JP2009210150A

JP2009210150A - Hot water supply system

Info

Publication number: JP2009210150A
Application number: JP2008050937A
Authority: JP
Inventors: Shinya Sawada; 慎也澤田; Hideto Shinpo; 秀人新保; Nobuhiko Toda; 亘彦戸田
Original assignee: Panasonic Electric Works Co Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2008-02-29
Filing date: 2008-02-29
Publication date: 2009-09-17
Anticipated expiration: 2028-02-29
Also published as: JP5225714B2

Abstract

<P>PROBLEM TO BE SOLVED: To perform instantaneous water heating at a low cost by replacing hot water in a hot water delivery pipe in a circulation pathway with boiled water in a hot water supply system. <P>SOLUTION: This hot water supply system 1 includes a water heater 2, the hot water delivery pipe 4, a return pipe 5 branched from the hot water delivery pipe 4 and connected to a water heater 2, a hot water delivery pump 51, and a control section 6 for controlling the water heater 2 and the like. The control section 6 has an inner volume holding section 61 holding a value of an inner volume of the hot water delivery pipe 4. The control section 6 sets a length of an operation time of a circulating operation necessary for replacing the hot water in the hot water delivery pipe 4 with the hot water boiled by the water heater 2 on the basis of the value of the inner volume and a hot water flow rate of the hot water delivery pump 51. As the control section 6 replaces only the hot water in the hot water delivery pipe 4 with the boiled hot water by performing the circulating operation, and the hot water in the return pipe 5 is not replaced, wasteful circulating operation can be prevented, and operation cost for instantaneous water heating can be reduced. Furthermore, as the length of the operation time can be set without installing a temperature sensor and the like, equipment cost can be also reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、即湯を行うことができる給湯システムに関する。 The present invention relates to a hot water supply system capable of performing instant hot water.

従来から、出湯時に直ぐに沸かし上げられた湯が出湯される即湯を行えるように、出湯配管から分岐して給湯機に戻る戻し配管を設け、常に出湯配管と戻し配管に沸かし上げた湯を循環させて、出湯配管の湯温を維持し、即湯が行えるようにした給湯システムが知られている。しかしながら、常に沸かし上げた湯を循環させるためにコスト高となる。 Conventionally, a return pipe that branches from the hot water supply pipe and returns to the water heater is provided so that the hot water that has been boiled up immediately at the time of hot water can be discharged. In addition, a hot water supply system is known in which the hot water temperature of the outlet piping is maintained and instant hot water can be used. However, the cost is high because the hot water is always circulated.

また、戻し配管に温度センサを設け、戻し配管中の湯温が低下すると、戻し配管中の湯温が沸かし上げられた湯の温度になるまで循環運転を行う給湯システムが知られている（例えば、特許文献１参照）。 Also, there is a known hot water supply system in which a temperature sensor is provided in the return pipe, and when the hot water temperature in the return pipe is lowered, the hot water temperature in the return pipe is circulated until the hot water temperature reaches the boiling water temperature (for example, , See Patent Document 1).

しかしながら、特許文献１に示される給湯システムにおいては、出湯配管中の湯だけでなく戻し配管中の湯も沸かし上げた湯と置換することになり、無駄な循環運転を行なうのでコスト高となる。
特開平６−２７２９６１号公報 However, in the hot water supply system disclosed in Patent Document 1, not only the hot water in the tapping pipe but also the hot water in the return pipe is replaced with the boiled hot water, and wasteful circulation operation is performed, resulting in high cost.
Japanese Patent Laid-Open No. Hei 6-272961

本発明は、上記従来の問題を解決するためになされたものであり、循環経路の内の出湯配管中の湯を沸かし上げた湯と置換し、即湯を低コストで行うことができる給湯システムを提供することを目的とする。 The present invention has been made in order to solve the above-described conventional problems, and replaces hot water in a hot water supply pipe in a circulation path with hot water that has been boiled, so that hot water can be performed immediately at low cost. The purpose is to provide.

