Refrigeration apparatus

Patent metadata

Field	Value
Publication number	US-2016178246-A1
Application number	US-201615057950-A
Country	US
Kind code	A1
Filing date	Mar 1, 2016
Priority date	Sep 27, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

A refrigeration apparatus includes: a refrigerant circuit constituted by a compressor, a condenser, a decompressor, and an evaporator connected in this order in a loop, wherein, as a refrigerant in the refrigerant circuit, a refrigerant composite material that contains a first refrigerant of an ultralow temperature range refrigerant having a boiling point of not less than −89.0° C. and not more than −78.1° C., carbon dioxide (R744), and a second refrigerant that is soluble in the carbon dioxide (R744) at a temperature lower than a boiling point of the carbon dioxide (R744) is used.

First claim

What is claimed is:

1 . A refrigeration apparatus, comprising:
a refrigerant circuit constituted by a compressor, a condenser, a decompressor, and an evaporator connected in this order in a loop, wherein, as a refrigerant in the refrigerant circuit, a refrigerant composite material that contains a first refrigerant of an ultralow temperature range refrigerant having a boiling point of not less than −89.0° C. and not more than −78.1° C., carbon dioxide (R744), and a second refrigerant that is soluble in the carbon dioxide (R744) at a temperature lower than a boiling point of the carbon dioxide (R744) is used, refrigeration performance of not more than −80° C. is achieved by causing the first refrigerant to evaporate in the evaporator, and as the second refrigerant dissolves the carbon dioxide (R744), the carbon dioxide (R744) is retained in a liquid phase or in a gas phase or the solidified carbon dioxide (R744) is melted in a suction pipe through which the refrigerant that returns from the evaporator to the compressor passes.

2 . The refrigeration apparatus according to claim 1 , wherein
the first refrigerant contains difluoroethylene (R1132a), a mixed refrigerant of difluoroethylene (R1132a) and hexafluoroethane (R116), a mixed refrigerant of difluoroethylene (R1132a) and ethane (R170), ethane (R170), a mixed refrigerant of ethane (R170) and hexafluoroethane (R116), an azeotropic mixture (R508A, boiling point −85.7° C.) of 39 mass % trifluoromethane (R23) and 61 mass % hexafluoroethane (R116), or an azeotropic mixture (R508B, boiling point −86.9° C.) of 46 mass % trifluoromethane (R23) and 54 mass % hexafluoroethane (R116).

3 . The refrigeration apparatus according to claim 1 , wherein
the second refrigerant contains difluoromethane (R32), 1,1,1,2-tetrafluoroethane (R134a), n-pentane (R600), isobutane (R600a), 1,1,1,2,3-pentafluoropentene (HFO-1234ze), or 1,1,1,2-tetrafluoropentene (HFO-1234yf).

4 . The refrigeration apparatus according to claim 1 , wherein
the carbon dioxide (R744) is added in a proportion greater than 20% to a total mass of the refrigerant composite material.

5 . The refrigeration apparatus according to claim 1 , wherein
the second refrigerant is added in a proportion at which the carbon dioxide (R744) can be prevented from turning into dry ice.

6 . The refrigeration apparatus according to claim 1 , wherein
the refrigerant circuit includes a high-temperature-side refrigerant circuit and a low-temperature-side refrigerant circuit that each constitute an independent refrigerant closed circuit that condenses a refrigerant discharged from a compressor, decompresses the refrigerant with a capillary tube, and exhibits a cooling effect by causing the refrigerant to evaporate in an evaporator, the evaporator in the high-temperature-side refrigerant circuit and the condenser in the low-temperature-side refrigerant circuit constitute a cascade heat exchanger, and the refrigerant composite material is used as a refrigerant in the low-temperature-side refrigerant circuit that exhibits a final cooling effect in the evaporator in the low-temperature-side refrigerant circuit.

Assignees

• Panasonic Healthcare Holdings Co Ltd

Inventors

• Toyooka Takashi
• Yuzawa Jiro

Classifications

• F25B9/008

  the refrigerant being carbon dioxide · CPC title

• C09K5/041

  for compression-type refrigeration systems · CPC title

• C09K5/042

  comprising compounds containing carbon and hydrogen only · CPC title

• F25B40/00

  Subcoolers, desuperheaters or superheaters · CPC title

• C09K2205/122

  Halogenated hydrocarbons · CPC title