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A method of defrosting a refrigerating circuit for use in cooling a vehicular chamber comprises two steps. In a first step a frost formed at an outer surface of an evaporator of a cooling unit is defrosted by directly leading discharged gas to the evaporator. In a second step a frost formed at eleme

A method of defrosting a refrigerating circuit for use in cooling a vehicular chamber comprises two steps. In a first step a frost formed at an outer surface of an evaporator of a cooling unit is defrosted by directly leading discharged gas to the evaporator. In a second step a frost formed at elements of the cooling unit except the evaporator is defrosted by making air in the vehicular chamber pass through the heated evaporator. In this manner, the cooling down characteristic in the vehicular chamber is improved and compressor durability is preserved.

대표청구항 ▼

In a refrigerating circuit for use in cooling a vehicular chamber including a compressor, a condenser for condensing refrigerant gas discharged from said compressor, an expansion valve for expanding condensed refrigerant flowing from said condenser, a cooling unit having an evaporator and a fan disp

In a refrigerating circuit for use in cooling a vehicular chamber including a compressor, a condenser for condensing refrigerant gas discharged from said compressor, an expansion valve for expanding condensed refrigerant flowing from said condenser, a cooling unit having an evaporator and a fan disposed within the vehicular chamber to be cooled, and a controlled valve member for selectively switching a course of a flow of refrigerant gas discharged from said compressor in order to directly lead said discharged refrigerant gas to said evaporator, said fan for causing air in said vehicular chamber to pass through said evaporator, a method for defrosting a frost formed at said cooling unit comprising a first step of defrosting a frost formed at an outer surface of said evaporator by directly leading said discharged refrigerant gas to said evaporator and a second step of defrosting a frost formed at said cooling unit in addition to said evaporator by causing air in the vehicular chamber to pass through said evaporator, said first step being initiated when a command signal for defrosting a frost formed at said cooling unit is generated, said first step being terminated at the earlier point in time either of when the duration of operation of said first step exceeds a first predetermined period of time or when a temperature of an outer surface of said evaporator reaches or exceeds a predetermined value, said second step being initiated in operation after said first step is terminated, said second step being terminated when the duration of operation of said secnd step exceeds a second predetermined period of time.