JP4692148B2 - Heat pump water heater - Google Patents
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- JP4692148B2 JP4692148B2 JP2005234592A JP2005234592A JP4692148B2 JP 4692148 B2 JP4692148 B2 JP 4692148B2 JP 2005234592 A JP2005234592 A JP 2005234592A JP 2005234592 A JP2005234592 A JP 2005234592A JP 4692148 B2 JP4692148 B2 JP 4692148B2
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Description
本発明は、ヒートポンプ式給湯機に関し、特に浴槽や台所等への給湯が可能な貯湯タンクを備えたヒートポンプ式給湯機に関するものである。 The present invention relates to a heat pump water heater, and more particularly to a heat pump water heater provided with a hot water storage tank capable of supplying hot water to a bathtub, a kitchen or the like.
この種のヒートポンプ式給湯機として、従来から貯湯タンクを備えたものがある。ヒートポンプ式給湯機は、貯湯タンクの底部から低温水を流出させて、この低温水をヒートポンプ式加熱源にて沸き上げて貯湯タンクの上部に戻す沸上運転を行なう。そして、貯湯タンクの上部には出湯管が接続され、給湯の際にはこの出湯管を介して貯湯タンクの高温の湯（高温湯）が出湯される。また、風呂の追い焚きや保温のための熱交換器の熱源として、この貯湯タンクの湯が使用される。この場合、高温の湯が熱交換器に供給され、この熱交換器で熱交換されて温度低下して、３０℃〜５０℃程度の中間温度の温水（中温湯）となって貯湯タンクに戻る。このため、貯湯タンクには、その上下方向中間部に中温湯が溜まっている場合が多い。このような場合には、中温湯は、風呂の追い焚き等に利用するには低温すぎて、使用しきれない。そのため、高温湯が無くなるいわゆる湯切れ状態となれば、中温湯が残ったまま沸上運転を行なうことになる。 Conventionally, this type of heat pump type hot water heater has a hot water storage tank. The heat pump water heater performs a boiling operation in which low temperature water flows out from the bottom of the hot water storage tank, and the low temperature water is boiled up by a heat pump heating source and returned to the upper part of the hot water storage tank. A hot water pipe is connected to the upper part of the hot water storage tank, and hot water (hot water) in the hot water storage tank is discharged through the hot water pipe when hot water is supplied. The hot water in the hot water storage tank is used as a heat source of a heat exchanger for bathing and keeping warm. In this case, high-temperature hot water is supplied to the heat exchanger, the heat is exchanged by this heat exchanger, the temperature is lowered, and hot water (medium hot water) having an intermediate temperature of about 30 ° C. to 50 ° C. is returned to the hot water storage tank. . For this reason, hot water storage tanks often store medium-temperature hot water in the middle in the vertical direction. In such a case, the medium temperature hot water is too low to be used for chasing a bath or the like and cannot be used. For this reason, when the hot water runs out so that the hot water disappears, the boiling operation is performed with the medium hot water remaining.
しかしながら、中温湯が残ったまま沸上運転を行なうと、中温湯がヒートポンプ加熱源に供給される。このような中温湯をヒートポンプ加熱源にて加熱した場合、効率が悪く、ＣＯＰ（エネルギー消費効率）を低下させていた。そこで、この中温湯を優先的に使用できるようにしたヒートポンプ式給湯機が提案されている。 However, if the boiling operation is performed with the intermediate hot water remaining, the intermediate hot water is supplied to the heat pump heating source. When such medium temperature hot water is heated with a heat pump heating source, the efficiency is poor and COP (energy consumption efficiency) is reduced. In view of this, a heat pump type hot water heater has been proposed in which this hot water can be used preferentially.
すなわち、図５に示すように、貯湯タンク５１に中温湯用出湯管５２を接続し、この中温湯用出湯管５２を、切換弁５３を介して、貯湯タンク５１の上部に接続される出湯管５４に接続している。また、貯湯タンク５１の下部に給水管５５が接続され、さらにこの給水管５５から分岐管５６が分岐されている。そして、この分岐管５６が混合弁５７に接続されている。 That is, as shown in FIG. 5, a hot water outlet pipe 52 is connected to the hot water storage tank 51, and the hot water outlet pipe 52 is connected to the upper portion of the hot water storage tank 51 via the switching valve 53. 54. A water supply pipe 55 is connected to the lower part of the hot water storage tank 51, and a branch pipe 56 is branched from the water supply pipe 55. The branch pipe 56 is connected to the mixing valve 57.
すなわち、上記中温湯の温度が設定給湯温度以上のときには、切換弁５３を、中温湯用出湯管５２からの中温湯が混合弁５７に供給されるように切換え、この中温湯と、分岐管５６からの給水とを混合弁５７にて混合して給湯することになる。また、上記中温湯の温度が設定給湯温度未満のときには、切換弁５３を出湯管５４からの高温湯が混合弁５７に供給されるように切換え、この出湯管５４の高温湯と、分岐管５６の給水とを混合弁５７にて混合して給湯することになる。 That is, when the temperature of the hot water is equal to or higher than the set hot water temperature, the switching valve 53 is switched so that the hot water from the hot water outlet pipe 52 is supplied to the mixing valve 57. Is mixed with the feed water from the mixing valve 57 to supply hot water. When the temperature of the hot water is lower than the set hot water temperature, the switching valve 53 is switched so that the hot water from the tap pipe 54 is supplied to the mixing valve 57, and the hot water in the tap pipe 54 and the branch pipe 56 are switched. The hot water is mixed by the mixing valve 57 to supply hot water.
このため、中温湯の温度が設定給湯温度未満のときには、この中温湯を使用しないことになり、この中温湯が残ることになる。従って、湯切れ状態となっても中温湯が残ったままであり、この状態で沸上運転を行なうことになる。 For this reason, when the temperature of the medium temperature hot water is lower than the set hot water supply temperature, this medium temperature hot water is not used, and this medium temperature hot water remains. Therefore, even if the hot water runs out, the medium hot water remains, and the boiling operation is performed in this state.
