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Refrigerant for replacing freon-12 in centrifugal type cooling water unit

A chiller and refrigerant technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems affecting the normal operation of the unit, and achieve the effect of reducing the greenhouse effect and protecting the ozone layer

Active Publication Date: 2006-08-02
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (2). The cooling capacity per unit volume must be equal to or slightly lower than that of Freon-12;
However, when it operates under low load conditions, it is easier to enter the surge state than Freon-12, that is, under the same external low load demand, this invention will enter the surge state earlier, affecting the normal operation of the unit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: 1% of chlorodifluoromethane (HCFC-22), 52.5% of 1,1,1,2-tetrafluoroethane (HFC-134a) and 46.5% of 1,1,1,2 , 3,3,3-heptafluoropropane (HFC-227ea) three substances are physically mixed in the liquid phase and then filled into the flooded evaporator unit; or 2% of chlorodifluoromethane (HCFC-22), 58 % of 1,1,1,2-tetrafluoroethane (HFC-134a) and 40% of 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) in the liquid phase After physical mixing, it is charged into the dry evaporator unit. Its environmental parameters, physical parameters and thermal performance are shown in Table 6.

Embodiment 2

[0052] Example 2: 4% of chlorodifluoromethane (HCFC-22), 47% of 1,1,1,2-tetrafluoroethane (HFC-134a) and 49% of 1,1,1,2 , 3,3,3-heptafluoropropane (HFC-227ea) three substances are physically mixed in the liquid phase and then filled into the flooded evaporator unit; or 7% of chlorodifluoromethane (HCFC-22), 52 % of 1,1,1,2-tetrafluoroethane (HFC-134a) and 41% of 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) in the liquid phase After physical mixing, it is charged into the dry evaporator unit. Its environmental parameters, physical parameters and thermal performance are shown in Table 6.

Embodiment 3

[0053] Example 3: 1% of 1,1,1-trifluoroethane (HFC-143a), 52.5% of 1,1,1,2-tetrafluoroethane (HFC-134a) and 46.5% of 1, The three substances of 1,1,2,3,3,3-heptafluoropropane (HFC-227ea) are physically mixed in the liquid phase and then filled into the flooded evaporator unit; or 2% of 1,1,1-three Fluoroethane (HFC-143a), 58% of 1,1,1,2-tetrafluoroethane (HFC-134a) and 40% of 1,1,1,2,3,3,3-heptafluoropropane (HFC -227ea) The three substances are physically mixed in the liquid phase and then charged into the dry evaporator unit. Its environmental parameters, physical parameters and thermal performance are shown in Table 6.

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Abstract

The refrigerant consists of 1, 1, 1, 2-tetrafluoroethane, 1, 1, 1, 2, 3, 3, 3-heptafluoropropane and chlorobifluoromethane or 1, 1, 1-trifluoroethane. The present invention can meet the special requirement of centrifugal cooling water set on the substitute in molar mass, refrigerating amount unit volume, exhaust density of compressor and other parameters. The present invention makes the centrifugal chiller not only operate normally in designed work state but also adapt the load change. The present invention coincides with the requirement of protecting ozone layer and reducing green house effect. The refrigerant may be refilled directly and may be used as the substitute of available Freon-12 in centrifugal chiller.

Description

technical field [0001] The invention relates to a refrigerant, in particular to a refrigerant used in a centrifugal chiller to replace Freon-12 (CFC-12). Background technique [0002] Freon-12 has been widely used in refrigeration and air-conditioning systems and other fields for a long time because of its low toxicity, non-flammability, non-corrosion, and compatibility with other materials. However, since it was discovered in 1974 that Freon-12 has a serious destructive effect on the atmospheric ozone layer, it has attracted increasing attention from the international community, and it has been decided to gradually limit the production and use of Freon-12. Developed countries have banned the use of Freon-12 in 1996. Production and use, my country will also stop using Freon-12 on January 1, 2010. At present, as the refrigerant of centrifugal chillers, the use of Freon-12 still accounts for a considerable proportion. Before January 1, 2004, there were still 36,226 CFC (includ...

Claims

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Application Information

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