DEFROST SYSTEM - MAEKAWA SEISAKUSHO KK

Title:

DEFROST SYSTEM

Document Type and Number:

WIPO Patent Application WO/2021/014526

Kind Code:

A1

Abstract:

[Problem] To provide a defrost system that can satisfactorily defrost without the introduction of a brine circuit and that can prevent the formation of icicles in a casing. [Solution] A defrost system 20 comprises: a thermosiphon defrost circuit 21 provided so as to branch off from a circulation line 30 and to form a CO2 circulation path with a fin tube heat exchanger 13 containing a CO2 refrigerant which, during a defrosting operation, repeatedly undergoes a two-phase change between a gaseous state and re-liquefaction; an electromagnetic opening/closing valve 34A, 34B that closes during a defrosting operation to make the CO2 circulation path a closed circuit; and a first electric heater 22 disposed above the thermosiphon defrost circuit so as to be adjacent thereto. The defrost system 20 allows the CO2 refrigerant to naturally circulate around the closed circuit during the defrosting operation.

Inventors:

YOSHIKAWA CHOIKU (JP)
KUTSUNA TOSHIO (JP)
MUGABI NELSON (JP)
KAYASHIMA DAIKI (JP)
OOSUGA NOBUO (JP)

Application Number:

PCT/JP2019/028629

Publication Date:

January 28, 2021

Filing Date:

July 22, 2019

Export Citation:

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Assignee:

MAEKAWA SEISAKUSHO KK (JP)

International Classes:

F25B47/02; F25D21/06

Domestic Patent References:

WO2015093233A1

2015-06-25

Foreign References:

US20150377541A1	2015-12-31
JP2000121233A	2000-04-28
JP2010060177A	2010-03-18
JP2013124812A	2013-06-24
JPH05306877A	1993-11-19
JPS6213977A	1987-01-22
JPH02197786A	1990-08-06
JP2015093233A	2015-05-18

Other References: