F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
341/4
F25D 21/06 (2006.01) F25B 47/02 (2006.01) F25D 21/00 (2006.01) F25B 13/00 (2006.01)
Patent
CA 1298383
ABSTRACT The present application discloses a method for con- trolling the defrosting of a heat transfer unit of a tempera- ture conditioning system by initiating a defrost operation when a predetermined amount of frost has accumulated on the unit during a frost accumulation period that occurs between defrost operations, a predetermined desired defrost time being required to defrost said unit when it has the predeter- mined amount of frost accumulated thereon. The method includes the steps of: sensing the unit temperature, deter- mining the time required to defrost the unit, increasing the frost accumulating period before initiating the next defrost operation if the time to complete the last defrost was less than the desired defrost period, or decreasing the frost accumulating period if the time to complete the last defrost was greater than desired, sensing the ambient temperature in the vicinity of the unit, determining the temperature differ- ential the unit and ambient, and during at least a first portion of the first accumulating period initiating the defrost operation when the temperature differential exceeds a threshold value.
575629
Allard John J.
Bos Peter J.
Allard John J.
Baker Harold C.
Bos Peter J.
Paragon Electric Company Inc.
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