Heat pump system with hot water defrost
Patent
·
OSTI ID:6622707
This patent describes an integrated heat pump and hot water system that includes, a heat pump having an indoor heat exchanger unit and an outdoor heat exchanger unit that are selectively connected to a compressor inlet and a compressor outlet by a flow reversing means and to each other by a flow reversing means and to each other by a refrigerant liquid line containing a bi-flow expansion valve for metering refrigerant moving in either direction through the liquid line, and bi-flow expansion valve having a positive shut off means to prevent refrigerant from flowing therethrough, a refrigerant to water heat exchanger having a water flow circuit that is in heat transfer relation with a first refrigerant condensing circuit and a second refrigerant evaporating circuit. The refrigerant condensing circuit is connected into a discharge line connecting the outlet of the compressor to the reversing means whereby all the refrigerant discharged by the compressor passes through the condensing circuit. The refrigerant evaporating circuit is connected at one end to the inlet of the compressor and at the other end to an evaporator line that is operatively joined to the liquid line at a point between the bi-flow expansion valve and the outdoor heat exchanger, a metering valve in the evaporator line that is selectively movable between a first closed position whereby refrigerant is prevented from moving through the evaporator line and an open position whereby refrigerant is throttled from the liquid line into the evaporator circuit.
- Assignee:
- Electric Power Research Institute, Inc., Palo Alto, CA
- Patent Number(s):
- US 4766734
- OSTI ID:
- 6622707
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320106* -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
COMPRESSORS
CONDENSERS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DEFROSTING
DESIGN
EQUIPMENT
EVAPORATORS
FLOW REGULATORS
FLUIDS
HEAT EXCHANGERS
HEAT PUMPS
HOT WATER
HYDROGEN COMPOUNDS
METERING
OXYGEN COMPOUNDS
REFRIGERANTS
VALVES
WATER
WORKING FLUIDS
320106* -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
COMPRESSORS
CONDENSERS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DEFROSTING
DESIGN
EQUIPMENT
EVAPORATORS
FLOW REGULATORS
FLUIDS
HEAT EXCHANGERS
HEAT PUMPS
HOT WATER
HYDROGEN COMPOUNDS
METERING
OXYGEN COMPOUNDS
REFRIGERANTS
VALVES
WATER
WORKING FLUIDS