Fuzzy logic adaptive defrost control

Details Fuzzy logic adaptive defrost control Fuzzy logic adaptive defrost control

F - Mech Eng,Light,Heat,Weapons

25

B

F25B 47/02 (2006.01) F25B 49/02 (2006.01) F25D 21/00 (2006.01)

Patent

CA 2149564

The defrosting of a heat transfer unit of a temperature conditioning system is controlled by initiating a defrost operation when a predetermined amount of frost has accumulated on the unit during a period between defrost operations. A known desired defrost time period is required to defrost the unit when it has the predetermined amount of accumulated frost thereon. The time required to actually defrost the unit during a first defrost operation is measured to form a first defrost time. The time required to actually defrost the unit during a second defrost operation is measured, the second defrost operation is the next defrost operation following the first defrost time and forms a second defrost time. The frost accumulating period is modified in response to said first defrost time and said second defrost time.

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