中温導出口7fから中温配管47を経由し第2給湯用混合弁23のbポートに供給される。   In the general hot water supply operation by the hot water supply mode A, when the a port of the first hot water supply mixing valve 21 is fully closed and the faucet of the hot water supply terminal is released, the hot water in the upper part of the hot water storage tank 7 is Middle hot water in the middle of the hot water storage tank 7 is mixed. The hot water in the upper part of the hot water storage tank 7 is supplied to the a port of the second hot water mixing valve 23 via the hot water outlet 7e, the general hot water supply pipe 19, and the first hot water mixing valve 21. The intermediate temperature water in the middle of the hot water storage tank 7 is supplied from the intermediate temperature outlet 7f to the b port of the second hot water supply mixing valve 23 via the intermediate temperature piping 47.

第2給湯用混合弁23は、給湯用温度センサ48で検出した温度に基づいて、給湯端末の湯水の温度が設定温度を満足するように高温水と中温水とを混合する。第2給湯用混合弁23で混合された湯水は、第1給湯配管24を経由して、給湯栓34から給湯端末へと供給される。給湯端末から給湯されると、温水導出口7eおよび中温導出口7fから導出された湯水と同量の低温水が、水道等の水源から貯湯タンク7下部に供給され、貯湯タンク7は常に湯水で満たされた状態が維持される。低温水は、第1給水配管8a、減圧弁31、第3給水配管8cを経由して、水導入口7aより貯湯タンク7に供給される。   Based on the temperature detected by the hot water supply temperature sensor 48, the second hot water supply mixing valve 23 mixes the high temperature water and the medium temperature water so that the temperature of the hot water at the hot water supply terminal satisfies the set temperature. Hot water mixed in the second hot water supply mixing valve 23 is supplied from the hot water tap 34 to the hot water supply terminal via the first hot water supply pipe 24. When hot water is supplied from the hot water supply terminal, the same amount of low temperature water as the hot water led out from the hot water outlet 7e and the intermediate temperature outlet 7f is supplied to the lower part of the hot water storage tank 7 from a water source such as a water supply, and the hot water storage tank 7 is always hot water. The filled state is maintained. The low temperature water is supplied to the hot water storage tank 7 from the water inlet 7a via the first water supply pipe 8a, the pressure reducing valve 31, and the third water supply pipe 8c.

[給湯様式Bによる一般給湯運転]
図6は、本発明の実施の形態1に係る貯湯式給湯機で給湯様式Bによる一般給湯運転を行う場合の動作を説明するための構成図である。図6に示す貯湯式ヒートポンプ給湯機35の給湯様式Bによる一般給湯運転では、第2給湯用混合弁23のbポートを全閉状態で保持し、中温導出口7fから中温配管47を経由し第2給湯用混合弁23に向かう流路を遮断している。
[General hot water supply operation by hot water supply style B]
FIG. 6 is a configuration diagram for explaining the operation in the case of performing a general hot water supply operation in hot water supply mode B with the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. In the general hot water supply operation by the hot water supply mode B of the hot water storage type heat pump water heater 35 shown in FIG. 6, the b port of the second hot water supply mixing valve 23 is held in a fully closed state, and the second port is passed through the intermediate temperature piping 47 from the intermediate temperature outlet 7f. The flow path toward the hot water mixing valve 23 is blocked.

給湯様式Bによる一般給湯運転では、第2給湯用混合弁23のbポートが全閉状態で給湯端末の蛇口が解放されると、第1給湯用混合弁21で貯湯タンク7上部の高温水と水道等の水源から供給される低温水とが混合される。貯湯タンク7上部の高温水は、温水導出口7e、一般給湯配管19を経由し、第1給湯用混合弁21のbポートに供給される。低温水は、第1給水配管8a、減圧弁31、第2給水配管8bを経由し、第1給湯用混合弁21のaポートに供給される。第1給湯用混合弁21は、給湯用温度センサ48で検出した温度に基づいて、給湯端末の湯水の温度が設定温度を満足するように高温水と低温水とを混合する。第1給湯用混合弁21で混合された湯水は、第2給湯用混合弁23へと供給される。   In the general hot water supply operation by the hot water supply style B, when the b port of the second hot water supply mixing valve 23 is fully closed and the faucet of the hot water supply terminal is released, the first hot water supply mixing valve 21 Low temperature water supplied from a water source such as water is mixed. The hot water in the upper part of the hot water storage tank 7 is supplied to the b port of the first hot water mixing valve 21 via the hot water outlet 7e and the general hot water supply pipe 19. The low temperature water is supplied to the a port of the first hot water supply mixing valve 21 via the first water supply pipe 8a, the pressure reducing valve 31, and the second water supply pipe 8b. The first hot water supply mixing valve 21 mixes the hot water and the low temperature water so that the temperature of the hot water at the hot water supply terminal satisfies the set temperature based on the temperature detected by the hot water temperature sensor 48. The hot water mixed by the first hot water supply mixing valve 21 is supplied to the second hot water supply mixing valve 23.

第2給湯用混合弁23では、bポートからの中温水の流入は無いため、給湯用温度センサ48で検出される温度と第1給湯用混合弁21のcポートの湯水の温度とが一致する。したがって、第1給湯用混合弁21で混合された湯水は、第2給湯用混合弁23および第1給湯配管24を経由して、給湯栓34から給湯端末へと供給される。給湯端末から給湯されると、温水導出口7eおよび中温導出口7fから導出された湯水と同量の低温水が、貯湯タンク7下部に水道等の水源から供給され、貯湯タンク7は常に湯水で満たされた状態が維持される。低温水は、第1給水配管8a、減圧弁31、第3給水配管8cを経由して、水導入口7aより貯湯タンク7に供給される。   In the second hot water supply mixing valve 23, there is no inflow of intermediate temperature water from the b port, so the temperature detected by the hot water supply temperature sensor 48 matches the temperature of the hot water in the c port of the first hot water supply mixing valve 21. . Accordingly, the hot water mixed by the first hot water supply mixing valve 21 is supplied from the hot water tap 34 to the hot water supply terminal via the second hot water supply mixing valve 23 and the first hot water supply pipe 24. When hot water is supplied from the hot water supply terminal, the same amount of low temperature water as the hot water led out from the hot water outlet 7e and the intermediate temperature outlet 7f is supplied to the lower part of the hot water tank 7 from a water source such as a tap water, and the hot water tank 7 is always hot water. The filled state is maintained. The low temperature water is supplied to the hot water storage tank 7 from the water inlet 7a via the first water supply pipe 8a, the pressure reducing valve 31, and the third water supply pipe 8c.

貯湯タンク7は、温水導入出口7dからHPユニット6で加熱した高温水が供給され、水導入口7aより水道等の水源から供給される低温水が供給される。このため、貯湯タンク7の内部は、上部側ほど湯水の温度が高くなり、下部側ほど湯水の温度が低くなる温度成層が形成される。   The hot water storage tank 7 is supplied with hot water heated by the HP unit 6 from the hot water introduction outlet 7d, and is supplied with low temperature water supplied from a water source such as tap water from the water introduction port 7a. For this reason, in the hot water storage tank 7, a temperature stratification is formed in which the temperature of the hot water is higher at the upper side and the temperature of the hot water is lower at the lower side.

<給湯待機状態>
次に、本実施の形態1に係る貯湯式ヒートポンプ給湯機35での給湯待機状態について説明する。貯湯式ヒートポンプ給湯機35では、給湯端末に湯水を供給していない場合でも、給湯開始時に給湯する湯水の温度が早く設定温度に至るよう応答性を向上させるため、および停電時において湯水を確保するため、第1給湯用混合弁21、ふろ用混合弁22、第2給湯用混合弁23に対してフィードフォワード制御により適当な開度を与えている。給湯端末に湯水を供給していない状態を給湯待機状態と呼び、この状態における第1給湯用混合弁21、ふろ用混合弁22、第2給湯用混合弁23の開度を起動開度と呼ぶ。給湯待機状態においても、設定温度に比べ中温水の温度が低い時、第1給湯用混合弁21のaポートを全閉にして、第2給湯用混合弁23を起動開度にしておくことで、給湯様式Aの給湯待機状態となり、設定温度に比べ中温水の温度が高い時、第1給湯用混合弁21を起動開度にし、第2給湯用混合弁23のbポートを全閉にしておくことで、給湯様式Bの給湯待機状態となる。
<Hot water supply standby state>
Next, a hot water supply standby state in the hot water storage type heat pump water heater 35 according to the first embodiment will be described. In the hot water storage type heat pump water heater 35, even when hot water is not supplied to the hot water supply terminal, in order to improve the responsiveness so that the temperature of the hot water supplied at the start of hot water supply reaches the set temperature quickly, and to ensure hot water during a power failure Therefore, an appropriate opening degree is given to the first hot water mixing valve 21, the bath mixing valve 22, and the second hot water mixing valve 23 by feedforward control. A state in which hot water is not supplied to the hot water supply terminal is referred to as a hot water supply standby state, and the opening degrees of the first hot water mixing valve 21, the bath mixing valve 22, and the second hot water mixing valve 23 in this state are referred to as starting opening degrees. . Even in the hot water supply standby state, when the temperature of the intermediate temperature water is lower than the set temperature, the a port of the first hot water supply mixing valve 21 is fully closed, and the second hot water supply mixing valve 23 is kept at the starting opening degree. When the hot water supply mode A is in a hot water supply standby state and the temperature of the medium-temperature water is higher than the set temperature, the first hot water supply mixing valve 21 is set to the opening degree and the b port of the second hot water supply mixing valve 23 is fully closed. By putting it, it will be in the hot water supply standby state of the hot water supply style B.

<沸き上げ・一般給湯の同時運転>
次に、本実施の形態1に係る貯湯式ヒートポンプ給湯機35で沸き上げ運転と一般給湯運転とを同時に行う場合について説明する。図7は、本発明の実施の形態1に係る貯湯式給湯機で沸き上げ・一般給湯の同時運転を行う場合の動作を説明するための構成図である。なお、図7に示す沸き上げ・一般給湯の同時運転では、図3に示す沸き上げ運転と同様に三方弁10の経路を経路acに保持し、四方弁17の経路を経路cdに保持する。また、図7に示す沸き上げ・一般給湯の同時運転では、給湯様式Aによる一般給湯運転を行うので、第1給湯用混合弁21のaポートが全閉状態で給湯端末の蛇口が解放されると、第2給湯用混合弁23で貯湯タンク7上部の高温水と貯湯タンク7中部の中温水とが混合される。
<Simultaneous operation of boiling and general hot water supply>
Next, the case where the boiling operation and the general hot water supply operation are simultaneously performed in the hot water storage type heat pump water heater 35 according to the first embodiment will be described. FIG. 7 is a configuration diagram for explaining an operation in the case where simultaneous operation of boiling and general hot water supply is performed in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. In the simultaneous operation of boiling and general hot water supply shown in FIG. 7, the path of the three-way valve 10 is held in the path ac and the path of the four-way valve 17 is held in the path cd as in the boiling operation shown in FIG. In the simultaneous operation of boiling and general hot water supply shown in FIG. 7, since the general hot water supply operation by hot water supply mode A is performed, the faucet of the hot water supply terminal is released when the a port of the first hot water supply mixing valve 21 is fully closed. Then, the high temperature water in the upper part of the hot water storage tank 7 and the middle temperature water in the middle of the hot water storage tank 7 are mixed by the second hot water supply mixing valve 23.

図8は、本発明の実施の形態1に係る貯湯式給湯機で沸き上げ・一般給湯の同時運転を行う場合の別の動作を説明するための構成図である。なお、図8に示す沸き上げ・一般給湯の同時運転では、図3に示す沸き上げ運転と同様に三方弁10の経路を経路acに保持し、四方弁17の経路を経路cdに保持する。また、図8に示す沸き上げ・一般給湯の同時運転では、給湯様式Bによる一般給湯運転を行うので、第2給湯用混合弁23のbポートが全閉状態で給湯端末の蛇口が解放されると、第1給湯用混合弁21で貯湯タンク7上部の高温水と水道等の水源から供給される低温水とが混合される。   FIG. 8 is a configuration diagram for explaining another operation when simultaneous operation of boiling and general hot water supply is performed in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. In the simultaneous operation of boiling and general hot water supply shown in FIG. 8, the path of the three-way valve 10 is held in the path ac and the path of the four-way valve 17 is held in the path cd as in the boiling operation shown in FIG. Further, in the simultaneous operation of boiling and general hot water supply shown in FIG. 8, the general hot water supply operation by the hot water supply mode B is performed, so that the faucet of the hot water supply terminal is released when the b port of the second hot water supply mixing valve 23 is fully closed. Then, the first hot water mixing valve 21 mixes the hot water in the upper part of the hot water storage tank 7 with the low temperature water supplied from a water source such as a water supply.

