JP2013224786A - Heat pump water heater - Google Patents

Heat pump water heater Download PDF

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JP2013224786A
JP2013224786A JP2012097027A JP2012097027A JP2013224786A JP 2013224786 A JP2013224786 A JP 2013224786A JP 2012097027 A JP2012097027 A JP 2012097027A JP 2012097027 A JP2012097027 A JP 2012097027A JP 2013224786 A JP2013224786 A JP 2013224786A
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temperature
water
hot water
heat exchanger
refrigerant
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JP5938260B2 (en
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Hiroaki Sasaki
宏明 佐々木
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Rinnai Corp
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Rinnai Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F24H4/04—Storage heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/02—Domestic hot-water supply systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/042—Temperature sensors

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a technology that can secure durability of a compressor, in a heat pump water heater.SOLUTION: A heat pump water heater comprises: a compressor 22; a water heat exchanger 24; an expansion valve 26; an air heat exchanger 28; a coolant circulation passage; an air blowing face 30 for supplying outside air to the air heat exchanger; a pump 32 for supplying water to the water heat exchanger; and a boil-up temperature detection means 34 for detecting a temperature of water which has passed through the water heat exchanger. The heat pump water heater adjusts an opening of the expansion valve, the number of revolutions of the air blowing fan and the number of revolutions of a pump so that the boil-up temperature reaches a boil-up set temperature. The heat pump water heater further comprises an outside air temperature detection means 38 for detecting an outside air temperature. When the outside air temperature exceeds a first prescribed temperature, the heat pump water heater raises the boil-up set temperature. When the outside air temperature exceeds a second prescribed temperature, the heat pump water heater reduces the number of revolutions of the compressor.

Description

本発明は、ヒートポンプ給湯器に関する。   The present invention relates to a heat pump water heater.

特許文献１に、ヒートポンプ給湯器が開示されている。そのヒートポンプ給湯器は、冷媒を圧縮する圧縮機と、冷媒と水との間で熱交換する水熱交換器と、冷媒を膨脹させる膨脹弁と、冷媒と空気との間で熱交換する空気熱交換器と、冷媒を圧縮機、水熱交換器、膨脹弁、空気熱交換器の順に循環させる冷媒循環経路と、空気熱交換器に外気を供給する送風ファンと、水熱交換器に水を供給するポンプと、水熱交換器を通過した水の温度を沸き上げ温度として検出する沸き上げ温度検出手段を備えている。そのヒートポンプ給湯器では、沸き上げ温度が沸き上げ設定温度となるように、膨脹弁の開度と、送風ファンの回転数と、ポンプの回転数を調整する。   Patent Document 1 discloses a heat pump water heater. The heat pump water heater includes a compressor that compresses refrigerant, a water heat exchanger that exchanges heat between the refrigerant and water, an expansion valve that expands the refrigerant, and air heat that exchanges heat between the refrigerant and air. An exchanger, a refrigerant circulation path for circulating refrigerant in order of a compressor, a water heat exchanger, an expansion valve, and an air heat exchanger, a blower fan for supplying outside air to the air heat exchanger, and water for the water heat exchanger A pump to be supplied and a boiling temperature detecting means for detecting the temperature of water that has passed through the water heat exchanger as the boiling temperature. In the heat pump water heater, the opening degree of the expansion valve, the rotational speed of the blower fan, and the rotational speed of the pump are adjusted so that the boiling temperature becomes the boiling preset temperature.

特開２００７−１９８６３２号公報JP 2007-198632 A

夏場のように、外気温が高い状況でヒートポンプを動作させると、圧縮機に流入する冷媒の圧力が上昇し、圧縮機における冷媒の圧力および温度の上昇を招いてしまう。さらに、高温の外気に曝されることで、圧縮機そのものの温度も上昇する。圧縮機を高温・高圧の状態で長時間動作させると、構成部品の劣化を招き、圧縮機の耐久性を損なうことになってしまう。ヒートポンプ給湯器において、圧縮機の耐久性を確保することが可能な技術が待望されている。   If the heat pump is operated in a situation where the outside air temperature is high as in summer, the pressure of the refrigerant flowing into the compressor increases, leading to an increase in the pressure and temperature of the refrigerant in the compressor. Furthermore, the temperature of the compressor itself increases due to exposure to high temperature outside air. If the compressor is operated for a long time at a high temperature and a high pressure, the components are deteriorated and the durability of the compressor is impaired. In a heat pump water heater, a technology that can ensure the durability of the compressor is desired.

本明細書は、上記の課題を解決する技術を提供する。本明細書は、ヒートポンプ給湯器において、圧縮機の耐久性を確保することが可能な技術を提供する。   The present specification provides a technique for solving the above problems. This specification provides the technology which can ensure the durability of a compressor in a heat pump water heater.

本明細書は、ヒートポンプ給湯器を開示する。そのヒートポンプ給湯器は、冷媒を圧縮する圧縮機と、冷媒と水との間で熱交換する水熱交換器と、冷媒を膨脹させる膨脹弁と、冷媒と空気との間で熱交換する空気熱交換器と、冷媒を圧縮機、水熱交換器、膨脹弁、空気熱交換器の順に循環させる冷媒循環経路と、空気熱交換器に外気を供給する送風ファンと、水熱交換器に水を供給するポンプと、水熱交換器を通過した水の温度を沸き上げ温度として検出する沸き上げ温度検出手段を備えている。そのヒートポンプ給湯器は、沸き上げ温度が沸き上げ設定温度となるように、膨脹弁の開度と、送風ファンの回転数と、ポンプの回転数を調整する。そのヒートポンプ給湯器は、外気温を検出する外気温検出手段をさらに備えている。そのヒートポンプ給湯器は、外気温が第１所定温度を超える場合に、沸き上げ設定温度を上昇させる。そのヒートポンプ給湯器は、外気温が第２所定温度を超える場合に、圧縮機の回転数を低減させる。   This specification discloses a heat pump water heater. The heat pump water heater includes a compressor that compresses refrigerant, a water heat exchanger that exchanges heat between the refrigerant and water, an expansion valve that expands the refrigerant, and air heat that exchanges heat between the refrigerant and air. An exchanger, a refrigerant circulation path for circulating refrigerant in order of a compressor, a water heat exchanger, an expansion valve, and an air heat exchanger, a blower fan for supplying outside air to the air heat exchanger, and water for the water heat exchanger A pump to be supplied and a boiling temperature detecting means for detecting the temperature of water that has passed through the water heat exchanger as the boiling temperature. The heat pump water heater adjusts the opening degree of the expansion valve, the rotational speed of the blower fan, and the rotational speed of the pump so that the boiling temperature becomes the boiling preset temperature. The heat pump water heater further includes an outside air temperature detecting means for detecting the outside air temperature. The heat pump water heater raises the boiling set temperature when the outside air temperature exceeds the first predetermined temperature. The heat pump water heater reduces the rotational speed of the compressor when the outside air temperature exceeds the second predetermined temperature.

