Heat pump with single exterior temperature sensor

Details Heat pump with single exterior temperature sensor Heat pump with single exterior temperature sensor

1988-10-12

1990-03-27

Tanner, Harry B.

Refrigeration

With indicator or tester

Condition sensing

62156, 62180, 364557, F25D 1700

Patent

active

049109669

ABSTRACT:
The present invention is a method and apparatus for determining the exterior ambient temperature in a heat pump. In accordance with the prior art the heat pump defrosts the exterior heat exchanger if the exterior heat exchanger temperature has a predetermined relationship to the exterior ambient temperature. The exterior heat exchanger temperature is measured directly via a temperature sensor. The improvement of the present invention includes operating the exterior fan after operation of the compressor, while repetitively measuring the temperature of the exterior heat exchanger until reaching a plateau temperature other than freezing. The exterior ambient temperature is set to the plateau temperature. In the event that the plateau temperature equals freezing, the exterior ambient temperature is set equal to a compromise temperature slightly above freezing, preferably 34 degrees Fahrenheit.

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