Title:
CO2 REFRIGERATOR
Document Type and Number:
WIPO Patent Application WO/2007/046332
Kind Code:
A1
Abstract:
A CO2 refrigerator that is safe, permitting simultaneous drawout
of high-temperature heat source and low-temperature heat source with a temperature
difference therebetween, and that attains stabilization of control thereof,
realizing an enhancement of performance coefficient. There is provided a CO2
refrigerator using CO2 (carbon dioxide) as a refrigerant and having
a refrigeration cycle such that compression to a supercritical zone is followed
by decompression via an expansion valve to a pressure/temperature level of CO2
triple point or below to thereby attain evaporation, which CO2 refrigerator
comprises multistage compressors (3,4), intermediate cooler (6) disposed
on refrigerant flow channel (1) between condenser (5) and expansion means (7),
and second refrigeration cycle (2) branched from refrigerant flow channel (1)
between the condenser (5) and the intermediate cooler (6), passing via expansion
means (9) through the intermediate cooler (6) and connected to refrigerant flow
channel (1) between the multistage compressors (3,4), the second refrigeration
cycle (2) constructed so that in the intermediate cooler (6) there is carried
out absorption of evaporation latent heat between the same and the refrigerant
flow channel (1) to thereby maintain a pressure/temperature level of CO2
triple point (Ptr) or above even on the rear stream side of the expansion means
(9).
Inventors:
YAMAGUCHI HIROSHI (JP)
FUJIMA KATSUMI (JP)
MUGABI NERSON (JP)
YOSHIKAWA CHOIKU (JP)
FUJIMA KATSUMI (JP)
MUGABI NERSON (JP)
YOSHIKAWA CHOIKU (JP)
Application Number:
PCT/JP2006/320566
Publication Date:
April 26, 2007
Filing Date:
October 16, 2006
Export Citation:
Assignee:
MAEKAWA SEISAKUSHO KK (JP)
DOSHISHA (JP)
YAMAGUCHI HIROSHI (JP)
FUJIMA KATSUMI (JP)
MUGABI NERSON (JP)
YOSHIKAWA CHOIKU (JP)
DOSHISHA (JP)
YAMAGUCHI HIROSHI (JP)
FUJIMA KATSUMI (JP)
MUGABI NERSON (JP)
YOSHIKAWA CHOIKU (JP)
International Classes:
F25B1/10; F25B1/00; F25B7/00
Foreign References:
| JP2004308972A | 2004-11-04 | |||
| JP2001153476A | 2001-06-08 | |||
| JP2004170007A | 2004-06-17 | |||
| JP2004286289A | 2004-10-14 | |||
| JP2003329318A | 2003-11-19 | |||
| JP2004085099A | 2004-03-18 | |||
| JPH06159826A | 1994-06-07 | |||
| JP2001091074A | 2001-04-06 | |||
| JPH1130599A | 1999-02-02 |
Attorney, Agent or Firm:
TAKAHASHI, Masahisa et al. (Ambassador Roppongi Buildings 16-13, Roppongi 3-chom, Minato-ku Tokyo 32, JP)
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