上記のヒートポンプ給湯器では、外気温が第１所定温度を超える場合に、沸き上げ設定温度を上昇させる。これにより、圧縮機における冷媒の圧力および温度の上昇を抑制することができる。また、上記のヒートポンプ給湯器では、外気温が第２所定温度を超える場合に、圧縮機の回転数を低減させる。これにより、圧縮機における冷媒の圧力および温度の上昇を抑制することができる。第１所定温度と第２所定温度は、同じ温度であってもよいし、異なる温度であってもよい。上記のヒートポンプ給湯器によれば、圧縮機を高温・高圧のもとで動作させる事態を抑制することで、圧縮機の耐久性を確保することができる。   In the above heat pump water heater, when the outside air temperature exceeds the first predetermined temperature, the boiling set temperature is raised. Thereby, the raise of the pressure and temperature of the refrigerant | coolant in a compressor can be suppressed. Moreover, in said heat pump water heater, when external temperature exceeds 2nd predetermined temperature, the rotation speed of a compressor is reduced. Thereby, the raise of the pressure and temperature of the refrigerant | coolant in a compressor can be suppressed. The first predetermined temperature and the second predetermined temperature may be the same temperature or different temperatures. According to said heat pump water heater, durability of a compressor can be ensured by suppressing the situation where a compressor is operated under high temperature and high pressure.

本明細書が開示する他のヒートポンプ給湯器は、冷媒を圧縮する圧縮機と、冷媒と水との間で熱交換する水熱交換器と、冷媒を膨脹させる膨脹弁と、冷媒と空気との間で熱交換する空気熱交換器と、冷媒を圧縮機、水熱交換器、膨脹弁、空気熱交換器の順に循環させる冷媒循環経路と、空気熱交換器に外気を供給する送風ファンと、底部から水を水熱交換器へ送り出し、水熱交換器を通過した水を頂部から受け入れる貯湯槽と、水熱交換器と貯湯槽の間で水を循環させる循環ポンプと、水熱交換器を通過した水の温度を沸き上げ温度として検出する沸き上げ温度検出手段を備えている。そのヒートポンプ給湯器は、沸き上げ温度が沸き上げ設定温度となるように、膨脹弁の開度と、送風ファンの回転数と、ポンプの回転数を調整する。そのヒートポンプ給湯器は、沸き上げ設定温度を水の殺菌温度として、貯湯槽の水を殺菌する殺菌運転を実施可能に構成されている。そのヒートポンプ給湯器は、外気温を検出する外気温検出手段をさらに備えている。そのヒートポンプ給湯器は、外気温が所定温度を超える場合に、殺菌運転を禁止する。   Another heat pump water heater disclosed in this specification includes a compressor that compresses refrigerant, a water heat exchanger that exchanges heat between the refrigerant and water, an expansion valve that expands the refrigerant, and refrigerant and air. An air heat exchanger that exchanges heat between the refrigerant, a refrigerant circulation path that circulates the refrigerant in the order of the compressor, the water heat exchanger, the expansion valve, and the air heat exchanger, a blower fan that supplies outside air to the air heat exchanger, A hot water tank that sends water from the bottom to the water heat exchanger and receives the water that has passed through the water heat exchanger from the top, a circulation pump that circulates water between the water heat exchanger and the hot water tank, and a water heat exchanger A boiling temperature detecting means for detecting the temperature of the passed water as the boiling temperature is provided. The heat pump water heater adjusts the opening degree of the expansion valve, the rotational speed of the blower fan, and the rotational speed of the pump so that the boiling temperature becomes the boiling preset temperature. The heat pump water heater is configured to be capable of performing a sterilization operation for sterilizing water in a hot water tank with the boiling set temperature as a water sterilization temperature. The heat pump water heater further includes an outside air temperature detecting means for detecting the outside air temperature. The heat pump water heater prohibits sterilization operation when the outside air temperature exceeds a predetermined temperature.

上記のヒートポンプ給湯器では、外気温が高い場合に殺菌運転を禁止することで、圧縮機が高温・高圧のもとで動作する機会を低減することができる。上記のヒートポンプ給湯器によれば、圧縮機の耐久性を確保することができる。   In the above heat pump water heater, the sterilization operation is prohibited when the outside air temperature is high, so that the opportunity for the compressor to operate under high temperature and high pressure can be reduced. According to the above heat pump water heater, the durability of the compressor can be ensured.

上記のヒートポンプ給湯器では、直前の殺菌運転の実施から第１所定時間が経過した場合に、次の殺菌運転が実施されるまで、貯湯槽からの給湯を禁止することが好ましい。   In the above heat pump water heater, it is preferable to prohibit hot water supply from the hot water storage tank until the next sterilization operation is performed after the first predetermined time has elapsed since the previous sterilization operation.

殺菌運転を禁止することで、殺菌運転が実施されずに長期間が経過すると、貯湯槽の内部の水に雑菌が繁殖するおそれがある。上記のヒートポンプ給湯器によれば、このように貯湯槽の内部の水に雑菌が繁殖しているおそれがある場合に、貯湯槽からの給湯を禁止することで、利用者の安全性を確保することができる。   By prohibiting the sterilization operation, if the sterilization operation is not carried out and a long period of time elapses, there is a possibility that various germs may propagate in the water in the hot water tank. According to the above heat pump water heater, in the case where there is a possibility that various germs are propagated in the water inside the hot water tank, the hot water supply from the hot water tank is prohibited to ensure the safety of the user. be able to.

上記のヒートポンプ給湯器では、直前の殺菌運転の実施から第１所定時間が経過しており、かつ次の殺菌運転が実施される前であっても、直前の貯湯槽からの給湯から第２所定時間が経過していなければ、貯湯槽からの給湯を許可することが好ましい。   In the above heat pump water heater, even if the first predetermined time has elapsed since the execution of the previous sterilization operation and before the next sterilization operation is performed, the second predetermined time from the hot water supply from the immediately preceding hot water storage tank. If the time has not passed, it is preferable to allow hot water supply from the hot water tank.

