Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1993-03-22
1995-01-10
Tanner, Harry B.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62156, 62234, F25D 2106
Patent
active
053796080
ABSTRACT:
A defrosting control unit for providing centralized control of the defrosting a showcase having showcase units with defrosting devices includes an environmental informer ion signal generation portion and a defrosting control portion. The signal generation portion generates a signal reflecting at least one environmental parameter such as whether it is daytime or nighttime, the difference in air temperature measured at different places in a showcase unit, the deviation of the temperature difference with respect to a steady-state value, and the temporal variation of the deviation. The defrosting control portion receives the environmental information signal from the signal generation portion and sends a defrosting start signal and a defrosting end signal to the defrosting devices at a time interval . The signal generation portion may include a fuzzy reasoning portion, membership functions, and rules so that an inference on the optimal time for starting a defrosting operation can be made. The optimal time for starting a defrosting may also be obtained by a defrosting timer and a day
ight judgment portion. A centralized showcase defrosting system includes such a defrosting centre unit in addition to a showcase unit having an inner duct, an evaporator and a defrosting device attached to the evaporator, the defrosting device having a heater for melting frost which has been deposited on the surface of the evaporator.
REFERENCES:
patent: 4395887 (1983-08-01), Sweetman
patent: 5167365 (1992-12-01), Mitoshi et al.
Ishimaru Keiichi
Itoh Osamu
Kurita Masaya
Nakatani Tomoyoshi
Sudo Haruhiko
Fuji Electric & Co., Ltd.
Tanner Harry B.
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