JP5087417B2

JP5087417B2 - Hot water storage water heater

Info

Publication number: JP5087417B2
Application number: JP2008025385A
Authority: JP
Inventors: 佳広野村; 友明藤川; 猛彦西山; 真典上田
Original assignee: Corona Corp
Current assignee: Corona Corp
Priority date: 2008-02-05
Filing date: 2008-02-05
Publication date: 2012-12-05
Anticipated expiration: 2028-02-05
Also published as: JP2009186070A

Description

この発明は、貯湯タンク内の湯水を用いて浴槽内の浴槽水を昇温させる貯湯式給湯装置に関するものである。 The present invention relates to a hot water storage type hot water supply apparatus that raises the temperature of bathtub water in a bathtub using hot water in a hot water storage tank.

従来よりこの種の電気温水器やヒートポンプ貯湯式給湯装置においては、浴槽内の浴槽水の昇温指令があると、貯湯タンクに貯められた貯湯温水の温度を検出し、この貯湯温水温度が所定温度以上あれば貯湯タンク内に備えた風呂熱交換器に浴槽水を循環させて熱交換加熱する追い焚き運転により浴槽水の昇温を行い、検出した前記貯湯温水温度が所定温度より低ければ貯湯タンク内の上部の温水を浴槽に注湯する差し湯運転により浴槽水の昇温を行うものであった。（例えば、特許文献１参照。）
特開２００３−５００４８号公報 Conventionally, in this kind of electric water heater and heat pump hot water storage type hot water supply device, when there is a temperature increase command for the bathtub water in the bathtub, the temperature of the hot water stored in the hot water tank is detected, and this hot water temperature is set to a predetermined value. If the temperature is higher than the temperature, the temperature of the bath water is raised by a reheating operation in which the bath water is circulated in the bath heat exchanger provided in the hot water storage tank and heat exchange heating is performed. The temperature of the bathtub water was raised by a hot water operation in which hot water in the upper part of the tank was poured into the bathtub. (For example, refer to Patent Document 1.)
JP 2003-50048 A

ところでこの従来のものでは、浴槽内の浴槽水の昇温指令があった時、その時点で検出した前記貯湯温水温度が所定温度以上であれば追い焚き運転を行っているが、この熱交換加熱による追い焚き運転によって貯湯タンク内の熱量が減少し貯湯温水温度が下がり、追い焚き運転の途中で検出される前記貯湯温水温度が前記所定温度よりも低下した場合には、追い焚き運転の途中で差し湯運転に切り替わってしまう。そうすると、浴槽水を昇温させるために追い焚き運転と差し湯運転の両方を行わなければならず、貯湯タンク内は追い焚き運転により風呂熱交換器近傍の貯湯温水温度が低下し、その上、差し湯運転によって貯湯タンク上部の温水も浴槽に注湯して減少してしまうことになる。その結果、湯切れの可能性があるとして電力単価の高い昼間時間帯に加熱手段、例えばヒートポンプユニットが駆動し貯湯タンク内の湯水を沸き上げる沸き増し運転が行われ、ランニングコストが高くなり経済性が損なわれるという問題点を有するものであり、さらに、貯湯タンク内には追い焚き運転により中温水が生成され、この中温水が貯湯タンク内に貯まった状態でヒートポンプユニットによる湯水の沸き上げ、すなわち昼間時間帯の沸き増し運転や深夜時間帯の沸き上げ運転に入ると、中温水に対するヒートポンプユニットの加熱能力の低下が大きいため、エネルギー消費効率（以下、ＣＯＰとする）が低下するという問題点を有するものであった。 By the way, in this conventional one, when there is a temperature increase command for the bathtub water in the bathtub, a reheating operation is performed if the hot water temperature detected at that time is equal to or higher than a predetermined temperature. When the amount of heat in the hot water storage tank decreases due to the reheating operation of the hot water, the hot water temperature of the hot water storage decreases, and when the hot water temperature of the hot water storage detected during the reheating operation is lower than the predetermined temperature, Switch to hot water operation. Then, in order to raise the temperature of the bath water, both the reheating operation and the hot water operation must be performed, and the hot water storage temperature in the vicinity of the bath heat exchanger is lowered by the reheating operation in the hot water storage tank. Hot water at the top of the hot water storage tank is also poured into the bathtub and reduced by hot water operation. As a result, there is a possibility of running out of hot water, and heating means, for example, a heat pump unit is driven during the daytime hours when the unit price of electricity is high, and hot water in the hot water storage tank is heated to increase the running cost. In addition, medium temperature water is generated in the hot water storage tank by the reheating operation, and boiling of the hot water by the heat pump unit in a state where the intermediate temperature water is stored in the hot water storage tank, that is, There is a problem that the energy consumption efficiency (hereinafter referred to as COP) decreases when the heating operation of the heat pump unit with respect to the medium temperature water is greatly reduced when the heating operation of the daytime time zone or the midnight time zone is started. I had it.

この発明は上記課題を解決するために、特に請求項１ではその構成を、湯水を貯湯する貯湯タンクと、該貯湯タンク内の湯水を加熱する加熱手段と、前記貯湯タンクの貯湯温水の温度を検出する貯湯温度検出手段と、浴槽に接続される風呂循環回路と、前記浴槽の浴槽水を前記風呂循環回路に循環させる風呂循環ポンプと、前記風呂循環回路を循環する前記浴槽水を前記貯湯タンク内の湯水と熱交換させる風呂熱交換器と、前記風呂循環回路に接続され前記貯湯タンク内の湯水を前記浴槽へ注湯する湯張り管と、前記浴槽内の浴槽水の昇温時に、前記浴槽水を前記風呂熱交換器に循環して追い焚きする追い焚き運転か、前記湯張り管から前記貯湯タンク内の温水を前記風呂循環回路に注湯する差し湯運転のどちらかを行わせる昇温制御部とを備えた貯湯式給湯装置において、前記浴槽内の浴槽水の昇温開始時に、その時点の前記貯湯温度検出手段が検出する貯湯温水の温度と前記浴槽内の浴槽水の昇温に必要な追い焚き必要熱量とに基づいて、前記追い焚き運転後の前記貯湯タンク内の温水の温度分布を予測する温度分布予測手段と、昼間時間帯に前記貯湯タンク内の熱量が減少した時に前記加熱手段により前記貯湯タンク内の湯水を沸き増す沸き増し運転を開始する沸き増し開始条件を設定する沸き増し条件設定手段と、前記温度分布予測手段により予測された前記温度分布と前記沸き増し条件設定手段により設定された沸き増し開始条件とに基づいて、前記追い焚き運転を行うことで前記沸き増し運転が行われるかどうかを判定する沸き増し判定手段とを設け、前記浴槽内の浴槽水の昇温開始時に、前記温度分布予測手段で予測された前記温度分布が前記沸き増し開始条件に当てはまらず、前記沸き増し判定手段によって前記沸き増し運転が行われないと判定された場合、前記昇温制御部は前記追い焚き運転を行わせるようにし、前記浴槽内の浴槽水の昇温開始時に、前記温度分布予測手段で予測された前記温度分布が前記沸き増し開始条件に当てはまり、前記沸き増し判定手段によって前記沸き増し運転が行われると判定された場合、前記昇温制御部は前記差し湯運転を行わせるようにしたものである。 In order to solve the above-mentioned problems, the present invention is particularly configured as claimed in claim 1. The hot water storage tank for storing hot water, the heating means for heating the hot water in the hot water storage tank, and the temperature of the hot water stored in the hot water storage tank are as follows. Hot water storage temperature detection means for detecting, a bath circulation circuit connected to the bathtub, a bath circulation pump for circulating the bathtub water in the bathtub to the bath circulation circuit, and the bath water circulating in the bath circulation circuit for the hot water storage tank A bath heat exchanger for exchanging heat with the hot water in the bath, a hot water pipe connected to the bath circulation circuit for pouring hot water in the hot water storage tank into the bathtub, and when the temperature of the bathtub water in the bathtub is raised, An ascending operation that either circulates the bath water to the bath heat exchanger and reheats it or a hot water operation that pours hot water in the hot water storage tank from the hot water pipe into the bath circulation circuit. With the temperature controller In example was hot water storage type hot water supply apparatus, when the tub initiation Atsushi Nobori water in the bathtub, a reheating required required the hot water storage temperature detecting means and the temperature of the hot water storage hot water detected by the bath water Atsushi Nobori in said bath at that time based on the amount of heat, and the temperature distribution estimating means for estimating the hot water temperature distribution in the hot water storage tank after the reheating operation, Ri by said heating means when the amount of heat of the hot water storage tank is reduced to daytime The heating condition setting means for setting the heating start condition for starting the heating increase operation for boiling the hot water in the hot water storage tank, the temperature distribution predicted by the temperature distribution prediction means, and the heating condition setting means are set. based on the has been additional boiling start condition, and a reheating determining means for determining whether said reheating operation by performing the reheating operation is performed provided, bath in the bath When it is determined that the temperature distribution predicted by the temperature distribution prediction unit does not apply to the boiling increase start condition and the boiling increase determination unit does not perform the boiling increase operation at the start of water temperature increase, The temperature increase control unit causes the reheating operation to be performed, and at the start of temperature increase of the bath water in the bathtub, the temperature distribution predicted by the temperature distribution prediction unit applies to the boiling start condition, and the boiling When it is determined by the increase determination means that the reheating operation is performed, the temperature increase control unit is configured to perform the hot water operation.

又請求項２では、前記追い焚き必要熱量を、前記浴槽内の水位と、前記浴槽内の浴槽水の温度と、前記追い焚き運転により前記浴槽内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出するようにした。 According to a second aspect of the present invention, the amount of heat required for reheating is set such that the water level in the bathtub, the temperature of the bathtub water in the bathtub, and the temperature of the bathtub water in the bathtub are increased by the reheating operation. It was calculated based on the reheating target temperature that is the temperature.

又請求項３では、前記追い焚き必要熱量を、所定の浴槽水量と、前記浴槽内の浴槽水の温度と、前記追い焚き運転により前記浴槽内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出するようにした。 Further, in claim 3, the amount of heat required for reheating is set to a predetermined bath water amount, a temperature of the bath water in the bathtub, and a target temperature to increase the temperature of the bath water in the bathtub by the reheating operation. It was calculated based on the reheating target temperature.

