Defrost system for refrigeration apparatus, and cooling unit
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United States of America Patent
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Aug 29, 2017
Issued Date -
N/A
app pub date -
Nov 25, 2014
filing date -
Dec 17, 2013
priority date (Note) -
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Abstract
A defrost system includes: a cooling device in a freezer, and includes a casing, a heat exchanger pipe with a difference in elevation in the casing, and a drain receiver unit below the heat exchanger pipe; a refrigerating device to cool and liquefy CO2 refrigerant; and a refrigerant circuit for permitting the cooled and liquefied CO2 refrigerant to circulate to the heat exchanger pipe. The defrost system includes a bypass pipe of the heat exchanger pipe to form a CO2 circulation path; an on-off valve in the heat exchanger pipe to be closed during defrosting so that the CO2 circulation path is a closed circuit; a pressure adjusting unit for adjusting pressure of the CO2 refrigerant during defrosting; and a brine circuit as a first heating medium, in which the defrost system permits the CO2 refrigerant to naturally circulate in the closed circuit during defrosting by a thermosiphon effect.
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