HEAT PUMP WATER HEATER

PROBLEM TO BE SOLVED: To provide, for example, a heat pump water heater capable of easily and surely achieving reduction in defrosting operation time, and to provide a heat pump water heater capable of preventing fluid return to a compressor during a defrosting operation.SOLUTION: A heat pump water...

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Bibliographic Details
Main Author INAMOTO TATSUMI
Format Patent
LanguageEnglish
Japanese
Published 17.11.2014
Subjects
BLASTING
COMBINED HEATING AND REFRIGERATION SYSTEMS
FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEATGENERATING MEANS, IN GENERAL
HEAT PUMP SYSTEMS
HEATING
LIGHTING
LIQUEFACTION SOLIDIFICATION OF GASES
MANUFACTURE OR STORAGE OF ICE
MECHANICAL ENGINEERING
RANGES
REFRIGERATION MACHINES, PLANTS OR SYSTEMS
REFRIGERATION OR COOLING
VENTILATING
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide, for example, a heat pump water heater capable of easily and surely achieving reduction in defrosting operation time, and to provide a heat pump water heater capable of preventing fluid return to a compressor during a defrosting operation.SOLUTION: A heat pump water heater 1 comprises: a heat pump unit 20 in which a compressor 21, a hot water supply heat exchanger 22, an expansion valve 23, and an outdoor heat absorption heat exchanger 24 are connected by a refrigerant circuit 25; a bypass circuit 31 provided in the refrigerant circuit 25 and bypassing the expansion valve 23; and a defrosting solenoid valve 32 provided in this bypass circuit 31. The heat pump water heater 1 further comprises defrosting operation control means stopping heat exchange in the hot water supply heat exchanger 22 and starting a defrosting operation when frosting of the outdoor heat absorption heat exchanger 24 is detected. The defrosting operation control means controls the defrosting solenoid valve 32 to be opened/closed either according to a discharge refrigerant temperature of the compressor 21 or at regular intervals during the defrosting operation. 【課題】除霜運転時間の短縮化を容易に且つ確実に実現可能なヒートポンプ給湯装置を提供すること、除霜運転時に圧縮機への液戻りを防止可能なヒートポンプ給湯装置を提供すること、等である。【解決手段】ヒートポンプ給湯装置１は、圧縮機２１と給湯用熱交換器２２と膨張弁２３と外気熱吸収用熱交換器２４とを冷媒回路２５で接続したヒートポンプユニット２０と、冷媒回路２５に設けられ且つ膨張弁２３をバイパスするバイパス回路３１と、このバイパス回路３１に設けられた除霜用電磁弁３２とを備え、さらに、外気熱吸収用熱交換器２４の着霜を検知した場合には、給湯用熱交換器２２での熱交換を停止すると共に除霜運転を開始する除霜運転制御手段を備え、除霜運転制御手段は、除霜運転中には、圧縮機２１の吐出冷媒温度に応じて又は周期的に除霜用電磁弁３２を開閉制御する。【選択図】図２
Bibliography:Application Number: JP20130093314