초록

An automatic defrost system in which the actual defrost time of an evaporator coil, for example, is the controlling parameter for establishing a defrost cycle. The system automatically adjusts itself so that a predetermined amount of frost builds up in the frost accumulating period.

대표청구항 ▼

A method for controlling the defrosting of a heat transfer unit of a temperature conditioning system by initiating a defrost operation when a predetermined amount of frost has accumulated on the unit during a frost accumulating period that occurs between defrost operations, a known desired defrost t

A method for controlling the defrosting of a heat transfer unit of a temperature conditioning system by initiating a defrost operation when a predetermined amount of frost has accumulated on the unit during a frost accumulating period that occurs between defrost operations, a known desired defrost time period being required to defrost said unit when it has the predetermined amount of accumulated frost thereon, said method comprising the steps determining the time required to actually defrost said unit during an actual defrost operation, increasing the frost accumulating period before initiating the next defrost operation if the time to complete the last defrost was less than said desired defrost time period, or decreasing the frost accumulating period before initiating the next defrost operation if the time to complete the last defrost was greater than said desired defrost time period.