Incombustible mixed refrigerant suitable for -50 to -70 DEG C temperature range of refrigeration

A technology of mixing refrigerants and refrigerants, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of high exhaust temperature, compressor burnout, and high exhaust pressure, and achieves high refrigeration coefficient and reduced failure rate. , the effect of unit work increase

Inactive Publication Date: 2016-08-24
张永康
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the refrigeration system operates at a pressure ratio greater than 12, it will cause the exhaust temperature to be too high, the exhaust pressure to be too high, and the compressor temperature to be too high, which will lead to compressor overload, compressor burnout and other faults, which will make the entire refrigeration system fail. run
Usually, to achieve a low temperature of -50 degrees to -70 degrees, a cascade refrigeration cycle refrigeration system must be used. The cascade refrigeration system has disadvantages such as complex refrigeration system, poor reliability, difficult maintenance, high maintenance cost, and serious power con

Method used

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  • Incombustible mixed refrigerant suitable for -50 to -70 DEG C temperature range of refrigeration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Configure the mixed refrigerant used in the temperature zone of -50 degrees; the molar concentration of each type of refrigerant is as follows:

[0030] The first type: R245Fa accounts for 15% of the total molar concentration, and R236Fa accounts for 20% of the total molar concentration

[0031] The second type: R125 accounts for 35% of the total molar concentration or R32 accounts for 35% of the total molar concentration or R507 accounts for 35% of the total molar concentration

[0032] The third category: R23 accounts for 24% of the total molar concentration

[0033] The fourth category: R14 accounts for 6% of the total molar concentration

[0034] The operating parameters are: condensing temperature 35 degrees, refrigeration temperature -50 degrees, exhaust pressure 1.83 MPa, evaporation pressure 0.4 MPa, compressor exhaust temperature 108 degrees.

Embodiment 2

[0035] Embodiment 2: Configure the mixed refrigerant used in the temperature zone of -60 degrees; the molar concentration of each type of refrigerant is as follows:

[0036] The first type: R245Fa accounts for 20% of the total molar concentration, R236Fa accounts for 15% of the total molar concentration

[0037] The second type: R125 accounts for 25% of the total molar concentration or R32 accounts for 25% of the total molar concentration or R507 accounts for 25% of the total molar concentration

[0038] The third category: R23 accounts for 34% of the total molar concentration

[0039] The fourth category: R14 accounts for 6% of the total molar concentration

[0040] The operating parameters are: condensing temperature 35 degrees, refrigeration temperature -60 degrees, exhaust pressure 1.73 MPa, evaporation pressure 0.35 MPa, compressor exhaust temperature 103 degrees.

Embodiment 3

[0041] Embodiment 3: Configure the mixed refrigerant used in the temperature zone of -70 degrees; the molar concentration of each type of refrigerant is as follows:

[0042] The first type: R245Fa accounts for 15% of the total molar concentration, and R236Fa accounts for 20% of the total molar concentration

[0043] The second type: R125 accounts for 25% of the total molar concentration or R32 accounts for 25% of the total molar concentration or R507 accounts for 25% of the total molar concentration

[0044] The third category: R23 accounts for 24% of the total molar concentration

[0045] The fourth category: R14 accounts for 16% of the total molar concentration

[0046] The operating parameters are: condensing temperature 35 degrees, refrigeration temperature -70 degrees, exhaust pressure 1.60 MPa, evaporation pressure 0.3 MPa, compressor exhaust temperature 102 degrees.

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Abstract

The invention relates to an incombustible mixed refrigerant suitable for the -50 to -70 DEG C temperature range of refrigeration. A first refrigerant is R245Fa (pentafluoropropane) or R236Fa (hexafluoropropane); a second refrigerant is R125 (pentafluoroethane) or R32 (difluoromethane) or R507; a third refrigerant is R23 (trifluoromethane); and a fourth refrigerant is R14 (carbon tetrafluoride). The total molar concentration of the four refrigerants is 100%. The invention has the following beneficial effects: the incombustible mixed refrigerant suitable for the -50 to -70 DEG C temperature range of refrigeration has a simple system and reliable performance, and is nontoxic, environmentally friendly and incombustible; the refrigerants are all commercially available, are convenient to purchase and are low-cost; and the product is more convenient for maintenance technicians to operate.

Description

technical field [0001] The invention relates to the field of refrigeration systems, in particular to a non-flammable mixed refrigerant suitable for the refrigeration temperature range of -50°C to -70°C. Background technique [0002] With the development of society and the advancement of science and technology, and the rapid development of high-tech fields such as bioengineering, medicine, energy, communications, and military industry, there is an increasing demand for refrigeration products in the temperature range of -50°C to -70°C. The traditional single-stage compression refrigeration system cannot achieve a temperature range of -50 degrees to -70 degrees, and the pressure ratio of the compressor must be less than 12 when the refrigeration system is running. When the ambient temperature is determined, the refrigerant used in the refrigeration system corresponds to the condensing temperature and condensing pressure (exhaust pressure) of the compressor. At the same time, it...

Claims

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Application Information

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IPC IPC(8): C09K5/04
Inventor 张永康
Owner 张永康
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