<給湯する湯水の温度を安定化させる運転制御>
上述したように、本実施の形態1に係る貯湯式ヒートポンプ給湯機35では、一般給湯に中温水を利用するため、一般給湯運転を行う場合に給湯様式Aと給湯様式Bとの2つの運転様式を切替えることが可能である。運転様式の切替えは、図4で説明したように、ユーザがリモコン43で設定した設定温度と中温水の温度との関係により行う。つまり、運転様式の切替えは、貯湯タンク7の湯水の温度変化により判断される。例えば、貯湯式ヒートポンプ給湯機35は、設定温度に比べ中温水の温度が高い時、給湯様式Bによる一般給湯運転を実施する。しかし、貯湯式ヒートポンプ給湯機35は、給湯により貯湯タンク7内の高温水が減少すると、中温水の温度が低下するので、設定温度に比べ中温水の温度が低くなり給湯様式Aによる一般給湯運転に切替えることが可能になる。
<Operation control to stabilize the temperature of hot water to be supplied>
As described above, in the hot water storage type heat pump water heater 35 according to the first embodiment, since medium-temperature water is used for general hot water supply, two operation modes of hot water supply mode A and hot water supply mode B are performed when performing a general hot water supply operation. Can be switched. As described with reference to FIG. 4, the operation mode is switched based on the relationship between the set temperature set by the user with the remote controller 43 and the temperature of the medium-temperature water. That is, the switching of the operation mode is determined by the temperature change of the hot water in the hot water storage tank 7. For example, the hot water storage type heat pump water heater 35 performs the general hot water supply operation by the hot water supply mode B when the temperature of the medium temperature water is higher than the set temperature. However, in the hot water storage type heat pump water heater 35, when the hot water in the hot water storage tank 7 decreases due to hot water supply, the temperature of the intermediate hot water decreases, so the temperature of the intermediate hot water becomes lower than the set temperature, and the general hot water supply operation by the hot water supply mode A It becomes possible to switch to.

また、貯湯式ヒートポンプ給湯機35は、設定温度に比べ中温水の温度が低い時、給湯様式Aによる一般給湯運転を実施する。しかし、貯湯式ヒートポンプ給湯機35は、沸き上げ運転により貯湯タンク7内の高温水が増加すると、中温水の温度が上昇するので、設定温度に比べ中温水の温度が高くなり給湯様式Bによる一般給湯運転に切替えることが必要となる。逆に、貯湯式ヒートポンプ給湯機35は、給湯様式Bによる一般給湯運転に切替えない場合、設定温度に比べて高い中温水と高温水とを混合したのでは、設定温度の湯水を給湯することができなくなる。従来の貯湯式ヒートポンプ給湯機では、一般給湯運転において、貯湯タンクの湯水の温度変化により2つの運転様式を切替えた場合に、給湯端末から給湯する湯水の温度が不安定化することがあった。そこで、本実施の形態1に係る貯湯式ヒートポンプ給湯機35では、運転様式の切替えを制限することで、給湯端末から給湯する湯水の温度を安定化させている。以下、具体的に給湯する湯水の温度を安定化させる運転制御について説明する。   Moreover, the hot water storage type heat pump water heater 35 performs the general hot water supply operation by the hot water supply mode A when the temperature of the medium temperature water is lower than the set temperature. However, in the hot water storage type heat pump water heater 35, when the hot water in the hot water storage tank 7 is increased by the boiling operation, the temperature of the medium temperature water rises, so that the temperature of the medium temperature water becomes higher than the set temperature, and the general hot water supply type B is used. It is necessary to switch to hot water supply operation. On the other hand, when the hot water storage type heat pump water heater 35 is not switched to the general hot water supply operation by the hot water supply mode B, hot water at the set temperature can be supplied by mixing hot water with medium hot water higher than the set temperature. become unable. In the conventional hot water storage type heat pump water heater, when the two operation modes are switched by the temperature change of the hot water in the hot water storage tank in the general hot water supply operation, the temperature of the hot water supplied from the hot water supply terminal may become unstable. Therefore, in the hot water storage type heat pump water heater 35 according to the first embodiment, the temperature of hot water supplied from the hot water supply terminal is stabilized by restricting switching of the operation mode. Hereinafter, the operation control for stabilizing the temperature of hot water to be supplied will be described in detail.

[給湯中の運転様式の切替禁止]
本実施の形態1に係る貯湯式ヒートポンプ給湯機35では、給湯端末に供給する湯水の温度を安定化させる運転制御の一つとして、給湯中の運転様式の切替えを禁止する。給湯様式Bは、中温水の温度が設定温度以上の時に実施される。しかし、給湯により貯湯タンク7内の高温水が減少すると、中温水の温度が低下して設定温度未満となることがある。この時、貯湯式ヒートポンプ給湯機35は、給湯様式Aへ運転様式を切替えることが可能となる。
[Prohibition of switching operation mode during hot water supply]
In the hot water storage type heat pump water heater 35 according to the first embodiment, switching of the operation mode during hot water supply is prohibited as one of operation controls for stabilizing the temperature of hot water supplied to the hot water supply terminal. Hot water supply mode B is performed when the temperature of the medium-temperature water is equal to or higher than the set temperature. However, when the hot water in the hot water storage tank 7 decreases due to the hot water supply, the temperature of the intermediate hot water may decrease and become lower than the set temperature. At this time, the hot water storage type heat pump water heater 35 can switch the operation mode to the hot water supply mode A.

ここで、中温水の温度は、貯湯温度センサ41、42を利用することで測定する。例えば、貯湯温度センサ41が中温導出口7fの近傍に存在する場合、貯湯温度センサ41が検出する湯温を中温水の温度とする。貯湯温度センサ41、42が中温導出口7fに対して距離がある場合、貯湯温度センサ41、42から試算される値を中温水の温度とする。   Here, the temperature of the medium temperature water is measured by using the hot water storage temperature sensors 41 and 42. For example, when the hot water storage temperature sensor 41 exists in the vicinity of the intermediate temperature outlet 7f, the hot water temperature detected by the hot water storage temperature sensor 41 is set as the temperature of the intermediate temperature water. When the hot water storage temperature sensors 41 and 42 have a distance from the intermediate temperature outlet 7f, the value calculated from the hot water storage temperature sensors 41 and 42 is set as the temperature of the intermediate temperature water.

図9は、本発明の実施の形態1に係る貯湯式給湯機での運転制御の一例を示すフローチャートである。まず、貯湯式ヒートポンプ給湯機35の制御装置36は、給湯様式Bにて、一般給湯運転を実施する(ステップS101)。なお、ステップS101を実施する段階は、給湯様式Bで実際に給湯端末から湯水を供給している状態に限られず、まだ給湯端末に湯水を供給していない状態ではあるが、給湯端末の蛇口が解放され給湯の要求があった場合に給湯様式Bを実施できる待機状態も含まれる。その後、制御装置36は、貯湯温度センサ41、42が検出した温度に基づき、給湯により変化した貯湯タンク7内の湯水の温度分布を演算する(ステップS102)。つまり、ステップS102は、貯湯タンク7内の湯水の温度変化を検出する検出ステップである。制御装置36は、ステップS102で演算した貯湯タンク7内の湯水の温度分布から中温水の温度を試算し、当該中温水の温度が設定温度以上か否かを判断する(ステップS103)。中温水の温度が設定温度以上である場合(ステップS103:YES)、制御装置36は、処理をステップS101に戻し一般給湯運転の運転様式を給湯様式Bのまま継続する。つまり、ステップS103は、給湯対象への給湯に利用する配管の切替えを行うか否かを判定する判定ステップである。   FIG. 9 is a flowchart showing an example of operation control in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. First, the control device 36 of the hot water storage type heat pump water heater 35 carries out a general hot water supply operation in the hot water supply mode B (step S101). Note that the stage of performing step S101 is not limited to the state in which hot water is actually supplied from the hot water supply terminal in the hot water supply mode B, and is a state in which hot water is not yet supplied to the hot water supply terminal. A standby state in which the hot water supply mode B can be implemented when the hot water supply is requested after being released is also included. Thereafter, the control device 36 calculates the temperature distribution of the hot water in the hot water storage tank 7 that has changed due to hot water supply, based on the temperature detected by the hot water storage temperature sensors 41 and 42 (step S102). That is, step S102 is a detection step for detecting the temperature change of the hot water in the hot water storage tank 7. The control device 36 calculates the temperature of the intermediate temperature water from the temperature distribution of the hot water in the hot water storage tank 7 calculated in step S102, and determines whether the temperature of the intermediate temperature water is equal to or higher than the set temperature (step S103). When the temperature of the intermediate temperature water is equal to or higher than the set temperature (step S103: YES), the control device 36 returns the process to step S101 and continues the operation mode of the general hot water supply operation with the hot water supply mode B being continued. That is, step S103 is a determination step for determining whether or not to switch the pipe used for hot water supply to the hot water supply target.

一方、中温水の温度が設定温度未満である場合(ステップS103:NO)、制御装置36は、給湯端末の蛇口が解放され給湯の要求があり、給湯端末から湯水を給湯中か否かを判断する(ステップS104)。給湯端末から湯水を給湯中の場合(ステップS104:YES)、制御装置36は、処理をステップS101に戻し一般給湯運転の運転様式を給湯様式Bのまま継続する。つまり、制御装置36は、中温水の温度が設定温度未満となり、給湯様式Aに運転様式を切替え可能な状態であるが、給湯端末から湯水を給湯中であるため運転様式の切替えを禁止している。ステップS104は、給湯対象への給湯中であれば配管の切替えを制限する制限ステップである。給湯端末から湯水を給湯中でない場合(ステップS104:NO)、制御装置36は、運転様式を給湯様式Aに切替える(ステップS105)。すなわち、制御装置36は、第1給湯用混合弁21のaポートを全閉とし、第2給湯用混合弁23を起動開度の状態にする。つまり、貯湯式ヒートポンプ給湯機35は、給湯に利用する配管を、給水配管8から中温配管47に切替える。なお、ステップS105を実施する段階は、まだ給湯端末に湯水を供給していない状態ではあるが、給湯端末の蛇口が解放され給湯の要求があった場合に給湯様式Aを実施できる待機状態に限られず、給湯様式Aで実際に給湯端末から湯水を供給している状態も含まれる。   On the other hand, when the temperature of the medium-temperature water is lower than the set temperature (step S103: NO), the control device 36 determines whether the hot water supply terminal is released and there is a request for hot water supply, and hot water is being supplied from the hot water supply terminal. (Step S104). When hot water is being supplied from the hot water supply terminal (step S104: YES), the control device 36 returns the process to step S101 and continues the operation mode of the general hot water supply operation as the hot water supply mode B. That is, the control device 36 is in a state in which the temperature of the medium-temperature water becomes lower than the set temperature and the operation mode can be switched to the hot water supply mode A, but since the hot water is being supplied from the hot water supply terminal, switching of the operation mode is prohibited. Yes. Step S104 is a limiting step for restricting the switching of the pipes during hot water supply to the hot water supply target. When hot water is not being supplied from the hot water supply terminal (step S104: NO), the control device 36 switches the operation mode to the hot water supply mode A (step S105). That is, the control device 36 fully closes the a port of the first hot water supply mixing valve 21 and puts the second hot water supply mixing valve 23 into the start opening state. That is, the hot water storage type heat pump water heater 35 switches the pipe used for hot water supply from the water supply pipe 8 to the medium temperature pipe 47. In addition, although the stage which implements step S105 is a state which has not yet supplied hot water to the hot water supply terminal, it is limited to the standby state in which the hot water supply style A can be performed when the faucet of the hot water supply terminal is released and there is a request for hot water supply. In addition, a state where hot water is actually supplied from the hot water supply terminal in the hot water supply mode A is also included.

このように、貯湯式ヒートポンプ給湯機35では、給湯端末から湯水を給湯中に運転様式の切替えが起こらないように禁止しているため、給湯端末から湯水を給湯中に湯水の温度が突然変化することを回避できる。   As described above, in the hot water storage type heat pump water heater 35, since the operation mode is not changed during hot water supply from the hot water supply terminal, the temperature of the hot water suddenly changes while hot water is supplied from the hot water supply terminal. You can avoid that.

