Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1981-01-27
1984-03-27
Makay, Albert J.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
622386, 622351, G05D 2300, F25B 2702
Patent
active
044388810
ABSTRACT:
A solar assisted heat pump fluid heating system capable of reliable operation at higher than normal ambient temperatures is disclosed. The system includes a collection of solar panels and primary fluid storage tanks having integral coiled heat exchangers interconnected and charged with heat transfer fluid to produce heat. Temperature sensors positioned at the panels and storage tanks transmit temperature signals to solar control circuit. At predetermined temperatures, the solar control circuit energizes a first circulation pump transferring heated fluid from the panels, effecting heat transfer with a low temperature working fluid stored in the tanks. A second circulation pump transfers stored working fluid to a heat exchanger, effecting heat transfer. A heat pump generating a hot refrigerant fluid provides additional heat input when entering working fluid to the heat exchanger is below a predetermined temperature. The heat pump includes an evaporator, compressor and accumulator interconnected in refrigerant flow relationship to provide the hot gas to the heat exchanger. A motor driven evaporator fan circulates ambient air through the evaporator to heat the refrigerant fluid. The heated fluid is then compressed into a superheated refrigerant gas. A modulating control circuit detects fluid temperature of refrigerant leaving the evaporator and controls the fan speed to maintain the fluid within a predetermined temperature range. By restricting ambient air flow through the evaporator, heat pump operation at higher than normal ambient temperatures is possible. Alternatively, damper vanes positioned adjacent openings exposing the evaporator to ambient air are operated by a modulating motor, energized by the modulating control circuit to further restrict air flow and control refrigerant fluid temperature. Heated working fluid leaving the heat exchanger is stored in secondary storage tanks. A third circulation pump with thermostatic control circuit mixes fluid in the primary and secondary tanks, to obtain better fluid heating when temperatures at the solar collecting panel are below a predetermined temperature.
REFERENCES:
patent: 3449922 (1969-06-01), Ruff et al.
patent: 4190199 (1980-02-01), Gawley et al.
patent: 4254636 (1981-03-01), Zebuhr
patent: 4299098 (1981-11-01), Derosier
patent: 4330309 (1982-05-01), Robinson, Jr.
Bennett Henry
Makay Albert J.
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