Engineering, 12.01.2022 14:00 spalmer8

In what type of defrost system is air from the conditioned space circulated over the evaporator when the compressor is not running

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An off cycle defrost is just as it sounds; defrosting is accomplished by simply shutting off the refrigeration cycle, preventing refrigerant from entering the evaporator. Even though the evaporator might be operating below 32F, the air temperature in the refrigerated space is above 32F.

On low temperature applications, off cycle defrost is not practical given that the air in the refrigerated space is below 32F. Therefore, in addition to shutting off the refrigeration cycle, an external source of heat is required to raise the evaporator temperature.

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