殺菌運転が実施されずに長期間が経過した場合でも、貯湯槽からの給湯が継続的に行われて、貯湯槽の内部の水の入れ換えがされている場合には、貯湯槽の内部の水に雑菌が繁殖するおそれはほとんどない。上記のヒートポンプ給湯器によれば、このように貯湯槽の内部の水に雑菌が繁殖しているおそれがほとんどない場合に、貯湯槽からの給湯を許可することで、利用者の利便性を確保することができる。   Even if the sterilization operation is not carried out and a long period of time has passed, if the hot water supply from the hot water tank is continuously performed and the water inside the hot water tank is replaced, the water inside the hot water tank There is almost no risk of germs breeding. According to the above heat pump water heater, when there is almost no risk of germs breeding in the water inside the hot water tank, the user's convenience is ensured by permitting hot water from the hot water tank. can do.

本明細書が開示する技術によれば、ヒートポンプ給湯器において、圧縮機の耐久性を確保することができる。   According to the technology disclosed in this specification, the durability of the compressor can be ensured in the heat pump water heater.

給湯システム１０の構成を模式的に示す図である。1 is a diagram schematically showing a configuration of a hot water supply system 10. FIG. 給湯システム１０の沸き上げ運転時の動作を説明するフローチャートである。3 is a flowchart illustrating an operation during a boiling operation of the hot water supply system 10. 給湯システム１０の給湯運転時の動作を説明するフローチャートである。3 is a flowchart for explaining the operation of the hot water supply system 10 during a hot water supply operation.

図１に示すように、本実施例の給湯システム１０は、ヒートポンプ１２と、貯湯槽１４と、混合弁１６と、補助熱源機１８と、コントローラ２０を備えている。   As shown in FIG. 1, the hot water supply system 10 of this embodiment includes a heat pump 12, a hot water storage tank 14, a mixing valve 16, an auxiliary heat source machine 18, and a controller 20.

ヒートポンプ１２は、圧縮機２２と、水熱交換器２４と、膨脹弁２６と、空気熱交換器２８と、送風ファン３０と、循環ポンプ３２と、沸き上げ温度サーミスタ３４と、外気温サーミスタ３８を備えている。ヒートポンプ１２で使用する冷媒は、例えばＲ７４４（ＣＯ２冷媒）であってもよいし、Ｒ４１０Ａ（ＨＦＣ冷媒）であってもよい。圧縮機２２は、吸込側から流入する低温低圧の冷媒を圧縮して、吐出側から送り出す。圧縮機２２の回転数は、通常は定回転数となるように制御される。圧縮機２２の吐出側から送出された冷媒は、水熱交換器２４の冷媒通路２４ａへ供給される。水熱交換器２４では、冷媒通路２４ａを流れる高温の冷媒と、水通路２４ｂを流れる低温の水の間で熱交換する。水熱交換器２４で冷却されて低温となった冷媒は、膨脹弁２６に送られる。膨脹弁２６は、水熱交換器２４から流入する冷媒を断熱膨張させて、空気熱交換器２８へ送る。膨脹弁２６の開度を調整することで、膨脹弁２６における冷媒の膨脹度合が調整される。空気熱交換器２８では、内部を通過する低温の冷媒を外気との熱交換により加熱する。送風ファン３０は空気熱交換器２８の近傍に配置されており、空気熱交換器２８に外気を供給する。送風ファン３０の回転数を調整することで、空気熱交換器２８における冷媒の加熱度合が調整される。空気熱交換器２８から流出する冷媒は、再び圧縮機２２へ送られる。   The heat pump 12 includes a compressor 22, a water heat exchanger 24, an expansion valve 26, an air heat exchanger 28, a blower fan 30, a circulation pump 32, a boiling temperature thermistor 34, and an outside temperature thermistor 38. I have. The refrigerant used in the heat pump 12 may be, for example, R744 (CO2 refrigerant) or R410A (HFC refrigerant). The compressor 22 compresses the low-temperature and low-pressure refrigerant flowing from the suction side and sends it out from the discharge side. The rotational speed of the compressor 22 is normally controlled to be a constant rotational speed. The refrigerant sent from the discharge side of the compressor 22 is supplied to the refrigerant passage 24 a of the water heat exchanger 24. In the water heat exchanger 24, heat is exchanged between the high-temperature refrigerant flowing through the refrigerant passage 24a and the low-temperature water flowing through the water passage 24b. The refrigerant cooled to the low temperature by the water heat exchanger 24 is sent to the expansion valve 26. The expansion valve 26 adiabatically expands the refrigerant flowing from the water heat exchanger 24 and sends it to the air heat exchanger 28. By adjusting the opening degree of the expansion valve 26, the degree of expansion of the refrigerant in the expansion valve 26 is adjusted. In the air heat exchanger 28, the low-temperature refrigerant passing through the inside is heated by heat exchange with the outside air. The blower fan 30 is disposed in the vicinity of the air heat exchanger 28 and supplies outside air to the air heat exchanger 28. By adjusting the rotation speed of the blower fan 30, the heating degree of the refrigerant in the air heat exchanger 28 is adjusted. The refrigerant flowing out from the air heat exchanger 28 is sent to the compressor 22 again.

水熱交換器２４の水通路２４ｂの入口側は、水循環往路４０を介して、貯湯槽１４の底部に連通している。水熱交換器２４の水通路２４ｂの出口側は、水循環復路４２を介して、貯湯槽１４の頂部に連通している。水循環往路４０には、循環ポンプ３２が設けられている。循環ポンプ３２が駆動すると、貯湯槽１４の底部から水が吸い出され、水熱交換器２４の水通路２４ｂに送られる。水熱交換器２４で加熱されて高温となった水は、水循環復路４２を介して貯湯槽１４の頂部に戻される。貯湯槽１４の内部では、低温の水の上方に高温の水が積層される、いわゆる温度成層が形成される。水熱交換器２４を通過して高温となった水の温度は、沸き上げ温度サーミスタ３４により検出される。以下では、沸き上げ温度サーミスタ３４で検出される温度を沸き上げ温度という。   The inlet side of the water passage 24 b of the water heat exchanger 24 communicates with the bottom of the hot water storage tank 14 via the water circulation outward path 40. The outlet side of the water passage 24 b of the water heat exchanger 24 communicates with the top of the hot water storage tank 14 through the water circulation return path 42. A circulation pump 32 is provided in the water circulation outward path 40. When the circulation pump 32 is driven, water is sucked out from the bottom of the hot water tank 14 and sent to the water passage 24 b of the water heat exchanger 24. The water heated to a high temperature by the water heat exchanger 24 is returned to the top of the hot water tank 14 through the water circulation return path 42. Inside the hot water storage tank 14, so-called temperature stratification is formed in which high-temperature water is stacked above low-temperature water. The temperature of the water that has become high temperature after passing through the water heat exchanger 24 is detected by a boiling temperature thermistor 34. Hereinafter, the temperature detected by the boiling temperature thermistor 34 is referred to as the boiling temperature.

