Refrigeration – Reversible – i.e. – heat pump – With flow control or compressor details
Patent
1987-12-23
1989-07-04
Tanner, Harry B.
Refrigeration
Reversible, i.e., heat pump
With flow control or compressor details
62155, 62218, F25B 1300
Patent
active
048438383
ABSTRACT:
An air-to-air heat pump with improved efficiency of operation, and simplicity and economy of construction. Initiation and termination of defrost cycles during heating mode operation is controlled, in addition to the conventional clock timer, by a dual pressure switch responsive to pressure in the outdoor coil, thereby significantly reducing the length of defrost cycles with corresponding improvement in operating efficiency. The direction of refrigerant flow between the indoor and outdoor coils is established in a first line through the compressor by an electrically operated reversing valve, and alternatively through second and third lines, depending upon whether the system is operating in the heating or cooling mode, by series-connected check and float valves in each of such lines. When heating mode operation is resumed following a defrost cycle, the float valve has delivered all liquid-refrigerant to the indoor coil. Since there is no liquid refrigerant in the outdoor coil to be drawn into the compressor under these conditions, the usual trap type accumulator is not required and is therefore eliminated in the present system.
REFERENCES:
patent: 2051802 (1936-08-01), Philipp
patent: 3170304 (1965-02-01), Hale
patent: 3273635 (1966-09-01), Jobes
McGuire Charles S.
Tanner Harry B.
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