この発明の請求項１によれば、浴槽内の浴槽水の昇温時に、追い焚き運転後の前記貯湯タンク内の温水の温度分布を予測すると共に、追い焚き運転を行うことにより昼間時間帯に沸き増し運転が行われるかどうかを判定し、沸き増し運転が行われないと判定された場合には、前記昇温制御部は追い焚き運転を行うようにしたことで、電力単価の高い昼間時間帯に沸き増し運転が行われることなく追い焚き運転により良好に浴槽水の昇温ができ、一方、沸き増し運転が行われると判定された場合には、差し湯運転を行うようにしたことで、差し湯運転により良好に浴槽水の昇温ができると共に、事前に中温水の生成を回避できるため、加熱手段による貯湯タンク内の湯水の沸き上げ、すなわち昼間時間帯の沸き増し運転や深夜時間帯の沸き上げ運転時のＣＯＰを向上させることができるものであり、さらに、浴槽内の浴槽水の昇温開始時から差し湯運転を行うことで、追い焚き運転を行った場合のように貯湯タンク内の湯水が広範囲に温度低下することがなく、電力単価の高い昼間時間帯に沸き増し運転が行われる頻度を減少させることができ、ランニングコストを抑え経済性を向上させることができるものである。 According to the first aspect of the present invention, the temperature distribution of the hot water in the hot water storage tank after the reheating operation is predicted when the temperature of the bath water in the bathtub is increased, and the reheating operation is performed in the daytime period. It is determined whether or not the reheating operation is performed, and when it is determined that the reheating operation is not performed, the temperature increase control unit performs the reheating operation so that the daytime time when the power unit price is high. The bath water temperature can be increased satisfactorily by the reheating operation without performing the reheating operation in the belt, while the hot water operation is performed when it is determined that the reheating operation is performed. The bath water can be heated well by hot water operation, and the generation of intermediate temperature water can be avoided in advance. Boil up the belt The COP at the time of turning can be improved, and further, the hot water in the hot water storage tank as in the case of the reheating operation is performed by performing the hot water operation from the start of the temperature rise of the bathtub water in the bathtub. However, the temperature does not decrease over a wide range, the frequency of heating up during the daytime hours when the unit price of electricity is high can be reduced, the running cost can be reduced, and the economy can be improved.

又請求項２によれば、追い焚き必要熱量を、浴槽内の水位と、浴槽内の浴槽水の温度と、追い焚き運転により浴槽内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出するようにしたので、追い焚き運転後の貯湯タンク内の貯湯温水の温度をほぼ正確に予測することができるものである。 Further, according to claim 2, the amount of heat required for reheating is the water level in the bathtub, the temperature of the bathtub water in the bathtub, and the target temperature for increasing the temperature of the bathtub water in the bathtub by the reheating operation. Since the calculation is based on the reheating target temperature, the temperature of the hot water in the hot water storage tank after the reheating operation can be predicted almost accurately.

又請求項３によれば、追い焚き必要熱量を、所定の浴槽水量と、浴槽内の浴槽水の温度と、前記追い焚き運転により前記浴槽内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出するようにしたので、追い焚き運転後の貯湯タンク内の貯湯温水の温度をほぼ正確に予測することができ、前記所定の浴槽水量を用いることで、追い焚き必要熱量を簡単に算出することができるものである。 Further, according to claim 3, the amount of heat required for reheating is set to a predetermined bath water amount, a temperature of the bath water in the bathtub, and a target temperature for raising the temperature of the bath water in the bathtub by the reheating operation. Therefore, the temperature of hot water in the hot water storage tank after the reheating operation can be predicted almost accurately, and by using the predetermined amount of bath water, The amount of heat required for reheating can be easily calculated.

次に、本発明の一実施形態を図面に基づき説明する。
この貯湯式給湯装置は、時間帯別契約電力の電力単価が安価な深夜時間帯に湯水を沸き上げて貯湯し、この貯湯した湯水を給湯等に用いるもので、１は湯水を貯湯する貯湯タンク２を備えた貯湯タンクユニット、３は貯湯タンク２内の湯水を加熱する加熱手段としてのヒートポンプユニット、４は台所や洗面所等に設けられた給湯栓、５はこの貯湯式給湯装置を遠隔操作するリモコン、６は浴槽である。なお、この実施形態では貯湯タンク２の容量を４６０Ｌとする。 Next, an embodiment of the present invention will be described with reference to the drawings.
This hot water storage type hot water supply device boils and stores hot water in the midnight hours when the unit price of contracted power by time is low, and uses the hot water stored for hot water supply. 1 is a hot water storage tank for storing hot water. 2 is a hot water storage tank unit, 3 is a heat pump unit as a heating means for heating hot water in the hot water storage tank 2, 4 is a hot water tap provided in a kitchen or a washroom, and 5 is a remote control of this hot water storage type hot water supply device A remote controller 6 is a bathtub. In this embodiment, the hot water storage tank 2 has a capacity of 460L.

前記貯湯タンクユニット１の貯湯タンク２は、上端に出湯管７と、下端に給水管８とが接続され、さらに下部にヒーポン循環回路９を構成するヒーポン往き管１０と、上部にヒーポン循環回路９を構成するヒーポン戻り管１１とが接続され、ヒーポン往き管１０から取り出した貯湯タンク２内の湯水をヒートポンプユニット３によって沸き上げてヒーポン戻り管１１から貯湯タンク２内に戻して貯湯され、給水管８からの給水により貯湯タンク２内の湯水が押し上げられて貯湯タンク２上部の高温水が出湯管７から押し出されて給湯されるものである。 The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 7 connected to the upper end, a water supply pipe 8 connected to the lower end, a heat pump forward pipe 10 constituting a heat pump circulation circuit 9 at the lower part, and a heat pump circulation circuit 9 at the upper part. The hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 10 is boiled up by the heat pump unit 3 and returned to the hot water storage tank 2 from the heat pump return pipe 11 to be stored in the hot water supply pipe. The hot water in the hot water storage tank 2 is pushed up by the water supply from 8, and the hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 7 to supply hot water.

前記ヒートポンプユニット３は、冷媒を圧縮する回転数可変の圧縮機１２と、凝縮器としての水冷媒熱交換器１３と、減圧手段としての電子膨張弁１４と、強制空冷式の蒸発器としての空気熱交換器１５とで構成されたヒートポンプ回路１６と、前記ヒーポン往き管１０に設けられ貯湯タンク２内の湯水を水冷媒熱交換器１３に循環させるヒーポン循環ポンプ１７と、それらの駆動を制御するヒーポン制御部１８とを備えており、ヒートポンプ回路１６内には冷媒として二酸化炭素が用いられて超臨界ヒートポンプサイクルを構成しているものである。 The heat pump unit 3 includes a compressor 12 having a variable rotation speed for compressing refrigerant, a water refrigerant heat exchanger 13 as a condenser, an electronic expansion valve 14 as decompression means, and air as a forced air-cooled evaporator. A heat pump circuit 16 composed of a heat exchanger 15, a heat pump circulation pump 17 provided in the heat pump forward pipe 10 for circulating hot water in the hot water storage tank 2 to the water-refrigerant heat exchanger 13, and driving thereof are controlled. A heat pump control unit 18 is provided, and carbon dioxide is used as a refrigerant in the heat pump circuit 16 to constitute a supercritical heat pump cycle.

ここで、前記水冷媒熱交換器１３は冷媒と被加熱水たる貯湯タンク２内の湯水とが対向して流れる対向流方式を採用しており、超臨界ヒートポンプサイクルでは熱交換時において冷媒は超臨界状態のまま凝縮されるため効率よく高温まで被加熱水を加熱することができ、被加熱水の水冷媒熱交換器１３入口温度と冷媒の出口温度との温度差が一定になるように電子膨張弁１４または圧縮機１２を制御することでＣＯＰがとても良い状態で被加熱水を加熱することが可能なものである。 Here, the water-refrigerant heat exchanger 13 employs a counter flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water face each other. In the supercritical heat pump cycle, the refrigerant is super The water to be heated can be efficiently heated to a high temperature because it is condensed in a critical state, and the temperature difference between the water refrigerant heat exchanger 13 inlet temperature and the refrigerant outlet temperature is constant. By controlling the expansion valve 14 or the compressor 12, the water to be heated can be heated with a very good COP.

１９は前記浴槽６内の浴槽水を加熱するためのステンレス製の蛇管よりなる風呂熱交換器で貯湯タンク２内の上部に配置されるもので、この風呂熱交換器１９には、風呂循環ポンプ２０を備え浴槽６内の浴槽水を風呂熱交換器１９に流す風呂往き管２１及び風呂熱交換器１９を通過した浴槽水を浴槽６内に流す風呂戻り管２２よりなる風呂循環回路２３が接続されて、浴槽６内の浴槽水が循環可能にされ、浴槽６内の浴槽水が貯湯タンク２内の高温水により加熱されて追い焚き運転が行われるものである。 19 is a bath heat exchanger composed of a stainless steel snake pipe for heating the bath water in the bathtub 6 and is arranged at the upper part of the hot water storage tank 2. The bath heat exchanger 19 includes a bath circulation pump. A bath circulation circuit 23 comprising a bath return pipe 21 for flowing the bathtub water in the bathtub 6 and the bath return pipe 21 for flowing the bathtub water in the bathtub 6 to the bath heat exchanger 19 and the bath heat exchanger 19 is connected. Thus, the bathtub water in the bathtub 6 can be circulated, and the bathtub water in the bathtub 6 is heated by the high-temperature water in the hot water storage tank 2 to perform the reheating operation.

２４は流水の有無を検知する流水スイッチ、２５は風呂往き管２１に設けられ浴槽６から流出し風呂熱交換器１９に流入する浴槽水の温度を検出する風呂温度センサ、２６は浴槽水の水圧から浴槽６内の水位を検出する水位検出手段としての水位センサである。 24 is a water flow switch for detecting the presence or absence of running water, 25 is a bath temperature sensor for detecting the temperature of bath water flowing out of the bathtub 6 and flowing into the bath heat exchanger 19 provided in the bath outlet pipe 21, and 26 is water pressure of the bath water. It is a water level sensor as a water level detection means which detects the water level in bathtub 6 from.

