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Coolant

A refrigerant and cooling device technology, applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of inability to achieve high temperature stability, partial shift of azeotropic refrigerant dew point temperature, low cooling capacity, etc.

Pending Publication Date: 2020-09-15
WEISS UMWELTTECHNIK GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Refrigerants with a low GWP (e.g. <2500) have the disadvantage that these refrigerants tend to have a significantly lower cooling capacity in the temperature range relevant to the cooling circuit than refrigerants with a relatively higher GWP
Straight cooling circuits for test spaces require very high space temperature stability for precise control of the test chamber temperature, which cannot be achieved at all or only to a limited extent with azeotropic refrigerants
High temperature stability cannot be achieved in this case, since the dew point temperature or dew point of the azeotropic refrigerant may locally shift as a function of the temperature in the test space in the area of ​​the heat exchanger in the test space due to temperature differences

Method used

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Embodiment Construction

[0076] figure 2 A first embodiment of a cooling device 10 for a test chamber (not shown) is shown. The cooling device 10 comprises a cooling circuit 11 with a refrigerant, a heat exchanger 12 , a compressor 13 , a condenser 14 and an expansion element 15 . In the present case, the condenser 14 is cooled by a further cooling circuit 16 . A heat exchanger 12 is provided in a test space (not shown) of the test chamber. Furthermore, the cooling circuit 11 has a high-pressure side 17 and a low-pressure side 18 to which an internal heat exchanger 19 is connected.

[0077] figure 1 A pressure-enthalpy diagram (log p / h diagram) of the refrigerant circulating in the cooling circuit 11 , which is an azeotropic refrigerant, is shown. according to figure 1 and figure 2 The combined view of , starting from position A, the refrigerant upstream of the compressor 13 is sucked and compressed, whereby a pressure is obtained downstream of the compressor 13 according to position B. The r...

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Abstract

The invention relates to a refrigerant for a cooling device, a test chamber for conditioning air, and a use of the refrigerant for conditioning air in a test space of the test chamber. The cooling device comprises a cooling circuit with at least one heat exchanger, the refrigerant undergoing a phase transition in the heat exchanger, the refrigerant being a refrigerant mixture composed of a mass fraction of carbon dioxide (CO2), a mass fraction of difluoromethane (CH2F2) and a mass fraction of at least one other component, wherein the mass fraction of carbon dioxide in the refrigerant mixture is 5 to 65 mass percent, the mass fraction of difluoromethane being up to 68 mass percent, the other component being trifluoroiodomethane (CF3I), fluoromethane (CH3F), ethane (C2H6), 1,1-difluoroethene(C2H2F2), ethene (C2H4), fluoroethene (C2H3F), ethyne (C2H2), propane (C3H8), propene (C3H6) and / or fluoroethane (CH2FCH3), the mass fraction being up to 55 mass percent.

Description

technical field [0001] The invention relates to a refrigerant for cooling devices and to a test chamber with the refrigerant and to the use of the refrigerant for conditioning the air in the test space of the test chamber. Background technique [0002] This refrigerant usually circulates in the closed cooling circuit of the cooling unit and undergoes a series of different changes of state of matter. The refrigerants should have such properties that they can be used in the cooling circuit within a predetermined temperature difference. Single-component refrigerants and refrigerant mixtures of at least two components are known from the prior art. Before the priority date, the refrigerant was classified according to the latest edition of DIN 8960 Section 6. [0003] By law, refrigerants cannot significantly contribute to the depletion of ozone in the atmosphere or global warming. This means that essentially no fluorinated or chlorinated substances are used as refrigerants, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/04G05D23/20
CPCC09K5/044G05D23/20C09K2205/106C09K2205/122C09K2205/12C09K2205/126C09K2205/32G01N17/002F25B9/008C09K5/045F25B40/00F25B7/00F25B49/02F25B9/006C09K2205/128
Inventor 穆拉特·艾丁克里斯蒂安·哈克
Owner WEISS UMWELTTECHNIK GMBH
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