Binary refrigerating apparatus

a technology of refrigerating apparatus and binaries, which is applied in the direction of refrigerating machines, lighting and heating apparatus, compression machines with cascade operation, etc., can solve the problems of oil deterioration and sludge, and achieve the effect of solving combustibility concerns, reducing gwp value, and reducing gwp valu

Inactive Publication Date: 2016-01-21
PANASONIC HEALTHCARE HLDG CO LTD
View PDF5 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]The invention according to claim 1 of the present invention is a binary refrigerating apparatus including a high-temperature-side refrigeration circuit and a low-temperature-side refrigeration circuit, which achieves a refrigerating capacity of −80° C. or lower by condensing a refrigerant in the low-temperature-side refrigeration circuit with a refrigerant passing through a cascade condenser in the high-temperature-side refrigeration circuit, and wherein a refrigerant composition containing difluoroethylene (R1132a) and hexafluoroethane (R116) is used as the refrigerant in the low-temperature-side refrigeration circuit. Since difluoroethylene (R1132a) has a small GWP of 10 and a low boiling point of −85.7° C., the refrigerant composition has a small GWP to be earth friendly, and can achieve a low temperature of −80° C. Therefore, a significant effect in which the COP does not decrease, oil deterioration and sludge do not occur, and a risk of explosion is not caused is exerted. Also, the addition of an appropriate amount of R116 exerts a further significant effect of solving concerns on combustibility.
[0026]Since R116 has an extraordinarily high GWP value of 12200, the added amount of R116 is preferably configured to be a minimum for achieving non-combustion, thereby suppressing the GWP value to be low while maintaining non-combustion.
[0027]The invention according to claim 2 is a binary refrigerating apparatus comprising a high-temperature-side refrigeration circuit and a low-temperature-side refrigeration circuit, which achieves a refrigerating capacity of −80° C. or lower by condensing a refrigerant in the low-temperature-side refrigeration circuit with a refrigerant passing through a cascade condenser in the high-temperature-side refrigeration circuit, wherein a refrigerant composition containing difluoroethylene (R1132a) and carbon dioxide (R744) is used as the refrigerant in the low-temperature-side refrigeration circuit. Since difluoroethylene (R1132a) has a small GWP of 10 and a low boiling point of −85.7° C., and carbon dioxide (R744) has a GWP of 1, the refrigerant composition has a small GWP to be earth friendly, and can achieve a low temperature of −80° C. Furthermore, since carbon dioxide (R744) is added, the outlet pressure and the outlet temperature are inhibited from increasing. Therefore, a further significant effect in which the COP does not decrease, oil deterioration and sludge do not occur, and a risk of explosion is not caused is exerted.
[0028]The non-azeotropic mixture in which 20% by mass or less of carbon dioxide (R744) is mixed to difluoroethylene (R1132a) is used as the low-temperature-side refrigerant. R1132a is an A2 refrigerant (combustible refrigerant), and the mixture of R1132a and R744 is still an A2L refrigerant (slightly combustible refrigerant).
[0029]To address this concern, the addition of R116 can solve concerns on combustibility.
[0030]The invention according to claim 3 of the present invention is the binary refrigerating apparatus according to claim 1, wherein the use of a refrigerant composition in which carbon dioxide (R744) is further mixed as the refrigerant in the low-temperature-side refrigeration circuit, so that an evaporation temperature reaches a temperature lower than any boiling points of difluoroethylene (R1132a), hexafluoroethane (R116), and carbon dioxide (R744). R116 can solve concerns on combustibility while the addition of an appropriate amount of carbon dioxide (R744) inhibits the outlet pressure and the outlet temperature from increasing. Therefore, a further significant effect in which the COP does not decrease, oil deterioration and sludge do not occur, and a risk of explosion is not caused is exerted.

Problems solved by technology

However, the above-described R508A has a high GWP of 13200, which has been a problem.
Carbon dioxide (R744) has a small GWP of 1, but has a problem that oil deterioration and sludge occur due to increase in pressure and outlet temperature.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Binary refrigerating apparatus
  • Binary refrigerating apparatus

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056]A binary refrigerating apparatus illustrated in FIG. 1 was stably and continuously operated at an outside air temperature of −10° C. for a long time. Thereafter, a cycle S1 and a cycle S2 were measured for temperatures at the points described below.

[0057]In the high-temperature-side refrigerant cycle S1, a refrigerant composition (GWP value: 1500 or less, boiling point: about −40° C. at atmospheric pressure) containing a non-azeotropic mixture comprising the refrigerant group of difluoromethane (R32), pentafluoroethane (R125), 1,1,1,2-tetrafluoroethane (R134a) and 1,1,3-trifluoroethane (R143a), and 1,1,1,2,3-pentafluoropentene (HFO-1234ze), was filled.

