Heat pump using solar and outdoor air heat sources

Details Heat pump using solar and outdoor air heat sources Heat pump using solar and outdoor air heat sources

1981-04-10

1982-12-14

Wayner, William E.

Refrigeration

Processes

Exchanging heat between plural systems, e.g., disparate

622386, 622351, 237 2B, G05D 2300, F25B 2702

Patent

active

043632181

ABSTRACT:
A heat pump system uses a non-reversing refrigeration circuit having a water-cooled condenser and a counterflow chiller fed by a thermostatic expansion valve to permit operation at close to zero superheat. To protect the compressor in the refrigeration circuit from possible flood-back at this low superheat, a combination suction-liquid heat exchanger-suction accumulator is employed. A hold-back valve serves to maintain constant compressor suction pressure regardless of evaporator pressure fluctuations caused by changing chiller fluid temperatures. The system is designed to operate in four distinct modes: (1) water source heat pump heating; (2) direct solar heating; (3) air source heat pump heating; and (4) heat pump cooling. To switch the refrigeration circuit to heat pump mode from the cooling mode or vice versa, four three-way valves and three fluid pumps are selectively operated. The fluid circuit of the system consists of two separate coils in an air-handling unit. One coil is connected to the solar collector circuit and may be used for either heating or cooling. A second coil is connected to the condenser circuit and works during the heat pump cycle.

REFERENCES:
patent: 3996759 (1976-12-01), Meckler
patent: 4091636 (1978-05-01), Margen
patent: 4111259 (1978-09-01), Lebduska
patent: 4165036 (1979-08-01), Meckler
patent: 4187687 (1980-02-01), Savage

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