２７は風呂熱交換器１９をバイパスして風呂往き管２１と風呂戻り管２２とを接続する
バイパス管で、このバイパス管２７と風呂往き管２１との接続部分には、浴槽６からの浴槽水を風呂熱交換器１９側に循環させるか、バイパス管２７側に循環させるかを切り替える風呂三方弁２８が備えられているものである。 Reference numeral 27 denotes a bypass pipe that bypasses the bath heat exchanger 19 and connects the bath outlet pipe 21 and the bath return pipe 22. The connecting portion between the bypass pipe 27 and the bath outlet pipe 21 includes bath water from the bathtub 6. Is provided with a bath three-way valve 28 for switching between circulation to the bath heat exchanger 19 side and circulation to the bypass pipe 27 side.

２９は貯湯タンク２の中間位置に接続された中温水出湯管で、前記風呂熱交換器１９で浴槽水と熱交換して温度低下した中温水や、湯と水との境界層付近で熱移動により温度低下あるいは温度上昇した中温水等の貯湯タンク２の中間位置に貯湯されている湯水を貯湯タンク２から出湯させるものである。 29 is an intermediate temperature hot water discharge pipe connected to an intermediate position of the hot water storage tank 2. Heat transfer is performed in the vicinity of the boundary layer between the hot water and water, and the intermediate temperature water whose temperature has been lowered by heat exchange with the bath water in the bath heat exchanger 19. The hot water stored in the intermediate position of the hot water storage tank 2 such as intermediate hot water whose temperature has been lowered or increased due to the hot water is discharged from the hot water storage tank 2.

３０は出湯管７途中で中温水出湯管２９の下流に設けられた電動ミキシング弁より構成された中温水混合弁、３１はこの中温水混合弁３０下流の中間給湯管３２に設けられた中間温度センサで、貯湯タンク２中間位置付近の中温水と貯湯タンク２上端に接続された出湯管７からの高温水とをリモコン５でユーザーが設定した給湯設定温度より所定温度高い混合目標温度になるように中温水混合弁３０の弁体（図示せず）の弁開度が調整され混合比率が制御されるものである。 Reference numeral 30 denotes an intermediate warm water mixing valve constituted by an electric mixing valve provided in the middle of the hot water discharge pipe 7 and downstream of the intermediate hot water hot water supply pipe 29, and reference numeral 31 denotes an intermediate temperature provided in an intermediate hot water supply pipe 32 downstream of the intermediate hot water mixing valve 30. With the sensor, the middle temperature water near the intermediate position of the hot water storage tank 2 and the high temperature water from the hot water discharge pipe 7 connected to the upper end of the hot water storage tank 2 are set to a mixing target temperature that is higher by a predetermined temperature than the hot water supply set temperature set by the user with the remote controller 5. In addition, the valve opening degree of the valve body (not shown) of the intermediate temperature water mixing valve 30 is adjusted to control the mixing ratio.

３３は中温水混合弁３０からの湯水と給水管８から分岐された給水バイパス管３４からの給水とを混合する電動ミキシング弁より構成された給湯混合弁であり、その下流の給湯管３５に設けた給湯温度センサ３６で検出した湯温がリモコン５でユーザーが設定した給湯設定温度になるように給湯混合弁３３の弁体（図示せず）の弁開度が調整され混合比率が制御されるものである。 Reference numeral 33 denotes a hot water mixing valve composed of an electric mixing valve for mixing hot water from the intermediate temperature water mixing valve 30 and water from the water supply bypass pipe 34 branched from the water supply pipe 8. The opening degree of the valve body (not shown) of the hot water mixing valve 33 is adjusted so that the hot water temperature detected by the hot water temperature sensor 36 becomes the hot water setting temperature set by the user with the remote controller 5 and the mixing ratio is controlled. Is.

３７は給湯管３５から分岐され風呂循環回路２３の風呂往き管２１に接続され浴槽６への注湯を行う湯張り管で、この湯張り管３７には、浴槽６への注湯の開始／停止を行う湯張り弁３８と、浴槽６への注湯量をカウントする風呂流量カウンタ３９と、浴槽６の浴槽水が逆流するのを防止する二重に配設した逆止弁４０とが設けられているものである。 Reference numeral 37 denotes a hot water pipe that branches off from the hot water supply pipe 35 and is connected to the bath outlet pipe 21 of the bath circulation circuit 23 for pouring hot water into the bathtub 6. A hot water filling valve 38 for stopping, a bath flow rate counter 39 for counting the amount of pouring water into the bathtub 6, and a check valve 40 provided in duplicate for preventing the bath water in the bathtub 6 from flowing backward are provided. It is what.

４１は貯湯タンク２の上下方向に複数個配置された貯湯温度検出手段としての貯湯温度センサで、この実施形態では７つの貯湯温度センサ、上から順に４１ａ（３０Ｌ位置）、４１ｂ（１１０Ｌ位置）、４１ｃ（１７０Ｌ位置）、４１ｄ（２３０Ｌ位置）、４１ｅ（２９０Ｌ位置）、４１ｆ（３５０Ｌ位置）、４１ｇ（４１０Ｌ位置）が配置されているものであり、この貯湯温度センサ４１が検出する温度情報によって、貯湯タンク２内にどれだけの熱量が残っているかを検知し、そして貯湯タンク２内の上下方向の貯湯温水の温度分布を検知するものである。 41 is a hot water storage temperature sensor as hot water storage temperature detection means arranged in the vertical direction of the hot water storage tank 2, in this embodiment seven hot water storage temperature sensors, 41a (30L position), 41b (110L position) in order from the top, 41c (170L position), 41d (230L position), 41e (290L position), 41f (350L position), and 41g (410L position) are arranged. According to the temperature information detected by the hot water storage temperature sensor 41, The amount of heat remaining in the hot water storage tank 2 is detected, and the temperature distribution of the hot water storage water in the vertical direction in the hot water storage tank 2 is detected.

前記リモコン５には、給湯設定温度を設定する給湯温度設定スイッチ４２、及び風呂設定温度を設定する風呂温度設定スイッチ４３が設けられていると共に、浴槽６へ風呂設定温度の湯をリモコン５の湯張り量設定スイッチ（図示せず）で設定された湯張り量だけ湯張りし所定時間保温させる風呂自動スイッチ４４と、浴槽６内の浴槽水を昇温させるあつめスイッチ４５が設けられているものである。 The remote controller 5 is provided with a hot water supply temperature setting switch 42 for setting the hot water supply set temperature and a bath temperature setting switch 43 for setting the bath set temperature. An automatic bath switch 44 that fills the hot water by a hot water amount set by a stretch amount setting switch (not shown) and keeps it warm for a predetermined period of time, and a gather switch 45 that raises the temperature of the bath water in the bathtub 6 are provided. is there.

４６はヒートポンプユニット３の駆動開始・停止制御や各センサの入力を受け各アクチュエータの駆動を制御するマイコンを有する制御手段としての貯湯制御部である。この貯湯制御部４６は、浴槽６内の浴槽水を昇温する時、すなわちリモコン５のあつめスイッチ４５が操作された時に、貯湯温度センサ４１が検出する貯湯温水の温度をチェックし、風呂熱交換器１９近傍の貯湯温水の温度が熱交換に最低限必要と考えられる所定温度より高いかどうかを判定し、前記所定温度より高ければ、浴槽水を風呂熱交換器１９に循環して貯湯タンク２内の温水と浴槽水とを熱交換加熱することで追い焚きする追い焚き運転か、湯張り管３７から貯湯タンク２内の高温水を風呂循環回路２３に注湯する差し湯運転のどちらかを行わせる昇温制御部４７を有するものである。 Reference numeral 46 denotes a hot water storage control unit as a control means having a microcomputer that controls the driving start / stop of the heat pump unit 3 and the input of each sensor and controls the driving of each actuator. The hot water storage control unit 46 checks the temperature of the hot water stored in the hot water detected by the hot water temperature sensor 41 when the temperature of the bathtub water in the bathtub 6 is raised, that is, when the adjustment switch 45 of the remote controller 5 is operated, and bath heat exchange is performed. It is determined whether or not the temperature of the hot water stored in the vicinity of the vessel 19 is higher than a predetermined temperature that is considered to be necessary for heat exchange. If the temperature is higher than the predetermined temperature, the bath water is circulated to the bath heat exchanger 19 and the hot water storage tank 2 Either the reheating operation in which the hot water and the bathtub water are reheated by heat exchange heating, or the hot water operation in which the hot water in the hot water storage tank 2 is poured from the hot water pipe 37 into the bath circulation circuit 23. It has the temperature raising control part 47 to be performed.

前記昇温制御部４７は前記追い焚き運転後の貯湯タンク２内の温水の温度分布を予測する温度分布予測手段４８と、昼間時間帯に貯湯タンク２内の熱量が減少した時にヒートポンプユニット３による沸き増し運転を開始する沸き増し開始条件を設定する沸き増し条件設定手段４９と、温度分布予測手段４８により予測された温度分布と沸き増し条件設定手段４９により設定された沸き増し開始条件とに基づいて、前記予測された温度分布が前記沸き増し開始条件に当てはまるかどうか比較し、前記追い焚き運転が行われた結果、沸き増し運転が行われるかどうかを判定する沸き増し判定手段５０とを有しているものである。 The temperature raising control unit 47 uses a temperature distribution predicting means 48 for predicting the temperature distribution of the hot water in the hot water storage tank 2 after the reheating operation, and the heat pump unit 3 when the amount of heat in the hot water storage tank 2 decreases during the daytime. Based on the heating condition setting means 49 for setting the heating start condition for starting the heating operation, the temperature distribution predicted by the temperature distribution prediction means 48, and the heating start condition set by the heating condition setting means 49. And a boiling increase determination means 50 for comparing whether or not the predicted temperature distribution meets the boiling start condition and determining whether or not the boiling increase operation is performed as a result of the reheating operation. It is what you are doing.