上記目的を達成するために請求項１の発明は、湯を沸かし上げる給湯機と、前記給湯機により沸かし上げられた湯を出湯する出湯配管と、前記出湯配管から分岐して前記給湯機に接続され前記出湯配管中の湯を前記給湯機に戻す戻し配管と、前記出湯配管と戻し配管よりなる循環経路に前記給湯機により沸かし上げられた湯を循環させる循環運転を行う送湯ポンプと、前記給湯機と送湯ポンプを制御する制御部と、を備えた給湯システムにおいて、前記制御部は、前記出湯配管の内容積の値が入力される内容積保持部を備え、前記内容積の値に基づき前記循環運転の運転時間長を定め、前記循環運転を所定のタイミングで行い、前記出湯配管中の湯を前記給湯機により沸かし上げられた湯と置換するものである。 In order to achieve the above object, the invention of claim 1 is directed to a hot water heater for boiling hot water, a hot water piping for discharging hot water boiled by the hot water heater, and a branch from the hot water piping connected to the hot water heater. A return pipe for returning the hot water in the hot water supply pipe to the hot water supply machine, a hot water supply pump for performing a circulating operation for circulating the hot water boiled up by the hot water supply apparatus in a circulation path comprising the hot water supply pipe and the return pipe, and In a hot water supply system comprising a hot water supply system and a control unit for controlling a hot water supply pump, the control unit includes an internal volume holding unit to which an internal volume value of the hot water supply pipe is input, and the internal volume value is set to the value. On the basis of this, the operation time length of the circulation operation is determined, the circulation operation is performed at a predetermined timing, and the hot water in the tapping pipe is replaced with the hot water boiled up by the water heater.

請求項２の発明は、請求項１に記載の給湯システムにおいて、外気温を検出する温度センサを備え、前記制御部は、前記温度センサが検出した外気温に基づいて前記循環運転を所定の時間間隔毎に行うものである。 According to a second aspect of the present invention, in the hot water supply system according to the first aspect, a temperature sensor that detects an outside air temperature is provided, and the control unit performs the circulation operation for a predetermined time based on the outside air temperature detected by the temperature sensor. This is done at intervals.

請求項１の発明によれば、出湯配管中の湯のみが沸かし上げた湯と置換され、戻し配管中の湯は沸かし上げた湯と置換しないので、無駄な循環運転を防止し、即湯の運転コストを低くすることができる。また、循環経路に温度センサ等を設置することなく循環運転の運転時間長を設定することができるので、設備コストを低くすることができる。 According to the first aspect of the present invention, only the hot water in the outlet pipe is replaced with the boiled hot water, and the hot water in the return pipe is not replaced with the boiled hot water. Cost can be lowered. Moreover, since the operation time length of the circulation operation can be set without installing a temperature sensor or the like in the circulation path, the equipment cost can be reduced.

請求項２の発明によれば、外気温に基づいて循環運転の時間間隔を調整するので、外気温が変動しても即湯を効率良く行なうことができる。 According to the invention of claim 2, since the time interval of the circulation operation is adjusted based on the outside air temperature, the hot water can be efficiently performed even if the outside air temperature fluctuates.

（第１の実施形態）
本発明の第１の実施形態に係る給湯システムについて図１を参照して説明する。図１は、給湯システムの構成を示す。給湯システム１は、湯を沸かし上げる給湯機２と、給湯機２と出湯口３を繋ぎ、沸かし上げられた湯を出湯口３へ送る出湯配管４と、出湯配管４から分岐して給湯機２に接続され、出湯配管４中の湯を給湯機２に戻す戻し配管５と、戻し配管５に設けられた送湯ポンプ５１と、給湯機２や送湯ポンプ５１等の動作を制御する制御部６と、を備えている。出湯配管４と戻し配管５とは、循環経路７を形成しており、制御部６は、給湯機２によって沸かし上げられた湯を循環させる循環運転を、送湯ポンプ５１によって行なう。 (First embodiment)
A hot water supply system according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a configuration of a hot water supply system. The hot water supply system 1 includes a hot water heater 2 that boils hot water, a hot water supply pipe 4 that connects the hot water heater 2 and the hot water outlet 3, and sends the heated hot water to the hot water outlet 3. , A return pipe 5 for returning the hot water in the hot water supply pipe 4 to the water heater 2, a hot water supply pump 51 provided in the return pipe 5, and a control unit for controlling the operation of the water heater 2, the hot water supply pump 51, etc. 6 are provided. The hot water supply pipe 4 and the return pipe 5 form a circulation path 7, and the control unit 6 performs a circulation operation for circulating the hot water boiled up by the hot water heater 2 by the hot water supply pump 51.

制御部６は、出湯配管４の内容積の値を保持する内容積保持部６１を有している。内容積保持部６１には、例えばテンキー（図示せず）によって内容積の値が入力される。また、内容積の値に代えて出湯配管４の長さと、内径や断面積の値が入力されるようにし、それらの値から内容積の値を算出して保持してもよい。 The control unit 6 has an internal volume holding unit 61 that holds the value of the internal volume of the hot water piping 4. A value of the internal volume is input to the internal volume holding unit 61 by, for example, a numeric keypad (not shown). Further, instead of the value of the internal volume, the length of the hot water supply pipe 4, the value of the inner diameter and the cross-sectional area may be input, and the value of the internal volume may be calculated and held from these values.

