US2012241665A1PendingUtilityA1

Refrigerant composition comprising difluoromethane (hfc32) and 2,3,3,3-tetrafluoropropene (hfo1234yf)

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Assignee: SHIBANUMA TAKASHIPriority: Jan 27, 2010Filed: Jan 27, 2011Published: Sep 27, 2012
Est. expiryJan 27, 2030(~3.5 yrs left)· nominal 20-yr term from priority
Inventors:Takashi ShibanumaYasufu Yamada
C09K 2205/126F25B 2400/121C09K 5/045C09K 2205/22C09K 2205/122F25B 9/006F25B 1/00Y02P20/10
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Claims

Abstract

An object of the present invention is to provide a refrigerant composition having a reduced amount of comprehensive environmental load, in which the refrigerant composition has low GWP (direct impact on global warming is low), and has good energy efficiency (indirect impact on global warming is low) when used in a device. The present invention provides a refrigerant composition comprising 30 to 50 mass % of difluoromethane (HFC32) and 70 to 50 mass % of 2,3,3,3-tetrafluoropropene (HFO1234yf).

Claims

exact text as granted — not AI-modified
1 . A refrigerant composition comprising 30 to 50 mass % of difluoromethane (HFC32) and 70 to 50 mass % of 2,3,3,3-tetrafluoropropene (HFO1234yf). 
     
     
         2 . The refrigerant composition according to  claim 1 , comprising 35 to 45 mass % of difluoromethane (HFC32) and 65 to 55 mass % of 2,3,3,3-tetrafluoropropene (HFO1234yf). 
     
     
         3 . The refrigerant composition according to  claim 1  further comprising a polymerization inhibitor. 
     
     
         4 . The refrigerant composition according to  claim 1  further comprising a stabilizer. 
     
     
         5 . The refrigerant composition according to  claim 1  further comprising refrigerant oil. 
     
     
         6 . The refrigerant composition according to  claim 1 , wherein the refrigerant composition is used in a refrigeration unit provided with a countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger. 
     
     
         7 . The refrigerant composition according to  claim 6 , wherein the refrigerant composition is used in the refrigeration unit further provided with a countermeasure to reduce the effect of pressure loss. 
     
     
         8 . The refrigerant composition according to  claim 6 , wherein the countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger is at least one of the following: eliminating the temperature difference between air and refrigerant by countercurrent flow, preventing frost formation near an inlet of an evaporator, and increasing the heat-transfer coefficient of a heat exchanger. 
     
     
         9 . The refrigerant composition according to  claim 7 , wherein the countermeasure to reduce the effect of pressure loss is at least one of the following: increasing the tube diameter of a heat exchanger or optimizing the number of paths in a heat exchanger, increasing the pipe diameter or shortening the length of a pipe in an air conditioner and a connecting pipe for an air conditioner, using an ejector as an expansion mechanism; and using an economizer cycle. 
     
     
         10 . The refrigerant composition according to  claim 2  further comprising a polymerization inhibitor. 
     
     
         11 . The refrigerant composition according to  claim 2  further comprising a stabilizer. 
     
     
         12 . The refrigerant composition according to  claim 2  further comprising refrigerant oil. 
     
     
         13 . The refrigerant composition according to  claim 2 , wherein the refrigerant composition is used in a refrigeration unit provided with a countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger. 
     
     
         14 . The refrigerant composition according to  claim 3 , wherein the refrigerant composition is used in a refrigeration unit provided with a countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger. 
     
     
         15 . The refrigerant composition according to  claim 4 , wherein the refrigerant composition is used in a refrigeration unit provided with a countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger. 
     
     
         16 . The refrigerant composition according to  claim 5 , wherein the refrigerant composition is used in a refrigeration unit provided with a countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger. 
     
     
         17 . The refrigerant composition according to  claim 10 , wherein the refrigerant composition is used in a refrigeration unit provided with a countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger. 
     
     
         18 . The refrigerant composition according to  claim 11 , wherein the refrigerant composition is used in a refrigeration unit provided with a countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger. 
     
     
         19 . The refrigerant composition according to  claim 12 , wherein the refrigerant composition is used in a refrigeration unit provided with a countermeasure to prevent heat exchange efficiency from decreasing due to the temperature glide in a heat exchanger. 
     
     
         20 . The refrigerant composition according to  claim 13 , wherein the refrigerant composition is used in the refrigeration unit further provided with a countermeasure to reduce the effect of pressure loss.

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