[給湯中の沸き上げ運転の制限]
次に、制御装置36が、一般給湯運転の運転様式を給湯様式Aに切替え、運転を実施している場合について説明する。給湯様式Aは、中温水の温度が設定温度未満の時に実施される。しかし、沸き上げ運転により貯湯タンク7内の高温水が増加すると、中温水の温度が上昇して設定温度以上となることがある。この時、貯湯式ヒートポンプ給湯機35は、給湯様式Bへ運転様式を切替えることが必要となる。逆に、貯湯式ヒートポンプ給湯機35は、給湯様式Bによる一般給湯運転に切替えない場合、設定温度に比べて高い中温水と高温水とを混合したのでは、設定温度の湯水を給湯することができなくなる。
[Restriction of boiling operation during hot water supply]
Next, the case where the control device 36 switches the operation mode of the general hot water supply operation to the hot water supply mode A and performs the operation will be described. Hot water supply mode A is performed when the temperature of the medium-temperature water is lower than the set temperature. However, if the high temperature water in the hot water storage tank 7 increases due to the boiling operation, the temperature of the medium temperature water may rise and become the set temperature or higher. At this time, the hot water storage type heat pump water heater 35 needs to switch the operation mode to the hot water supply mode B. On the other hand, when the hot water storage type heat pump water heater 35 is not switched to the general hot water supply operation by the hot water supply mode B, hot water at the set temperature can be supplied by mixing hot water with medium hot water higher than the set temperature. become unable.

図10は、本発明の実施の形態1に係る貯湯式給湯機での運転制御の別の一例を示すフローチャートである。図10に示すフローチャートは、貯湯式ヒートポンプ給湯機35が、給湯様式Aから給湯様式Bへの運転様式の切替頻度を低減させる運転制御制を実施する場合を示している。まず、貯湯式ヒートポンプ給湯機35の制御装置36は、給湯様式Aにて、一般給湯運転を実施する(ステップS201)。なお、ステップS201を実施する段階は、給湯様式Aで実際に給湯端末から湯水を供給している状態に限られず、まだ給湯端末に湯水を供給していない状態ではあるが、給湯端末の蛇口が解放され給湯の要求があった場合に給湯様式Aを実施できる待機状態も含まれる。その後、制御装置36は、沸き上げ要求の有無を確認する(ステップS202)。沸き上げ要求は、予め定められた時刻になった場合、貯湯タンク7内の蓄熱量が低下した場合、ユーザがリモコン43で沸き上げ操作を行なった場合等に出力される。沸き上げ要求がない場合(ステップS202:NO)、制御装置36は、本運転制御を終了する。   FIG. 10 is a flowchart showing another example of operation control in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. The flowchart shown in FIG. 10 shows a case where the hot water storage type heat pump water heater 35 implements an operation control system that reduces the frequency of switching the operation mode from the hot water supply mode A to the hot water supply mode B. First, the control device 36 of the hot water storage type heat pump water heater 35 performs a general hot water supply operation in the hot water supply mode A (step S201). Note that the stage of performing step S201 is not limited to the state in which hot water is actually supplied from the hot water supply terminal in the hot water supply mode A, and the state in which hot water is not yet supplied to the hot water supply terminal, A standby state in which the hot water supply mode A can be implemented when the hot water supply is requested after being released is also included. Thereafter, the control device 36 confirms whether or not there is a boiling request (step S202). The boiling request is output when a predetermined time comes, when the amount of heat stored in the hot water storage tank 7 decreases, or when the user performs a boiling operation with the remote controller 43. When there is no boiling-up request (step S202: NO), the control device 36 ends the present operation control.

一方、沸き上げ要求がある場合(ステップS202:YES)、制御装置36は、給湯端末の蛇口が解放され給湯の要求があり、給湯端末から湯水を給湯中か否かを判断する(ステップS203)。給湯端末から湯水を給湯中でない場合(ステップS203:NO)、制御装置36は、要求があった沸き上げ運転を実施する(ステップS204)。給湯端末から湯水を給湯中である場合(ステップS203:YES)、制御装置36は、貯湯タンク7内の中温水の温度と設定温度との温度差がT1以上か否かを判断する(ステップS205)。ここで、温度差T1は、要求に応じて沸き上げ運転を行った場合でも貯湯タンク7内の中温水の温度が設定温度を超えない程度の温度差であり、貯湯タンク7の容量や沸き上げ運転の時間により異なるが例えば10℃程度である。中温水の温度と設定温度との温度差がT1以上である場合(ステップS205:YES)、制御装置36は、要求があった沸き上げ運転を実施する(ステップS206)。制御装置36は、ステップS206で沸き上げ運転を実施後に処理をステップS202に戻す。   On the other hand, when there is a boiling-up request (step S202: YES), the control device 36 determines whether the faucet of the hot water supply terminal is released and there is a request for hot water supply, and hot water is being supplied from the hot water supply terminal (step S203). . When hot water is not being supplied from the hot water supply terminal (step S203: NO), the control device 36 performs the requested boiling operation (step S204). When hot water is being supplied from the hot water supply terminal (step S203: YES), the controller 36 determines whether or not the temperature difference between the temperature of the medium temperature water in the hot water storage tank 7 and the set temperature is equal to or greater than T1 (step S205). ). Here, the temperature difference T1 is a temperature difference such that the temperature of the medium temperature water in the hot water storage tank 7 does not exceed the set temperature even when the boiling operation is performed on demand. For example, it is about 10 ° C. although it varies depending on the operation time. When the temperature difference between the temperature of the intermediate temperature water and the set temperature is equal to or greater than T1 (step S205: YES), the control device 36 performs the requested boiling operation (step S206). The control apparatus 36 returns a process to step S202 after implementing boiling operation by step S206.

中温水の温度と設定温度との温度差がT1未満である場合(ステップS205:NO)、制御装置36は、貯湯タンク7内の中温水の温度と設定温度との温度差がT2以上か否かを判断する(ステップS207)。ここで、温度差T2は、要求に応じて通常の沸き上げ運転を行った場合中温水の温度が設定温度を超えてしまうが、HPユニット6での加熱を制限(例えば、加熱能力、熱源ポンプ11でHPユニット6へ供給する湯水の量などを制限)すれば中温水の温度が設定温度を超えない程度の温度差であり、貯湯タンク7の容量や沸き上げ運転の時間により異なるが例えば5℃程度である。また、温度差T1は、温度差T2より大きい。中温水の温度と設定温度との温度差がT2以上である場合(ステップS207:YES)、制御装置36は、HPユニット6の加熱能力を低下させるように動作を制限するか、あるいは、沸き上げを行う湯水の量を抑えるため熱源ポンプ11の回転数を低下させるように動作を制限して沸き上げ運転を実施する(ステップS208)。制御装置36は、ステップS208で制限された沸き上げ運転を実施後に処理をステップS202に戻す。   When the temperature difference between the temperature of the intermediate temperature water and the set temperature is less than T1 (step S205: NO), the control device 36 determines whether the temperature difference between the temperature of the intermediate temperature water in the hot water storage tank 7 and the set temperature is equal to or greater than T2. Is determined (step S207). Here, the temperature difference T2 indicates that the temperature of the medium-temperature water exceeds the set temperature when a normal boiling operation is performed as required, but the heating in the HP unit 6 is limited (for example, heating capacity, heat source pump) 11, the amount of hot water supplied to the HP unit 6 is limited). The temperature difference is such that the temperature of the medium-temperature water does not exceed the set temperature, and varies depending on the capacity of the hot water storage tank 7 and the heating operation time. It is about ℃. Further, the temperature difference T1 is larger than the temperature difference T2. When the temperature difference between the temperature of the medium temperature water and the set temperature is equal to or greater than T2 (step S207: YES), the control device 36 restricts the operation so as to reduce the heating capability of the HP unit 6 or raises the temperature. In order to suppress the amount of hot and cold water to be performed, the operation is limited so as to reduce the rotational speed of the heat source pump 11, and the boiling operation is performed (step S208). The control device 36 returns the process to step S202 after performing the boiling operation limited in step S208.

中温水の温度と設定温度との温度差がT2未満である場合(ステップS207:NO)、制御装置36は、沸き上げ運転が既に開始している(沸き上げ運転中)か否かを判断する(ステップS209)。沸き上げ運転が既に開始している場合(ステップS209:YES)、制御装置36は、沸き上げ運転を停止する。例えば、制御装置36は、中温水の温度と設定温度との温度差がT1以上でステップS206において沸き上げ運転を開始したが、その後中温水の温度が上昇して、中温水の温度と設定温度との温度差がT2未満となった場合、給湯様式Aの運転様式を維持することができなくなることを回避するために沸き上げ運転を停止する(ステップS210)。制御装置36は、沸き上げ運転を停止することで、さらなる中温水の温度の上昇を抑えることができるため、給湯様式Aの運転様式を維持することができる。制御装置36は、ステップS210で沸き上げ運転を停止後に処理をステップS202に戻す。また、沸き上げ運転が既に開始していない場合(ステップS209:NO)、制御装置36は、処理をステップS202に戻し、沸き上げ要求が継続中か否かを判断する。   When the temperature difference between the temperature of the medium temperature water and the set temperature is less than T2 (step S207: NO), the control device 36 determines whether or not the boiling operation has already started (during the boiling operation). (Step S209). When the boiling operation has already started (step S209: YES), the control device 36 stops the boiling operation. For example, the control device 36 starts the boiling operation in step S206 when the temperature difference between the temperature of the medium-temperature water and the set temperature is equal to or greater than T1, but then the temperature of the medium-temperature water rises, and the temperature of the medium-temperature water and the set temperature When the temperature difference between and becomes less than T2, the boiling operation is stopped to avoid that the operation mode of the hot water supply mode A cannot be maintained (step S210). Since the controller 36 can suppress the further increase in the temperature of the medium-temperature water by stopping the boiling operation, the operation mode of the hot water supply mode A can be maintained. The control device 36 returns the process to step S202 after stopping the boiling operation in step S210. When the boiling operation has not been started (step S209: NO), the control device 36 returns the process to step S202, and determines whether or not the boiling request is continuing.

以上のように、説明のように本実施の形態1に係る貯湯式ヒートポンプ給湯機35では、給湯様式Aで給湯端末から湯水を給湯中に中温水の温度が設定温度以上とならないように、貯湯タンク7の湯水の加熱を制限することで、運転様式を給湯様式Bに切替える必要性を回避している。そのため、本実施の形態1に係る貯湯式ヒートポンプ給湯機35では、給湯に利用する配管を、中温配管47から給水配管8に切替えることによって給湯端末に供給する湯水の温度が不安定化することを回避できる。   As described above, in the hot water storage type heat pump water heater 35 according to the first embodiment as described above, hot water storage is performed so that the temperature of the medium temperature water does not exceed the set temperature during hot water supply from the hot water supply terminal in the hot water supply mode A. Limiting the heating of the hot water in the tank 7 avoids the need to switch the operation mode to the hot water supply mode B. Therefore, in the hot water storage type heat pump water heater 35 according to the first embodiment, the temperature of the hot water supplied to the hot water supply terminal is destabilized by switching the pipe used for hot water supply from the intermediate temperature pipe 47 to the water supply pipe 8. Can be avoided.

<給湯中の運転様式の切替>
上記で説明した運転制御では、給湯端末から湯水を給湯中に運転様式の切替えを禁止することで、給湯端末に供給する湯水の温度を安定化させている。しかし、貯湯タンク7内の蓄熱量が小さく、給湯時に沸き上げ運転の中止や制限した沸き上げ運転が困難な場合、給湯様式Aと給湯様式Bとの2つの運転様式を切替える必要がある。給湯端末から湯水を給湯中に運転様式の切替えを禁止できない場面において、混合弁を開閉する動作を制御することで、給湯様式Aと給湯様式Bとの2つの運転様式を切替え時に、給湯端末に供給する湯水の温度を安定化させる運転制御について説明する。
<Switching operation mode during hot water supply>
In the operation control described above, the temperature of hot water supplied to the hot water supply terminal is stabilized by prohibiting switching of the operation mode while hot water is supplied from the hot water supply terminal. However, when the amount of heat stored in the hot water storage tank 7 is small and it is difficult to stop the boiling operation or restrict the boiling operation during hot water supply, it is necessary to switch between the two hot water supply modes A and B. By switching the operation of opening and closing the mixing valve in scenes where switching of operation modes during hot water supply from the hot water supply terminal cannot be prohibited, the two hot water supply modes A and B are switched to the hot water supply terminal when switching between the two operation modes. The operation control for stabilizing the temperature of the supplied hot water will be described.