[0058]This refrigerant mixture condensed in each of condensers 3,5 and 8, was decompressed in a capillary tube 10, and flowed into a cascade condenser 11 to evaporate. The temperature at an exit of the cascade condenser 11 was −54.9° C.

[0059]On the other hand, in the low-temperature-side refrigerant cycle S2, a refrigerant compos...

example 2

[0061]In the high-temperature-side refrigerant cycle S1 and the low-temperature-side refrigerant cycle S2, the same refrigerant compositions as those in Example 1 were filled. Then, the binary refrigerating apparatus illustrated in FIG. 1 was stably and continuously operated at an outside air temperature of 31.1° C. for a long time. Thereafter, the cycle S1 and the cycle S2 were measured for temperatures at the points described below.

[0062]The temperature at an exit of the cascade condenser 11 was −35.9° C.

[0063]The temperature of the outlet-side pipe 15 at the refrigerant exit of the compressor 6 in the low-temperature-side refrigerant cycle S2 was 79.0° C.; the temperature of the inlet-side pipe 26 at the refrigerant inlet to the compressor 6 was 7.6° C.; the temperature of the entrance pipe 23 to the evaporator 24 was −90.2° C.; the temperature of the exit pipe 25 from the evaporator 24 was −81.8° C.; and the temperature inside the freezer (not shown) was −87.6° C.

[0064]Also, a r...

example 3

[0065]The binary refrigerating apparatus illustrated in FIG. 1 was stably and continuously operated at an outside air temperature of −0.4° C. for a long time. Thereafter, the cycle S1 and the cycle S2 were measured for temperatures at the points described above.

[0066]In the high-temperature-side refrigerant cycle S1, a refrigerant composition (GWP value: 1500 or less, boiling point: about −40° C. at atmospheric pressure) containing a non-azeotropic mixture comprising the refrigerant group of difluoromethane (R32), pentafluoroethane (R125), 1,1,1,2-tetrafluoroethane (R134a) and 1,1,3-trifluoroethane (R143a), and 1,1,1,2,3-pentafluoropentene (HFO-1234ze), was filled.

[0067]This refrigerant mixture condensed in each of the condensers 3,5 and 8, was decompressed in the capillary tube 10, and flowed into the cascade condenser 11 to evaporate. The temperature at the exit of the cascade condenser 11 was −53.1° C.

[0068]On the other hand, in the low-temperature-side refrigerant cycle S2, a re...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
temperatureaaaaaaaaaa
boiling pointaaaaaaaaaa
boiling pointaaaaaaaaaa
Login to view more

Abstract

A binary refrigerating apparatus employs a refrigerant composition that has a small global-warming potential (GWP) to be earth friendly, can be used as a refrigerant capable of achieving a low temperature of −80° C., and is excellent in refrigerating capacity and other performance. A refrigerant composition used as a low-temperature-side refrigerant is a refrigerant mixture including a non-azeotropic mixture in which 20% by mass or less of carbon dioxide (R744) is mixed to difluoroethylene (R1132a). A refrigerant composition used as a high-temperature-side refrigerant is a combination of: a non-azeotropic mixture comprising the refrigerant group of difluoromethane (R32), pentafluoroethane (R125), 1,1,1,2-tetrafluoroethane (R134a) and 1,1,3-trifluoro ethane (R143a); and 1,1,1,2,3-pentafluoropentene (HFO-1234ze), having a global-warming potential (GWP) of 1500 or less.

Description

TECHNICAL FIELD[0001]The present invention relates to a binary refrigerating apparatus including a refrigerant mixture. The present invention more particularly relates to: a refrigerant composition that has a small global-warming potential (hereinafter, referred to as a GWP) to be earth friendly, can be used as a refrigerant capable of achieving a low temperature of −80° C., and is excellent in refrigerating capacity and other performance; and a binary refrigerating apparatus that includes the refrigerant composition and can actually achieve low temperature.BACKGROUND ART[0002]Conventionally used refrigerants for refrigerators include a non-azeotropic mixture (R407D) of difluoromethane (R32) / pentafluoroethane (R125) / 1,1,1,2-tetrafluoroethane (R134a) (15 / 15 / 70% by mass) and a non-azeotropic mixture (R404A) of pentafluoroethane (R125) / 1,1,1-trifluoroethane (R143a) / 1,1,1,2-tetrafluoroethane (R134a) (44 / 52 / 4% by mass). The boiling point of R407D is about −39° C., and the boiling point o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): F25B7/00C09K5/04
CPCF25B7/00C09K2205/34C09K2205/22C09K5/045C09K2205/106C09K2205/126F25B9/006
Inventor YUZAWA, JIROTOYOOKA, TAKASHI
Owner PANASONIC HEALTHCARE HLDG CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap