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Exergy Analysis of Transcritical Organic Rankine-Vapor Compression Refrigiration System Powered by Medium-grade Geothermal Energy
Received date: 2014-09-22
Revised date: 2014-10-19
Online published: 2014-12-30
A thermodynamic exergy analysis model of the transcritical Organic Rankine-Vapor Compression refrigeration system powered by medium-grade geothermal energy is set up. R143a is selected as working fluid. The influence rules of expander inlet pressure, geothermal fluid inlet temperature, condensing temperature and evaporating temperature on the exergy efficiency are studied. What’s more, each component exergy loss of the system is analyzed. The calculation results showed that reasonable expander inlet pressure should be less than 1.8 times the critical pressure. There exists an optimal geothermal fluid inlet temperature for exergy efficiency. A lower condensing temperature and higher evaporating temperature could improve exergy efficiency, which need more equivalent heat transfer area. The absolute exergy loss of condenser, generator, expander and throttle valve, compressor, evaporator decrease in turn. As the geothermal fluid inlet temperature increases, exergy loss ratio of condenser and generator increases, while that of the other parts decrease. This work could provide references for the design of transcritical Organic Rankine-Vapor Compression refrigeration system.
CAO Yuan-shu , SUN Xue-meng , MA Zhi-tong , MA Wei-bin . Exergy Analysis of Transcritical Organic Rankine-Vapor Compression Refrigiration System Powered by Medium-grade Geothermal Energy[J]. Advances in New and Renewable Energy, 2014 , 2(6) : 441 -448 . DOI: 10.3969/j.issn.2095-560X.2014.06.006
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