Refrigeration – Automatic control – Selective heating or cooling
Patent
1983-10-17
1985-01-15
King, Lloyd L.
Refrigeration
Automatic control
Selective heating or cooling
622351, 622386, 622387, 625241, 623244, F25B 1300
Patent
active
044931930
ABSTRACT:
A reversible mode heating and cooling system comprises a conventional reversible heat pump unit having a compressor, a reversible valve, an indoor heat exchanger in heat exchange relationship with indoor ambient air, refrigerant expansion means and an outdoor heat exchanger in heat exchange relationship with outdoor ambient air, and operatively associated therewith, an auxiliary heat exchanger in heat exchange relationship with a heat exchange fluid for enhancing the capacity and efficiency of the system to evaporate refrigerant during the heating mode and to condense refrigerant during the cooling mode. The auxiliary heat exchanger is arranged for selective parallel or simultaneous parallel and series flow of refrigerant through the auxiliary heat exchanger and the outdoor heat exchanger to enhance the heating efficiency of the system at very low outdoor ambient temperatures. A temperature and/or pressure sensing and flow control subsystem is operatively associated with the heating and cooling system to sense system or ambient parameters and to operate fluid flow control valves to most efficiently and effectively direct refrigerant flow to the outdoor and/or auxiliary heat exchangers. A frost preventative or defrost system for the auxiliary heat exchange coil is provided which includes a reclamation heat exchanger in the compressor discharge line for transferring heat from the refrigerant to the heat exchange fluid enroute to the auxiliary coil.
REFERENCES:
patent: 3563304 (1971-02-01), McGrath
patent: 3918268 (1975-11-01), Nussbaum
patent: 4165037 (1979-08-01), McCarson
patent: 4173865 (1979-11-01), Sawyer
patent: 4191023 (1980-03-01), Sisk et al.
patent: 4256475 (1981-03-01), Schafer
patent: 4257239 (1981-03-01), Partin et al.
patent: 4270518 (1981-06-01), Bourne
Duberg John E.
King Lloyd L.
Lake, Jr. Rutherford C.
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