そのため、中温湯を優先的に使用して、湯切れ状態となっても中温湯が残らないようにしたものも提案されている（例えば、特許文献１参照）。すなわち、特許文献１に記載のヒートポンプ式給湯機は、図６に示すように、貯湯タンク６１の頂部に出湯管６２を接続すると共に、貯湯タンク６１の底部に給水管６３を接続し、さらに、貯湯タンク６１の上下方向中間部に中温湯用出湯管６４を接続している。そして、給水管６３には給水バイパス管６５が接続され、この給水バイパス管６５と、中温湯用出湯管６４とが混合弁（第２混合弁）６７を介して接続される。また、出湯管６２は混合弁（第１混合弁）６６を介して給湯管６８が接続されている。そして、第１混合弁６６と第２混合弁６７とは接続管６９を介して接続される。なお、給湯管６８にはカラン７０が接続されている。 For this reason, there has been proposed a method in which medium-temperature hot water is preferentially used so that no medium-temperature hot water remains even if the hot-water condition is reached (see, for example, Patent Document 1). That is, as shown in FIG. 6, the heat pump water heater described in Patent Document 1 has a hot water supply pipe 62 connected to the top of the hot water storage tank 61 and a water supply pipe 63 connected to the bottom of the hot water storage tank 61, A hot water outlet pipe 64 is connected to an intermediate portion in the vertical direction of the hot water storage tank 61. A water supply bypass pipe 65 is connected to the water supply pipe 63, and the water supply bypass pipe 65 and the hot water hot water discharge pipe 64 are connected via a mixing valve (second mixing valve) 67. The hot water supply pipe 62 is connected to a hot water supply pipe 68 via a mixing valve (first mixing valve) 66. The first mixing valve 66 and the second mixing valve 67 are connected via a connection pipe 69. A currant 70 is connected to the hot water supply pipe 68.
この場合、中温湯用出湯管６４からの中温湯の温度が設定給湯温度よりも高い場合には、第２混合弁６７において、中温湯用出湯管６４からの中温湯が給水バイパス管６５からの給水とを混合して、その混合湯を給湯管６８から給湯する。また、中温湯用出湯管６４からの中温湯の温度が設定給湯温度より低い場合には、第１混合弁６６において、中温湯用出湯管６４からの中温湯と出湯管６２からの高温湯とを混合して、その混合湯を給湯管６８から給湯する。
しかしながら、図６に示すヒートポンプ式給湯機では、中温湯用出湯管６４からの中温湯の温度が設定給湯温度より高い場合には、第１混合弁６６において出湯管６２側を全閉状態とすると共に、第２混合弁６７を制御状態とする。また、中温湯用出湯管６４からの中温湯の温度が設定給湯温度よりも低い場合には、第２混合弁６７において給水バイパス管６５側を全閉状態とすると共に、第１混合弁６６を制御状態とする。 However, in the heat pump type water heater shown in FIG. 6, when the temperature of the hot water from the hot water outlet pipe 64 is higher than the set hot water temperature, the outlet pipe 62 side of the first mixing valve 66 is fully closed. At the same time, the second mixing valve 67 is brought into the control state. Further, when the temperature of the hot water from the hot water outlet pipe 64 is lower than the set hot water supply temperature, the water supply bypass pipe 65 side of the second mixing valve 67 is fully closed, and the first mixing valve 66 is turned on. Set to the control state.
このため、上記ヒートポンプ式給湯機においては、２つの混合弁を必要とし、しかも、中温湯用出湯管６４からの中温湯の温度に応じて、この２つの混合弁の制御を行なう必要があり、その制御が複雑であり、安定した制御が困難であり、装置としてコスト高となる。また、混合弁を２個使用せずに、三方切換弁を使用することも考えられるが、その場合、中温湯を全て有効に使用することができない。 For this reason, in the heat pump type hot water supply apparatus, two mixing valves are required, and it is necessary to control the two mixing valves according to the temperature of the hot water from the hot water outlet pipe 64. The control is complicated, stable control is difficult, and the cost of the apparatus increases. In addition, it is conceivable to use a three-way switching valve without using two mixing valves, but in this case, it is not possible to effectively use all the hot water.
本発明は上述の問題点に鑑みて提供したものであって、貯湯タンクに貯まる中温湯を優先的に使用することができ、沸上運転時に加熱源への中温湯の供給を回避できてＣＯＰの低下を防止でき、しかも、制御の簡略化を図り、装置の低コスト化を図ることを目的としたヒートポンプ式給湯機を提供するものである。 The present invention has been provided in view of the above-described problems, and can preferentially use the hot water stored in the hot water storage tank, and can avoid the supply of the hot water to the heating source during the boiling operation. It is possible to provide a heat pump type hot water heater that can prevent a decrease in the temperature and that is intended to simplify the control and reduce the cost of the apparatus.
そこで、本発明の請求項１に記載のヒートポンプ式給湯機では、貯湯タンク１の底部から低温水を流出させて、この低温水をヒートポンプ式加熱源３にて沸き上げて貯湯タンク１の上部に戻す沸上運転を行なうヒートポンプ式給湯機であって、上記貯湯タンク１の上部の高温湯を出湯する出湯管１６と、この出湯管１６と低温水を供給する水供給管２５とを接続する混合弁２１と、上記貯湯タンク１の中温湯を出湯する中温湯用出湯管２３と、この中温湯用出湯管２３に介設されて中温湯の供給を上記出湯管１６側または水供給管２５側に切換える切換手段２０と、上記混合弁２１に接続される給湯管２６とを備え、さらに上記中温湯の温度が設定給湯温度以上のときには上記中温湯用出湯管２３からの中温湯を出湯管１６を介して混合弁２１に供給すると共に、上記中温湯の温度が設定給湯温度未満のときには上記中温湯用出湯管２３からの中温湯を水供給管２５を介して混合弁２１に供給するように上記切換手段２０を切換え制御する弁制御手段３０を有し、給湯時において中温湯用出湯管２３から出湯された中温湯及び出湯管１６からの高温湯との合流湯と、上記水供給管２５からの給水との混合弁２１における混合比率、または上記貯湯タンク１からの高温湯と、中温湯及び水供給管２５からの給水の合流水との混合弁２１における混合比率を制御して上記設定給湯温度の湯の給湯を行なうことを特徴としている。 Therefore, in the heat pump hot water supply apparatus according to claim 1 of the present invention, low temperature water is caused to flow out from the bottom of the hot water storage tank 1, and the low temperature water is boiled by the heat pump heating source 3 to be placed on the upper part of the hot water storage tank 1. A heat pump type hot water supply apparatus that performs a boiling-up operation for returning, and is a mixture that connects a tapping pipe 16 that pours hot water at the top of the hot water storage tank 1 and a tapping pipe 16 and a water supply pipe 25 that feeds low-temperature water. A valve 21, a hot water outlet pipe 23 for discharging the hot water in the hot water storage tank 1, and an intermediate hot water outlet pipe 23, which supply the intermediate hot water to the outlet pipe 16 side or the water supply pipe 25 side. And a hot water supply pipe 26 connected to the mixing valve 21. Further, when the temperature of the intermediate hot water is equal to or higher than the set hot water supply temperature, the hot water from the intermediate hot water outlet pipe 23 is discharged from the hot water outlet pipe 16. Through the mixing valve 2 And the switching means 20 is switched so that the hot water from the hot water outlet pipe 23 is supplied to the mixing valve 21 through the water supply pipe 25 when the temperature of the hot water is lower than the set hot water temperature. Mixing of the hot water from the hot water from the hot water outlet 16 and the hot water from the hot water pipe 16 with the hot water from the hot water hot water hot water discharged from the hot water outlet pipe 23 at the time of hot water supply. Hot water supply at the set hot water temperature is controlled by controlling the mixing ratio in the valve 21 or the mixing ratio in the mixing valve 21 between the hot water from the hot water storage tank 1 and the combined water of the hot water from the medium hot water and the water supply pipe 25. It is characterized by performing .
