Title:
フッ素化炭化水素の混合物を冷媒として使用する方法、及び当該混合物を冷媒として使用した冷凍装置
Document Type and Number:
Japanese Patent JP6841066
Kind Code:
B2
Abstract:
The present invention provides a method for using, as an alternative refrigerant for R404A that is currently widely used, a refrigerant that has, for example, a non-flammability similar to that of R404A, a refrigerating capacity that can replace that of R404A, a COP equal or superior to that of R404A, and a lower GWP than that of R404A, as a refrigerant for a cooling system; as well as a refrigeration unit using the refrigerant. The method uses a mixture of fluorinated hydrocarbons as a refrigerant,(1) the mixture comprising difluoromethane (R32), pentafluoroethane (R125) and 1,1,1,2-tetrafluoroethane (R134a) in amounts such that the sum of the concentrations thereof is 99.5 wt% or more;(2) the composition ratio of the fluorinated hydrocarbons contained in the mixture falling within a triangle having, as vertices, the following three points in a ternary composition diagram in which the sum of the concentrations of R32, R125, and R134a is 100 wt%,point A (R32/R125/R134a = 37.3/17.0/45.7 wt%),point F (R32/R125/R134a = 30.7/10.9/58.4 wt%), andpoint G (R32/R125/R134a = 29.4/14.1/56.5 wt%); and(3) the mixture being used as a refrigerant in a cooling system comprising a heat exchanger in which a flow of the refrigerant and a flow of an external heat medium are counter flows.
Inventors:
Mitsuji Itano
Yasuo Yamada
Tsuchiya Tatsumi
Kuroki Makoto
Yasuo Yamada
Tsuchiya Tatsumi
Kuroki Makoto
Application Number:
JP2017018928A
Publication Date:
March 10, 2021
Filing Date:
February 03, 2017
Export Citation:
Assignee:
Daikin Industries, Ltd.
International Classes:
F25B1/00; C09K5/04
Domestic Patent References:
| JP9324175A | ||||
| JP10054618A | ||||
| JP61006566A | ||||
| JP2013032875A | ||||
| JP11094330A | ||||
| JP5034049A | ||||
| JP2075867A | ||||
| JP2869038B2 |
Foreign References:
| WO2016132818A1 |
Attorney, Agent or Firm:
Patent Business Corporation Saegusa International Patent Office