[給湯様式Aから給湯様式Bへの切替えについて]
図11は、本発明の実施の形態1に係る貯湯式給湯機で給湯様式Aから給湯様式Bへ切替える際の、混合弁の開閉、給湯端末に供給する湯水の温度の時間変化を説明するための図である。図11には、第1給湯用混合弁21のaポートの開閉状態、第2給湯用混合弁23のbポートの開閉状態、および給湯用温度センサ48の検出温度の時間変化が図示されている。まず、貯湯式ヒートポンプ給湯機35は、時刻0〜時刻t1の間を給湯様式Aで運転を実施している場合、第1給湯用混合弁21のaポートは全閉となる。時刻t1に運転様式を給湯様式Aから給湯様式Bに運転を切替える場合、貯湯式ヒートポンプ給湯機35は、第2給湯用混合弁23のbポートを全閉すべく、一定速度で開度を変更する。さらに、貯湯式ヒートポンプ給湯機35は、給湯用温度センサ48の検出温度が設定温度を満足するように、第1給湯用混合弁21のaポートの開度を調整する。つまり、貯湯式ヒートポンプ給湯機35は、第2給湯用混合弁23のbポートの開度を一定速度で変更することにより、第2給湯用混合弁23による給湯温度への影響を単純化して、第1給湯用混合弁21のaポートの開度のみで給湯温度を調整している。また、貯湯式ヒートポンプ給湯機35は、第2給湯用混合弁23のbポートにおける開度の変更速度の上限を第1給湯用混合弁21のaポートにおける開度の変更速度の上限に比べ小さくすることで、第2給湯用混合弁23のbポートの開度変更による給湯温度への影響を小さくしている。そのため、貯湯式ヒートポンプ給湯機35は、第1給湯用混合弁21のaポートの開度および第2給湯用混合弁23のbポートの開度を同時に調整する必要がないので、給湯様式Aから給湯様式Bへの切替え制御が単純化でき、給湯端末に供給する湯水の温度の安定化を図ることができる。図11からも分かるように、時刻t1後の給湯用温度センサ48の検出温度が設定温度を満足している。なお、第2給湯用混合弁23のbポートの開度の変更速度は、例えば、製品出荷前に予め記憶部52に記憶してある。もちろん、制御が複雑化するが貯湯式ヒートポンプ給湯機35は、第2給湯用混合弁23のbポートの開度を一定速度で変更せずに、第1給湯用混合弁21のaポートの開度および第2給湯用混合弁23のbポートの開度を同時に調整してもよい。
[About switching from hot water supply style A to hot water supply style B]
FIG. 11 is a diagram for explaining temporal changes in the temperature of the hot water supplied to the open / close of the mixing valve and the hot water supply terminal when switching from the hot water supply mode A to the hot water supply mode B in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. FIG. FIG. 11 shows the time variation of the open / close state of the a port of the first hot water supply mixing valve 21, the open / close state of the b port of the second hot water supply mixing valve 23, and the detected temperature of the hot water temperature sensor 48. . First, when the hot water storage type heat pump water heater 35 is operating in the hot water supply mode A between time 0 and time t1, the a port of the first hot water mixing valve 21 is fully closed. When the operation mode is switched from the hot water supply mode A to the hot water supply mode B at the time t1, the hot water storage heat pump water heater 35 changes the opening degree at a constant speed so as to fully close the b port of the second hot water mixing valve 23. . Further, the hot water storage type heat pump water heater 35 adjusts the opening degree of the a port of the first hot water mixing valve 21 so that the temperature detected by the hot water temperature sensor 48 satisfies the set temperature. That is, the hot water storage type heat pump water heater 35 simplifies the influence of the second hot water mixing valve 23 on the hot water temperature by changing the opening of the b port of the second hot water mixing valve 23 at a constant speed. The hot water supply temperature is adjusted only by the opening degree of the a port of the first hot water supply mixing valve 21. The hot water storage type heat pump water heater 35 has a lower upper limit of the opening change rate at the b port of the second hot water mixing valve 23 than an upper limit of the opening change rate at the a port of the first hot water mixing valve 21. By doing so, the influence on the hot water supply temperature by changing the opening degree of the b port of the second hot water supply mixing valve 23 is reduced. Therefore, the hot water storage type heat pump water heater 35 does not need to adjust the opening degree of the a port of the first hot water supply mixing valve 21 and the opening degree of the b port of the second hot water mixing valve 23 at the same time. Switching control to the hot water supply mode B can be simplified, and the temperature of the hot water supplied to the hot water supply terminal can be stabilized. As can be seen from FIG. 11, the temperature detected by the hot water supply temperature sensor 48 after the time t1 satisfies the set temperature. In addition, the change speed of the opening degree of b port of the 2nd hot water supply mixing valve 23 is memorize | stored in the memory | storage part 52 beforehand, for example before product shipment. Of course, although the control is complicated, the hot water storage type heat pump water heater 35 opens the a port of the first hot water mixing valve 21 without changing the opening degree of the b port of the second hot water mixing valve 23 at a constant speed. And the opening degree of the b port of the second hot water supply mixing valve 23 may be adjusted simultaneously.

[給湯様式Bから給湯様式Aへの切替えについて]
図12は、本発明の実施の形態1に係る貯湯式給湯機で給湯様式Bから給湯様式Aへ切替える際の、混合弁の開閉、給湯端末に供給する湯水の温度の時間変化を説明するための図である。図12には、第1給湯用混合弁21のaポートの開閉状態、第2給湯用混合弁23のbポートの開閉状態、および給湯用温度センサ48の検出温度の時間変化が図示されている。なお、貯湯式ヒートポンプ給湯機35は、一般給湯運転の運転様式を給湯様式Bから給湯様式Aに切替えなくても、給湯端末に供給する湯水の温度が設定温度を満足しないという状態は生じないが、当該切替えにより、一度給湯の終了を待つことなく中温水の利用する給湯が可能となるため、より運転効率を高めることができる。まず、貯湯式ヒートポンプ給湯機35は、時刻0〜時刻t2の間を給湯様式Bで運転を実施している場合、第2給湯用混合弁23のbポートは全閉となる。時刻t2に運転様式を給湯様式Bから給湯様式Aに運転を切替える場合、貯湯式ヒートポンプ給湯機35は、第1給湯用混合弁21のaポートを全閉すべく、一定速度で開度を変更する。さらに、貯湯式ヒートポンプ給湯機35は、給湯用温度センサ48の検出温度が設定温度を満足するように、第2給湯用混合弁23のbポートの開度を調整する。つまり、貯湯式ヒートポンプ給湯機35は、第1給湯用混合弁21の開度を一定速度で変更することにより、第1給湯用混合弁21による給湯温度への影響を単純化して、第2給湯用混合弁23のbポートの開度のみで給湯温度を調整している。また、貯湯式ヒートポンプ給湯機35は、第1給湯用混合弁21のaポートにおける開度の変更速度の上限を第2給湯用混合弁23のbポートにおける開度の変更速度の上限に比べ小さくすることで、第1給湯用混合弁21のaポートの開度変更により給湯温度への影響を小さくしている。そのため、貯湯式ヒートポンプ給湯機35は、第1給湯用混合弁21のaポートの開度および第2給湯用混合弁23のbポートの開度を同時に調整する必要がないので、給湯様式Bから給湯様式Aへの切替え制御を単純化でき、給湯端末に供給する湯水の温度の安定化を図ることができる。図12からも分かるように、時刻t2後の給湯用温度センサ48の検出温度が設定温度を満足している。なお、第1給湯用混合弁21のaポートの開度の変更速度は、例えば、製品出荷前に予め記憶部52に記憶してある。もちろん、制御が複雑化するが貯湯式ヒートポンプ給湯機35は、第1給湯用混合弁21のaポートの開度を一定速度で変更せずに、第1給湯用混合弁21のaポートの開度および第2給湯用混合弁23のbポートの開度を同時に調整してもよい。
[About switching from hot water supply style B to hot water supply style A]
FIG. 12 is a view for explaining temporal changes in the temperature of hot water supplied to the open / close of the mixing valve and the hot water supply terminal when switching from the hot water supply mode B to the hot water supply mode A in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. FIG. FIG. 12 shows the time variation of the open / close state of the a port of the first hot water supply mixing valve 21, the open / close state of the b port of the second hot water supply mixing valve 23, and the detected temperature of the hot water temperature sensor 48. . The hot water storage type heat pump water heater 35 does not cause a state in which the temperature of the hot water supplied to the hot water supply terminal does not satisfy the set temperature even if the operation mode of the general hot water supply operation is not switched from the hot water supply mode B to the hot water supply mode A. By this switching, it becomes possible to supply hot water using medium-temperature water without waiting for the end of hot water supply once, so that the operation efficiency can be further improved. First, when the hot water storage type heat pump water heater 35 is operating in the hot water supply mode B from time 0 to time t2, the b port of the second hot water supply mixing valve 23 is fully closed. When the operation mode is switched from the hot water supply mode B to the hot water supply mode A at time t2, the hot water storage heat pump water heater 35 changes the opening degree at a constant speed so as to fully close the a port of the first hot water mixing valve 21. . Furthermore, the hot water storage type heat pump water heater 35 adjusts the opening degree of the b port of the second hot water mixing valve 23 so that the temperature detected by the hot water temperature sensor 48 satisfies the set temperature. That is, the hot water storage type heat pump water heater 35 simplifies the influence of the first hot water mixing valve 21 on the hot water temperature by changing the opening of the first hot water mixing valve 21 at a constant speed. The hot water supply temperature is adjusted only by the opening of the b port of the mixing valve 23 for use. The hot water storage type heat pump water heater 35 has a lower upper limit of the opening change rate at the a port of the first hot water mixing valve 21 than an upper limit of the opening change rate at the b port of the second hot water mixing valve 23. Thus, the influence on the hot water supply temperature is reduced by changing the opening degree of the a port of the first hot water supply mixing valve 21. Therefore, the hot water storage type heat pump water heater 35 does not need to adjust the opening degree of the a port of the first hot water supply mixing valve 21 and the opening degree of the b port of the second hot water mixing valve 23 at the same time. Switching control to the hot water supply mode A can be simplified, and the temperature of hot water supplied to the hot water supply terminal can be stabilized. As can be seen from FIG. 12, the temperature detected by hot water temperature sensor 48 after time t2 satisfies the set temperature. The changing speed of the opening degree of the a port of the first hot water supply mixing valve 21 is stored in the storage unit 52 in advance, for example, before product shipment. Of course, although the control is complicated, the hot water storage type heat pump water heater 35 opens the a port of the first hot water mixing valve 21 without changing the opening degree of the a port of the first hot water mixing valve 21 at a constant speed. And the opening degree of the b port of the second hot water supply mixing valve 23 may be adjusted simultaneously.

以上、説明のように本実施の形態1に係る貯湯式ヒートポンプ給湯機35は、制御装置36が、貯湯温度センサ41、42で検出した貯湯タンク7内の湯水の温度変化に応じて第1給湯用混合弁21および第2給湯用混合弁23の開閉を制御して、給湯対象への給湯に利用する配管の切替えを行い、給湯対象への給湯中に、当該配管の切替えを制限するので、湯水を継続して給湯する場合に安定して設定温度の湯水を供給することができる。また、本実施の形態1に係る貯湯式ヒートポンプ給湯機35は、一般給湯運転の運転様式を切替える場合、第1給湯用混合弁21のaポートの開度および第2給湯用混合弁23のbポートの開度を図11および図12で示したように調整することで、制御を単純化でき、給湯端末に供給する湯水の温度の安定化を図ることができる。なお、本実施の形態1に係る貯湯式ヒートポンプ給湯機35では、貯湯タンク7に3つの出湯口(温水導入出口7d、温水導出口7e、中温導出口7f)を有し、それらの出湯口が3つの混合弁(第1給湯用混合弁21、ふろ用混合弁22、第2給湯用混合弁23)を利用して混合される例を示したが、これに限られず貯湯タンク7が2つ以上の出湯口を有し、混合に利用する出湯配管を切替えることが可能であればよい。   As described above, the hot water storage type heat pump water heater 35 according to the first embodiment has the first hot water supply according to the temperature change of the hot water in the hot water storage tank 7 detected by the control device 36 using the hot water storage temperature sensors 41 and 42. Because the opening and closing of the mixing valve 21 and the second hot water supply mixing valve 23 are controlled to switch the piping used for hot water supply to the hot water supply target, and the switching of the piping is limited during the hot water supply to the hot water supply target, When hot water is continuously supplied, hot water at a set temperature can be stably supplied. Further, in the hot water storage heat pump water heater 35 according to the first embodiment, when the operation mode of the general hot water supply operation is switched, the opening degree of the a port of the first hot water supply mixing valve 21 and b of the second hot water supply mixing valve 23 are changed. By adjusting the opening of the port as shown in FIGS. 11 and 12, the control can be simplified and the temperature of the hot water supplied to the hot water supply terminal can be stabilized. In the hot water storage type heat pump water heater 35 according to the first embodiment, the hot water storage tank 7 has three hot water outlets (a hot water introduction outlet 7d, a hot water outlet 7e, and a medium temperature outlet 7f), and these hot water outlets Although the example mixed using three mixing valves (The 1st hot water supply mixing valve 21, the bath mixing valve 22, and the 2nd hot water mixing valve 23) was shown, it is not restricted to this but two hot water storage tanks 7 are provided. What is necessary is just to have the above hot water outlet and to be able to switch the hot water piping used for mixing.