請求項２に記載のヒートポンプ式給湯機では、上記切換手段２０が３方弁であることを特徴としている。 In the heat pump type water heater according to claim 2 , the switching means 20 is a three-way valve.
請求項３に記載のヒートポンプ式給湯機では、上記ヒートポンプ式加熱源３の冷媒回路Ｓの冷凍サイクルの高圧側が超臨界圧力で運転することを特徴としている。 The heat pump type hot water supply apparatus according to claim 3 is characterized in that the high pressure side of the refrigeration cycle of the refrigerant circuit S of the heat pump type heating source 3 is operated at a supercritical pressure.
請求項１のヒートポンプ式給湯機によれば、中温湯用出湯管から出湯される中温湯と水供給管からの給水とを混合して給湯したり、中温湯用出湯管から出湯される中温湯と貯湯タンクの高温湯とを混合して給湯したりすることができる。このため、貯湯タンク内の中温湯を有効に使用することができ、沸上効率の悪い中温湯を無くして、ＣＯＰの向上を図ることができる。 According to the heat pump type hot water supply apparatus of claim 1, hot water mixed with hot water discharged from a hot water outlet pipe and hot water supplied from a water supply pipe, or hot water discharged from an intermediate hot water outlet pipe. And hot water in a hot water storage tank can be mixed to supply hot water. For this reason, the intermediate temperature hot water in the hot water storage tank can be used effectively, the intermediate temperature hot water having low boiling efficiency can be eliminated, and the COP can be improved.
また、請求項１のヒートポンプ式給湯機によれば、中温湯の温度が設定給湯温度以上のときには、中温湯用出湯管から出湯される中温湯及び出湯管からの高温湯との合流湯と、水供給管からの給水とを混合して給湯し、中温湯の温度が設定給湯温度未満のときには、中温湯用出湯管から出湯される中温湯及び水供給管からの給水の合流水と、貯湯タンクの高温湯とを混合して給湯する。すなわち、中温湯の温度が設定給湯温度以上のときはもちろんであるが、中温湯の温度が設定給湯温度未満であっても、中温湯を優先的に使用することができる。このため、貯湯タンクに溜まる中温湯を使い切ることができる。従って、貯湯タンク内において高温の湯が無くなって沸上運転を行なう場合、ヒートポンプ式加熱源へ安定して低温水を供給することができる。これによって、ＣＯＰの一層の向上を図ることができる。しかも、混合弁が１つであり、制御の簡略化及びコスト低減化を図ることができて、安定した制御が可能となる。このため、設定給湯温度の湯の給湯を確実に行なうことができる。 Further , according to the heat pump type hot water supply apparatus of claim 1 , when the temperature of the medium temperature hot water is equal to or higher than the set hot water temperature, the combined hot water with the medium temperature hot water discharged from the hot water outlet pipe and the high temperature hot water from the outlet pipe; When hot water is mixed with the water supplied from the water supply pipe and the temperature of the medium hot water is lower than the set hot water temperature, the combined water of the hot water discharged from the hot water outlet pipe and the water supplied from the water supply pipe, and hot water storage Mix hot water in the tank and supply hot water. That is, of course, when the temperature of the hot water is equal to or higher than the set hot water temperature, the hot water can be preferentially used even when the temperature of the hot water is lower than the set hot water temperature. For this reason, it is possible to use up the hot water stored in the hot water storage tank. Therefore, when high temperature hot water does not exist in the hot water storage tank and the boiling operation is performed, low temperature water can be stably supplied to the heat pump heating source. As a result, the COP can be further improved. Moreover, since there is only one mixing valve, the control can be simplified and the cost can be reduced, and stable control can be achieved. For this reason, it is possible to reliably perform hot water supply at the set hot water supply temperature.
請求項２のヒートポンプ式給湯機によれば、切換手段が３方弁であるので、中温湯が設定給湯温度以上の場合には中温湯を混合弁の高温側に、また中温湯が設定給湯温度未満の場合には混合弁の低温側への切換供給を確実に行なうことができる。 According to the heat pump type water heater of claim 2 , since the switching means is a three-way valve, when the hot water is equal to or higher than the set hot water temperature, the hot water is set to the high temperature side of the mixing valve, and the hot water is set to the set hot water temperature. If the ratio is less than 1, the switching supply to the low temperature side of the mixing valve can be reliably performed.
請求項３のヒートポンプ式給湯機によれば、冷媒として、炭酸ガス等の自然系冷媒を使用することができるので、一層効率の良い沸上運転を行なうことができる。さらに自然系冷媒を使用することによって、オゾン層の破壊、環境汚染等の問題がなく、地球環境にやさしいヒートポンプ式給湯機となる。 According to the heat pump hot water supply apparatus of claim 3 , since a natural system refrigerant such as carbon dioxide can be used as the refrigerant, a more efficient boiling operation can be performed. Furthermore, by using a natural refrigerant, there is no problem of destruction of the ozone layer, environmental pollution, etc., and the heat pump water heater is friendly to the global environment.
以下、本発明の実施の形態を図面を参照して詳細に説明する。図１はヒートポンプ式給湯機の要部簡略図である。このヒートポンプ式給湯機は、貯湯タンク１を備え、この貯湯タンク１の湯を浴槽に供給（給湯）したり、台所やシャワーに供給（給湯）したりすることができる。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a simplified view of a main part of a heat pump type hot water heater. The heat pump type hot water heater includes a hot water storage tank 1 and can supply (hot water) the hot water of the hot water storage tank 1 to a bathtub or supply (hot water) to a kitchen or a shower.
