Regular defrost of air cooling coils is necessary to restore cooling performance but creates parasitic load onthe refrigeration system and can result in short term temperature fluctuations in the refrigerated space. A newmethod that directly links defrost heat load to latent loads in the refrigerated facility and likely melt waterflows is presented. Practical guidance, that is informed by both this method and measurements for actualsystems, is provided for the optimization of defrost frequency and duration. Key aspects are: to have amethod that terminates defrost once the coil is free of frost and there is no more melt water to avoidunproductive heating; and to vary the frequency of defrost to match the latent load the facility experiences sothere is a similar frost loading at the start of each defrost.
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