貯湯槽１４の底部には、貯湯槽１４に水道水を給水する給水経路４４が接続されている。貯湯槽１４の頂部には、貯湯槽１４から水を送り出す高温水経路４６が接続されている。給水経路４４からは、低温水経路４８が分岐している。高温水経路４６と低温水経路４８は、混合弁１６で合流している。混合弁１６では、高温水経路４６を流れる高温の水と、低温水経路４８を流れる低温の水を混合して、給湯経路５０に送り出す。給湯経路５０には、必要に応じて給湯経路５０を流れる水を加熱する補助熱源機１８が設けられている。補助熱源機１８を通過した水は、給湯栓５２に供給される。給湯栓５２に供給される水の温度は、給湯サーミスタ５４により検出される。   A water supply path 44 for supplying tap water to the hot water tank 14 is connected to the bottom of the hot water tank 14. Connected to the top of the hot water storage tank 14 is a high-temperature water path 46 for sending water from the hot water storage tank 14. A low temperature water path 48 branches off from the water supply path 44. The high-temperature water path 46 and the low-temperature water path 48 merge at the mixing valve 16. In the mixing valve 16, high-temperature water flowing through the high-temperature water path 46 and low-temperature water flowing through the low-temperature water path 48 are mixed and sent out to the hot water supply path 50. The hot water supply path 50 is provided with an auxiliary heat source unit 18 for heating water flowing through the hot water supply path 50 as necessary. The water that has passed through the auxiliary heat source unit 18 is supplied to the hot water tap 52. The temperature of the water supplied to the hot water tap 52 is detected by a hot water thermistor 54.

コントローラ２０は、ヒートポンプ１２、混合弁１６および補助熱源機１８の動作を制御する。コントローラ２０には、給湯設定温度と沸き上げ設定温度が保持されている。   The controller 20 controls operations of the heat pump 12, the mixing valve 16, and the auxiliary heat source unit 18. The controller 20 holds a hot water supply set temperature and a boiling set temperature.

（沸き上げ運転）
沸き上げ運転においては、給湯システム１０は、給湯栓５２への給湯に備えて、貯湯槽１４に高温の水を蓄える。通常は、給湯システム１０は、電気料金の安価な深夜の時間帯において、タイマ制御により沸き上げ運転を実施する。沸き上げ運転を開始すると、コントローラ２０は、圧縮機２２を始動してヒートポンプ１２における冷媒の循環を開始させ、送風ファン３０を始動する。さらに、コントローラ２０は、循環ポンプ３２を始動して貯湯槽１４と水熱交換器２４の間での水の循環を開始させる。これにより、貯湯槽１４の底部から吸い出された水が、水熱交換器２４で加熱されて、貯湯槽１４の頂部へと戻される。沸き上げ運転を行っている間は、沸き上げ温度サーミスタ３４の検出温度が沸き上げ設定温度となるように、膨脹弁２６の開度、送風ファン３０の回転数および循環ポンプ３２の回転数が調整される。なお、沸き上げ運転を行っている間は、圧縮機２２の回転数はほぼ一定に維持される。貯湯槽１４の内部が高温の水で満たされると、給湯システム１０は沸き上げ運転を終了する。 (Boiling operation)
In the boiling operation, the hot water supply system 10 stores hot water in the hot water storage tank 14 in preparation for hot water supply to the hot water tap 52. Normally, the hot water supply system 10 performs a boiling operation by timer control in a midnight time zone where the electricity bill is inexpensive. When the boiling operation is started, the controller 20 starts the compressor 22 to start circulation of the refrigerant in the heat pump 12 and starts the blower fan 30. Furthermore, the controller 20 starts the circulation pump 32 to start the circulation of water between the hot water tank 14 and the water heat exchanger 24. As a result, the water sucked out from the bottom of the hot water tank 14 is heated by the water heat exchanger 24 and returned to the top of the hot water tank 14. During the boiling operation, the opening degree of the expansion valve 26, the rotational speed of the blower fan 30, and the rotational speed of the circulation pump 32 are adjusted so that the detected temperature of the boiling temperature thermistor 34 becomes the set boiling temperature. Is done. During the boiling operation, the rotation speed of the compressor 22 is maintained substantially constant. When the inside of the hot water tank 14 is filled with hot water, the hot water supply system 10 ends the boiling operation.

（給湯運転）
利用者によって給湯栓５２が開かれると、給湯システム１０は給湯運転を開始する。給湯栓５２が開かれると、給水経路４４の給水圧によって貯湯槽１４の内部の水が押し上げられ、貯湯槽１４の頂部から高温水経路４６に高温の水が送出される。高温水経路４６の水は、混合弁１６において低温水経路４８からの低温の水と混合して、給湯経路５０に送出される。コントローラ２０は、給湯サーミスタ５４で検出される温度が給湯設定温度となるように、混合弁１６の開度を調整する。これにより、給湯経路５０を介して給湯栓５２に、給湯設定温度の水が供給される。貯湯槽１４に高温の水が十分に蓄えられていない場合や、後述するように貯湯槽１４からの給湯が禁止されている場合には、混合弁１６から給湯経路５０へ給湯設定温度の水を供給できないことになる。このような場合、コントローラ２０は、補助熱源機１８を駆動して給湯経路５０を流れる水を加熱し、給湯設定温度まで加熱された水を給湯栓５２へ供給する。利用者によって給湯栓５２が閉じられると、給湯システム１０は給湯運転を終了する。 (Hot water operation)
When the hot water tap 52 is opened by the user, the hot water supply system 10 starts a hot water supply operation. When the hot water tap 52 is opened, the water inside the hot water tank 14 is pushed up by the water pressure of the water supply path 44, and high temperature water is sent from the top of the hot water tank 14 to the high temperature water path 46. The water in the high temperature water path 46 is mixed with the low temperature water from the low temperature water path 48 in the mixing valve 16 and sent to the hot water supply path 50. The controller 20 adjusts the opening of the mixing valve 16 so that the temperature detected by the hot water supply thermistor 54 becomes the hot water supply set temperature. Thereby, the hot water supply set temperature water is supplied to the hot water tap 52 through the hot water supply path 50. When hot water is not sufficiently stored in the hot water storage tank 14 or when hot water supply from the hot water storage tank 14 is prohibited as will be described later, water at a hot water supply set temperature is supplied from the mixing valve 16 to the hot water supply path 50. It cannot be supplied. In such a case, the controller 20 drives the auxiliary heat source unit 18 to heat the water flowing through the hot water supply path 50 and supplies the water heated to the hot water supply set temperature to the hot water tap 52. When the hot water tap 52 is closed by the user, the hot water supply system 10 ends the hot water supply operation.