この場合、冷媒回路Ｓを有する熱源ユニット（ヒートポンプ式加熱源）３を使用して、貯湯タンク１に湯を溜めるものである。冷媒回路Ｓは、圧縮機４と、水熱交換器５と、膨張弁６と、空気熱交換器（蒸発器）７とを順に接続して構成される。そして、貯湯タンク１に循環路８が連結され、この循環路８に、水循環用ポンプ９と熱交換路１０とが介設されている。この場合、熱交換路１０は水熱交換器５にて構成される。この冷媒回路Ｓの冷媒としては、高圧側が超臨界圧力で運転することになる炭酸ガス（ＣＯ２）等を用いる。 In this case, hot water is stored in the hot water storage tank 1 using a heat source unit (heat pump heating source) 3 having a refrigerant circuit S. The refrigerant circuit S is configured by sequentially connecting a compressor 4, a water heat exchanger 5, an expansion valve 6, and an air heat exchanger (evaporator) 7. A circulation path 8 is connected to the hot water storage tank 1, and a water circulation pump 9 and a heat exchange path 10 are interposed in the circulation path 8. In this case, the heat exchange path 10 is constituted by the water heat exchanger 5. As the refrigerant of the refrigerant circuit S, carbon dioxide gas (CO2) or the like whose high pressure side is operated at a supercritical pressure is used.
また、循環路８は、上記水循環用ポンプ９を有する第１循環路１１ａと、この第１循環路１１ａからの湯（加熱水）を貯湯タンク１に戻す第２循環路１１ｂとを備える。第１循環路１１ａは、その一端側が貯湯タンク１の底部に開設された取水口１２に接続され、その他端側が熱交換路１０に接続される。また、第２循環路１１ｂは、その一端側が熱交換路１０に接続され、その他端側が貯湯タンク１の頂部に開設された上部湯入口１３に接続されている。 The circulation path 8 includes a first circulation path 11 a having the water circulation pump 9 and a second circulation path 11 b for returning hot water (heated water) from the first circulation path 11 a to the hot water storage tank 1. One end side of the first circulation path 11 a is connected to a water intake 12 opened at the bottom of the hot water storage tank 1, and the other end side is connected to the heat exchange path 10. The second circulation path 11 b has one end connected to the heat exchange path 10 and the other end connected to an upper hot water inlet 13 established at the top of the hot water storage tank 1.
さらに、貯湯タンク１の上部（頂部）には出湯口１５が開設され、この出湯口１５に高温湯用出湯路（出湯管）１６が接続されると共に、貯湯タンク１の底部に給水口１７が開設され、この給水口１７に給水管１８が接続されている。また、高温湯用出湯管１６には混合弁２１が接続されていて、この混合弁２１の下流側に給湯管２６が接続されている。そして、この給湯管２６から温水が台所の蛇口や洗面所のシャワー等に給湯されるようになっている。 Further, a hot water outlet 15 is opened at the top (top) of the hot water storage tank 1, and a hot water hot water outlet (hot water pipe) 16 is connected to the hot water outlet 15, and a hot water supply port 17 is provided at the bottom of the hot water storage tank 1. A water supply pipe 18 is connected to the water supply port 17. Further, a mixing valve 21 is connected to the hot water outlet pipe 16, and a hot water supply pipe 26 is connected to the downstream side of the mixing valve 21. The hot water is supplied from the hot water supply pipe 26 to a kitchen faucet, a shower in the bathroom, and the like.
また、貯湯タンク１の上下方向略中間部に中温湯出湯口２２が介設され、この中温湯出湯口２２に中温湯用出湯管２３が接続されている。そして、この中温湯用出湯管２３に切換手段２０である切換弁が介設されており、中温湯用出湯管２３は、第１管２３ａと第２管２３ｂとを備えている。中温湯用出湯管２３の第１管２３ａは切換弁２０の一方の出口と高温湯用出湯管１６との間に接続され、第２管２３ｂは切換弁２０の他方の出口と、給水管１８から分岐された分岐管（水供給管）２５に接続されている。そして、この水供給管２５は混合弁２１に接続されている。 Further, an intermediate hot water outlet 22 is provided at a substantially intermediate portion in the vertical direction of the hot water storage tank 1, and an intermediate hot water outlet pipe 23 is connected to the intermediate hot water outlet 22. And the switching valve which is the switching means 20 is interposed in this hot water hot-water supply pipe 23, and the hot water hot-water supply pipe 23 is provided with the 1st pipe | tube 23a and the 2nd pipe | tube 23b. The first pipe 23 a of the hot water outlet pipe 23 is connected between one outlet of the switching valve 20 and the hot water outlet pipe 16, and the second pipe 23 b is connected to the other outlet of the switching valve 20 and the water supply pipe 18. Is connected to a branch pipe (water supply pipe) 25 branched from the pipe. The water supply pipe 25 is connected to the mixing valve 21.
ところで、このヒートポンプ式給湯機には、貯湯タンク１の中温湯出湯口２２の近傍、あるいは中温湯用出湯管２３に配置されて、貯湯タンク１内の中温湯の温度を検出する中温湯用温度検出器２８と、水供給管２５の混合弁２１の近傍であって水供給管２５内に供給される給水管１８からの給水と第２管２３ｂを介して供給される中温湯との合流水の温度を検出する給水／中温湯用温度検出器２９と、混合弁２１より上流側の高温湯用出湯管１６またはその近傍に配置されて、混合弁２１に供給される高温湯用出湯管１６の高温湯と中温湯用出湯管２３からの中温湯との合流湯の温度を検出する高温湯／中温湯用温度検出器３３とを備えている。 By the way, in this heat pump type water heater, the temperature for the medium temperature hot water that is arranged in the vicinity of the medium temperature hot water outlet 22 of the hot water storage tank 1 or in the hot water discharge pipe 23 and detects the temperature of the medium temperature hot water in the hot water storage tank 1. The combined water of the detector 28 and water supplied from the water supply pipe 18 supplied in the water supply pipe 25 in the vicinity of the mixing valve 21 of the water supply pipe 25 and medium-temperature hot water supplied through the second pipe 23b. A temperature detector 29 for water / medium hot water for detecting the temperature of the hot water, and a hot water hot water outlet pipe 16 that is disposed upstream of the mixing valve 21 or in the vicinity thereof and is supplied to the mixing valve 21. And a hot water / medium hot water temperature detector 33 for detecting the temperature of the combined hot water and the hot water from the hot water outlet pipe 23.
