Heat pump system with hot water defrost

Patent · Tue Aug 30 00:00:00 EDT 1988

OSTI ID:6622707

Dudley, K F

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
• Resource Relation: Patent File Date: Filed date 8 Sep 1987
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
HEAT PUMPS
DESIGN
COMPRESSORS
CONDENSERS
CONTROL SYSTEMS
DEFROSTING
EVAPORATORS
HEAT EXCHANGERS
HOT WATER
METERING
REFRIGERANTS
VALVES
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUIDS
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
WATER
WORKING FLUIDS
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)