（殺菌運転）
貯湯槽１４の内部に水が長時間滞留すると、レジオネラ菌等の雑菌が繁殖するおそれがある。雑菌が繁殖した水は、そのままでは給湯に使用することができない。そこで、給湯システム１０では、定期的に殺菌運転を行って、貯湯槽１４の内部の水に雑菌が繁殖することを防止する。殺菌運転では、沸き上げ設定温度を水の殺菌温度として、上述した沸き上げ運転と同様の運転を行うことで、貯湯槽の水を殺菌する。水の殺菌温度は、レジオネラ菌等の雑菌を熱により殺菌することができる水温であって、例えば６５℃である。本実施例の給湯システム１０では、直前の殺菌運転の実施から所定時間（例えば８０時間）が経過する毎に、殺菌運転を実施する。なお、殺菌運転を行う際には、混合弁１６において高温水経路４６側の開度を全閉として、貯湯槽１４からの水が給湯経路５０へ流出しないようにする。これにより、殺菌運転のために高温に加熱された水が、不用意に給湯栓５２へ給湯されてしまう事態を防ぐことができる。 (Sterilization operation)
If water stays in the hot water tank 14 for a long time, there is a risk that germs such as Legionella bacteria will propagate. The water in which miscellaneous bacteria propagated cannot be used for hot water supply as it is. Therefore, the hot water supply system 10 periodically performs a sterilization operation to prevent germs from breeding in the water inside the hot water tank 14. In the sterilization operation, the water in the hot water tank is sterilized by performing the same operation as the above-described boiling operation with the boiling set temperature as the water sterilization temperature. The sterilization temperature of water is a water temperature at which miscellaneous bacteria such as Legionella bacteria can be sterilized by heat, and is 65 ° C., for example. In the hot water supply system 10 of the present embodiment, the sterilization operation is performed every time a predetermined time (for example, 80 hours) elapses from the execution of the immediately preceding sterilization operation. When the sterilization operation is performed, the opening degree on the high-temperature water path 46 side in the mixing valve 16 is fully closed so that water from the hot water tank 14 does not flow out to the hot water supply path 50. Accordingly, it is possible to prevent a situation in which water heated to a high temperature for the sterilization operation is inadvertently supplied to the hot water tap 52.

夏場のように、外気温が高い状況でヒートポンプ１２を動作させると、圧縮機２２に流入する冷媒の圧力が上昇し、圧縮機２２における冷媒の圧力および温度の上昇を招いてしまう。さらに、高温の外気に曝されることで、圧縮機２２そのものの温度も上昇する。圧縮機２２を高温・高圧の状態で長時間動作させると、構成部品の劣化を招き、圧縮機２２の耐久性を損なうことになってしまう。   When the heat pump 12 is operated in a situation where the outside air temperature is high as in summer, the pressure of the refrigerant flowing into the compressor 22 increases, leading to an increase in the pressure and temperature of the refrigerant in the compressor 22. Furthermore, the temperature of the compressor 22 itself is increased by being exposed to high temperature outside air. If the compressor 22 is operated for a long time at a high temperature and a high pressure, the components are deteriorated and the durability of the compressor 22 is impaired.

そこで、本実施例の給湯システム１０では、外気温が高い場合には、沸き上げ運転び殺菌運転におけるヒートポンプ１２の動作に制限を加えて、圧縮機２２の耐久性を確保する。   Therefore, in the hot water supply system 10 of the present embodiment, when the outside air temperature is high, the operation of the heat pump 12 in the boiling operation and the sterilization operation is limited to ensure the durability of the compressor 22.

図２は給湯システム１０が沸き上げ運転を開始する際に、コントローラ２０が行う処理を示している。   FIG. 2 shows a process performed by the controller 20 when the hot water supply system 10 starts a boiling operation.

ステップＳ２では、外気温サーミスタ３８によって、外気温の取得を行う。   In step S2, the outside air temperature is obtained by the outside air temperature thermistor 38.

ステップＳ４では、ステップＳ２で取得した外気温が第１所定温度（例えば３８℃）に満たないか否かを判断する。外気温が第１所定温度に満たない場合（ステップＳ４でＹＥＳの場合）、沸き上げ設定温度および圧縮機２２の回転数を特に変更することなく、ステップＳ６に進み、沸き上げ運転を実施する。ステップＳ４で外気温が第１所定温度以上である場合（ＮＯの場合）、ステップＳ８へ進む。ステップＳ８では、沸き上げ設定温度を所定温度幅（例えば１０℃）上昇させる。このように、沸き上げ設定温度を上昇させることによって、圧縮機２２に流入する冷媒の圧力上昇を防ぎ、圧縮機２２が高温・高圧で動作する事態を抑制することができる。ステップＳ８の後、処理はステップＳ１０へ進む。   In step S4, it is determined whether or not the outside air temperature acquired in step S2 is less than a first predetermined temperature (for example, 38 ° C.). If the outside air temperature is less than the first predetermined temperature (YES in step S4), the process proceeds to step S6 without particularly changing the boiling set temperature and the rotation speed of the compressor 22, and the boiling operation is performed. If the outside air temperature is equal to or higher than the first predetermined temperature in step S4 (NO), the process proceeds to step S8. In step S8, the boiling set temperature is increased by a predetermined temperature range (for example, 10 ° C.). In this way, by raising the boiling set temperature, it is possible to prevent an increase in the pressure of the refrigerant flowing into the compressor 22 and to suppress a situation where the compressor 22 operates at a high temperature and a high pressure. After step S8, the process proceeds to step S10.