また、制御装置36で配管の切替えを制限する動作には、例えば第1給湯用混合弁21、第2給湯用混合弁23を開閉する動作や、貯湯タンク7内より、複数の出湯配管(例えば、一般給湯配管19、中温配管47など)に含まれる特定の出湯配管が取り出す湯水の温度上昇を抑える動作等が含まれる。第1給湯用混合弁21、第2給湯用混合弁23を開閉する動作には、例えば上述した給湯様式Bから給湯様式Aへの切替え制御に対応し、中温配管47から供給される中温水の温度が設定温度より低くなっても、中温配管47から供給される中温水を給湯に利用する配管に切替えるため第1給湯用混合弁21のaポートを全閉し、第2給湯用混合弁23のbポートの開度を変更する動作を制限することが含まれる。   Further, the operation of restricting the switching of the piping by the control device 36 includes, for example, an operation of opening and closing the first hot water mixing valve 21 and the second hot water mixing valve 23, and a plurality of hot water piping (for example, from the hot water storage tank 7). Operation of suppressing the temperature rise of the hot water taken out by a specific hot water supply pipe included in the general hot water supply pipe 19 and the intermediate temperature pipe 47). The operation of opening and closing the first hot water supply mixing valve 21 and the second hot water supply mixing valve 23 corresponds to, for example, the above-described switching control from the hot water supply mode B to the hot water supply mode A, and the medium temperature water supplied from the intermediate temperature pipe 47. Even when the temperature is lower than the set temperature, the a-port of the first hot water supply mixing valve 21 is fully closed to switch the hot water supplied from the intermediate temperature piping 47 to a pipe that uses the hot water supply, and the second hot water supply mixing valve 23 is closed. Limiting the operation of changing the opening of the b port.

さらに、制御装置36が貯湯タンク7内より、複数の出湯配管に含まれる特定の出湯配管が取り出す湯水の温度上昇を抑える動作には、HPユニット6での加熱を制限することが含まれ、例えば、HPユニット6の稼動をON・OFFで制限すること、HPユニット6の加熱能力を低下させて加熱を制限すること、熱源ポンプ11の回転数を低下させてHPユニット6に供給する湯水の量を制限して加熱を制限すること等が含まれる。また、制御装置36が制限する第1給湯用混合弁21、第2給湯用混合弁23を開閉する動作には、給湯様式Aから給湯様式Bへ配管の切替えを行う場合に、第2給湯用混合弁23のbポートの全閉動作を予め規定された速度で行い、給湯用温度センサ48の検出温度に基づき、第1給湯用混合弁21のaポートの開動作の速度を制限する動作が含まれる。制御装置36が制限する第1給湯用混合弁21、第2給湯用混合弁23を開閉する動作には、給湯様式Bから給湯様式Aへ配管の切替えを行う場合に、第1給湯用混合弁21のaポートの全閉動作を予め規定された速度で行い、給湯用温度センサ48の検出温度に基づき、第2給湯用混合弁23のbポートの開動作の速度を制限する動作が含まれる。本実施の形態1に係る貯湯式ヒートポンプ給湯機35は、一方の混合弁の全閉動作を予め規定された速度で行い、他方の混合弁の開動作の速度を給湯用温度センサ48の検出温度に基づき制御するので、全ての混合弁の出口に温度センサを設置する必要がなく、給湯用温度センサ48のみでよく、構成を簡単にすることができる。   Furthermore, the operation in which the control device 36 suppresses the temperature rise of the hot water taken out from the hot water storage tank 7 by the specific hot water piping included in the hot water piping includes limiting the heating in the HP unit 6, for example, , Limiting the operation of the HP unit 6 by ON / OFF, limiting the heating by reducing the heating capacity of the HP unit 6, reducing the number of revolutions of the heat source pump 11, and the amount of hot water supplied to the HP unit 6 Limiting the heating and the like. The operation of opening and closing the first hot water supply mixing valve 21 and the second hot water supply mixing valve 23 restricted by the control device 36 is performed when the pipe is switched from the hot water supply mode A to the hot water supply mode B. An operation of performing the fully closing operation of the b port of the mixing valve 23 at a predetermined speed and limiting the opening operation speed of the a port of the first hot water mixing valve 21 based on the temperature detected by the hot water temperature sensor 48. included. In the operation of opening and closing the first hot water supply mixing valve 21 and the second hot water supply mixing valve 23 restricted by the control device 36, when switching the piping from the hot water supply mode B to the hot water supply mode A, the first hot water supply mixing valve 21 includes the operation of performing the fully closing operation of the a port of 21 at a predetermined speed and limiting the opening operation speed of the b port of the second hot water mixing valve 23 based on the temperature detected by the hot water temperature sensor 48. . The hot water storage type heat pump water heater 35 according to the first embodiment performs the fully closing operation of one mixing valve at a predetermined speed, and the opening temperature of the other mixing valve is detected by the temperature sensor 48 for hot water supply. Therefore, it is not necessary to install temperature sensors at the outlets of all the mixing valves, and only the hot water temperature sensor 48 is required, and the configuration can be simplified.

(実施の形態2)
<装置構成>
本実施の形態1に係る貯湯式ヒートポンプ給湯機35では、図1に示すように中温配管47が第2給湯用混合弁23のbポートに接続される構成であったが、これに限られない。本実施の形態2に係る貯湯式ヒートポンプ給湯機では、中温配管が第1給湯用混合弁のbポートに接続される構成である。図13は、本発明の実施の形態2に係る貯湯式給湯機を説明するための構成図である。図13に示す貯湯式ヒートポンプ給湯機35aでは、第1給湯用混合弁21bのaポートに一般給湯配管19が接続され、第1給湯用混合弁21bのbポートに中温配管47bが接続され、第1給湯用混合弁21bのcポートに第2給湯用混合弁23bのbポートが接続されている。第2給湯用混合弁23bは、aポートに第2給水配管8bが、cポートに第1給湯配管24がそれぞれ接続されている。なお、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aにおいて、実施の形態1に係る貯湯式ヒートポンプ給湯機35と同じ構成については同じ符号を付して詳細な説明を省略する。以下、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aの運転制御について説明する。
(Embodiment 2)
<Device configuration>
In the hot water storage type heat pump water heater 35 according to the first embodiment, the intermediate temperature pipe 47 is connected to the b port of the second hot water supply mixing valve 23 as shown in FIG. 1, but is not limited thereto. . In the hot water storage type heat pump water heater according to the second embodiment, the intermediate temperature pipe is connected to the b port of the first hot water supply mixing valve. FIG. 13: is a block diagram for demonstrating the hot water storage type water heater based on Embodiment 2 of this invention. In the hot water storage type heat pump water heater 35a shown in FIG. 13, the general hot water supply pipe 19 is connected to the a port of the first hot water supply mixing valve 21b, the intermediate temperature pipe 47b is connected to the b port of the first hot water supply mixing valve 21b, The b port of the second hot water supply mixing valve 23b is connected to the c port of the first hot water supply mixing valve 21b. In the second hot water supply mixing valve 23b, the second water supply pipe 8b is connected to the a port, and the first hot water supply pipe 24 is connected to the c port. In addition, in the hot water storage type heat pump water heater 35a which concerns on this Embodiment 2, about the same structure as the hot water storage type heat pump water heater 35 which concerns on Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. Hereinafter, operation control of the hot water storage type heat pump water heater 35a according to the second embodiment will be described.

<一般給湯運転>
本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでも、実施の形態1と同様、貯湯タンク7内の湯水の温度分布に応じて、給湯様式Aと給湯様式Bとの2つの運転様式を有する。
<General hot water supply operation>
Similarly to the first embodiment, the hot water storage heat pump water heater 35a according to the second embodiment also has two operation modes, a hot water supply mode A and a hot water supply mode B, according to the temperature distribution of the hot water in the hot water storage tank 7. .

[給湯様式Aによる一般給湯運転]
図14は、本発明の実施の形態2に係る貯湯式給湯機で給湯様式Aによる一般給湯運転を行う場合の動作を説明するための構成図である。図14に示す貯湯式ヒートポンプ給湯機35aの給湯様式Aによる一般給湯運転では、第2給湯用混合弁23bのaポートを全閉状態で保持し、第2給水配管8bから第2給湯用混合弁23bに向かう流路を遮断している。
[General hot water supply operation by hot water supply style A]
FIG. 14 is a configuration diagram for explaining an operation in the case of performing a general hot water supply operation in hot water supply mode A in the hot water storage type hot water supply apparatus according to Embodiment 2 of the present invention. In the general hot water supply operation by the hot water supply mode A of the hot water storage type heat pump water heater 35a shown in FIG. 14, the a port of the second hot water supply mixing valve 23b is held in the fully closed state, and the second hot water supply mixing valve 8b is connected to the second hot water supply pipe 8b. The flow path toward 23b is blocked.

給湯様式Aによる一般給湯運転では、第2給湯用混合弁23bのaポートが全閉状態で給湯端末の蛇口が解放されると、第1給湯用混合弁21bで貯湯タンク7上部の高温水と貯湯タンク7中部の中温水とが混合される。貯湯タンク7上部の高温水は、温水導出口7e、一般給湯配管19を経由し、第1給湯用混合弁21bのaポートに供給される。貯湯タンク7中部の中温水は、中温導出口7fから中温配管47bを経由し第1給湯用混合弁21bのbポートに供給される。   In the general hot water supply operation by the hot water supply mode A, when the port a of the second hot water supply mixing valve 23b is fully closed and the faucet of the hot water supply terminal is released, the first hot water mixing valve 21b Middle hot water in the middle of the hot water storage tank 7 is mixed. The hot water in the upper part of the hot water storage tank 7 is supplied to the a port of the first hot water supply mixing valve 21b via the hot water outlet 7e and the general hot water supply pipe 19. The intermediate temperature water in the middle of the hot water storage tank 7 is supplied from the intermediate temperature outlet 7f to the b port of the first hot water mixing valve 21b via the intermediate temperature pipe 47b.

第2給湯用混合弁23bは、aポートからの低温水の流入は無いため、給湯用温度センサ48で検出される温度と第1給湯用混合弁21bのcポートの湯水の温度とが一致する。したがって、第1給湯用混合弁21bで混合された湯水は、第2給湯用混合弁23および第1給湯配管24を経由して、給湯栓34から給湯端末へと供給される。給湯端末から給湯されると、温水導出口7eおよび中温導出口7fから導出された湯水と同量の低温水が、貯湯タンク7下部に水道等の水源から供給され、貯湯タンクは常に湯水で満たされた状態が維持される。低温水は、第1給水配管8a、減圧弁31、第3給水配管8cを経由して、水導入口7aより貯湯タンク7に供給される。   In the second hot water supply mixing valve 23b, since the low temperature water does not flow in from the a port, the temperature detected by the hot water supply temperature sensor 48 matches the temperature of the hot water in the c port of the first hot water supply mixing valve 21b. . Accordingly, the hot water mixed by the first hot water supply mixing valve 21 b is supplied from the hot water tap 34 to the hot water supply terminal via the second hot water supply mixing valve 23 and the first hot water supply pipe 24. When hot water is supplied from the hot water supply terminal, the same amount of low temperature water as the hot water led out from the hot water outlet 7e and the medium temperature outlet 7f is supplied to the lower part of the hot water tank 7 from a water source such as a tap water, and the hot water tank is always filled with hot water. The maintained state is maintained. The low temperature water is supplied to the hot water storage tank 7 from the water inlet 7a via the first water supply pipe 8a, the pressure reducing valve 31, and the third water supply pipe 8c.

[給湯様式Bによる一般給湯運転]
図15は、本発明の実施の形態2に係る貯湯式給湯機で給湯様式Bによる一般給湯運転を行う場合の動作を説明するための構成図である。図15に示す貯湯式ヒートポンプ給湯機35aの給湯様式Bによる一般給湯運転では、第1給湯用混合弁21bのbポートを全閉状態で保持し、中温導出口7fから中温配管47bを経由し第1給湯用混合弁21bに向かう流路を遮断している。
[General hot water supply operation by hot water supply style B]
FIG. 15 is a configuration diagram for explaining an operation in the case of performing a general hot water supply operation by the hot water supply style B in the hot water storage type hot water supply apparatus according to Embodiment 2 of the present invention. In the general hot water supply operation by the hot water supply mode B of the hot water storage type heat pump water heater 35a shown in FIG. 15, the b port of the first hot water supply mixing valve 21b is held in a fully closed state, and the intermediate temperature outlet 47f passes through the intermediate temperature piping 47b. The flow path toward the 1 hot water supply mixing valve 21b is blocked.

