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Tile purpose of this project was to develop and commercialize a demand defrost controlle, (hat initiates defrosts of refrigeration systems only when required. The standard method of control is a time clock that usually defrosts too often, which wastes energy. The controller developed by this project uses an algorithm based on the temperature difference between the discharge and return of the display case air curtain along with several time settings to defrost only when needed. This controllerdoi:10.2172/10106766 fatcat:hyzi76fmhjbkpnfukhewahhycq