ステップＳ１０では、外気温が第２所定温度（例えば４０℃）に満たないか否かを判断する。外気温が第２所定温度に満たない場合（ＹＥＳの場合）、ステップＳ６へ進んで、沸き上げ運転を実施する。ステップＳ１０で外気温が第２所定温度以上である場合（ＮＯの場合）、ステップＳ１２へ進む。   In step S10, it is determined whether or not the outside air temperature is less than a second predetermined temperature (for example, 40 ° C.). When the outside air temperature is less than the second predetermined temperature (in the case of YES), the process proceeds to step S6 and the boiling operation is performed. When the outside air temperature is equal to or higher than the second predetermined temperature in step S10 (in the case of NO), the process proceeds to step S12.

ステップＳ１２では、外気温が第３所定温度（例えば４５℃）に満たないか否かを判断する。外気温が第３所定温度に満たない場合（ＹＥＳの場合）、ステップＳ１４へ進む。ステップＳ１４では、圧縮機２２の回転数を、通常よりも所定量（例えば５００ｒｐｍ）減少させる。圧縮機２２の回転数を通常よりも減少させることによって、圧縮機２２に流入する冷媒の圧力上昇を防ぎ、圧縮機２２が高温・高圧で動作する事態を抑制することができる。ステップＳ１４の後、ステップＳ６へ進み、沸き上げ運転を実施する。ステップＳ１２で外気温が第３所定温度以上である場合（ＮＯの場合）、ステップＳ１６へ進む。   In step S12, it is determined whether or not the outside air temperature is less than a third predetermined temperature (for example, 45 ° C.). When the outside air temperature is less than the third predetermined temperature (in the case of YES), the process proceeds to step S14. In step S14, the number of rotations of the compressor 22 is decreased by a predetermined amount (for example, 500 rpm) than usual. By reducing the number of rotations of the compressor 22 from normal, it is possible to prevent an increase in the pressure of the refrigerant flowing into the compressor 22 and to prevent the compressor 22 from operating at a high temperature and a high pressure. It progresses to step S6 after step S14, and a boiling operation is implemented. If the outside air temperature is equal to or higher than the third predetermined temperature in step S12 (NO), the process proceeds to step S16.

ステップＳ１６では、外気温が第４所定温度（例えば５０℃）に満たないか否かを判断する。外気温が第４所定温度に満たない場合（ＹＥＳの場合）、ステップＳ１８へ進む。ステップＳ１８では、圧縮機２２の回転数を、通常よりも所定量（例えば１０００ｒｐｍ）減少させる。圧縮機２２の回転数を通常よりも減少させることによって、圧縮機２２に流入する冷媒の圧力上昇を防ぎ、圧縮機２２が高温・高圧で動作する事態を抑制することができる。ステップＳ１８の後、ステップＳ６へ進み、沸き上げ運転を実施する。ステップＳ１６で外気温が第４所定温度以上である場合（ＮＯの場合）、ステップＳ２０へ進む。ステップＳ２０では、沸き上げ運転を禁止して処理を終了する。これによって、圧縮機２２が高温・高圧で動作する機会を低減して、圧縮機２２の耐久性を確保することができる。   In step S16, it is determined whether or not the outside air temperature is less than a fourth predetermined temperature (for example, 50 ° C.). When the outside air temperature is less than the fourth predetermined temperature (in the case of YES), the process proceeds to step S18. In step S18, the rotation speed of the compressor 22 is decreased by a predetermined amount (for example, 1000 rpm) from the normal value. By reducing the number of rotations of the compressor 22 from normal, it is possible to prevent an increase in the pressure of the refrigerant flowing into the compressor 22 and to prevent the compressor 22 from operating at a high temperature and a high pressure. It progresses to step S6 after step S18, and a boiling operation is implemented. If the outside air temperature is equal to or higher than the fourth predetermined temperature in step S16 (in the case of NO), the process proceeds to step S20. In step S20, the boiling operation is prohibited and the process is terminated. Thereby, the opportunity for the compressor 22 to operate at high temperature and high pressure can be reduced, and the durability of the compressor 22 can be ensured.

次に、殺菌運転におけるヒートポンプ１２の動作制限について説明する。本実施例の給湯システム１０では、外気温サーミスタ３８で検出される外気温が所定温度（例えば４０℃）以上である場合には、殺菌運転を禁止する。これによって、圧縮機２２が高温・高圧のもとで動作する機会を低減することができる。圧縮機２２の耐久性を確保することができる。   Next, operation restrictions of the heat pump 12 in the sterilization operation will be described. In the hot water supply system 10 of the present embodiment, the sterilization operation is prohibited when the outside air temperature detected by the outside air temperature thermistor 38 is equal to or higher than a predetermined temperature (for example, 40 ° C.). Thereby, the opportunity for the compressor 22 to operate under high temperature and high pressure can be reduced. The durability of the compressor 22 can be ensured.

上記のように殺菌運転を禁止することで、殺菌運転が実施されずに長期間が経過すると、貯湯槽１４の内部の水に雑菌が繁殖するおそれがある。雑菌が繁殖した水は、給湯栓５２へ給湯することができない。そこで、本実施例の給湯システム１０では、給湯運転において貯湯槽１４からの給湯に制限を加える。   By prohibiting the sterilization operation as described above, if the sterilization operation is not performed and a long period of time elapses, there is a possibility that various germs may propagate in the water inside the hot water tank 14. The water in which various germs have propagated cannot be supplied to the hot water tap 52. Therefore, in the hot water supply system 10 of the present embodiment, the hot water supply from the hot water storage tank 14 is limited in the hot water supply operation.

図３は給湯システム１０が給湯運転を開始する際に、コントローラ２０が行う処理を示している。   FIG. 3 shows processing performed by the controller 20 when the hot water supply system 10 starts a hot water supply operation.

ステップＳ３２では、直前の殺菌運転の実施時刻を特定し、その時刻から現在までの経過時間（以下では第１経過時間という）を取得する。   In step S32, the execution time of the immediately preceding sterilization operation is specified, and the elapsed time from that time to the present (hereinafter referred to as the first elapsed time) is acquired.