そして、上記中温湯用温度検出器２８にて検出されたデータ（検出温度）は、図２に示すように、弁制御手段３０に入力される。また、この弁制御手段３０には、設定給湯温度入力手段３１にて予め設定給湯温度が入力されている。すなわち、弁制御手段３０では、中温湯用温度検出器２８にて検出された温度と、設定給湯温度とを比較して、この比較に基づいて切換弁２０を切換える。この場合、設定給湯温度は、ユーザが希望する給湯温度に近い温度であって、任意に設定することができる。 Then, the data (detected temperature) detected by the temperature detector for medium hot water 28 is input to the valve control means 30 as shown in FIG. Further, the set hot water supply temperature is inputted in advance to the valve control means 30 by the set hot water supply temperature input means 31. That is, the valve control means 30 compares the temperature detected by the medium hot water temperature detector 28 with the set hot water supply temperature, and switches the switching valve 20 based on this comparison. In this case, the set hot water supply temperature is a temperature close to the hot water supply temperature desired by the user, and can be arbitrarily set.
このため、中温湯用温度検出器２８にて検出された温度が設定給湯温度以上であれば、中温湯用出湯管２３から出湯される温湯の温度を下げて給湯する必要があるので、弁制御手段３０は、上記切換弁２０を、中温湯用出湯管２３の第１管２３ａを介して中温湯が混合弁２１の上流側に供給されるように切換えることになる。また、中温湯用温度検出器２８にて検出された温度が設定給湯温度未満であれば、中温湯用出湯管２３から出湯される中温湯の温度を上げて給湯する必要があるので、弁制御手段３０は、上記切換弁２０を、中温湯用出湯管２３の第２管２３ｂと水供給管２５を介して中温湯が混合弁２１に供給するように切換えることになる。なお、この場合の切換弁２０は３方弁が使用される。 For this reason, if the temperature detected by the temperature detector for medium hot water 28 is equal to or higher than the set hot water supply temperature, it is necessary to lower the temperature of the hot water discharged from the hot water discharge pipe 23 for hot water supply. The means 30 switches the switching valve 20 so that the hot water is supplied to the upstream side of the mixing valve 21 through the first pipe 23 a of the hot water outlet pipe 23. Further, if the temperature detected by the intermediate temperature hot water temperature detector 28 is lower than the set hot water supply temperature, it is necessary to raise the temperature of the intermediate temperature hot water discharged from the intermediate temperature hot water discharge pipe 23, so that the valve control is performed. The means 30 switches the switching valve 20 so that the hot water is supplied to the mixing valve 21 via the second pipe 23b of the hot water outlet pipe 23 and the water supply pipe 25. In this case, a three-way valve is used as the switching valve 20.
本発明では、貯湯タンク１内の中温湯の温度が設定給湯温度より高い場合には、中温湯出湯口２２より切換弁２０及び第１管２３ａを介した中温湯と高温湯用出湯管１６からの高温湯の合流湯と、水供給管２５からの給水とを混合弁２１にて混合し、混合弁２１にて設定給湯温度に混合した温水を給湯管２６より給湯するようにしている。また、貯湯タンク１内の中温湯の温度が設定給湯温度より低い場合には、温湯出湯口２２より切換弁２０、第２管２３ｂからの中温湯と水供給管２５からの給水との合流水と、貯湯タンク１からの高温湯用出湯管１６内の高温湯とを混合弁２１にて混合し、混合弁２１にて設定給湯温度に混合した温水を給湯管２６より給湯するようにしている。 In the present invention, when the temperature of the medium temperature hot water in the hot water storage tank 1 is higher than the set hot water supply temperature, from the medium temperature hot water outlet 22 through the switching valve 20 and the first pipe 23a from the medium temperature hot water and the hot water outlet pipe 16. The hot water mixed with the hot water and the feed water from the water supply pipe 25 are mixed by the mixing valve 21, and hot water mixed at the set hot water temperature by the mixing valve 21 is supplied from the hot water supply pipe 26. When the temperature of the hot water in the hot water storage tank 1 is lower than the set hot water supply temperature, the combined water of the hot water outlet 22 and the hot water from the hot water outlet 22 and the hot water from the second pipe 23 b and the water supply from the water supply pipe 25. The hot water in the hot water outlet pipe 16 from the hot water storage tank 1 is mixed by the mixing valve 21, and hot water mixed at the set hot water temperature by the mixing valve 21 is supplied from the hot water supply pipe 26. .
従って、貯湯タンク１内の中温湯が設定給湯温度より高い場合でも、また低い場合でも、給湯管２６に供給される温水の温度を設定給湯温度に一定にすべく、給水／中温湯用温度検出器２９と高温湯／中温湯用温度検出器３３からの温度データを取り込んで、混合弁２１での混合比率を制御（調整）するようにしている。 Accordingly, even when the medium temperature hot water in the hot water storage tank 1 is higher or lower than the set hot water supply temperature, the temperature detection for the hot water / medium hot water is made to keep the temperature of the hot water supplied to the hot water supply pipe 26 constant. The temperature data from the container 29 and the temperature detector 33 for hot / medium hot water is taken in, and the mixing ratio in the mixing valve 21 is controlled (adjusted).
すなわち、図３に示すように、混合弁２１には、混合比率を制御（調整）する調整手段３２が接続される。この調整手段３２には、上記給水／中温湯用温度検出器２９、高温湯／中温湯用温度検出器３３にて検出されたデータ（検出温度）が入力されると共に、設定給湯温度入力手段３１から設定給湯温度が入力される。なお、この設定給湯温度入力手段３１での設定給湯温度設定は、図示省略の操作部（操作パネル）の設定ボタンを操作することによって行うことができる。 That is, as shown in FIG. 3, the mixing valve 21 is connected to an adjusting means 32 that controls (adjusts) the mixing ratio. The adjustment means 32 is supplied with data (detection temperature) detected by the temperature detector 29 for hot water / medium hot water and the temperature detector 33 for hot water / medium hot water, and the set hot water temperature input means 31. The set hot water temperature is input. The set hot water temperature setting by the set hot water temperature input means 31 can be performed by operating a setting button on an operation unit (operation panel) (not shown).
このため、調整手段３２では、混合弁２１の上流側の高温湯用出湯管１６内の高温湯の温度または高温湯と中温湯との合流湯の温度と、水供給管２５の給水の温度または給水と中温湯の合流水の温度と、設定給湯温度入力手段３１からの設定給湯温度とに基づいて、混合弁２１の混合比率を調整する。従って、給湯管２６に接続された図示省略の蛇口（栓）等を開状態とすることによって、設定給湯温度（又はこの設定給湯温度に近い温度）の湯を給湯できる。 For this reason, in the adjustment means 32, the temperature of the hot water in the hot water outlet pipe 16 on the upstream side of the mixing valve 21 or the temperature of the combined hot water of the hot and medium hot water and the temperature of the water supply in the water supply pipe 25 or The mixing ratio of the mixing valve 21 is adjusted based on the temperature of the combined water of the hot water and the medium hot water and the set hot water temperature from the set hot water temperature input means 31. Therefore, by opening a not-shown faucet (plug) connected to the hot water supply pipe 26, hot water at the set hot water supply temperature (or a temperature close to the set hot water supply temperature) can be supplied.