給湯様式Bによる一般給湯運転では、第1給湯用混合弁21bのbポートが全閉状態で給湯端末の蛇口が解放されると、第2給湯用混合弁23bで貯湯タンク7上部の高温水と水道等の水源から供給される低温水とが混合される。貯湯タンク7上部の高温水は、温水導出口7e、一般給湯配管19、第1給湯用混合弁21bを経由し、第2給湯用混合弁23bのbポートに供給される。低温水は、第1給水配管8a、減圧弁31、第2給水配管8bを経由し、第2給湯用混合弁23bのaポートに供給される。第2給湯用混合弁23bは、給湯用温度センサ48で検出した温度に基づいて、給湯端末の湯水の温度が設定温度を満足するように高温水と低温水とを混合する。第2給湯用混合弁23bで混合された湯水は、給湯栓34へと供給される。   In the general hot water supply operation by the hot water supply style B, when the b port of the first hot water supply mixing valve 21b is fully closed and the faucet of the hot water supply terminal is released, the second hot water supply mixing valve 23b Low temperature water supplied from a water source such as water is mixed. The hot water in the upper part of the hot water storage tank 7 is supplied to the b port of the second hot water supply mixing valve 23b via the hot water outlet 7e, the general hot water supply pipe 19, and the first hot water supply mixing valve 21b. The low temperature water is supplied to the a port of the second hot water supply mixing valve 23b via the first water supply pipe 8a, the pressure reducing valve 31, and the second water supply pipe 8b. Based on the temperature detected by the hot water supply temperature sensor 48, the second hot water supply mixing valve 23b mixes the hot water and the low temperature water so that the temperature of the hot water at the hot water supply terminal satisfies the set temperature. The hot water mixed by the second hot water supply mixing valve 23 b is supplied to the hot water tap 34.

給湯端末から給湯されると、温水導出口7eおよび中温導出口7fから導出された湯水と同量の低温水が、貯湯タンク7下部に水道等の水源から供給され、貯湯タンク7は常に湯水で満たされた状態が維持される。低温水は、第1給水配管8a、減圧弁31、第3給水配管8cを経由して、水導入口7aより貯湯タンク7に供給される。   When hot water is supplied from the hot water supply terminal, the same amount of low temperature water as the hot water led out from the hot water outlet 7e and the intermediate temperature outlet 7f is supplied to the lower part of the hot water tank 7 from a water source such as a tap water, and the hot water tank 7 is always hot water. The filled state is maintained. The low temperature water is supplied to the hot water storage tank 7 from the water inlet 7a via the first water supply pipe 8a, the pressure reducing valve 31, and the third water supply pipe 8c.

貯湯タンク7は、温水導入出口7dからHPユニット6で加熱した高温水が供給され、水導入口7aより水道等の水源から供給される低温水が供給される。このため、貯湯タンク7の内部は、上部側ほど湯水の温度が高くなり、下部側ほど湯水の温度が低くなる温度成層が形成される。   The hot water storage tank 7 is supplied with hot water heated by the HP unit 6 from the hot water introduction outlet 7d, and is supplied with low temperature water supplied from a water source such as tap water from the water introduction port 7a. For this reason, in the hot water storage tank 7, a temperature stratification is formed in which the temperature of the hot water is higher at the upper side and the temperature of the hot water is lower at the lower side.

<給湯待機状態>
次に、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでの給湯待機状態について説明する。貯湯式ヒートポンプ給湯機35aでは、給湯端末に湯水を供給していない場合でも、給湯開始時に給湯する湯水の温度が早く設定温度に至るよう応答性を向上させるため、および停電時において湯水を確保するため、第1給湯用混合弁21b、ふろ用混合弁22、第2給湯用混合弁23bに対してフィードフォワード制御により適当な開度を与えている。給湯端末に湯水を供給していない状態を給湯待機状態と呼び、この状態における第1給湯用混合弁21b、ふろ用混合弁22、第2給湯用混合弁23bの開度を起動開度と呼ぶ。給湯待機状態においても、設定温度に比べ中温水の温度が低い時、第2給湯用混合弁23bのaポートを全閉にして、第1給湯用混合弁21bを起動開度にしておくことで、給湯様式Aの給湯待機状態となり、設定温度に比べ中温水の温度が高い時、第2給湯用混合弁23bを起動開度にし、第1給湯用混合弁21bのbポートを全閉にしておくことで、給湯様式Bの給湯待機状態となる。
<Hot water supply standby state>
Next, a hot water supply standby state in the hot water storage type heat pump water heater 35a according to the second embodiment will be described. In the hot water storage type heat pump water heater 35a, even when hot water is not supplied to the hot water supply terminal, in order to improve the responsiveness so that the temperature of the hot water supplied at the start of hot water supply reaches the set temperature quickly, and to ensure hot water during a power failure Therefore, an appropriate opening degree is given to the first hot water mixing valve 21b, the bath mixing valve 22, and the second hot water mixing valve 23b by feedforward control. A state in which hot water is not supplied to the hot water supply terminal is referred to as a hot water supply standby state, and the opening degrees of the first hot water mixing valve 21b, the bath mixing valve 22 and the second hot water mixing valve 23b in this state are referred to as starting opening degrees. . Even in the hot water supply standby state, when the temperature of the intermediate temperature water is lower than the set temperature, the a port of the second hot water supply mixing valve 23b is fully closed, and the first hot water supply mixing valve 21b is set to the starting opening degree. When the hot water supply mode A is in a hot water supply standby state and the temperature of the medium-temperature water is higher than the set temperature, the second hot water supply mixing valve 23b is set to the opening degree, and the b port of the first hot water supply mixing valve 21b is fully closed. By putting it, it will be in the hot water supply standby state of hot water supply style B.

<給湯する湯水の温度を安定化させる運転制御>
上述したように、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでは、一般給湯に中温水を利用するため、一般給湯運転を行う場合に給湯様式Aと給湯様式Bとの2つの運転様式を切替えることが可能である。例えば、貯湯式ヒートポンプ給湯機35aは、設定温度に比べ中温水の温度が高い時、給湯様式Bによる一般給湯運転を実施する。しかし、貯湯式ヒートポンプ給湯機35aは、給湯により貯湯タンク7内の高温水が減少すると、中温水の温度が低下するので、設定温度に比べ中温水の温度が低くなり給湯様式Aによる一般給湯運転に切替えることが可能になる。
<Operation control to stabilize the temperature of hot water to be supplied>
As described above, in the hot water storage type heat pump water heater 35a according to the second embodiment, medium hot water is used for general hot water supply, and therefore two operation modes of hot water supply mode A and hot water supply mode B are performed when performing a general hot water supply operation. Can be switched. For example, the hot water storage type heat pump water heater 35a performs the general hot water supply operation by the hot water supply mode B when the temperature of the medium temperature water is higher than the set temperature. However, in the hot water storage type heat pump water heater 35a, when the hot water in the hot water storage tank 7 decreases due to hot water supply, the temperature of the intermediate hot water decreases, so the temperature of the intermediate hot water becomes lower than the set temperature, and the general hot water supply operation by the hot water supply mode A It becomes possible to switch to.

また、貯湯式ヒートポンプ給湯機35aは、設定温度に比べ中温水の温度が低い時、給湯様式Aによる一般給湯運転を実施する。しかし、貯湯式ヒートポンプ給湯機35aは、沸き上げ運転により貯湯タンク7内の高温水が増加すると、中温水の温度が上昇するので、設定温度に比べ中温水の温度が高くなり給湯様式Bによる一般給湯運転に切替えることが必要となる。従来の貯湯式ヒートポンプ給湯機では、一般給湯運転において、貯湯タンクの湯水の温度変化により2つの運転様式を切替えた場合、給湯端末から給湯する湯水の温度が不安定化することがあった。そこで、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでは、実施の形態1に係る貯湯式ヒートポンプ給湯機35と同様、運転様式の切替えを制限することで、給湯端末から給湯する湯水の温度を安定化させている。以下、具体的に給湯する湯水の温度を安定化させる運転制御について説明する。   Moreover, the hot water storage type heat pump water heater 35a performs the general hot water supply operation by the hot water supply mode A when the temperature of the medium temperature water is lower than the set temperature. However, in the hot water storage type heat pump water heater 35a, when the high temperature water in the hot water storage tank 7 is increased by the boiling operation, the temperature of the medium temperature water rises. It is necessary to switch to hot water supply operation. In the conventional hot water storage type heat pump water heater, when the two operation modes are switched by the temperature change of the hot water in the hot water storage tank in the general hot water supply operation, the temperature of the hot water supplied from the hot water supply terminal may become unstable. Therefore, in the hot water storage type heat pump water heater 35a according to the second embodiment, similarly to the hot water storage type heat pump water heater 35 according to the first embodiment, the temperature of the hot water supplied from the hot water supply terminal is restricted by limiting the switching of the operation mode. Is stabilizing. Hereinafter, the operation control for stabilizing the temperature of hot water to be supplied will be described in detail.

[給湯中の運転様式の切替禁止]
本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでは、給湯端末に供給する湯水の温度を安定化させる運転制御の一つとして、給湯中の運転様式の切替えを禁止する。給湯様式Bは、中温水の温度が設定温度以上の時に実施される。しかし、給湯により貯湯タンク7内の高温水が減少すると、中温水の温度が低下して設定温度未満となることがある。この時、貯湯式ヒートポンプ給湯機35aは、給湯様式Aへ運転様式を切替えることが可能となる。
[Prohibition of switching operation mode during hot water supply]
In the hot water storage type heat pump water heater 35a according to the second embodiment, switching of the operation mode during hot water supply is prohibited as one of operation controls for stabilizing the temperature of the hot water supplied to the hot water supply terminal. Hot water supply mode B is performed when the temperature of the medium-temperature water is equal to or higher than the set temperature. However, when the hot water in the hot water storage tank 7 decreases due to the hot water supply, the temperature of the intermediate hot water may decrease and become lower than the set temperature. At this time, the hot water storage type heat pump water heater 35a can switch the operation mode to the hot water supply mode A.

ここで、中温水の温度は、貯湯温度センサ41、42を利用することで測定する。例えば、貯湯温度センサ41が中温導出口7fの近傍に存在する場合、貯湯温度センサ41が検出する湯温を中温水の温度とする。貯湯温度センサ41、42が中温導出口7fに対して距離がある場合、貯湯温度センサ41、42から試算される値を中温水の温度とする。   Here, the temperature of the medium temperature water is measured by using the hot water storage temperature sensors 41 and 42. For example, when the hot water storage temperature sensor 41 exists in the vicinity of the intermediate temperature outlet 7f, the hot water temperature detected by the hot water storage temperature sensor 41 is set as the temperature of the intermediate temperature water. When the hot water storage temperature sensors 41 and 42 have a distance from the intermediate temperature outlet 7f, the value calculated from the hot water storage temperature sensors 41 and 42 is set as the temperature of the intermediate temperature water.

本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでの運転制御の一例も、図9に示すフローチャートと同じである。まず、貯湯式ヒートポンプ給湯機35aの制御装置36は、給湯様式Bにて、一般給湯運転を実施する(ステップS101)。その後、制御装置36は、貯湯温度センサ41、42が検出した温度に基づき、給湯により変化した貯湯タンク7内の湯水の温度分布を演算する(ステップS102)。制御装置36は、ステップS102で演算した貯湯タンク7内の湯水の温度分布から中温水の温度を試算し、当該中温水の温度が設定温度以上か否かを判断する(ステップS103)。中温水の温度が設定温度以上である場合(ステップS103:YES)、制御装置36は、処理をステップS101に戻し一般給湯運転の運転様式を給湯様式Bのまま継続する。   An example of operation control in the hot water storage type heat pump water heater 35a according to the second embodiment is also the same as the flowchart shown in FIG. First, the control device 36 of the hot water storage type heat pump water heater 35a performs a general hot water supply operation in the hot water supply mode B (step S101). Thereafter, the control device 36 calculates the temperature distribution of the hot water in the hot water storage tank 7 that has changed due to hot water supply, based on the temperature detected by the hot water storage temperature sensors 41 and 42 (step S102). The control device 36 calculates the temperature of the intermediate temperature water from the temperature distribution of the hot water in the hot water storage tank 7 calculated in step S102, and determines whether the temperature of the intermediate temperature water is equal to or higher than the set temperature (step S103). When the temperature of the intermediate temperature water is equal to or higher than the set temperature (step S103: YES), the control device 36 returns the process to step S101 and continues the operation mode of the general hot water supply operation with the hot water supply mode B being continued.