ステップＳ３４では、ステップＳ３２で取得した第１経過時間が、第１所定時間（例えば８０時間）以上であるか否かを判断する。第１経過時間が第１所定時間に満たない場合（ＮＯの場合）、ステップＳ４２へ進んで、通常通りの給湯運転を行う。この場合には、直前の殺菌運転からそれほど長時間が経過しておらず、貯湯槽１４の内部の水が清浄に保たれているので、貯湯槽１４から給湯を行っても問題はない。ステップＳ３４で、第１経過時間が第１所定時間を越える場合（ＹＥＳの場合）、ステップＳ３６へ進む。   In step S34, it is determined whether or not the first elapsed time acquired in step S32 is equal to or longer than a first predetermined time (for example, 80 hours). When the first elapsed time is less than the first predetermined time (in the case of NO), the process proceeds to step S42 to perform a normal hot water supply operation. In this case, since a long time has not passed since the last sterilization operation and the water in the hot water tank 14 is kept clean, there is no problem even if hot water is supplied from the hot water tank 14. In step S34, when the first elapsed time exceeds the first predetermined time (in the case of YES), the process proceeds to step S36.

ステップＳ３６では、直前の貯湯槽１４からの給湯時刻を特定し、その時刻から現在までの経過時間（以下では第２経過時間）を取得する。   In step S36, the hot water supply time from the immediately preceding hot water tank 14 is specified, and the elapsed time from that time to the present (hereinafter, second elapsed time) is acquired.

ステップＳ３８では、ステップＳ３６で取得した第２経過時間が、第２所定時間（例えば２０時間）以上であるか否かを判断する。第２経過時間が第２所定時間以上である場合（ＹＥＳの場合）、ステップＳ４０へ進む。   In step S38, it is determined whether or not the second elapsed time acquired in step S36 is equal to or longer than a second predetermined time (for example, 20 hours). When the second elapsed time is equal to or longer than the second predetermined time (in the case of YES), the process proceeds to step S40.

ステップＳ４０では、貯湯槽１４からの給湯を禁止した状態で、給湯栓５２への給湯を行う。具体的には、混合弁１６を制御して、貯湯槽１４から高温水経路４６を介して給湯経路５０へ供給される水の流量をゼロとした状態で、給水経路４４から低温水経路４８を経て給湯経路５０に供給される低温の水を、補助熱源機１８により加熱して、給湯栓５２への給湯を行う。ステップＳ４０を実行するのは、直前の殺菌運転から第１所定時間（例えば８０時間）が経過しており、かつ直前の貯湯槽１４からの給湯から第２所定時間（例えば２０時間）が経過している場合である。このような場合には、貯湯槽１４の内部の水に雑菌が繁殖しているおそれがある。そこで、本実施例の給湯システム１０では、このような場合に、貯湯槽１４からの給湯を禁止し、利用者の安全性を確保している。いったん貯湯槽１４からの給湯が禁止されると、外気温が低下して殺菌運転が行われるまで、貯湯槽１４からの給湯が行われることがない。外気温が低下して殺菌運転が行われた後は、再び貯湯槽１４からの給湯を行うことが可能となる。   In step S40, hot water is supplied to the hot water tap 52 in a state where hot water supply from the hot water storage tank 14 is prohibited. Specifically, the mixing valve 16 is controlled so that the flow rate of water supplied from the hot water storage tank 14 to the hot water supply path 50 via the high temperature water path 46 is zero, and the low temperature water path 48 is changed from the water supply path 44. Then, the low temperature water supplied to the hot water supply path 50 is heated by the auxiliary heat source unit 18 to supply hot water to the hot water tap 52. Step S40 is executed because a first predetermined time (for example, 80 hours) has elapsed since the immediately preceding sterilization operation, and a second predetermined time (for example, 20 hours) has elapsed since the hot water supply from the immediately preceding hot water storage tank 14 is performed. It is a case. In such a case, there is a possibility that various germs are propagated in the water inside the hot water tank 14. Therefore, in such a case, the hot water supply system 10 of the present embodiment prohibits hot water supply from the hot water storage tank 14 to ensure the safety of the user. Once hot water supply from the hot water storage tank 14 is prohibited, hot water supply from the hot water storage tank 14 is not performed until the outside air temperature decreases and the sterilization operation is performed. After the outside air temperature is lowered and the sterilization operation is performed, the hot water supply from the hot water storage tank 14 can be performed again.

ステップＳ３８で、経過時間が第２所定時間を越えていない場合（ＮＯの場合）には、ステップＳ４２へ進んで、通常通りの給湯運転がなされる。この場合には、直前の殺菌運転から長時間が経過しているものの、直前の貯湯槽１４からの給湯により貯湯槽１４の内部の水の入れ換えがなされているので、貯湯槽１４の内部の水に雑菌が繁殖しているおそれはほとんどない。そこで、本実施例の給湯システム１０では、このような場合に、貯湯槽１４からの給湯を許可し、利用者の利便性を確保している。   In step S38, when the elapsed time does not exceed the second predetermined time (in the case of NO), the process proceeds to step S42, and the normal hot water supply operation is performed. In this case, although a long time has passed since the immediately preceding sterilization operation, the water inside the hot water tank 14 has been replaced by the hot water supply from the immediately preceding hot water tank 14, so the water inside the hot water tank 14 has been replaced. There is almost no risk of germs breeding. Therefore, in such a case, the hot water supply system 10 of the present embodiment permits hot water supply from the hot water storage tank 14 to ensure the convenience for the user.