ところで、風呂の追焚きや保温のための熱源として、この貯湯タンク１の湯が使用される。すなわち、図１に示すように、貯湯タンク１の上部に湯流出口３５と、貯湯タンク１の下部に湯流入口３６とを開設し、この湯流出口３５と湯流入口３６とを湯循環路３７を介して接続する。湯循環路３７には、循環用ポンプ３８と、外部熱交換器３９にて構成される熱交換路４０とが介設されている。そして、浴槽（図示）には追い焚き用循環路４２が接続されている。この追い焚き用循環路４２には、上記外部熱交換器３９にて構成される熱交換路４３と、風呂湯循環用ポンプ（図示省略）が介設されている。 By the way, the hot water of the hot water storage tank 1 is used as a heat source for chasing the bath and keeping warm. That is, as shown in FIG. 1, a hot water outlet 35 is provided at the upper part of the hot water storage tank 1, and a hot water inlet 36 is provided at the lower part of the hot water storage tank 1, and the hot water outlet 35 and the hot water inlet 36 are circulated with hot water. Connect via the path 37. The hot water circulation path 37 is provided with a circulation pump 38 and a heat exchange path 40 constituted by an external heat exchanger 39. A recirculation circuit 42 is connected to the bathtub (shown). The recirculation circulation path 42 is provided with a heat exchange path 43 constituted by the external heat exchanger 39 and a bath water circulation pump (not shown).
次に、このヒートポンプ式給湯機の沸上運転を説明する。圧縮機４を駆動すると共に、水循環用ポンプ９を駆動する。すると、貯湯タンク１の底部に設けた取水口１２から貯溜水（温水）が循環路８に流出して、これが循環路８の熱交換路１０を流通する。また、圧縮機４からの吐出冷媒が、水熱交換器５、膨張弁６、空気熱交換器７を順次経由して圧縮機４へと返流する。そのため、循環路８の熱交換路１０を流通する水が水熱交換器５によって加熱される。従って、貯湯タンク１の底部の低温水は取水口１２から流出して、水熱交換器５にて加熱されて高温湯となって、上部湯入口１３から返流される。このような動作を継続して行うことによって、貯湯タンク１に高温湯を貯めることができる。 Next, the boiling operation of this heat pump type hot water heater will be described. While driving the compressor 4, the water circulation pump 9 is driven. Then, stored water (hot water) flows out from the water intake 12 provided at the bottom of the hot water storage tank 1 to the circulation path 8, and this flows through the heat exchange path 10 of the circulation path 8. Further, the refrigerant discharged from the compressor 4 returns to the compressor 4 through the water heat exchanger 5, the expansion valve 6, and the air heat exchanger 7 in order. Therefore, the water flowing through the heat exchange path 10 of the circulation path 8 is heated by the water heat exchanger 5. Accordingly, the low temperature water at the bottom of the hot water storage tank 1 flows out from the water intake 12, is heated by the water heat exchanger 5 to become high temperature hot water, and is returned from the upper hot water inlet 13. By continuously performing such an operation, hot water can be stored in the hot water storage tank 1.
また、風呂の追焚きや保温する場合、循環用ポンプ３８を駆動して、貯湯タンク１の高温の湯を湯流出口３５から湯循環路３７に出湯させて、湯流入口３６から貯湯タンク１に戻す。この際、追い焚き用循環路４２の循環ポンプを駆動して、浴槽の湯を追い焚き用循環路４２において循環させる。これによって、貯湯タンク１の高温の湯が熱交換路４０を流れると共に、浴槽から流出した湯が熱交換路４３を流れる。この際、浴槽から流出した湯は、貯湯タンク１の高温の湯と熱交換することによって暖められて浴槽に戻る。また、貯湯タンク１から流出した高温の湯は、浴槽から流出した湯と熱交換することによって冷やされて、例えば、３０℃〜５０℃程度の中間温度の温水（中温湯）となって貯湯タンク１に戻る。このため、貯湯タンク１の中間部には中温湯が貯まることになる。 When bathing or keeping warm, the circulating pump 38 is driven to discharge hot water from the hot water storage tank 1 from the hot water outlet 35 to the hot water circulation path 37, and from the hot water inlet 36 to the hot water storage tank 1. Return to. At this time, the circulation pump of the reheating circulation path 42 is driven to circulate the hot water in the bathtub in the recirculation circulation path 42. Accordingly, hot water in the hot water storage tank 1 flows through the heat exchange path 40, and hot water that has flowed out of the bathtub flows through the heat exchange path 43. At this time, the hot water flowing out of the bathtub is warmed by exchanging heat with the hot water in the hot water storage tank 1 and returned to the bathtub. The hot water flowing out of the hot water storage tank 1 is cooled by exchanging heat with the hot water flowing out of the bathtub, and becomes hot water (medium temperature hot water) having an intermediate temperature of about 30 ° C. to 50 ° C., for example. Return to 1. For this reason, the intermediate temperature hot water is stored in the intermediate portion of the hot water storage tank 1.
そこで、このヒートポンプ式給湯機では、このように貯まった中温湯を優先的に使用できるようにしている。すなわち、給湯管２６から給湯する場合、図４に示すフローチャート図に従って行われることになる。そして、給湯は、給湯管２６に接続された蛇口を開状態とする。これによって、給湯されることになるが、この際、以下のような制御が行われる。まず、貯湯タンク１内の中温湯の温度を中温湯用温度検出器２２にて検出する（ステップＳ１）。次にステップＳ２へ移行して、このステップＳ２にて中温湯の温度が設定給湯温度以上か否かを判断する。そして、設定給湯温度以上であれば、ステップＳ３へ移行して、中温湯が第１管２３ａを介して混合弁２１へ供給するように切換弁２０を切換えてステップＳ５へ移行する。また、ステップＳ２で中温湯の温度が設定給湯温度未満であれば、ステップＳ４へ移行して、中温湯が第２管２３ｂを介して混合弁２１に供給されるように切換弁２０を切換えてステップＳ６へ移行する。 Therefore, in this heat pump type hot water heater, the medium temperature hot water stored in this way can be preferentially used. That is, when hot water is supplied from the hot water supply pipe 26, it is performed according to the flowchart shown in FIG. The hot water supply opens the faucet connected to the hot water supply pipe 26. As a result, hot water is supplied. At this time, the following control is performed. First, the temperature of the hot water in the hot water storage tank 1 is detected by the hot water temperature detector 22 (step S1). Next, the process proceeds to step S2, where it is determined whether or not the temperature of the medium hot water is equal to or higher than the set hot water supply temperature. And if it is more than setting hot water supply temperature, it will transfer to step S3, will change the switching valve 20 so that medium temperature hot water may be supplied to the mixing valve 21 via the 1st pipe | tube 23a, and will transfer to step S5. If the temperature of the hot water is lower than the set hot water temperature in step S2, the process proceeds to step S4 and the switching valve 20 is switched so that the hot water is supplied to the mixing valve 21 through the second pipe 23b. The process proceeds to step S6.
