Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1986-11-14
1988-12-13
Tanner, Harry B.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62158, F25D 2106
Patent
active
047901446
ABSTRACT:
In a temperature control system when can be operated as a heat pump, frost deposited onto an outdoor heat exchanger (evaporator) is detected by a change in temperature of the refrigerant which flows into an indoor heat exchanger (condenser), so that a sensor to detect the deposition of the frost need not be attached to the outdoor heat exchanger. The refrigerant temperature is measured at the inlet of the indoor heat exchanger, and the temperature control system is switched to defrosting operation on the basis of this temperature and various elapsed time periods if the actual heat capability of the incoming refrigerant is insufficient, detecting the temperature of the refrigerant on the inlet side of the indoor heat exchanger, namely, by detecting the temeprature at a single position. Therefore, there is no need to use the frost deposition sensor on the outdoor side, frost deposition discriminating circuit by the signal of this sensor, signal lines to connect the frost deposition discriminating circuit with the main control circuit and the like which are provided in the room, and the like, so that the circuit can be simplified.
REFERENCES:
patent: 4299095 (1981-11-01), Cassarino
Fukuda Katsumi
Kaibara Makoto
Kuriyama Keiichi
Watanabe Masahiro
Yokouchi Akira
Matsushita Electric - Industrial Co., Ltd.
Tanner Harry B.
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