一方、中温水の温度が設定温度未満である場合(ステップS103:NO)、制御装置36は、給湯端末の蛇口が解放され給湯の要求があり、給湯端末から湯水を給湯中か否かを判断する(ステップS104)。給湯端末から湯水を給湯中の場合(ステップS104:YES)、制御装置36は、処理をステップS101に戻し一般給湯運転の運転様式を給湯様式Bのまま継続する。給湯端末から湯水を給湯中でない場合(ステップS104:NO)、制御装置36は、運転様式を給湯様式Aに切替える(ステップS105)。   On the other hand, when the temperature of the medium-temperature water is lower than the set temperature (step S103: NO), the control device 36 determines whether the hot water supply terminal is released and there is a request for hot water supply, and hot water is being supplied from the hot water supply terminal. (Step S104). When hot water is being supplied from the hot water supply terminal (step S104: YES), the control device 36 returns the process to step S101 and continues the operation mode of the general hot water supply operation as the hot water supply mode B. When hot water is not being supplied from the hot water supply terminal (step S104: NO), the control device 36 switches the operation mode to the hot water supply mode A (step S105).

このように、貯湯式ヒートポンプ給湯機35aでは、給湯端末から湯水を給湯中に運転様式の切替えが起こらないように禁止しているため、給湯端末から湯水を給湯中に湯水の温度が突然変化することを回避できる。   As described above, in the hot water storage type heat pump water heater 35a, the hot water temperature is suddenly changed during the hot water supply from the hot water supply terminal since the operation mode is not changed during the hot water supply from the hot water supply terminal. You can avoid that.

[給湯中の沸き上げ運転の制限]
次に、制御装置36が、一般給湯運転の運転様式を給湯様式Aに切替え、運転を実施している場合について説明する。給湯様式Aは、中温水の温度が設定温度未満の時に実施される。しかし、沸き上げ運転により貯湯タンク7内の高温水が増加すると、中温水の温度が上昇して設定温度以上となることがある。この時、貯湯式ヒートポンプ給湯機35aは、給湯様式Bへ運転様式を切替えることが必要となる。逆に、貯湯式ヒートポンプ給湯機35aは、給湯様式Bによる一般給湯運転に切替えない場合、設定温度に比べて高い中温水と高温水とを混合したのでは、設定温度の湯水を給湯することができなくなる。
[Restriction of boiling operation during hot water supply]
Next, the case where the control device 36 switches the operation mode of the general hot water supply operation to the hot water supply mode A and performs the operation will be described. Hot water supply mode A is performed when the temperature of the medium-temperature water is lower than the set temperature. However, if the high temperature water in the hot water storage tank 7 increases due to the boiling operation, the temperature of the medium temperature water may rise and become the set temperature or higher. At this time, the hot water storage type heat pump water heater 35a needs to switch the operation mode to the hot water supply mode B. On the other hand, if the hot water storage type heat pump water heater 35a is not switched to the general hot water supply operation by the hot water supply mode B, hot water at a set temperature can be supplied by mixing hot water with medium hot water higher than the set temperature. become unable.

しかし、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでは、高温水と中温水とが混合する第1給湯用混合弁21bの下流側に位置する第2給湯用混合弁23bで低温水と混合する構成である。そのため、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでは、第1給湯用混合弁21bのcポートから供給される湯水を第2給湯用混合弁23bで低温水と混合することで、給湯端末の湯水の温度が設定温度を満足するようにできる。したがって、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでは、給湯端末への給湯が実施されている間、第1給湯用混合弁21bの開度を固定したまま、第2給湯用混合弁23bを制御して設定温度を満足する給湯温度の湯水を給湯端末に給湯することができる。その後、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aは、第1給湯用混合弁21bのbポートを全閉、第2給湯用混合弁23bを起動開度にしておくことで、給湯端末への給湯温度を乱すことなく、給湯様式Aから給湯様式Bへの運転様式の切替えが可能となる。   However, in the hot water storage type heat pump water heater 35a according to the second embodiment, the second hot water mixing valve 23b located on the downstream side of the first hot water mixing valve 21b in which high temperature water and medium temperature water are mixed is mixed with low temperature water. It is the structure which mixes. Therefore, in the hot water storage type heat pump water heater 35a according to the second embodiment, hot water supplied from the c port of the first hot water supply mixing valve 21b is mixed with low temperature water by the second hot water supply mixing valve 23b. The temperature of the hot water of the terminal can be set to satisfy the set temperature. Therefore, in the hot water storage type heat pump water heater 35a according to the second embodiment, while the hot water supply to the hot water supply terminal is being performed, the second hot water supply mixing valve is maintained while the opening degree of the first hot water supply mixing valve 21b is fixed. It is possible to supply hot water at a hot water supply temperature that satisfies the set temperature by controlling 23b. Thereafter, the hot water storage heat pump water heater 35a according to the second embodiment fully closes the b port of the first hot water supply mixing valve 21b and keeps the second hot water supply mixing valve 23b at the opening degree, thereby providing a hot water supply terminal. The operation mode can be switched from the hot water supply mode A to the hot water supply mode B without disturbing the hot water supply temperature.

図16は、本発明の実施の形態2に係る貯湯式給湯機での運転制御の一例を示すフローチャートである。まず、貯湯式ヒートポンプ給湯機35aの制御装置36は、給湯様式Aにて、一般給湯運転を実施する(ステップS301)。なお、ステップS301を実施する段階は、給湯様式Aで実際に給湯端末から湯水を供給している状態に限られず、まだ給湯端末に湯水を供給していない状態ではあるが、給湯端末の蛇口が解放され給湯の要求があった場合に給湯様式Aを実施できる待機状態も含まれる。その後、制御装置36は、沸き上げ要求に従い沸き上げ運転を実施する(ステップS302)。その後、制御装置36は、貯湯温度センサ41、42が検出した温度に基づき中温水の温度を試算し、当該中温水の温度が設定温度以上か否かを判断する(ステップS303)。中温水の温度が設定温度未満である場合(ステップS303:NO)、制御装置36は、処理をステップS301に戻し一般給湯運転の運転様式を給湯様式Aのまま継続する。   FIG. 16 is a flowchart showing an example of operation control in the hot water storage type hot water supply apparatus according to Embodiment 2 of the present invention. First, the control device 36 of the hot water storage type heat pump water heater 35a performs a general hot water supply operation in the hot water supply mode A (step S301). Note that the stage of performing step S301 is not limited to the state in which hot water is actually supplied from the hot water supply terminal in the hot water supply mode A, and the state in which hot water is not yet supplied to the hot water supply terminal, A standby state in which the hot water supply mode A can be implemented when the hot water supply is requested after being released is also included. Thereafter, the controller 36 performs a boiling operation in accordance with the boiling request (step S302). Thereafter, the control device 36 makes a trial calculation of the temperature of the medium-temperature water based on the temperatures detected by the hot water storage temperature sensors 41 and 42, and determines whether or not the temperature of the medium-temperature water is equal to or higher than the set temperature (step S303). When the temperature of the medium temperature water is lower than the set temperature (step S303: NO), the control device 36 returns the process to step S301 and continues the operation mode of the general hot water supply operation with the hot water supply mode A.

中温水の温度が設定温度以上である場合(ステップS303:YES)、制御装置36は、第1給湯用混合弁21bの開度を固定する(ステップS304)。その後、制御装置36は、給湯用温度センサ48で検出した温度に基づいて、給湯端末の湯水の温度が設定温度を満足するように第2給湯用混合弁23bを制御する。制御装置36は、給湯端末の蛇口が解放され給湯の要求があり、給湯端末から湯水を給湯中か否かを判断する(ステップS306)。給湯端末から湯水を給湯中の場合(ステップS306:YES)、制御装置36は、処理をステップS304に戻し一般給湯運転の運転様式を給湯様式Aのまま継続し、第1給湯用混合弁21bの開度を固定したまま(ステップS304)、第2給湯用混合弁23bを制御して設定温度を満足する給湯温度に調整する(ステップS305)処理を継続する。給湯端末から湯水を給湯中でない場合(ステップS306:NO)、制御装置36は、運転様式を給湯様式Bに切替える(ステップS307)。   When the temperature of the medium temperature water is equal to or higher than the set temperature (step S303: YES), the control device 36 fixes the opening of the first hot water supply mixing valve 21b (step S304). Thereafter, the control device 36 controls the second hot water supply mixing valve 23b based on the temperature detected by the hot water supply temperature sensor 48 so that the temperature of the hot water at the hot water supply terminal satisfies the set temperature. The control device 36 determines whether or not the faucet of the hot water supply terminal is released and there is a request for hot water supply, and hot water is being supplied from the hot water supply terminal (step S306). When hot water is being supplied from the hot water supply terminal (step S306: YES), the control device 36 returns the process to step S304 and continues the operation mode of the general hot water supply operation with the hot water supply mode A, and the first hot water supply mixing valve 21b. With the opening degree fixed (step S304), the second hot water supply mixing valve 23b is controlled to adjust the hot water supply temperature to satisfy the set temperature (step S305). When hot water is not being supplied from the hot water supply terminal (step S306: NO), the control device 36 switches the operation mode to the hot water supply mode B (step S307).

以上、説明のように本実施の形態2に係る貯湯式ヒートポンプ給湯機35aは、制御装置36が、貯湯温度センサ41、42で検出した貯湯タンク7内の湯水の温度変化に応じて第1給湯用混合弁21bおよび第2給湯用混合弁23bの開閉を制御して、給湯対象への給湯に利用する配管の切替えを行い、給湯対象への給湯中に、当該配管の切替えを制限するので、湯水を継続して給湯する場合に安定して設定温度の湯水を供給することができる。なお、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aにおいても、実施の形態1と同様、一般給湯運転の運転様式を切替える場合、第1給湯用混合弁21bのaポートの開度および第2給湯用混合弁23bのbポートの開度を図11および図12で示したように調整することで、制御を単純化でき、給湯端末に供給する湯水の温度の安定化を図ることができる。なお、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aでも、貯湯タンク7に3つの出湯口(温水導入出口7d、温水導出口7e、中温導出口7f)を有し、それらの出湯口が3つの混合弁(第1給湯用混合弁21b、ふろ用混合弁22、第2給湯用混合弁23b)を利用して混合される例を示したが、これに限られず貯湯タンク7が2つ以上の出湯口を有し、混合に利用する出湯配管を切替えることが可能であればよい。なお、本実施の形態2に係る貯湯式ヒートポンプ給湯機35aは、第1給湯用混合弁21bおよび第2給湯用混合弁23bの構成が異なる以外、実施の形態1に係る貯湯式ヒートポンプ給湯機35で説明した構成を適用することが可能である。   As described above, the hot water storage type heat pump water heater 35a according to the second embodiment has the first hot water supply according to the temperature change of the hot water in the hot water storage tank 7 detected by the control device 36 with the hot water storage temperature sensors 41 and 42. Because the opening and closing of the mixing valve 21b and the second hot water supply mixing valve 23b are controlled to switch the pipe used for hot water supply to the hot water supply target, and the switching of the pipe is restricted during the hot water supply to the hot water supply target. When hot water is continuously supplied, hot water at a set temperature can be stably supplied. In the hot water storage heat pump water heater 35a according to the second embodiment, as in the first embodiment, when the operation mode of the general hot water supply operation is switched, the opening degree of the a port of the first hot water supply mixing valve 21b and the first By adjusting the opening of the b port of the 2 hot water supply mixing valve 23b as shown in FIGS. 11 and 12, the control can be simplified and the temperature of the hot water supplied to the hot water supply terminal can be stabilized. . Note that the hot water storage heat pump water heater 35a according to the second embodiment also has three hot water outlets (the hot water introduction outlet 7d, the hot water outlet 7e, and the intermediate temperature outlet 7f) in the hot water storage tank 7, and these hot outlets Although the example which mixes using three mixing valves (The 1st hot-water supply mixing valve 21b, the bath mixing valve 22, and the 2nd hot-water supply mixing valve 23b) was shown, it is not restricted to this but two hot water storage tanks 7 are provided. What is necessary is just to have the above hot water outlet and to be able to switch the hot water piping used for mixing. The hot water storage type heat pump water heater 35a according to the second embodiment is different from the first hot water mixing valve 21b and the second hot water mixing valve 23b in the configuration except for the hot water storage heat pump water heater 35 according to the first embodiment. It is possible to apply the configuration described in the above.