ステップＳ５では高温湯及び中温湯の合流湯と、給水との混合比率を調整して、ステップＳ７へ移行して、設定給湯温度の湯を給湯する。また、ステップＳ６では高温湯と、中温湯及び給水の合流水との混合比率を調整して、ステップＳ７へ移行して設定給湯温度の湯を給湯する。なお、給湯を終了する場合には、給湯管２６に接続されている蛇口を閉状態とすればよい。 In step S5, the mixing ratio of the hot water and the mixed hot water of medium hot water and the feed water is adjusted, and the process proceeds to step S7 to supply hot water having the set hot water temperature. In step S6, the mixing ratio of the high temperature hot water, the middle temperature hot water and the combined water of the hot water supply is adjusted, and the process proceeds to step S7 to supply hot water at the set hot water temperature. In addition, what is necessary is just to make the faucet connected to the hot water supply pipe 26 into a closed state, when ending hot water supply.
上記ヒートポンプ式給湯機では、中温湯用出湯管２３から出湯される中温湯と水供給管２５からの給水とを混合して給湯したり、中温湯用出湯管２３から出湯される中温湯と高温湯用出湯管１６からの高温湯とを混合して給湯したりすることができる。このため、中温湯用出湯管２３からの中温湯を有効に使用することができ、貯湯タンク１内において高温の湯が無くなって沸上運転を行なう場合、ヒートポンプ式加熱源へ中温湯を供給することなく低温水を供給することができる。すなわち、沸上効率の悪い中温湯を無くして、ＣＯＰの向上を図ることができる。 In the heat pump water heater, the hot water discharged from the hot water outlet pipe 23 is mixed with the hot water supplied from the water supply pipe 25, or the hot water discharged from the hot water hot pipe 23 and the hot water are mixed. Hot water from the hot water discharge pipe 16 can be mixed and supplied. For this reason, the hot water from the hot water outlet pipe 23 can be used effectively, and when hot water is run out in the hot water storage tank 1 and the boiling operation is performed, the hot water is supplied to the heat pump heating source. Low temperature water can be supplied without any problems. That is, the COP can be improved by eliminating the hot water with low boiling efficiency.
特に、中温湯の温度が設定給湯温度以上のときには、中温湯用出湯管２３の第１管２３ａから出湯される中温湯及び高温湯用出湯管１６からの高温湯の合流湯と、水供給管２５からの給水とを混合して給湯し、中温湯の温度が設定給湯温度未満のときには、貯湯タンク１の高温湯と、中温湯用出湯管２３の第２管２３ｂから出湯される中温湯及び水供給管２５からの給水との合流水とを混合して給湯する。すなわち、中温湯の温度が設定給湯温度以上のときはもちろんであるが、中温湯の温度が設定給湯温度未満であっても、中温湯を優先的に使用することができる。このため、貯湯タンク１に溜まる中温湯を使い切ることができる。従って、貯湯タンク１内において高温の湯が無くなって沸上運転を行なう場合、ヒートポンプ式加熱源へ安定して低温水を供給することができる。これによって、ＣＯＰの一層の向上を図ることができる。しかも、混合弁２１が１つであり、制御の簡略化及びコスト低減化を図ることができて、安定した制御が可能となる。このため、設定給湯温度の湯の給湯を確実に行なうことができる。また、切換弁２０が３方弁であるので、中温湯が設定給湯温度以上の場合には中温湯を混合弁２１の高温側に、また中温湯が設定給湯温度未満の場合には混合弁２１の低温側への切換供給を確実に行なうことができる。 In particular, when the temperature of the intermediate hot water is equal to or higher than the set hot water supply temperature, the hot water combined hot water from the first hot water outlet pipe 23a of the intermediate hot water outlet pipe 23 and the hot water hot water outlet pipe 16, and the water supply pipe When the temperature of the intermediate temperature hot water is lower than the set hot water temperature, the hot water in the hot water storage tank 1 and the intermediate temperature hot water discharged from the second pipe 23b of the hot water outlet pipe 23 and Hot water is mixed with the combined water with the water supplied from the water supply pipe 25. That is, of course, when the temperature of the hot water is equal to or higher than the set hot water temperature, the hot water can be preferentially used even when the temperature of the hot water is lower than the set hot water temperature. For this reason, the hot water stored in the hot water storage tank 1 can be used up. Therefore, when high temperature hot water does not exist in the hot water storage tank 1 and the boiling operation is performed, low temperature water can be stably supplied to the heat pump heating source. As a result, the COP can be further improved. In addition, since there is only one mixing valve 21, the control can be simplified and the cost can be reduced, and stable control can be achieved. For this reason, it is possible to reliably perform hot water supply at the set hot water supply temperature. Further, since the switching valve 20 is a three-way valve, when the hot water is higher than the set hot water temperature, the hot water is on the high temperature side of the mixing valve 21, and when the hot water is lower than the set hot water temperature, the mixing valve 21 is used. Can be reliably switched to the low temperature side.
さらに、冷媒として、炭酸ガス等の自然系冷媒を使用することができるので、一層効率の良い沸上運転を行なうことができる。また、自然系冷媒を使用することによって、オゾン層の破壊、環境汚染等の問題がなく、地球環境にやさしいヒートポンプ式給湯機となる。 Furthermore, since a natural refrigerant such as carbon dioxide can be used as the refrigerant, a more efficient boiling operation can be performed. In addition, by using a natural refrigerant, there is no problem such as destruction of the ozone layer and environmental pollution, and the heat pump water heater is friendly to the global environment.
