Title:
REFRIGERATION CYCLE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/225178
Kind Code:
A1
Abstract:
The present invention prevents or reduces an increase in pressure of a refrigerant on the discharge side of a compressor in a secondary-side refrigerant circuit. A refrigeration cycle system (1) has a primary-side refrigerant circuit (5a) and a secondary-side refrigerant circuit (10). The secondary-side refrigerant circuit (10) has a secondary-side compressor (21), a cascade heat exchanger (35), a secondary-side expansion valve (36), and a use-side heat exchanger (52a-c), all connected to each other with a carbon dioxide refrigerant circulating therein. The secondary-side refrigerant circuit (10) has: a third heat source pipe (25) connecting the secondary-side compressor (21) and the cascade heat exchanger (35); a fourth heat source pipe (26) connecting the cascade heat exchanger (35) and the secondary-side expansion valve (36); a suction channel (23); and a bypass channel (47) connecting at least one of the third heat source pipe (25) and the fourth heat source pipe (26) and the suction channel (23). The primary-side refrigerant circuit (5a) has a cascade heat exchanger (35), and has a heating medium different from the carbon dioxide refrigerant circulating therein. When the cascade heat exchanger (35) is used as a radiator for the secondary-side refrigerant circuit (10) and as a heat absorber for the primary-side refrigerant circuit (5a), a control unit (80) activates the secondary-side compressor (21) of the secondary-side refrigerant circuit (10) after the heating medium flows to the cascade heat exchanger (35) in the primary-side refrigerant circuit (5a).
Inventors:
YAMANOI YOSHIKI
IYOSHI YUUTA
IYOSHI YUUTA
Application Number:
PCT/JP2021/017755
Publication Date:
November 11, 2021
Filing Date:
May 10, 2021
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
F25B7/00; F25B1/00
Domestic Patent References:
| WO2018235832A1 | 2018-12-27 |
Foreign References:
| JP2005077042A | 2005-03-24 | |||
| JP2012112615A | 2012-06-14 | |||
| JP2007248001A | 2007-09-27 | |||
| JP2003028524A | 2003-01-29 | |||
| JPS5938568A | 1984-03-02 | |||
| JP2012184873A | 2012-09-27 | |||
| JP2000121183A | 2000-04-28 | |||
| JP2004190917A | 2004-07-08 |
Attorney, Agent or Firm:
SHINJYU GLOBAL IP (JP)
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