Defrost control method and apparatus
AssigneeJTL Systems Limited
InventorJohn Michael Walmsley Lawrence
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Abstract
A defrost control system detects the variation in flow rate of refrigerant through an evaporator 8 while the flow is regulated to achieve a desired level of superheat at the outlet of the evaporator 8. When the flow rate becomes unstable, defrosting of the evaporator 8 is triggered.
Claims29
Apparatus for controlling defrosting of an evaporator in a heat transfer system, including a defrost controller arranged to detect variation in a flow of refrigerant through the evaporator while the superheat at an outlet of the evaporator is maintained substantially at a predetermined level, to calculate a volatility of the flow as the variation over a period and to initiate defrosting of the evaporator on the basis of said calculated volatility.
A method of controlling defrosting of an evaporator in a heat transfer system, including detecting variation in the flow of refrigerant through the evaporator while the superheat at an outlet of the evaporator is maintained substantially at a predetermined level, calculating a volatility of the flow as the variation of the flow over a period and initiating defrosting of the evaporator on the basis of the calculated volatility.
Dependencies are inferred from the claim text.