Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1986-01-06
1987-05-05
Tanner, Harry
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62234, F25D 2106
Patent
active
046621849
ABSTRACT:
Disclosed are apparatus and methods for controlling the defrosting of the outdoor heat exchange coil of a heat pump. In general, the disclosed apparatus and methods use the differencee between the outdoor heat exchanger and the outdoor ambient temperature to determine when to initiate a defrosting operation. Only a single sensor is employed, this single sensor being positioned at least proximate the outdoor heat exchanger such that the sensor responds to ambient temperature when the heat pump is first started and the heat exchanger is free of frost, and such that the sensnor becomes surrounded with frost as frost builds up on the heat exchanger during operation. At the beginning of a run the sensor is employed to read the ambient temperature, which is memorized. As frost builds, the sensor begins to reflect the temperature of the heat exchanger as the sensor becomes increasingly insulated by the frost from the surrounding air. During operation thereafter, the sensor is periodically read, the difference between the prevailing sensor temperature and the stored reference is determined and compared to an established difference reference, and a defrosting operation is initiated if the comparison difference exceeds the difference reference. The single sensor is also employed to determine when to terminate a defrosting operation, and also to determine whether to operate the outdoor fan as an aid to a defrosting operation.
REFERENCES:
patent: 2104219 (1938-01-01), Bloom
patent: 4102391 (1978-07-01), Noland et al.
patent: 4215555 (1980-08-01), Pohl
patent: 4373349 (1983-02-01), Mueller
patent: 4432211 (1984-02-01), Oishi et al.
Hicks Frederick E.
McCarty William J.
Pohl Walter J.
General Electric Company
Houser H. Neil
Reams Radford M.
Tanner Harry
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