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Substitute refrigerant for freon-12 centrifugal cold water machine set

A chiller and refrigerant technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of unsuitable centrifugal chillers and achieve the effect of reducing the impact of the greenhouse effect

Inactive Publication Date: 2006-10-11
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the scope of claims of this patent is not applicable to centrifugal chillers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: 28% HCFC-22, 61% HFC-227ea and 11% HFC-142b were physically mixed in the liquid phase.

Embodiment 2

[0064] Example 2: 15% HCFC-22, 68% HFC-227ea and 17% HFC-142b were physically mixed in the liquid phase.

Embodiment 3

[0065] Example 3: 28% HCFC-22, 60% HFC-227ea, 3% HC-600a and 9% HFC-142b were physically mixed in the liquid phase.

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PUM

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Abstract

The invention discloses an alternative refrigerant of Freon-12 centrifugal chiller, which relates to a refrigerant used in centrifugal chiller. The refrigerant contains chlorodifluoromethane, 1,1,1,2,3,3,3-heptafluoropropane and 1-monochloro-1,1-difluoroethane, and can also be composed of isobutane Quaternary mixture. Its preparation method is to physically mix the above-mentioned various components according to their corresponding proportions in the liquid phase. The refrigerant not only meets the requirements of environmental protection, but also is safe and reliable, and its refrigeration efficiency is equivalent to that of CFC-12. Moreover, the main components in the compressor and the system do not need to be changed, and the production line does not need to be modified, and can be directly charged. It is also slightly better than Freon-12 in performance, and can be used as a substitute refrigerant for Freon-12 in existing centrifugal chillers.

Description

Technical field [0001] The invention belongs to a refrigerant, and particularly relates to a refrigerant used in a centrifugal water chiller. Background technique [0002] Because of its low toxicity, non-flammable, non-corrosive, and compatibility with other materials, Freon-12 (CFC-12) has been widely used in refrigeration systems and other fields for a long time. However, since it was discovered in 1974 that CFC substances have a serious destructive effect on the atmospheric ozone layer, they have attracted increasing international attention and decided to gradually restrict the production and use of CFCs. my country will stop using CFC-12 on January 1, 2010. At present, as the refrigerant of centrifugal chillers, the use of CFC-12 still accounts for a considerable proportion. [0003] The parameters of the impeller speed and the basic size of the impeller of the CFC-12 centrifugal compressor are determined according to a certain evaporation temperature, condensation temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/04
Inventor 史琳朱明善韩礼钟王鑫王维东
Owner TSINGHUA UNIV
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