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N2O-containing low temperature mixing working substance for cascade refrigeration system

A technology of mixed working fluid and cascade refrigeration, applied in chemical instruments and methods, materials for heat exchange, etc., can solve the problems of low volume refrigeration and large charging capacity, and achieves reduction of charging capacity, emission reduction, and large load. desired effect

Inactive Publication Date: 2009-05-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the working fluid of the cascade refrigeration system used more often is R134a / R23, but its greenhouse effect potential value (GWP) is high, and the charging volume is large, and the volume refrigeration is low

Method used

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  • N2O-containing low temperature mixing working substance for cascade refrigeration system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Take 60% R744A and 40% R170 according to the mass fraction, and physically mix them at room temperature to obtain a refrigerant.

Embodiment 2

[0026] Embodiment 2: Take 50% R744A, 35% R170 and 15% R23 according to the mass fraction, and use them as refrigerant after physical mixing at normal temperature.

Embodiment 3

[0027] Embodiment 3: 35% of R744A, 20% of R170 and 45% of R41 are taken according to the mass fraction, and they are used as refrigerant after physical mixing at normal temperature.

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PUM

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Abstract

The invention relates to a cascade refrigeration system low-temperature mixed refrigerant which is applicable to the temperature area of 180-220K and contains N2O, and a preparation method thereof; the low-temperature mixed refrigerant comprises one or two components of low-boiling point refrigerant N2O(R744A), ethane (R170), fluoromethane (R23), hexafluoroethane (R116), fluoromethane (R41), and CO2 (R744) and is formed by physical mixing at normal temperature. The low-temperature mixed refrigerant damages no ozonosphere, has low greenhouse effect potential, meets the requirement of environmental protection, has suitable thermal parameters and excellent circulation performance, and can optimize and design the new refrigerant system by the existing cascade low-temperature compressor. The mixed refrigerant can be used for replacing the refrigerant in the existing cascade refrigeration low-temperature system.

Description

technical field [0001] The invention belongs to the technical field of utilizing cascade system refrigeration, in particular to a 2 O(R744A) cascade refrigeration system cryogenic mixed working fluid. Background technique [0002] The minimum refrigeration temperature achieved by a single-stage vapor compression refrigeration cycle is generally 230K. When the condensing pressure is constant, if you want to achieve a lower evaporation temperature, the system pressure ratio will increase, the gas transmission coefficient will decrease, and the cooling capacity will decrease. The efficiency of the compressor decreases, the power consumption increases, the exhaust temperature increases, and the operating conditions deteriorate. In order to achieve a lower temperature, a multi-stage compression refrigeration cycle system and an external cascade refrigeration cycle system can be used, but the multi-stage compression system requires a special compressor, and the refrigeration syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/04
Inventor 冯永斌晏刚钱文波陶锴张敏
Owner XI AN JIAOTONG UNIV
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