制御部６は、内容積保持部６１が保持する出湯配管４の内容積の値と、送湯ポンプ５１の送湯流量から、出湯配管４内の湯を給湯機２により沸かし上げられた湯と置換するのに必要な循環運転の運転時間長を設定する。運転時間長は、送湯ポンプ５１の送湯流量が送湯能力に応じて、ほぼ一定であるとして、次式により定められる。ここで、余裕率は、給湯システム１の使用状況に応じて定める。
運転時間長＝（出湯配管の内容積）÷（送湯ポンプの送湯流量）×余裕率 The control unit 6 is configured to determine whether the hot water in the hot water supply pipe 4 is boiled up by the hot water heater 2 from the value of the internal volume of the hot water supply pipe 4 held by the internal volume holding unit 61 and the hot water supply flow rate of the hot water supply pump 51. Set the operation time length of the circulating operation required for replacement. The operating time length is determined by the following equation assuming that the hot water supply flow rate of the hot water supply pump 51 is substantially constant according to the hot water supply capacity. Here, the margin rate is determined according to the use situation of the hot water supply system 1.
Operating time length = (internal volume of hot water piping) ÷ (hot water supply flow rate of hot water supply pump) x margin rate

出湯配管４には、圧力センサ（図示せず）が配されており、制御部６は圧力センサの検出した出湯配管４の内圧に基づいて出湯口３の開閉を判断し、出湯口３からの出湯が一定時間以上行なわれない場合には、送湯ポンプ５１によって循環運転を行なう。 A pressure sensor (not shown) is arranged in the hot water piping 4, and the control unit 6 determines whether the hot water outlet 3 is opened or closed based on the internal pressure of the hot water piping 4 detected by the pressure sensor. When the hot water is not discharged for a certain time or longer, the hot water supply pump 51 performs the circulation operation.

上記構成の給湯システム１において、出湯口３が開かれると、給湯機２への給水圧によって、給湯機２中の沸かし上げられた湯が出湯配管４を通って出湯口３より出湯される。制御部６は、圧力センサによって出湯口３の開閉を常に監視しており、出湯口３からの出湯が一定時間以上行なわれない場合には出湯配管４中の湯温が低下したとして、送湯ポンプ５１を予め定めた運転時間長、駆動し、循環運転を行なう。出湯配管４中の湯が給湯機２で沸かし上げられた湯と置換される。このようにして、出湯配管４中の湯が給湯機２によって沸かし上げられた湯と置換されるので、常に即湯を行なうことができる。また、出湯配管４中の湯のみを沸かし上げられた湯と置換し、戻し配管５中の湯は沸かし上げた湯と置換しないので、無駄な循環運転を防止し、即湯の運転コストを低くすることができる。また、循環経路に温度センサ等を設置することなく、循環運転の運転時間長を設定することができるので、設備コストを低くすることができる。 In the hot water supply system 1 having the above-described configuration, when the hot water outlet 3 is opened, the hot water heated in the hot water heater 2 is discharged from the hot water outlet 3 through the hot water supply pipe 4 due to the water supply pressure to the hot water heater 2. The control unit 6 constantly monitors the opening and closing of the tap 3 with the pressure sensor. If the tap from the tap 3 has not been discharged for a certain period of time, it is assumed that the hot water temperature in the tap 4 has decreased. The pump 51 is driven for a predetermined operation time length to perform circulation operation. The hot water in the hot water supply pipe 4 is replaced with the hot water boiled by the water heater 2. In this way, the hot water in the hot water supply pipe 4 is replaced with the hot water boiled up by the hot water supply device 2, so that the hot water can always be used immediately. Further, only the hot water in the outlet pipe 4 is replaced with the boiled hot water, and the hot water in the return pipe 5 is not replaced with the boiled hot water, thereby preventing unnecessary circulation operation and reducing the operating cost of the instant hot water. be able to. Further, since the operation time length of the circulation operation can be set without installing a temperature sensor or the like in the circulation path, the equipment cost can be reduced.

（第２の実施形態）
本発明の第２の実施形態に係る給湯システムについて説明する。本実施形態の給湯システムは、外気温を検出する温度センサ８を備えている。制御部６は、循環運転を予め定めた時間間隔毎に行なう。そして、温度センサ８が検出した外気温に基づいて、外気温が低い場合には出湯配管４中の湯温の低下速度が早いので、循環運転の時間間隔を短くし、外気温が高い場合には出湯配管４中の湯温の低下速度が遅いので、循環運転の時間間隔を長くする。外気温に基づいて、循環運転の時間間隔を調整するので、外気温が変動しても即湯を効率良く行なうことができる。 (Second Embodiment)
A hot water supply system according to a second embodiment of the present invention will be described. The hot water supply system of the present embodiment includes a temperature sensor 8 that detects an outside air temperature. The control unit 6 performs the circulating operation at predetermined time intervals. Then, based on the outside air temperature detected by the temperature sensor 8, when the outside air temperature is low, the rate of decrease in the hot water temperature in the tap water piping 4 is fast, so the time interval of the circulation operation is shortened and the outside air temperature is high. Since the decreasing rate of the hot water temperature in the hot water supply pipe 4 is slow, the time interval of the circulation operation is lengthened. Since the time interval of the circulation operation is adjusted based on the outside air temperature, instant hot water can be efficiently performed even if the outside air temperature fluctuates.

