Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1988-11-01
1989-12-19
Tanner, Harry B.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62156, 62234, F25D 2106
Patent
active
048874361
ABSTRACT:
A defrosting system for a heat exchanger includes a temperature detector arranged adjacent to the exchanger, a temperature memory for storing temperature data detected by the detector, and a central processing unit, wherein when a second temperature which is detected by the temperature detector after normal operation requested by a user has restarted and after a predetermined minimum defrosting prohibitive time has passed, drops by a predetermined difference in temperature from a first temperature which is detected by the temperature detector after the normal operation has restarted and after a predetermined defrosting prohibitive time has passed, and the second temperature is a predetermined temperature or below; the central processing unit carries out the defrosting operation. As a result, when the amount of frost has rapidly increased during the defrosting prohibitive time, the defrosting operation is carried out even if the defrosting prohibitive time has not passed, thereby deteriorating the capability of the exchanger and preventing the frost from remaining after the defrosting operation has been completed.
REFERENCES:
patent: 4209994 (1980-07-01), Mueller et al.
patent: 4251988 (1981-02-01), Allard et al.
patent: 4406133 (1983-09-01), Saunders et al.
patent: 4662184 (1987-05-01), Pohl et al.
patent: 4751825 (1988-06-01), Voorhis et al.
Enomoto Toshihiko
Komai Takao
Mochizuki Tatsuya
Nakashima Yasuo
Watanabe Takashi
Mitsubishi Denki & Kabushiki Kaisha
Tanner Harry B.
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