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Title: Heat pump with freeze-up prevention

What is disclosed is a heat pump apparatus for conditioning a fluid characterized by a fluid handler and path for circulating the fluid in heat exchange relationship with a refrigerant fluid; at least two refrigerant heat exchangers, one for effecting heat exchange with the fluid and a second for effecting heat exchange between refrigerant and a heat exchange fluid and the ambient air; a compressor for efficiently compressing the refrigerant; at least one throttling valve for throttling liquid refrigerant; a refrigerant circuit; refrigerant; a source of heat exchange fluid; heat exchange fluid circulating device and heat exchange fluid circuit for circulating the heat exchange fluid in heat exchange relationship with the refrigerant; and valves or switches for selecting the heat exchangers and direction of flow of the refrigerant therethrough for selecting a particular mode of operation. The heat exchange fluid prevents freeze up of the second heat exchanger by keeping the temperature above the dew point; and, optionally, provides heat for efficient operation.
Authors:
 [1]
  1. (Dallas, TX)
Publication Date:
OSTI Identifier:
864084
Report Number(s):
US 4308042
DOE Contract Number:
AC03-78CS31718
Resource Type:
Patent
Research Org:
NORTHRUP INDUSTRIES
Country of Publication:
United States
Language:
English
Subject:
heat; pump; freeze-up; prevention; disclosed; heat; pump; apparatus; conditioning; fluid; characterized; fluid; handler; path; circulating; fluid; heat; exchange; relationship; refrigerant; fluid; refrigerant; heat; exchangers; effecting; heat; exchange; fluid; effecting; heat; exchange; refrigerant; heat; exchange; fluid; ambient; air; compressor; efficiently; compressing; refrigerant; throttling; valve; throttling; liquid; refrigerant; refrigerant; circuit; refrigerant; source; heat; exchange; fluid; heat; exchange; fluid; circulating; device; heat; exchange; fluid; circuit; circulating; heat; exchange; fluid; heat; exchange; relationship; refrigerant; valves; switches; selecting; heat; exchangers; direction; flow; refrigerant; therethrough; selecting; particular; mode; operation; heat; exchange; fluid; prevents; freeze; heat; exchanger; keeping; temperature; dew; optionally; provides; heat; efficient; operation; effecting heat; effecting heat; refrigerant circuit; pump apparatus; ambient air; heat pump; heat pump; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchanger; heat exchanger; heat exchanger; heat exchangers; heat exchangers; exchange relationship; exchange relationship; liquid refrigerant; exchange fluid; exchange fluid; exchange fluid; exchange fluid; exchange fluid; exchange fluid; refrigerant fluid; exchange relation; exchange relation; fluid circuit; refrigerant therethrough; provides heat; particular mode; circulating device; refrigerant heat; throttling valve; fluid handler; fluid characterized; fluid circulating; efficient operation /62/126/165/