前記温度分布予測手段４８は、以下に示す方法で追い焚き運転後の貯湯タンク２内の貯湯温水の温度分布を予測するものである。先ず、追い焚き運転に必要な追い焚き必要熱量を次式により算出する。
追い焚き必要熱量Ｑ１＝浴槽水量Ｌ１×昇温温度Ｔ１
＝（浴槽断面積×水位）×（追い焚き目標温度−浴槽水温度）
…（式１）
ここで、浴槽水量Ｌ１は、試運転時などに予め記憶した浴槽６の断面積と、浴槽水の昇温時に水位センサ２６で検出した水位とを掛けることにより算出され、昇温温度Ｔ１は風呂温度設定スイッチ４３で設定した風呂設定温度や風呂温度センサ２５で検出される浴槽６内の浴槽水の温度等に基づき設定される浴槽水を昇温させようとする目標温度である追い焚き目標温度から、浴槽水の昇温時に風呂温度センサ２５で検出される浴槽水の温度を引くことにより算出されるものである。なお、前記追い焚き目標温度は、浴槽水の温度が低い場合は風呂設定温度に設定し、浴槽水の温度が風呂設定温度に近い場合には現在の浴槽水の温度に対して２℃程度高い温度に設定するものである。 The temperature distribution predicting means 48 predicts the temperature distribution of the hot water stored in the hot water storage tank 2 after the reheating operation by the following method. First, the amount of heat required for reheating is calculated by the following equation.
Reheating required heat amount Q1 = bath water amount L1 × temperature increase temperature T1
= (Tubing cross section x water level) x (reheating target temperature-bath water temperature)
... (Formula 1)
Here, the bathtub water amount L1 is calculated by multiplying the cross-sectional area of the bathtub 6 stored in advance during the trial operation and the water level detected by the water level sensor 26 when the bathtub water is heated, and the temperature increase temperature T1 is the bath temperature. From the reheating target temperature, which is the target temperature for increasing the bath water set based on the bath set temperature set by the setting switch 43, the bath water temperature in the bath 6 detected by the bath temperature sensor 25, and the like. The temperature is calculated by subtracting the temperature of the bathtub water detected by the bath temperature sensor 25 when the temperature of the bathtub water rises. The reheating target temperature is set to the bath set temperature when the bath water temperature is low, and is about 2 ° C. higher than the current bath water temperature when the bath water temperature is close to the bath set temperature. The temperature is set.

次に、温度分布予測手段４８は、追い焚き運転により奪われる熱量を、貯湯温度センサ４１で検出する風呂熱交換器１９近傍の温水温度と、温度検出する風呂熱交換器１９近傍の容量とから風呂熱交換器１９（蛇管）部分の熱量を次式により算出する。
蛇管位置熱量Ｑ２＝蛇管位置平均温度Ｔ２×蛇管位置容量Ｌ２
＝（（貯湯温度センサ４１ｂ検出温度＋貯湯温度センサ４１ｃ検出温度）／２） ×（貯湯温度センサ４１ｃ位置容量−貯湯温度センサ４１ｂ位置容量）
…（式２）
ここで、蛇管位置平均温度Ｔ２は、風呂熱交換器１９近傍の貯湯温度センサ４１ｂ及び貯湯温度センサ４１ｃで検出する温水の温度の平均温度をとったもので、蛇管位置容量Ｌ２は、貯湯温度センサ４１ｃが配設された１７０Ｌ位置から貯湯温度センサ４１ｂが配設された１１０Ｌ位置を引いた所定の容量、つまり６０Ｌを指すものである。 Next, the temperature distribution predicting means 48 calculates the amount of heat taken by the reheating operation from the hot water temperature in the vicinity of the bath heat exchanger 19 detected by the hot water storage temperature sensor 41 and the capacity in the vicinity of the bath heat exchanger 19 to detect the temperature. The amount of heat in the bath heat exchanger 19 (conduit) portion is calculated by the following equation.
Serpentine tube position calorie Q2 = meander tube position average temperature T2 x serpentine tube position capacity L2
= ((Detected temperature of hot water storage temperature sensor 41b + detected temperature of hot water storage temperature sensor 41c) / 2) × (position capacity of hot water storage temperature sensor 41c−position capacity of hot water storage temperature sensor 41b)
... (Formula 2)
Here, the meandering tube position average temperature T2 is the average temperature of hot water detected by the hot water storage temperature sensor 41b and the hot water storage temperature sensor 41c in the vicinity of the bath heat exchanger 19, and the meandering tube position capacity L2 is the hot water storage temperature sensor. This indicates a predetermined capacity obtained by subtracting the 110L position where the hot water storage temperature sensor 41b is provided from the 170L position where 41c is provided, that is, 60L.

次に、温度分布予測手段４８は、追い焚き運転により奪われた風呂熱交換器１９（蛇管）部分の熱量を次式により算出する。
追い焚き運転後蛇管位置熱量Ｑ３＝蛇管位置熱量Ｑ２−追い焚き必要熱量Ｑ１
…（式３） Next, the temperature distribution predicting means 48 calculates the amount of heat of the bath heat exchanger 19 (coiled pipe) portion taken away by the chasing operation by the following equation.
After the reheating operation, the heat quantity Q3 of the helical tube Q = the heat quantity of the helical tube Q2-the necessary heat quantity Q1
... (Formula 3)

次に、温度分布予測手段４８は、追い焚き運転後の風呂熱交換器１９（蛇管）部分、つまり貯湯温度センサ４１ｂ及び貯湯温度センサ４１ｃの平均温度を次式により算出する。
追い焚き運転後蛇管位置平均温度Ｔ３
＝追い焚き運転後蛇管位置熱量Ｑ３／蛇管位置容量Ｌ２
…（式４）
以上、（式１）〜（式４）により温度分布予測手段４８は、浴槽６内の浴槽水の昇温開始時に貯湯温度センサ４１が検出した貯湯温水の温度と、浴槽６内の浴槽水の昇温に必要な追い焚き必要熱量とに基づいて追い焚き運転後の貯湯タンク２内の風呂熱交換器１９近傍の温水の温度を予測し、最後に、浴槽６内の浴槽水の昇温開始時に貯湯温度センサ４１が検出した温水の温度のうち、貯湯温度センサ４１ｂ及び貯湯温度センサ４１ｃで検出した温度のところに（式４）で算出した結果を代入することで、追い焚き運転後の貯湯タンク２内の温水の温度分布を予測するものである。なお、（式１）〜（式４）をまとめると次式が導出されるので、この式を用いて、追い焚き運転後の貯湯タンク２内の風呂熱交換器１９近傍の温水の温度を予測してもよいものである。
追い焚き運転後蛇管位置平均温度Ｔ３
＝蛇管位置平均温度Ｔ２−追い焚き必要熱量Ｑ１／蛇管位置容量Ｌ２
…（式５） Next, the temperature distribution predicting means 48 calculates the average temperature of the bath heat exchanger 19 (coiled tube) portion after the reheating operation, that is, the hot water storage temperature sensor 41b and the hot water storage temperature sensor 41c, by the following equation.
After the chasing operation, the mean position temperature T3
= After-running operation, the position of the coiled pipe position Q3 / capacitor position capacity L2
... (Formula 4)
As described above, according to (Expression 1) to (Expression 4), the temperature distribution predicting means 48 detects the temperature of the hot water storage hot water detected by the hot water storage temperature sensor 41 at the start of the temperature increase of the bath water in the bathtub 6 and the bath water in the bathtub 6. The temperature of the hot water near the bath heat exchanger 19 in the hot water storage tank 2 after the reheating operation is predicted on the basis of the reheating required heat amount necessary for the temperature increase, and finally the temperature rise of the bath water in the bathtub 6 is started. Of the hot water temperatures detected by the hot water storage temperature sensor 41, the result calculated by (Equation 4) is substituted for the temperature detected by the hot water storage temperature sensor 41b and the hot water storage temperature sensor 41c, so that the hot water storage after the reheating operation is performed. The temperature distribution of the hot water in the tank 2 is predicted. In addition, since (Formula 1)-(Formula 4) are put together, the following formula is derived. Using this formula, the temperature of hot water near the bath heat exchanger 19 in the hot water storage tank 2 after the reheating operation is predicted. You may do it.
After the chasing operation, the mean position temperature T3
= Temperature tube position average temperature T2-Reheating required heat quantity Q1 / Temperature tube position capacity L2
... (Formula 5)

前記沸き増し条件設定手段４９は、昼間時間帯に貯湯温度センサ４１、例えば貯湯温度センサ４１ｃの検出する温度が所定温度以下となったこと、または、貯湯温度センサ４１の検出する温度から算出される残湯量が所定の残湯量以下となったことを、ヒートポンプユニット３により貯湯タンク２内の湯水を沸き増す沸き増し運転の開始条件として設定したり、所定期間内に追い焚き運転を行ったことを記憶していなかったら貯湯温度センサ４１ｃの検出する温度が第１所定温度以下となったことを沸き増し運転の開始条件として設定したり、前記所定期間内に追い焚き運転を行ったことを記憶していたら貯湯温度センサ４１の検出する温度が前記第１所定温度より高い第２所定温度以下となったことを沸き増し運転の開始条件として設定する等、沸き増し運転の沸き増し開始条件を状況に応じて適宜設定するものである。 The boiling increase condition setting means 49 is calculated from the temperature detected by the hot water storage temperature sensor 41, for example, the hot water storage temperature sensor 41c, being lower than a predetermined temperature during the daytime period, or from the temperature detected by the hot water storage temperature sensor 41. The fact that the remaining hot water amount is equal to or less than the predetermined remaining hot water amount is set as a start condition for the reheating operation in which the hot water in the hot water storage tank 2 is boiled by the heat pump unit 3, or the reheating operation is performed within a predetermined period. If it is not stored, the fact that the temperature detected by the hot water storage temperature sensor 41c is equal to or lower than the first predetermined temperature is set as the start condition of the reheating operation, or the reheating operation is performed within the predetermined period. If so, the fact that the temperature detected by the hot water storage temperature sensor 41 is equal to or lower than the second predetermined temperature higher than the first predetermined temperature is set as a condition for starting the heating operation. Etc., it should be appropriately set according to according to additional boiling reheating conditions for starting the driving to the situation.

５１は貯湯タンク２の過圧を逃す過圧逃し弁、５２は給水の圧力を減圧する減圧弁、５３は給水の温度を検出する給水温度センサ、５４は給湯する湯水の量をカウントする給湯流量カウンタである。 51 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 52 is a pressure reducing valve for reducing the pressure of the water supply, 53 is a water supply temperature sensor for detecting the temperature of the water supply, and 54 is a hot water supply flow rate for counting the amount of hot water supplied. It is a counter.