今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した実施の形態ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。   The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 圧縮機、2 水冷媒熱交換器、3 膨張弁、4 冷媒配管、5 空気熱交換器、6 HPユニット、7 貯湯タンク、7a 水導入口、7c 温水導入口、7d 温水導入出口、7e 温水導出口、7f 中温導出口、8 給水配管、8a 第1給水配管、8b 第2給水配管、8c 第3給水配管、9 水導出口配管、10 三方弁、11 熱源ポンプ、12 送湯配管、13 HP往き配管、14 HP戻り配管、15 第1バイパス配管、16 第2バイパス配管、17 四方弁、18a 温水導入配管、18b 温水導出配管、18 ふろ用熱交換器、19 一般給湯配管、20 ふろ給湯配管、 21,21b 第1給湯用混合弁、22 ふろ用混合弁、23,23b 第2給湯用混合弁、24 第1給湯配管、25 第2給湯配管、26 ふろ用電磁弁、27 ふろ往き配管、28 ふろ戻り配管、29 ふろ循環ポンプ、30 浴槽、31 減圧弁、33 タンクユニット、34 給湯栓、35 貯湯式ヒートポンプ給湯機、36 制御部、37 ふろ往き温度センサ、38 ふろ戻り温度センサ、39 HP出湯温度センサ、40 HP入水温度センサ、41,42 貯湯温度センサ、43 リモコン、45 水位センサ、46,46a フロースイッチ、47,47b 中温配管、48 給湯用温度センサ。   DESCRIPTION OF SYMBOLS 1 Compressor, 2 Water refrigerant heat exchanger, 3 Expansion valve, 4 Refrigerant piping, 5 Air heat exchanger, 6 HP unit, 7 Hot water storage tank, 7a Water inlet, 7c Hot water inlet, 7d Hot water inlet, 7e Hot water Outlet, 7f Medium temperature outlet, 8 Water supply piping, 8a 1st water supply piping, 8b 2nd water supply piping, 8c 3rd water supply piping, 9 Water outlet piping, 10 Three-way valve, 11 Heat source pump, 12 Hot water supply piping, 13 HP forward piping, 14 HP return piping, 15 1st bypass piping, 16 2nd bypass piping, 17 4-way valve, 18a Hot water introduction piping, 18b Hot water outlet piping, 18 bath heat exchanger, 19 hot water supply piping, 20 bath hot water supply Piping, 21, 21b 1st hot water supply mixing valve, 22 bathing mixing valve, 23, 23b 2nd hot watering mixing valve, 24 1st hot water supply piping, 25 2nd hot water feeding piping, 26 bathing electromagnetic 27 Bath piping, 28 Bath return piping, 29 Bath circulation pump, 30 Bathtub, 31 Pressure reducing valve, 33 Tank unit, 34 Hot water tap, 35 Hot water storage heat pump water heater, 36 Control unit, 37 Bath temperature sensor, 38 Bath Return temperature sensor, 39 HP hot water temperature sensor, 40 HP incoming water temperature sensor, 41, 42 Hot water storage temperature sensor, 43 Remote control, 45 Water level sensor, 46, 46a Flow switch, 47, 47b Medium temperature piping, 48 Hot water temperature sensor.

Claims (10)

湯水を加熱する加熱部と、
前記加熱部で加熱した温水を貯湯する貯湯タンクと、
前記貯湯タンクから湯水を取り出す複数の出湯配管と、
低温水を供給する給水配管と、
前記複数の出湯配管および前記給水配管のうち少なくとも2つの配管から供給される異なる温度の湯水を混合する複数の混合弁と、
前記貯湯タンク内の湯水の温度を検出する複数の貯湯温度検出部と、
前記複数の混合弁の開閉を制御する制御部と、を備え、
前記制御部は、
前記複数の貯湯温度検出部で検出した前記貯湯タンク内の湯水の温度変化に応じて前記複数の混合弁の開閉を制御して、給湯対象への給湯に利用する配管の切替えを行い、
前記給湯対象への給湯中に、当該配管の切替えを制限する、貯湯式給湯機。
A heating section for heating hot water,
A hot water storage tank for storing hot water heated by the heating unit;
A plurality of hot water pipes for extracting hot water from the hot water storage tank;
A water supply pipe for supplying low-temperature water;
A plurality of mixing valves for mixing hot water of different temperatures supplied from at least two of the plurality of outlet hot water pipes and the water supply pipe;
A plurality of hot water temperature detectors for detecting the temperature of hot water in the hot water tank;
A controller for controlling opening and closing of the plurality of mixing valves,
The controller is
Controlling the opening and closing of the plurality of mixing valves according to the temperature change of the hot water in the hot water storage tank detected by the plurality of hot water storage temperature detection units, switching the pipe used for hot water supply to the hot water supply target,
A hot water storage type hot water supply device that restricts switching of the piping during hot water supply to the hot water supply target.
前記制御部で配管の切替えを制限する動作には、前記複数の混合弁を開閉する動作、前記貯湯タンク内より、前記複数の出湯配管に含まれる特定の出湯配管が取り出す湯水の温度上昇を抑える動作が含まれる、請求項1に記載の貯湯式給湯機。   The operation of restricting the switching of the piping by the control unit includes an operation of opening and closing the plurality of mixing valves, and suppressing a rise in the temperature of hot water taken out from the hot water storage tank by specific hot water piping included in the hot water storage piping. The hot water storage type water heater according to claim 1, wherein the operation is included. 前記制御部は、
前記複数の出湯配管のうち一つの配管から供給される湯水の温度が前記給湯対象に給湯する設定温度より低くなっても、配管の切替えを制限する、請求項2に記載の貯湯式給湯機。
The controller is
The hot water storage type hot water supply device according to claim 2, wherein switching of the piping is restricted even if the temperature of hot water supplied from one piping among the plurality of outlet piping is lower than a set temperature for supplying hot water to the hot water supply target.
前記制御部は、
前記貯湯タンク内より、前記複数の出湯配管に含まれる特定の出湯配管が取り出す湯水の温度上昇を抑えるため前記加熱部での加熱を制限する、請求項2に記載の貯湯式給湯機。
The controller is
The hot water storage type hot water supply apparatus according to claim 2, wherein heating in the heating unit is restricted in order to suppress a rise in temperature of hot water taken out from the hot water storage tank by specific hot water piping included in the multiple hot water pipings.
前記加熱部は、
前記貯湯タンク内より、前記複数の出湯配管に含まれる特定の出湯配管が取り出す湯水の温度上昇を抑えるため稼動を制限する、請求項4に記載の貯湯式給湯機。
The heating unit is
The hot water storage type hot water supply device according to claim 4, wherein operation is restricted in order to suppress a rise in temperature of hot water taken out by a specific hot water discharge pipe included in the plurality of hot water discharge pipes from within the hot water storage tank.
前記加熱部は、
前記貯湯タンク内より、前記複数の出湯配管に含まれる特定の出湯配管が取り出す湯水の温度上昇を抑えるため温水を加熱する能力を制限する、請求項4に記載の貯湯式給湯機。
The heating unit is
The hot water storage type hot water supply device according to claim 4, wherein the hot water supply capacity is limited from the inside of the hot water storage tank in order to suppress the temperature rise of hot water taken out by specific hot water pipes included in the multiple hot water pipes.
前記加熱部は、
前記貯湯タンク内より、前記複数の出湯配管に含まれる特定の出湯配管が取り出す湯水の温度上昇を抑えるため、前記貯湯タンクから供給される温水の量を制限する、請求項4に記載の貯湯式給湯機。
The heating unit is
The hot water storage system according to claim 4, wherein the amount of hot water supplied from the hot water storage tank is limited in order to suppress a rise in temperature of hot water taken out from the hot water storage tank by specific hot water piping included in the plurality of hot water pipings. Water heater.
前記給湯対象へ給湯する湯水の温度を検出する給湯温度検出部をさらに備え、
前記制御部は、
給湯に利用する配管に切替える場合に、給湯への利用を停止する配管に接続された混合弁の閉動作を予め規定された速度で行い、前記給湯温度検出部で検出した温度に基づき、給湯への利用を開始する配管に接続された混合弁の開動作の速度を制限する、請求項2に記載の貯湯式給湯機。
A hot water supply temperature detection unit for detecting a temperature of hot water to be supplied to the hot water supply object;
The controller is
When switching to a pipe used for hot water supply, the mixing valve connected to the pipe that stops using hot water is closed at a predetermined speed. Based on the temperature detected by the hot water temperature detector, The hot water storage type hot water supply device according to claim 2, wherein the speed of the opening operation of the mixing valve connected to the pipe for starting the use of is restricted.
前記複数の出湯配管は、
第1出湯配管と、
前記第1出湯配管とは前記貯湯タンクの異なる位置から湯水を取り出す第2出湯配管とを含み、
前記複数の混合弁は、
前記第1出湯配管から供給される湯水と、前記給水配管から供給される低温水とを混合する第1混合弁と、
前記第1混合弁から供給される湯水と、前記第2出湯配管から供給される湯水とを混合する第2混合弁とを含み、
前記制御部は、
前記給湯対象に給湯する設定温度より前記第1出湯配管から供給される湯水の温度が高く、前記第2出湯配管から供給される湯水の温度が低い場合、前記第1混合弁を閉じ、前記第2混合弁を開いて、前記第1出湯配管から供給される湯水と前記第2出湯配管から供給される湯水とを混合して給湯を行い、
前記貯湯タンク内の湯水の温度変化によって、前記給湯対象に給湯する設定温度より前記第1出湯配管および前記第2出湯配管から供給される湯水の温度がともに高くなった場合、前記第1混合弁を開き、前記第2混合弁を閉じて、前記第1出湯配管から供給される湯水と前記給水配管から供給される低温水とを混合して給湯を行う、請求項1〜請求項8のいずれか1項に記載の貯湯式給湯機。
The plurality of tapping pipes are
First hot water piping,
The first hot water piping includes a second hot water piping for extracting hot water from different positions of the hot water storage tank,
The plurality of mixing valves are:
A first mixing valve for mixing hot water supplied from the first hot water supply pipe and low-temperature water supplied from the water supply pipe;
Hot water supplied from the first mixing valve, and a second mixing valve for mixing hot water supplied from the second hot water piping,
The controller is
When the temperature of hot water supplied from the first hot water supply pipe is higher than the set temperature for supplying hot water to the hot water supply target and the temperature of hot water supplied from the second hot water supply pipe is low, the first mixing valve is closed, 2 Open the mixing valve, mix hot water supplied from the first hot water piping and hot water supplied from the second hot water piping, and supply hot water,
When the temperature of hot water supplied from the first hot water supply pipe and the second hot water supply pipe becomes higher than the set temperature for supplying hot water to the hot water supply object due to the temperature change of the hot water in the hot water storage tank, the first mixing valve 8 is closed, the second mixing valve is closed, and hot water supplied from the first hot water supply pipe and low temperature water supplied from the water supply pipe are mixed to supply hot water. The hot water storage type water heater according to claim 1.
湯水を加熱する加熱部と、
前記加熱部で加熱した温水を貯湯する貯湯タンクと、
前記貯湯タンクから湯水を取り出す複数の出湯配管と、
低温水を供給する給水配管と、
前記複数の出湯配管および前記給水配管のうち少なくとも2つの配管から供給される異なる温度の湯水を混合する複数の混合弁と、
前記貯湯タンク内の湯水の温度を検出する複数の貯湯温度検出部と、
前記複数の混合弁の開閉を制御する制御部とを備える貯湯式給湯機での給湯方法であって、
前記複数の貯湯温度検出部で検出した前記貯湯タンク内の湯水の温度変化を検出する検出ステップと、
検出した前記貯湯タンク内の湯水の温度変化に応じて前記複数の混合弁の開閉を制御して、給湯対象への給湯に利用する配管の切替えを行うか否かを判定する判定ステップと、
前記判定ステップで配管の切替えを行うと判定した場合に、前記給湯対象への給湯中であれば配管の切替えを制限する制限ステップとを含む、貯湯式給湯機での給湯方法。
A heating section for heating hot water,
A hot water storage tank for storing hot water heated by the heating unit;
A plurality of hot water pipes for extracting hot water from the hot water storage tank;
A water supply pipe for supplying low-temperature water;
A plurality of mixing valves for mixing hot water of different temperatures supplied from at least two of the plurality of outlet hot water pipes and the water supply pipe;
A plurality of hot water temperature detectors for detecting the temperature of hot water in the hot water tank;
A hot water supply method in a hot water storage type hot water heater comprising a control unit that controls opening and closing of the plurality of mixing valves,
A detection step of detecting a temperature change of the hot water in the hot water storage tank detected by the plurality of hot water storage temperature detection units;
A determination step of determining whether to switch the pipes used for hot water supply to the hot water supply target by controlling opening and closing of the plurality of mixing valves according to the detected temperature change of the hot water in the hot water storage tank;
A hot water supply method in a hot water storage type hot water supply apparatus, including a limiting step of restricting the switching of the piping when the hot water supply to the hot water supply target is being performed when it is determined that the piping is switched in the determination step.
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JP7505997B2 (en) 2021-01-27 2024-06-25 株式会社コロナ Storage-type hot water supply system

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