HEAT PUMP DEFROSTING CIRCUIT, HEAT PUMP WATER HEATER, AND DEFROSTING METHOD FOR HEAT PUMP WATER HEATER

PROBLEM TO BE SOLVED: To implement an efficient and short defrosting operation by opening and closing a defrosting valve appropriately during the defrosting operation. SOLUTION: A heat pump defrosting circuit connects a compressor 2, a gas cooler 3, an expansion valve 6 and an evaporator 7 in series...

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Bibliographic Details
Main Authors HARA MASAHIRO, OGATA MASAMI
Format Patent
LanguageEnglish
Published 21.02.2008
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 implement an efficient and short defrosting operation by opening and closing a defrosting valve appropriately during the defrosting operation. SOLUTION: A heat pump defrosting circuit connects a compressor 2, a gas cooler 3, an expansion valve 6 and an evaporator 7 in series with refrigerant piping 10 and 11, and connects a refrigerant piping point between the compressor and the gas cooler and a refrigerant piping point between the expansion valve and the evaporator with defrosting piping 23 having the defrosting valve 22. In a defrosting operation, the opening/closing of the defrosting valve is controlled in accordance with the discharge pressure and discharge refrigerant temperature of the compressor without an operation stop of the compressor. COPYRIGHT: (C)2008,JPO&INPIT
Bibliography:Application Number: JP20060217128