次に、この一実施形態の作動について説明する。
先ず、沸き上げ運転について説明すると、深夜電力時間帯になって貯湯温度センサ４１が貯湯タンク２内に翌日に必要な熱量が残っていないことを検知すると、貯湯制御部４６はヒーポン制御部１８に対して沸き上げ開始指令を発する。指令を受けたヒーポン制御部１８は圧縮機１２を起動した後にヒーポン循環ポンプ１７を駆動開始し、貯湯タンク２下部に接続されたヒーポン往き管１０から取り出した低温水を水冷媒熱交換器１３で高温に加熱し、貯湯タンク２上部に接続されたヒーポン戻り管１１から貯湯タンク２内に戻し、貯湯タンク２の上部から順次積層して高温水を貯湯していく。貯湯温度センサ４１が必要な熱量が貯湯されたことを検出すると、貯湯制御部４６はヒーポン制御部１８に対して沸き上げ停止指令を発し、ヒーポン制御部１８は圧縮機１２を停止すると共にヒーポン循環ポンプ１７も停止して沸き上げ運転を終了するものである。 Next, the operation of this embodiment will be described.
First, the boiling operation will be described. When the hot water storage temperature sensor 41 detects that the necessary amount of heat does not remain in the hot water storage tank 2 in the midnight power time zone, the hot water storage control unit 46 notifies the heat pump control unit 18. In response, a boiling start command is issued. Upon receiving the command, the heat pump control unit 18 starts driving the heat pump after starting the compressor 12, and uses the water / refrigerant heat exchanger 13 to cool the low temperature water taken out from the heat pump forward pipe 10 connected to the lower part of the hot water storage tank 2. The hot water is heated to a high temperature, returned to the hot water storage tank 2 from the heat pump return pipe 11 connected to the upper part of the hot water storage tank 2, and sequentially stacked from the upper part of the hot water storage tank 2 to store the hot water. When the hot water storage temperature sensor 41 detects that the necessary amount of heat has been stored, the hot water storage control unit 46 issues a boiling stop command to the heat pump control unit 18, and the heat pump control unit 18 stops the compressor 12 and heat pump circulation. The pump 17 is also stopped to end the boiling operation.

次に、給湯運転について説明すると、給湯栓４を開くと、給水管８からの給水が貯湯タンク２内に流れ込む。そして貯湯タンク２中間部に貯湯されている温水が中温水出湯管２９を介して中温水混合弁３０へ押し出される。なお、貯湯タンク２内には上部に高温水、下部に低温水が貯められることとなるが、その温度差により比重差が発生し、温度境界層を形成して比重の軽い高温水が上部に、比重の重い低温水が下部に位置するので、互いに混じり合うことはないものである。 Next, the hot water supply operation will be described. When the hot water tap 4 is opened, the water supplied from the water supply pipe 8 flows into the hot water storage tank 2. Then, the hot water stored in the intermediate portion of the hot water storage tank 2 is pushed out to the intermediate hot water mixing valve 30 through the intermediate hot water outlet pipe 29. In the hot water storage tank 2, high temperature water is stored in the upper part and low temperature water is stored in the lower part. A difference in specific gravity occurs due to the temperature difference, and a high temperature water having a low specific gravity is formed in the upper part by forming a temperature boundary layer. Since the low-temperature water with a high specific gravity is located at the lower part, they do not mix with each other.

ここで、貯湯制御部４６は中温水出湯管２９からの温水と出湯管７からの高温水とを混合して中温水混合弁３０にてリモコン５で設定された給湯設定温度より一定温度以上高い混合目標温度となるように中温水混合弁３０を適当な比率に調整する。そして、中温水混合弁３０から流出した混合目標温度の湯は中間給湯管３２を介して給湯混合弁３３へ流入し、給水バイパス管３４からの給水と混合され、貯湯制御部４６が給湯混合弁３３の弁開度を調整し給湯設定温度の湯が給湯栓４から給湯される。そして、給湯栓４の閉止により給湯が終了するものである。 Here, the hot water storage control unit 46 mixes the hot water from the intermediate hot water outlet pipe 29 and the high temperature water from the outlet hot water pipe 7 and is higher than the hot water supply set temperature set by the remote controller 5 by the intermediate hot water mixing valve 30 by a certain temperature or more. The intermediate temperature water mixing valve 30 is adjusted to an appropriate ratio so as to reach the mixing target temperature. The hot water at the target mixing temperature that has flowed out of the intermediate hot water mixing valve 30 flows into the hot water supply mixing valve 33 through the intermediate hot water supply pipe 32 and is mixed with the water supply from the water supply bypass pipe 34, so that the hot water storage control unit 46 is operated. The hot water at the hot water supply set temperature is supplied from the hot water tap 4 by adjusting the valve opening 33. Then, the hot water supply is completed by closing the hot water tap 4.

ここで、中温水混合弁３０は給湯設定温度よりも一定温度以上高い混合目標温度の湯を中間給湯管３２に供給するようにしているので、中温水出湯管２９から出湯する温水の温度が給湯設定温度よりも低い場合は、貯湯制御部４６により中温水混合弁３０の弁開度が調整されて出湯管７からの高温水を用いて給湯設定温度よりも一定温度高い混合目標温度の湯を中間給湯管３２に供給するようにし、貯湯タンク２の中間位置からの出湯を優先し、貯湯タンク２の上部に貯湯されている高温水の使用を最小限に留め、熱源となる高温水をより多く確保することが可能となる。 Here, since the hot water mixing valve 30 supplies hot water having a mixing target temperature higher than the hot water supply set temperature by a certain temperature or more to the intermediate hot water supply pipe 32, the temperature of the hot water discharged from the hot hot water supply pipe 29 is the hot water supply temperature. When the temperature is lower than the set temperature, the hot water storage control unit 46 adjusts the valve opening degree of the intermediate temperature water mixing valve 30 and uses hot water from the hot water discharge pipe 7 to supply hot water having a mixing target temperature higher than the hot water supply set temperature. The hot water supply from the intermediate position of the hot water storage tank 2 is given priority, the use of the hot water stored in the upper part of the hot water storage tank 2 is kept to a minimum, and the high temperature water serving as a heat source is further increased. Many can be secured.

次に、浴槽６への湯張り運転について説明すると、リモコン５の風呂自動スイッチ４４が操作されると、貯湯制御部４６が湯張り弁３８を開弁すると共に、風呂三方弁２８をバイパス管２７側に開く。そして、給水管８からの給水が貯湯タンク２内に流れ込み、中温水出湯管２９を介して中温水混合弁３０へ貯湯タンク２内の温水が押し出される。 Next, the hot water filling operation to the bathtub 6 will be described. When the bath automatic switch 44 of the remote controller 5 is operated, the hot water storage control unit 46 opens the hot water filling valve 38 and the bath three-way valve 28 is connected to the bypass pipe 27. Open to the side. Then, the water supply from the water supply pipe 8 flows into the hot water storage tank 2, and the hot water in the hot water storage tank 2 is pushed out to the intermediate hot water mixing valve 30 through the intermediate temperature hot water discharge pipe 29.

ここで、貯湯制御部４６は風呂自動スイッチ４４の入力を受けると、中温水出湯管２９からの温水と出湯管７からの高温水を混合して中温水混合弁３０にてリモコン５で設定された風呂設定温度あるいは給湯設定温度の高い方の温度より一定温度以上高い混合目標温度温度となるように中温水混合弁３０を適当な比率に調整するようにしている。 When the hot water storage controller 46 receives an input from the automatic bath switch 44, the hot water from the intermediate hot water tap pipe 29 and the hot water from the hot pipe 7 are mixed and set by the remote controller 5 at the intermediate hot water mixing valve 30. In addition, the intermediate temperature water mixing valve 30 is adjusted to an appropriate ratio so that the mixing target temperature is higher by a certain temperature or higher than the higher of the bath setting temperature or the hot water supply setting temperature.

そして、中温水混合弁３０から流出した混合目標温度の湯は中間給湯管３２を介して給湯混合弁３３へ流入し、給水バイパス管３４からの給水と混合され、貯湯制御部４６が給湯混合弁３３の弁開度を調整し、風呂設定温度の湯が湯張り管３７から風呂循環回路２３を介して浴槽６へ注湯され湯張りされ、湯張り管３７途中に設けられた風呂流量カウンタ３９が所定の湯張り量をカウントすると貯湯制御部４６が湯張り弁３８を閉弁して湯張り運転を終了するものである。 The hot water at the target mixing temperature that has flowed out of the intermediate hot water mixing valve 30 flows into the hot water supply mixing valve 33 through the intermediate hot water supply pipe 32 and is mixed with the water supply from the water supply bypass pipe 34, so that the hot water storage control unit 46 is operated. The bath opening counter 33 is adjusted so that hot water having a bath set temperature is poured from the hot water filling pipe 37 into the bathtub 6 through the bath circulation circuit 23 and is filled with water, and a bath flow counter 39 provided in the middle of the hot water filling pipe 37. When the predetermined hot water filling amount is counted, the hot water storage control unit 46 closes the hot water filling valve 38 to end the hot water filling operation.

次に、浴槽６内の浴槽水の昇温について図３のフローチャートを用いて説明すると、浴槽６内の浴槽水の昇温は、ユーザーがリモコン５のあつめスイッチ４５を操作することにより開始されるもので、貯湯制御部４６は、あつめスイッチ４５が操作されたか否かを判断し（ステップＳ１）、あつめスイッチ４５が操作されると昇温制御部４７は貯湯タンク２に配設された貯湯温度センサ４１が検出する温度をチェックし、風呂熱交換器１９近傍の温水温度が熱交換に最低限必要と考えられる所定温度Ｔ、ここでは、貯湯温度センサ４１ｃの検出する温度が５０℃より高いかどうかを判定し（ステップＳ２）、所定温度Ｔ以下と判定した場合は、貯湯タンク２内の熱量で浴槽６内の浴槽水の昇温は不可能と判断して、浴槽水の昇温を中止する（ステップＳ３）。この時、浴槽水の昇温を中止した旨をリモコン５にて音声や文字等で報知することが好ましい。 Next, the temperature rise of the bathtub water in the bathtub 6 will be described using the flowchart of FIG. 3. The temperature rise of the bathtub water in the bathtub 6 is started when the user operates the gather switch 45 of the remote controller 5. Therefore, the hot water storage control unit 46 determines whether or not the hot switch 45 has been operated (step S1), and when the hot switch 45 is operated, the temperature increase control unit 47 causes the hot water storage temperature disposed in the hot water storage tank 2 to be operated. The temperature detected by the sensor 41 is checked, and the temperature of the hot water in the vicinity of the bath heat exchanger 19 is considered to be a minimum temperature necessary for heat exchange. In this case, is the temperature detected by the hot water storage temperature sensor 41c higher than 50 ° C. If it is determined whether or not the temperature is equal to or lower than the predetermined temperature T, it is determined that heating of the bath water in the bathtub 6 is impossible by the amount of heat in the hot water storage tank 2, and the heating of the bath water is stopped. Do ( Step S3). At this time, it is preferable to notify the remote controller 5 by voice, text, or the like that the temperature rise of the bathtub water has been stopped.

