Patent ID: 9746221
Date: 2017-08-29
CPC Classifications: F25B,F25D

Claim:
1. A defrost system for a refrigeration apparatus including: a cooling device which is disposed in a freezer, and includes a casing, a heat exchanger pipe with a difference in elevation disposed in the casing, and a drain receiver unit disposed below the heat exchanger pipe; a refrigerating device configured to cool and liquefy CO 2 refrigerant; and a refrigerant circuit for permitting the CO 2 refrigerant cooled and liquefied in the refrigerating device to circulate to the heat exchanger pipe, the defrost system comprising: a bypass pipe connected between an inlet path and an outlet path of the heat exchanger pipe to form a CO an on-off valve disposed in each of the inlet path and the outlet path of the heat exchanger pipe and configured to be-closed at a time of defrosting so that the CO a pressure adjusting unit for adjusting pressure of the CO a brine circuit in which brine as a first heating medium circulates and which includes a first lead path disposed adjacent to the heat exchanger pipe in the cooling device and forming a first heat exchanger part for heating the CO the defrost system configured to permitting the CO