なお、本発明は、上記各種実施形態の構成に限られず、発明の趣旨を変更しない範囲で種々の変形が可能である。例えば、第１の実施形態の給湯システム１において、出湯配管４内の湯温を検出し、湯温が所定の温度より低くなると循環運転を行なうようにしてもよい。また、給湯器２への給水経路に流量計を設け、一定時間での給水量が所定量を超えない場合に循環運転を行なうようにしてもよい。出湯口３からの出湯が一定時間以上行なわれない場合に循環運転を行なうのと同等の効果を得ることができる。出湯配管４の内容積は、給湯機２との接続箇所から戻し配管５との分岐箇所までの内容積でもよい。出湯配管４の内容積を給湯機２との接続箇所から出湯口３との接合箇所までとする場合と同様の効果を得ることができる。 In addition, this invention is not restricted to the structure of the said various embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, in the hot water supply system 1 of the first embodiment, the hot water temperature in the hot water discharge pipe 4 may be detected, and the circulating operation may be performed when the hot water temperature becomes lower than a predetermined temperature. Further, a flow meter may be provided in the water supply path to the hot water heater 2, and the circulation operation may be performed when the amount of water supply in a certain time does not exceed a predetermined amount. An effect equivalent to that of circulating operation can be obtained when the hot water from the hot water outlet 3 is not discharged for a certain period of time. The internal volume of the hot water supply piping 4 may be the internal volume from the connection location with the hot water supply device 2 to the branch location with the return piping 5. The same effect as the case where the internal volume of the hot water supply piping 4 is made from the connection location with the hot water heater 2 to the joint location with the hot water outlet 3 can be obtained.

本発明の第１の実施形態に係る給湯システムの構成図。The lineblock diagram of the hot-water supply system concerning a 1st embodiment of the present invention. 本発明の第２の実施形態に係る給湯システムの構成図。The block diagram of the hot-water supply system which concerns on the 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１給湯システム
２給湯機
４出湯配管
５戻し配管
５１送湯ポンプ
６制御部
６１内容積保持部
７循環経路
８温度センサ DESCRIPTION OF SYMBOLS 1 Hot-water supply system 2 Hot-water supply machine 4 Hot-water supply piping 5 Return piping 51 Hot-water supply pump 6 Control part 61 Internal volume holding part 7 Circulation path 8 Temperature sensor

Claims

湯を沸かし上げる給湯機と、前記給湯機により沸かし上げられた湯を出湯する出湯配管と、前記出湯配管から分岐して前記給湯機に接続され前記出湯配管中の湯を前記給湯機に戻す戻し配管と、前記出湯配管と戻し配管よりなる循環経路に前記給湯機により沸かし上げられた湯を循環させる循環運転を行う送湯ポンプと、前記給湯機と送湯ポンプを制御する制御部と、を備えた給湯システムにおいて、
前記制御部は、前記出湯配管の内容積の値が入力される内容積保持部を備え、
前記内容積の値に基づき前記循環運転の運転時間長を定め、
前記循環運転を所定のタイミングで行い、前記出湯配管中の湯を前記給湯機により沸かし上げられた湯と置換することを特徴とする給湯システム。 A water heater for boiling water, a tapping pipe for tapping hot water boiled by the water heater, a branch from the tapping pipe and connected to the water heater to return the hot water in the tapping pipe to the water heater A hot water supply pump that performs a circulating operation of circulating hot water boiled up by the hot water heater in a circulation path composed of piping, the hot water supply pipe and a return pipe, and a control unit that controls the hot water heater and the hot water supply pump. In the hot water system provided,
The control unit includes an internal volume holding unit into which a value of the internal volume of the tapping pipe is input,
The operation time length of the circulation operation is determined based on the value of the internal volume,
A hot water supply system, wherein the circulation operation is performed at a predetermined timing, and hot water in the hot water supply pipe is replaced with hot water boiled up by the hot water heater.

外気温を検出する温度センサを備え、
前記制御部は、前記温度センサが検出した外気温に基づいて前記循環運転を所定の時間間隔毎に行うことを特徴とする請求項１に記載の給湯システム。 It has a temperature sensor that detects the outside temperature,
The hot water supply system according to claim 1, wherein the control unit performs the circulation operation at predetermined time intervals based on an outside air temperature detected by the temperature sensor.