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Tetrafluoropropene-based azeotropic compositions

An azeotropic composition and composition technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of compressor lubrication deterioration, net efficiency loss, refrigerant being captured by oil, etc., and achieve the effect of improving efficiency

Active Publication Date: 2019-06-04
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, due to the good solubility of HFO-1234 in POE oil, a problem has been found in heat transfer systems with oil separators: a relatively large amount of refrigerant is still trapped by the oil
This leads to a net loss of efficiency of the system as the entire refrigerant does not go through the refrigeration cycle and also leads to degradation of the lubrication of the compressors, especially screw compressors due to the lower oil quantity

Method used

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  • Tetrafluoropropene-based azeotropic compositions
  • Tetrafluoropropene-based azeotropic compositions
  • Tetrafluoropropene-based azeotropic compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0294] Supplier of POE Triton SE 55d oil: FUCHS

[0295] In oil separators integrated in screw compressors, the oil is recovered in the lower part of the separator. In this example, the amount of refrigerant trapped by the oil in the separator is analyzed.

[0296] The coolant / oil mixture in the separator is at temperature Ts (which is also the temperature of the refrigerant at the outlet of the compressor) and the pressure in the separator is equal to the refrigerant vapor saturation pressure (Pcond) at the inlet of the condenser. This therefore allows the system to operate at the condensation temperature (Tcond), which is the saturation temperature of the individual refrigerant at the corresponding Pcond pressure.

[0297] Typically, analysis of typical refrigerant / oil diagrams (such as e.g. figure 1 shown for R134a in ) shows that at constant pressure (Pcond), the concentration of refrigerant in the oil increases as the temperature of the mixture (oil / refrigerant, Ts) in...

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PUM

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Abstract

The present invention relates to azeotropic compositions comprising: between 74 and 81.5 wt.-% HFO-1324yf, between 6.5 and 10.5 wt.-% HFC-134a, and between 12 and 16 wt.-% HFC-152a, relative to the total weight of the composition, said azeotropic composition having a boiling point of between -40.00 and 70.00 deg c, at a pressure of between 0.5 and 21.0 bar abs (+ / - 0,5%). The invention also relates to the uses of the aforementioned compositions in heat transfer systems.

Description

technical field [0001] The present invention relates to tetrafluoropropene-based azeotropic compositions and their use as heat transfer fluids, especially in refrigeration, air conditioning and heat pumps. Background technique [0002] Problems posed by substances that deplete the ozone layer of the atmosphere were discussed in Montreal, where a protocol to mandate the reduction in the production and use of chlorofluorocarbons (CFCs) was signed. The protocol has been amended to phase out the use of CFCs and expand the regulations to include other products, including hydrochlorofluorocarbons (HCFCs). [0003] The refrigeration and air-conditioning industry has invested heavily in replacements (alternatives) to these refrigerants, so hydrofluorocarbons (HFCs) have come to market. [0004] In the automotive industry, air-conditioning systems for vehicles marketed in many countries have changed from chlorofluorocarbon (CFC-12) refrigerants to hydrofluorocarbons (1,1,1,2 tetrafl...

Claims

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Application Information

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IPC IPC(8): C09K5/04
CPCC09K5/045C09K2205/126C09K2205/22C09K2205/32C09K2205/122
Inventor W.拉切德
Owner ARKEMA FRANCE SA