以上、本発明の具体例を詳細に説明したが、これらは例示にすぎず、特許請求の範囲を限定するものではない。特許請求の範囲に記載の技術には、以上に例示した具体例を様々に変形、変更したものが含まれる。また、本明細書または図面に説明した技術要素は、単独であるいは各種の組合せによって技術的有用性を発揮するものであり、出願時の請求項記載の組合せに限定されるものではない。また、本明細書または図面に例示した技術は、複数目的を同時に達成するものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。   Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

１０ 給湯システム
１２ ヒートポンプ
１４ 貯湯槽
１６ 混合弁
１８ 補助熱源機
２０ コントローラ
２２ 圧縮機
２４ 水熱交換器
２４ａ 冷媒通路
２４ｂ 水通路
２６ 膨脹弁
２８ 空気熱交換器
３０ 送風ファン
３２ 循環ポンプ
３４ 沸き上げ温度サーミスタ
３８ 外気温サーミスタ
４０ 水循環往路
４２ 水循環復路
４４ 給水経路
４６ 高温水経路
４８ 低温水経路
５０ 給湯経路
５２ 給湯栓
５４ 給湯サーミスタ DESCRIPTION OF SYMBOLS 10 Hot water supply system 12 Heat pump 14 Hot water storage tank 16 Mixing valve 18 Auxiliary heat source machine 20 Controller 22 Compressor 24 Water heat exchanger 24a Refrigerant passage 24b Water passage 26 Expansion valve 28 Air heat exchanger 30 Blower fan 32 Circulation pump 34 Boiling temperature thermistor 38 Outdoor temperature thermistor 40 Water circulation outbound path 42 Water circulation return path 44 Water supply path 46 High temperature water path 48 Low temperature water path 50 Hot water supply path 52 Hot water tap 54 Hot water supply thermistor

Claims (4)

冷媒を圧縮する圧縮機と、
冷媒と水との間で熱交換する水熱交換器と、
冷媒を膨脹させる膨脹弁と、
冷媒と空気との間で熱交換する空気熱交換器と、
冷媒を圧縮機、水熱交換器、膨脹弁、空気熱交換器の順に循環させる冷媒循環経路と、
空気熱交換器に外気を供給する送風ファンと、
水熱交換器に水を供給するポンプと、
水熱交換器を通過した水の温度を沸き上げ温度として検出する沸き上げ温度検出手段を備えており、
沸き上げ温度が沸き上げ設定温度となるように、膨脹弁の開度と、送風ファンの回転数と、ポンプの回転数を調整するヒートポンプ給湯器であって、
外気温を検出する外気温検出手段をさらに備えており、
外気温が第１所定温度を超える場合に、沸き上げ設定温度を上昇させ、
外気温が第２所定温度を超える場合に、圧縮機の回転数を低減させることを特徴とするヒートポンプ給湯器。 A compressor for compressing the refrigerant;
A water heat exchanger for exchanging heat between the refrigerant and water;
An expansion valve for inflating the refrigerant;
An air heat exchanger for exchanging heat between the refrigerant and the air;
A refrigerant circulation path for circulating the refrigerant in the order of a compressor, a water heat exchanger, an expansion valve, and an air heat exchanger;
A blower fan for supplying outside air to the air heat exchanger;
A pump for supplying water to the water heat exchanger;
It has boiling temperature detection means that detects the temperature of water that has passed through the water heat exchanger as the boiling temperature,
A heat pump water heater that adjusts the opening degree of the expansion valve, the rotation speed of the blower fan, and the rotation speed of the pump so that the boiling temperature becomes the set boiling temperature,
It further comprises an outside air temperature detecting means for detecting the outside air temperature,
When the outside air temperature exceeds the first predetermined temperature, raise the boiling set temperature,
A heat pump water heater that reduces the rotational speed of the compressor when the outside air temperature exceeds a second predetermined temperature. 冷媒を圧縮する圧縮機と、
冷媒と水との間で熱交換する水熱交換器と、
冷媒を膨脹させる膨脹弁と、
冷媒と空気との間で熱交換する空気熱交換器と、
冷媒を圧縮機、水熱交換器、膨脹弁、空気熱交換器の順に循環させる冷媒循環経路と、
空気熱交換器に外気を供給する送風ファンと、
底部から水を水熱交換器へ送り出し、水熱交換器を通過した水を頂部から受け入れる貯湯槽と、
水熱交換器と貯湯槽の間で水を循環させる循環ポンプと、
水熱交換器を通過した水の温度を沸き上げ温度として検出する沸き上げ温度検出手段を備えており、
沸き上げ温度が沸き上げ設定温度となるように、膨脹弁の開度と、送風ファンの回転数と、ポンプの回転数を調整するヒートポンプ給湯器であって、
沸き上げ設定温度を水の殺菌温度として、貯湯槽の水を殺菌する殺菌運転を実施可能に構成されており、
外気温を検出する外気温検出手段をさらに備えており、
外気温が所定温度を超える場合に、殺菌運転を禁止することを特徴とするヒートポンプ給湯器。 A compressor for compressing the refrigerant;
A water heat exchanger for exchanging heat between the refrigerant and water;
An expansion valve for inflating the refrigerant;
An air heat exchanger for exchanging heat between the refrigerant and the air;
A refrigerant circulation path for circulating the refrigerant in the order of a compressor, a water heat exchanger, an expansion valve, and an air heat exchanger;
A blower fan for supplying outside air to the air heat exchanger;
A hot water tank for sending water from the bottom to the water heat exchanger and receiving the water that has passed through the water heat exchanger from the top;
A circulation pump for circulating water between the water heat exchanger and the hot water tank,
It has boiling temperature detection means that detects the temperature of water that has passed through the water heat exchanger as the boiling temperature,
A heat pump water heater that adjusts the opening degree of the expansion valve, the rotation speed of the blower fan, and the rotation speed of the pump so that the boiling temperature becomes the set boiling temperature,
It is configured to enable sterilization operation to sterilize the water in the hot water tank with the boiling set temperature as the water sterilization temperature,
It further comprises an outside air temperature detecting means for detecting the outside air temperature,
A heat pump water heater, wherein sterilization operation is prohibited when the outside air temperature exceeds a predetermined temperature. 直前の殺菌運転の実施から第１所定時間が経過した場合に、次の殺菌運転が実施されるまで、貯湯槽からの給湯を禁止することを特徴とする請求項２の給湯器。   3. The water heater according to claim 2, wherein when a first predetermined time has elapsed since the execution of the immediately preceding sterilization operation, hot water supply from the hot water storage tank is prohibited until the next sterilization operation is performed. 直前の殺菌運転の実施から第１所定時間が経過しており、かつ次の殺菌運転が実施される前であっても、直前の貯湯槽からの給湯から第２所定時間が経過していなければ、貯湯槽からの給湯を許可することを特徴とする請求項３の給湯器。   The first predetermined time has elapsed since the execution of the immediately preceding sterilization operation, and the second predetermined time has not elapsed since the hot water supply from the immediately preceding hot water tank even before the next sterilization operation is performed. The hot water heater according to claim 3, wherein hot water supply from a hot water tank is permitted.
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