前記ステップＳ２で前記所定温度より高いと判定した場合は、貯湯温度センサ４１の検出する温度情報によりその時点の貯湯タンク２内の温水の温度分布を検出すると共に、水位センサ２６により浴槽６内の水位を検出し、その後、風呂循環ポンプ２０を駆動し浴槽６内の浴槽水を所定時間循環させ風呂温度センサ２５により浴槽水の温度を検出し（ステップＳ４）、前記所定時間が経過したら風呂循環ポンプ２０を停止させる。この時、風呂三方弁２８はバイパス管２７側に開かれており、風呂熱交換器１９を迂回するように浴槽水を循環させ、貯湯タンク２内の温水温度を低下させないようにしているものである。 When it is determined in step S2 that the temperature is higher than the predetermined temperature, the temperature information detected by the hot water storage temperature sensor 41 detects the temperature distribution of the hot water in the hot water storage tank 2 at that time, and the water level sensor 26 detects the temperature in the bathtub 6. After detecting the water level, the bath circulation pump 20 is driven to circulate the bath water in the bathtub 6 for a predetermined time, and the bath temperature sensor 25 detects the temperature of the bath water (step S4). The pump 20 is stopped. At this time, the bath three-way valve 28 is opened to the bypass pipe 27 side, and the bath water is circulated so as to bypass the bath heat exchanger 19 so that the temperature of the hot water in the hot water storage tank 2 is not lowered. is there.

次に、温度分布予測手段４８は前記ステップＳ４で検出した貯湯タンク２内の温水の温度分布と浴槽６内の水位と浴槽水の温度とを用いて、前記（式１）〜（式４）または（式５）によって追い焚き運転後の貯湯タンク２内の風呂熱交換器１９近傍の温水の温度を予測し、その結果と前記ステップＳ４で検出した貯湯タンク２内の温水の温度分布とを基に、追い焚き運転後の貯湯タンク２内の温水の温度分布を予測する（ステップＳ５）。 Next, the temperature distribution predicting means 48 uses the temperature distribution in the hot water storage tank 2 detected in step S4, the water level in the bathtub 6 and the temperature of the bath water, and the above (Expression 1) to (Expression 4). Alternatively, the temperature of the hot water in the vicinity of the bath heat exchanger 19 in the hot water storage tank 2 after the reheating operation is predicted by (Equation 5), and the result and the temperature distribution of the hot water in the hot water storage tank 2 detected in step S4 are obtained. Based on this, the temperature distribution of the hot water in the hot water storage tank 2 after the chasing operation is predicted (step S5).

ここで、水位センサ２６が検出した水位と予め記憶した浴槽断面積とから浴槽水量Ｌ１が２００Ｌ、風呂温度センサ２５が検出した浴槽水温度が４０℃、追い焚き目標温度が４２℃、浴槽水の昇温開始時の貯湯タンク２内の温水の温度分布が表１のＡ欄に示されたものであるとする。なお、表１中の貯湯温度センサ４１の欄の最上部とされるところの温度は貯湯温度センサ４１ａの検出する温度と同じ温度とし、表１中の貯湯温度センサ４１の欄の最下部とされるところの温度は貯湯温度センサ４１ｇの検出する温度と同じ温度とするものである。 Here, from the water level detected by the water level sensor 26 and the previously stored bathtub cross-sectional area, the bath water amount L1 is 200 L, the bath water temperature detected by the bath temperature sensor 25 is 40 ° C., the reheating target temperature is 42 ° C., and the bath water is It is assumed that the temperature distribution of the hot water in the hot water storage tank 2 at the start of the temperature rise is shown in the column A of Table 1. Note that the temperature at the top of the column of the hot water storage temperature sensor 41 in Table 1 is the same as the temperature detected by the hot water storage temperature sensor 41a, and is at the bottom of the column of the hot water storage temperature sensor 41 in Table 1. This temperature is the same as the temperature detected by the hot water storage temperature sensor 41g.

上記検出値から前記ステップＳ５で前記（式１）〜（式４）または（式５）によって追い焚き運転後の風呂熱交換器１９（蛇管）部分、つまり貯湯温度センサ４１ｂ及び貯湯温度センサ４１ｃの平均温度を次式により算出すると、
追い焚き運転後蛇管位置平均温度Ｔ３
＝蛇管位置平均温度Ｔ２ − 追い焚き必要熱量Ｑ１／蛇管位置容量Ｌ２
＝（（７１＋５９）／２） − (２００×２) ／６０
≒５８．３［℃］
となり、この算出した追い焚き運転後蛇管位置平均温度Ｔ３を、浴槽６内の浴槽水の昇温開始時に貯湯温度センサ４１が検出した温水の温度のうち、貯湯温度センサ４１ｂ及び貯湯温度センサ４１ｃで検出した温度のところに代入することで、追い焚き運転後の貯湯タンク２内の温水の温度分布を予測する。その結果を表１のＢ欄に示す。 From the detected value, in step S5, the bath heat exchanger 19 (conduit) portion after the reheating operation according to (Expression 1) to (Expression 4) or (Expression 5), that is, the hot water storage temperature sensor 41b and the hot water storage temperature sensor 41c. When the average temperature is calculated by the following formula,
After the chasing operation, the mean position temperature T3
= Meandering tube position average temperature T2-reheating required heat quantity Q1 / conduit tube position capacity L2
= ((71 + 59) / 2)-(200 × 2) / 60
≒ 58.3 [℃]
Thus, the calculated meandering tube position average temperature T3 after the reheating operation is determined by the hot water storage temperature sensor 41b and the hot water storage temperature sensor 41c among the hot water temperatures detected by the hot water storage temperature sensor 41 at the start of the temperature increase of the bath water in the bathtub 6. By substituting for the detected temperature, the temperature distribution of the hot water in the hot water storage tank 2 after the reheating operation is predicted. The results are shown in column B of Table 1.

そして、前記ステップＳ５で温度分布予測手段４８が予測した温度分布と、昼間時間帯に貯湯温度センサ４１の検出する温度や、貯湯温度センサ４１の検出する温度から算出される残湯量や、追い焚き運転の有無等から沸き増し条件設定手段４９により適宜設定された沸き増し運転の沸き増し開始条件とを基に、沸き増し判定手段５０は、前記予測された温度分布が前記沸き増し開始条件に当てはまるかどうかを比較して、前記追い焚き運転が行われた結果、沸き増し運転が行われるかどうかを判定する（ステップＳ６）。 Then, the temperature distribution predicted by the temperature distribution prediction means 48 in step S5, the temperature detected by the hot water storage temperature sensor 41 in the daytime period, the amount of remaining hot water calculated from the temperature detected by the hot water storage temperature sensor 41, and the reheating. Based on the heating start condition of the heating increase operation set appropriately by the heating condition setting unit 49 based on the presence / absence of operation, the heating increase determination means 50 applies the predicted temperature distribution to the heating start condition. It is determined whether or not the reheating operation is performed as a result of the reheating operation (step S6).

ここで、前記ステップＳ６で沸き増し条件設定手段４９により設定された沸き増し開始条件を、貯湯温度センサ４１ｂ検出温度＜６０℃ または貯湯温度センサ４１ｃ検出温度＜４８℃とした場合、この沸き増し条件と、表１のＢ欄に示した追い焚き運転後の貯湯タンク２内の温水の予測温度分布とを比較すると、表１のＢ欄より貯湯温度センサ４１ｂの予測温度が５８．３℃なので、沸き増し開始条件の貯湯温度センサ４１ｂ検出温度＜６０℃に当てはまり、沸き増し判定手段５０は沸き増し運転が行われると判定されるものである。 Here, when the heating start condition set by the heating condition setting means 49 in step S6 is the hot water storage temperature sensor 41b detection temperature <60 ° C. or the hot water storage temperature sensor 41c detection temperature <48 ° C., this boiling increase condition And the predicted temperature distribution of the hot water in the hot water storage tank 2 after the reheating operation shown in the B column of Table 1, the predicted temperature of the hot water storage temperature sensor 41b is 58.3 ° C. from the B column of Table 1. When the detected temperature <60 ° C. of the hot water storage temperature sensor 41b in the boiling start condition is satisfied, the boiling increase determination means 50 is determined to perform the boiling increase operation.

前記ステップＳ６で沸き増し運転が行われると判定された場合は、湯張り弁３８を開弁すると共に、風呂三方弁２８をバイパス管２７側に開き、さらに、中温水混合弁３０の弁開度を出湯管７側が全開になるように調整すると共に、給湯混合弁３３の弁開度を中間給湯管３２側が全開になるように調整して、貯湯タンク２上部の高温水、例えば８０℃程度の高温水を出湯管７から取り出し、中間給湯管３２、給湯管３５を流通させ、湯張り管３７から風呂循環回路２３を介して浴槽６に注湯する差し湯運転を行い（ステップＳ７）、次式により算出される注湯量を貯湯タンク２から浴槽６に注湯したら差し湯運転を終了するものである。
注湯量＝追い焚き必要熱量Ｑ１
／（貯湯温度センサ４１ａ検出温度−追い焚き目標温度） …（式６） If it is determined in step S6 that the reheating operation is performed, the hot water filling valve 38 is opened, the bath three-way valve 28 is opened to the bypass pipe 27 side, and the valve opening degree of the intermediate temperature water mixing valve 30 is further opened. Is adjusted so that the hot water supply pipe 7 side is fully open, and the opening degree of the hot water supply mixing valve 33 is adjusted so that the intermediate hot water supply pipe 32 side is fully open. Hot water is taken out from the hot water discharge pipe 7, the intermediate hot water supply pipe 32 and the hot water supply pipe 35 are circulated, and a hot water supply operation is performed in which the hot water is poured into the bathtub 6 through the bath circulation circuit 23 (step S 7). When the pouring amount calculated by the equation is poured from the hot water storage tank 2 into the bathtub 6, the hot water supply operation is terminated.
Quantity of pouring hot water = Requiring heat quantity Q1
/ (Detected temperature of hot water storage temperature sensor 41a-reheating target temperature) (Expression 6)

一方、前記ステップＳ６で、沸き増し運転が行われないと判定された場合は、風呂三方弁２８を風呂熱交換器１９側に開くと共に、風呂循環ポンプ２０を駆動し、浴槽６内の浴槽水を風呂循環回路２３を介して風呂熱交換器１９に循環させ貯湯タンク２内の高温水と熱交換させて浴槽水を追い焚きする追い焚き運転を行い（ステップＳ８）、風呂循環回路２３を循環する浴槽水の温度、すなわち、風呂往き管２１に備えた風呂温度センサ２５で検出する浴槽水の温度が追い焚き目標温度以上になったら、風呂循環ポンプ２０の駆動を停止して追い焚き運転を終了するものである。 On the other hand, when it is determined in step S6 that the reheating operation is not performed, the bath three-way valve 28 is opened to the bath heat exchanger 19 side, and the bath circulation pump 20 is driven, so Is circulated to the bath heat exchanger 19 through the bath circulation circuit 23 to exchange heat with the high-temperature water in the hot water storage tank 2 to retreat the bathtub water (step S8), and circulates in the bath circulation circuit 23. When the temperature of the bath water to be detected, that is, the temperature of the bath water detected by the bath temperature sensor 25 provided in the bath outlet pipe 21 becomes the reheating target temperature or more, the driving of the bath circulation pump 20 is stopped and the reheating operation is performed. It ends.