以上にこの発明の具体的な実施の形態について説明したが、この発明は上記形態に限定されるものではなく、この発明の範囲内で種々変更して実施することができる。例えば、中温湯の温度としては上記実施形態では３０℃〜５０℃程度としていたが、もちろんこれに限るものではなく、このヒートポンプ式給湯機における中温湯の温度とは、沸上効率を低下させることになる範囲の温度をいう。また、設定給湯温度は給湯温度を決定するものであり、ユーザーによって任意の温度を設定することができる。しかも、この設定給湯温度が種々に設定されても、このヒートポンプ式給湯機では、中温湯（沸上効率を低下させることになる範囲の温度の湯）を優先的に使用することができる。さらに、切換弁２０として、実施形態では３方弁を使用したが、３方弁を使用することなく複数の開閉弁を備えた切換回路等にて構成してもよい。なお、冷媒回路Ｓの冷媒として、炭酸ガス以外のエチレン、エタン、酸化窒素等の自然系冷媒であってもよく、さらには、ジクロロジフルオロメタン（Ｒ−１２）やクロロジフルオロメタン（Ｒ−２２）や、１，１，１，２−テトラフルオロエタン（Ｒ−１３４ａ）等のような冷媒であってもよい。 Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the temperature of the hot water is about 30 ° C. to 50 ° C. in the above embodiment, but is not limited to this, and the temperature of the hot water in this heat pump type hot water heater is to lower the boiling efficiency. The temperature in the range. Further, the set hot water temperature determines the hot water temperature, and an arbitrary temperature can be set by the user. Moreover, even if the set hot water temperature is variously set, the heat pump type hot water heater can preferentially use hot water (hot water in a range where boiling efficiency is lowered). Furthermore, although the three-way valve is used as the switching valve 20 in the embodiment, it may be configured by a switching circuit having a plurality of on-off valves without using the three-way valve. The refrigerant of the refrigerant circuit S may be a natural refrigerant such as ethylene, ethane, or nitric oxide other than carbon dioxide, and further dichlorodifluoromethane (R-12) or chlorodifluoromethane (R-22). Alternatively, a refrigerant such as 1,1,1,2-tetrafluoroethane (R-134a) may be used.
１・・貯湯タンク、３・・ヒートポンプ式加熱源、１６・・高温湯用出湯管、２０・・切換手段、２１・・混合弁、２３・・中温湯用出湯管、２５・・水供給管、２６・・給湯管、３０・・弁制御手段、３２・・調整手段 1. Hot water storage tank, 3. Heat pump type heat source, 16. Hot water outlet pipe, 20. Switching means, 21 Mixing valve, 23 Hot water outlet pipe, 25 Water supply pipe , 26 ·· Hot water pipes, 30 · · Valve control means, 32 · · Adjustment means
Claims (3)
上記貯湯タンク（１）の上部の高温湯を出湯する出湯管（１６）と、この出湯管（１６）と低温水を供給する水供給管（２５）とを接続する混合弁（２１）と、上記貯湯タンク（１）の中温湯を出湯する中温湯用出湯管（２３）と、この中温湯用出湯管（２３）に介設されて中温湯の供給を上記出湯管（１６）側または水供給管（２５）側に切換える切換手段（２０）と、上記混合弁（２１）に接続される給湯管（２６）とを備え、さらに上記中温湯の温度が設定給湯温度以上のときには上記中温湯用出湯管（２３）からの中温湯を出湯管（１６）を介して混合弁（２１）に供給すると共に、上記中温湯の温度が設定給湯温度未満のときには上記中温湯用出湯管（２３）からの中温湯を水供給管（２５）を介して混合弁（２１）に供給するように上記切換手段（２０）を切換え制御する弁制御手段（３０）を有し、
給湯時において中温湯用出湯管（２３）から出湯された中温湯及び出湯管（１６）からの高温湯との合流湯と、上記水供給管（２５）からの給水との混合弁（２１）における混合比率、または上記貯湯タンク（１）からの高温湯と、中温湯及び水供給管（２５）からの給水の合流水との混合弁（２１）における混合比率を制御して上記設定給湯温度の湯の給湯を行なうことを特徴とするヒートポンプ式給湯機。 A heat pump water heater that performs a boiling operation in which low-temperature water flows out from the bottom of the hot water storage tank (1), the low-temperature water is boiled by the heat pump heating source (3) and returned to the top of the hot water storage tank (1). There,
A tapping pipe (16) for tapping hot water at the top of the hot water storage tank (1), and a mixing valve (21) for connecting the tapping pipe (16) and a water supply pipe (25) for feeding low temperature water; The hot water outlet pipe (23) for discharging the hot water in the hot water storage tank (1) and the hot water outlet pipe (23) are connected to the hot water pipe (16) side or water. A switching means (20) for switching to the supply pipe (25) side and a hot water supply pipe (26) connected to the mixing valve (21) are provided , and when the temperature of the intermediate hot water is equal to or higher than a set hot water temperature, the intermediate hot water is provided. The hot water from the hot water supply pipe (23) is supplied to the mixing valve (21) through the hot water pipe (16), and the hot water hot water discharge pipe (23) when the temperature of the hot water is lower than the set hot water temperature. The hot water from the water is supplied to the mixing valve (21) through the water supply pipe (25). Has the switching means (20) valve control means (30) for switching control to,
A mixing valve (21) for mixing hot water from the hot water discharged from the hot water outlet pipe (23) and hot water from the hot water pipe (16) and hot water from the water supply pipe (25) at the time of hot water supply. Or a mixing ratio in the mixing valve (21) of the hot water from the hot water storage tank (1) and the combined water of the hot water from the medium temperature hot water and the water supply pipe (25) to control the set hot water temperature A heat pump type water heater characterized by supplying hot water.
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| JP2004144381A (en) * | 2002-10-23 | 2004-05-20 | Denso Corp | Mixing valve for hot water storage type hot water supply device |
| JP2004197958A (en) * | 2002-12-16 | 2004-07-15 | Corona Corp | Storage water heater |
| JP2006250367A (en) * | 2005-03-08 | 2006-09-21 | Matsushita Electric Ind Co Ltd | Heat pump water heater |
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| JP2002364928A (en) * | 2001-04-04 | 2002-12-18 | Sekisui Chem Co Ltd | Hot-water storage tank water-supply system |
| JP2004144381A (en) * | 2002-10-23 | 2004-05-20 | Denso Corp | Mixing valve for hot water storage type hot water supply device |
| JP2004197958A (en) * | 2002-12-16 | 2004-07-15 | Corona Corp | Storage water heater |
| JP2006250367A (en) * | 2005-03-08 | 2006-09-21 | Matsushita Electric Ind Co Ltd | Heat pump water heater |
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