Mixed working medium for organic working medium rankine cycle system of screw expander

A technology of screw expander and mixed working medium, which is applied in the field of heat pump circulating working medium and refrigeration, which can solve the problems of high risk, flammability and explosion, etc., and achieve improved heat transfer, high cycle heat utilization rate and excellent cycle performance Effect

Inactive Publication Date: 2011-07-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although alkanes have good cycle thermal performance, they are extremely flammable

Method used

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  • Mixed working medium for organic working medium rankine cycle system of screw expander
  • Mixed working medium for organic working medium rankine cycle system of screw expander
  • Mixed working medium for organic working medium rankine cycle system of screw expander

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Experimental program
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Effect test

preparation example Construction

[0039] The preparation method of the above-mentioned mixed working medium is to physically mix the component substances according to the set mass ratio at normal temperature.

[0040] Specific examples are as follows:

example 1

[0042] Take 82.5% HCFC-123 and 17.5% HFC-152a, mix them physically at room temperature and use them as circulating working fluid.

example 2

[0044] 65.5% HCFC-123 and 34.5% HFC-245fa are used as circulating working fluid after physical mixing at room temperature.

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PUM

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Abstract

The invention discloses a mixed working medium for an organic working medium rankine cycle system of a screw expander. The mixed working medium consists of two or three of four organic working media, namely HCFC(hydrochlorofluorocarbon)-123 (2,2-dichloro-1,1,1-trifluoroethane), HFC(hydro-fluoro-carbon)-245fa (1,1,1,3,3-pentafluoropropane), HFC-152a (1,1-difluoroethane) and HFC-134a (1,1,1,2-tetrafluoroethane). The sum of mass percentage of components of each mixed working medium is 100 percent. The preparation method for the mixed working medium comprises the following step of: physically mixing the components in the set mass ratio at normal temperature. The mixed working medium meets environmental protection requirement, namely has the ozone depletion potential (ODP) of zero, low global warming potential (GWP), suitable thermal parameters, good cycle performance and high cycle heat utilization rate.

Description

technical field [0001] The invention relates to a refrigeration and heat pump cycle working medium. In particular, it relates to a mixed working medium used in an organic working medium Rankine cycle system of a screw expander with an evaporation temperature of 60-130°C. Background technique [0002] Nowadays, the issue of energy saving and emission reduction has attracted more and more attention from all walks of life, and various energy-saving new technologies and equipment have emerged continuously. However, low-temperature waste heat power generation technology is not yet mature enough, because for low-temperature ) waste heat heat source, cannot use conventional power generation technology to generate electricity. The organic working fluid circulation screw expander system just makes up for this deficiency. This system can be used for low-temperature waste heat recovery, which can generate electricity or be used as a driving force to drive pumps and fans. In addition...

Claims

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Application Information

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IPC IPC(8): C09K5/04
Inventor 李惟毅谈西锋
Owner TIANJIN UNIV
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