以上説明した浴槽６内の浴槽水の昇温時には、温度分布予測手段４８により追い焚き運転後の貯湯タンク２内の温水の温度分布を予測すると共に、沸き増し判定手段５０により追い焚き運転を行った結果、昼間時間帯に沸き増し運転が行われるかどうかを判定し、沸き増し運転が行われないと判定された場合には、昇温制御部４７は追い焚き運転を行うようにしたことで、電力単価の高い昼間時間帯に沸き増し運転が行われることなく追い焚き運転により良好に浴槽水の昇温ができ、一方、沸き増し運転が行われると判定された場合には、差し湯運転を行うようにしたことで、差し湯運転により良好に浴槽水の昇温ができると共に、事前に追い焚き運転による中温水の生成を回避できるため、ヒートポンプユニット３による貯湯タンク２内の湯水の沸き上げ、すなわち昼間時間帯の沸き増し運転や深夜時間帯の沸き上げ運転時のＣＯＰを向上させることができるものであり、さらに追い焚き必要熱量Ｑ１を、水位センサ２６で検出した浴槽６内の水位と、風呂温度センサ２５で検出した浴槽６内の浴槽水の温度と、追い焚き運転により浴槽６内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出するようにしたので、追い焚き運転後の貯湯タンク２内の貯湯温水の温度をほぼ正確に予測することができるものである。 When the temperature of the bathtub water in the bathtub 6 described above is increased, the temperature distribution predicting means 48 predicts the temperature distribution of the hot water in the hot water storage tank 2 after the reheating operation, and the reheating determination means 50 performs the reheating operation. As a result, it is determined whether or not the reheating operation is performed in the daytime period, and when it is determined that the reheating operation is not performed, the temperature increase control unit 47 performs the reheating operation. If it is determined that the bath water temperature can be raised satisfactorily by the reheating operation without the reheating operation during the daytime hours when the unit price of electricity is high, the hot water operation is performed when it is determined that the reheating operation is performed. Since the bath water temperature can be increased satisfactorily by the hot water operation and the generation of intermediate temperature water by the reheating operation can be avoided in advance, the heat pump unit 3 in the hot water storage tank 2 It is possible to improve the COP during the boiling of water, that is, the heating operation during the daytime period and the boiling operation during the nighttime period, and further, the bathtub 6 in which the necessary heat amount Q1 is detected by the water level sensor 26. The water level in the bath, the temperature of the bath water in the bathtub 6 detected by the bath temperature sensor 25, and the reheating target temperature which is the target temperature for raising the temperature of the bath water in the bathtub 6 through the reheating operation. Since the calculation is based on this, the temperature of the hot water in the hot water storage tank 2 after the reheating operation can be predicted almost accurately.

また、先に述べた浴槽水量Ｌ１が２００Ｌ、風呂温度センサ２５が検出した浴槽水温度が４０℃、追い焚き目標温度が４２℃、浴槽水の昇温開始時の貯湯タンク２内の温水の温度分布が表１という条件で、浴槽水の昇温開始時から差し湯運転を行った場合、その注湯量は、（式６）より
注湯量＝追い焚き必要熱量Ｑ１
／（貯湯温度センサ４１ａ検出温度−追い焚き目標温度）
＝４００／（８０−４２）
≒１１［Ｌ］
となり、差し湯運転後の貯湯タンク２内の温水の温度分布は表２に示すようになる。なお、表２中の貯湯温度センサ４１の欄の最下部とされるところの温度は、注湯量分だけ貯湯タンク２内に給水管８から流入した給水の温度で、ここでは５℃とする。 The bath water amount L1 described above is 200L, the bath water temperature detected by the bath temperature sensor 25 is 40 ° C., the reheating target temperature is 42 ° C., and the temperature of the hot water in the hot water storage tank 2 at the start of the bath water temperature rise. When the hot water operation is performed from the start of the temperature rise of the bath water under the condition of distribution shown in Table 1, the amount of pouring water is calculated as follows: (Equation 6)
/ (Detected temperature of hot water storage temperature sensor 41a-reheating target temperature)
= 400 / (80-42)
≒ 11 [L]
Thus, the temperature distribution of the hot water in the hot water storage tank 2 after the hot water operation is as shown in Table 2. The temperature at the bottom of the column of the hot water storage temperature sensor 41 in Table 2 is the temperature of the water supplied from the water supply pipe 8 into the hot water storage tank 2 by the amount of pouring, and is 5 ° C. here.

この表２に示した差し湯運転後の貯湯タンク２内の温水の温度分布と前記沸き増し開始条件（貯湯温度センサ検出温度４１ｂ＜６０℃ または貯湯温度センサ４１ｃ検出温度＜４８℃）を比較すると、沸き増し開始条件には当てはまらず、沸き増し運転は行われないことになる。よって、温度分布予測手段４８により、追い焚き運転後の貯湯タンク２内の温水の温度分布を予測すると共に、沸き増し判定手段５０により、追い焚き運転を行うことで沸き増し運転が行われると判定された場合には、浴槽６内の浴槽水の昇温開始時から差し湯運転を行うことで、追い焚き運転を行った場合のように貯湯タンク２内の湯水が広範囲に温度低下することがなく、電力単価の高い昼間時間帯に沸き増し運転が行われる頻度を減少させることができ、ランニングコストを抑え経済性を向上させることができるものである。 Comparing the temperature distribution of hot water in the hot water storage tank 2 after hot water operation shown in Table 2 and the above-described boiling start condition (hot water storage temperature sensor detection temperature 41b <60 ° C. or hot water storage temperature sensor 41c detection temperature <48 ° C.) This is not the case with the start-up condition, and no additional heating operation is performed. Therefore, the temperature distribution predicting unit 48 predicts the temperature distribution of the hot water in the hot water storage tank 2 after the reheating operation, and the boiling increase determining unit 50 determines that the reheating operation is performed by performing the reheating operation. In such a case, the hot water operation is started from the start of the temperature rise of the bathtub water in the bathtub 6, so that the temperature of the hot water in the hot water storage tank 2 is lowered in a wide range as in the case of the reheating operation. In addition, it is possible to reduce the frequency of boosting operation during daytime hours when the unit price of electricity is high, and to reduce running costs and improve economy.

また、従来のように、浴槽６内の浴槽水の昇温開始時は追い焚き運転をし、追い焚き運転の途中で差し湯運転に切り替えると、追い焚き運転により風呂熱交換器１９近傍の貯湯タンク２内の温水温度を低下させ、その上、差し湯運転によって貯湯タンク２上部の高温水も浴槽６に注湯して減少させて電気料金の高い昼間時間帯に沸き増し運転を行ってしまうが、先に述べたように、浴槽６内の浴槽水の昇温開始時から差し湯運転を行うことで、浴槽水の昇温終了時の貯湯タンク２内の温水の温度分布は、浴槽水の昇温開始時の貯湯タンク２内の温水の温度分布を基準として、貯湯タンク２上部の高温の注湯量分だけほぼそのまま上にスライドする形となるため、沸き増し運転が行われる可能性が低くなる。よって、温度分布予測手段４８により、追い焚き運転後の貯湯タンク２内の温水の温度分布を予測すると共に、沸き増し判定手段５０により、追い焚き運転を行うことで沸き増し運転が行われると判定された場合には、浴槽６内の浴槽水の昇温開始時から差し湯運転を行うことで、追い焚き運転を行った場合のように貯湯タンク２内の湯水が広範囲に温度低下することがなく、電力単価の高い昼間時間帯に沸き増し運転が行われる頻度を減少させることができ、ランニングコストを抑え経済性を向上させることができるものである。 In addition, when the temperature of the bathtub water in the bathtub 6 starts to be increased as in the prior art, when the hot water operation is switched to the hot water operation in the middle of the hot water operation, the hot water storage in the vicinity of the bath heat exchanger 19 is performed. The temperature of the hot water in the tank 2 is lowered, and the hot water at the top of the hot water storage tank 2 is poured into the bathtub 6 and reduced by hot water operation, so that the hot water is heated during the daytime when electricity is high. However, as described above, the temperature distribution of the hot water in the hot water storage tank 2 at the end of the temperature rise of the bath water is the bath water by performing the hot water operation from the start of the temperature rise of the bath water in the bath 6. Since the temperature of the hot water in the hot water storage tank 2 at the start of the heating of the hot water tank 2 is the standard, the hot water pouring amount in the upper part of the hot water storage tank 2 will slide up almost as it is. Lower. Therefore, the temperature distribution predicting unit 48 predicts the temperature distribution of the hot water in the hot water storage tank 2 after the reheating operation, and the boiling increase determining unit 50 determines that the reheating operation is performed by performing the reheating operation. In such a case, the hot water operation is started from the start of the temperature rise of the bathtub water in the bathtub 6, so that the temperature of the hot water in the hot water storage tank 2 is lowered in a wide range as in the case of the reheating operation. In addition, it is possible to reduce the frequency of boosting operation during daytime hours when the unit price of electricity is high, and to reduce running costs and improve economy.

なお、本発明は上記の一実施形態に限定されるものではなく、上記の一実施形態では、リモコン５のあつめスイッチ４５が操作された時の浴槽水の昇温時に本発明を適用したが、リモコン５の風呂自動スイッチ４４が操作され前記湯張り運転終了後の保温運転による浴槽水の昇温時にも本発明を適用してもよいものである。 The present invention is not limited to the above-described embodiment. In the above-described embodiment, the present invention is applied at the time of raising the temperature of the bathtub water when the operation switch 45 of the remote controller 5 is operated. The present invention may also be applied when the bath water is heated by the heat retaining operation after the bath automatic switch 44 of the remote controller 5 is operated and the hot water filling operation is completed.

また、前記浴槽６内の浴槽水の昇温時に、追い焚き必要熱量Ｑ１を、水位センサ２６で検出した浴槽６内の水位と、風呂温度センサ２５で検出した浴槽６内の浴槽水の温度と、追い焚き運転により浴槽６内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出するようにしたが、追い焚き必要熱量Ｑ１を、所定の浴槽水量、例えば、リモコン５で設定された湯張り量や固定値（１８０Ｌ等）と、風呂温度センサ２５で検出した浴槽６内の浴槽水の温度と、追い焚き運転により浴槽６内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出してもよく、そうすることで、追い焚き運転後の貯湯タンク２内の貯湯温水の温度をほぼ正確に予測することができ、前記所定の浴槽水量を用いることで、追い焚き必要熱量を簡単に算出することができるものである。 Further, when the temperature of the bathtub water in the bathtub 6 is increased, the amount of heat required for reheating Q1 is determined by the water level in the bathtub 6 detected by the water level sensor 26 and the temperature of the bathtub water in the bathtub 6 detected by the bath temperature sensor 25. The reheating target temperature is calculated based on the reheating target temperature that is the target temperature for increasing the temperature of the bath water in the bathtub 6 by reheating operation. For example, the amount of hot water set by the remote controller 5 and a fixed value (180 L, etc.), the temperature of the bath water in the bathtub 6 detected by the bath temperature sensor 25, and the temperature of the bath water in the bathtub 6 are increased by the chasing operation. It may be calculated based on the reheating target temperature, which is the target temperature to be made, so that the temperature of the hot water in the hot water storage tank 2 after the reheating operation can be predicted almost accurately. Can use the predetermined amount of bathtub water In Rukoto, in which it is possible to easily calculate the required amount of heat reheating.

また、前記浴槽６内の浴槽水の昇温時であって、差し湯運転を行う時に、中温水混合弁３０の弁開度を出湯管７側が全開になるように調整すると共に、給湯混合弁３３の弁開度を中間給湯管３２側が全開になるように調整して、貯湯タンク２上部の高温水を湯張り管３７から風呂循環回路２３に注湯するようにしているが、給湯混合弁３３の出口温度が所定温度、例えば６０℃や７０℃になるように中温水混合弁３０の出口温度を所定温度より一定温度高くなるように弁開度を調整すると共に、給湯混合弁３３の出口温度が６０℃や７０℃になるように混合比率を調整して、所定温度に混合した高温水を湯張り管３７から風呂循環回路２３に注湯するようにしてもよいものである。 In addition, when the temperature of the bath water in the bathtub 6 is raised and the hot water operation is performed, the opening degree of the intermediate temperature water mixing valve 30 is adjusted so that the outlet pipe 7 side is fully opened, and the hot water supply mixing valve The valve opening of 33 is adjusted so that the intermediate hot water supply pipe 32 side is fully open, and hot water in the upper part of the hot water storage tank 2 is poured from the hot water filling pipe 37 into the bath circulation circuit 23. The outlet of the hot water mixing valve 33 is adjusted so that the outlet temperature of the intermediate temperature water mixing valve 30 becomes a predetermined temperature higher than the predetermined temperature so that the outlet temperature of the outlet 33 becomes a predetermined temperature, for example, 60 ° C. or 70 ° C. The mixing ratio may be adjusted so that the temperature becomes 60 ° C. or 70 ° C., and hot water mixed at a predetermined temperature may be poured from the hot water filled pipe 37 into the bath circulation circuit 23.

この発明の一実施形態の概略構成図。The schematic block diagram of one Embodiment of this invention. 同一実施形態の要部ブロック図。The principal part block diagram of the same embodiment. 同一実施形態の浴槽の浴槽水の昇温時の制御を示すフローチャート。The flowchart which shows the control at the time of temperature rising of the bathtub water of the bathtub of the same embodiment.

符号の説明Explanation of symbols

２貯湯タンク
３加熱手段（ヒートポンプユニット）
６浴槽
１９風呂熱交換器
２０風呂循環ポンプ
２３風呂循環回路
３７湯張り管
４１貯湯温度検出手段（貯湯温度センサ）
４７昇温制御部
４８温度分布予測手段
４９沸き増し条件設定手段
５０沸き増し判定手段 2 Hot water storage tank 3 Heating means (heat pump unit)
6 Bath 19 Bath Heat Exchanger 20 Bath Circulation Pump 23 Bath Circulation Circuit 37 Hot Water Filling Tube 41 Hot Water Storage Temperature Detection Means (Hot Water Storage Temperature Sensor)
47 Temperature increase control unit 48 Temperature distribution predicting means 49 Heating condition setting means 50 Heating determination means

Claims

湯水を貯湯する貯湯タンクと、該貯湯タンク内の湯水を加熱する加熱手段と、前記貯湯タンクの貯湯温水の温度を検出する貯湯温度検出手段と、浴槽に接続される風呂循環回路と、前記浴槽の浴槽水を前記風呂循環回路に循環させる風呂循環ポンプと、前記風呂循環回路を循環する前記浴槽水を前記貯湯タンク内の湯水と熱交換させる風呂熱交換器と、前記風呂循環回路に接続され前記貯湯タンク内の湯水を前記浴槽へ注湯する湯張り管と、前記浴槽内の浴槽水の昇温時に、前記浴槽水を前記風呂熱交換器に循環して追い焚きする追い焚き運転か、前記湯張り管から前記貯湯タンク内の温水を前記風呂循環回路に注湯する差し湯運転のどちらかを行わせる昇温制御部とを備えた貯湯式給湯装置において、前記浴槽内の浴槽水の昇温開始時に、その時点の前記貯湯温度検出手段が検出する貯湯温水の温度と前記浴槽内の浴槽水の昇温に必要な追い焚き必要熱量とに基づいて、前記追い焚き運転後の前記貯湯タンク内の温水の温度分布を予測する温度分布予測手段と、昼間時間帯に前記貯湯タンク内の熱量が減少した時に前記加熱手段により前記貯湯タンク内の湯水を沸き増す沸き増し運転を開始する沸き増し開始条件を設定する沸き増し条件設定手段と、前記温度分布予測手段により予測された前記温度分布と前記沸き増し条件設定手段により設定された沸き増し開始条件とに基づいて、前記追い焚き運転を行うことで前記沸き増し運転が行われるかどうかを判定する沸き増し判定手段とを設け、前記浴槽内の浴槽水の昇温開始時に、前記温度分布予測手段で予測された前記温度分布が前記沸き増し開始条件に当てはまらず、前記沸き増し判定手段によって前記沸き増し運転が行われないと判定された場合、前記昇温制御部は前記追い焚き運転を行わせるようにし、前記浴槽内の浴槽水の昇温開始時に、前記温度分布予測手段で予測された前記温度分布が前記沸き増し開始条件に当てはまり、前記沸き増し判定手段によって前記沸き増し運転が行われると判定された場合、前記昇温制御部は前記差し湯運転を行わせるようにしたことを特徴とする貯湯式給湯装置。
Hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, hot water storage temperature detecting means for detecting the temperature of the hot water stored in the hot water storage tank, a bath circulation circuit connected to the bathtub, and the bathtub A bath circulation pump that circulates the bath water in the bath circulation circuit, a bath heat exchanger that exchanges heat between the bath water circulating in the bath circulation circuit and hot water in the hot water storage tank, and the bath circulation circuit. A hot-water pipe that pours hot water in the hot water storage tank into the bathtub, and a reheating operation that circulates and recirculates the bathtub water to the bath heat exchanger when the temperature of the bathtub water in the bathtub rises. A hot water storage type hot water supply apparatus comprising a temperature rise control unit for performing either a hot water operation for pouring hot water in the hot water storage tank from the hot water pipe into the bath circulation circuit . At the start of temperature rise The hot water storage temperature detecting means based on the reheating heat requirements and necessary bath water Atsushi Nobori within the bath and the temperature of the hot water storage hot water detected by the hot water in the hot water storage tank after the reheating operation time a temperature distribution estimation means for estimating the temperature distribution, reheating start condition to start the boiling increases reheating operation the hot water in the by Ri the hot water storage tank to the heating means when the heat is reduced in the hot water storage tank in daytime The reheating operation is performed based on the temperature increase predicted by the temperature distribution prediction means and the temperature increase prediction condition set by the temperature increase prediction condition setting means. the additional boiling determination means for determining whether said reheating operation is performed is provided, at the start heating of the bath water in the bathtub, predicted the temperature distribution in the temperature distribution predicting means When the boiling increase start condition is not satisfied and the boiling increase determination unit determines that the boiling increase operation is not performed, the temperature increase control unit causes the reheating operation to be performed, and the bathtub in the bathtub When the temperature distribution predicted by the temperature distribution predicting unit is applied to the boiling increase start condition at the start of the temperature increase of water and the boiling increase determination unit determines that the boiling increase operation is performed, the temperature increase A hot water storage type hot water supply apparatus characterized in that the control section causes the hot water supply operation to be performed.

前記追い焚き必要熱量を、前記浴槽内の水位と、前記浴槽内の浴槽水の温度と、前記追い焚き運転により前記浴槽内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出するようにしたことを特徴とする請求項１記載の貯湯式給湯装置。 The reheating target is the reheating target, which is the target temperature at which the water level in the bathtub, the temperature of the bathtub water in the bathtub, and the temperature of the bathtub water in the bathtub are increased by the reheating operation. The hot water storage type hot water supply apparatus according to claim 1, wherein the calculation is based on temperature.

前記追い焚き必要熱量を、所定の浴槽水量と、前記浴槽内の浴槽水の温度と、前記追い焚き運転により前記浴槽内の浴槽水を昇温させようとする目標の温度である追い焚き目標温度とに基づいて算出するようにしたことを特徴とする請求項１記載の貯湯式給湯装置。 The reheating required heat amount is a predetermined bath water amount, a temperature of the bath water in the bathtub, and a reheating target temperature that is a target temperature to increase the temperature of the bathtub water in the bathtub by the reheating operation. The hot water storage type hot water supply apparatus according to claim 1, wherein the calculation is based on the above.