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Performance Analysis of Transcritical Organic Rankine-Vapor Compression Refrigiration System Powered by Medium-Grade Geothermal Energy
Received date: 2014-03-27
Revised date: 2014-06-19
Online published: 2014-06-30
The transcritical Organic Rankine-Vapor Compression refrigeration system can make working fluid well match geothermal fluid, benefit for reducing the irreversibility of the system. A thermodynamical model is set up to analyze the performance of the system selecting R143a, R218 and R125 as working fluid respectively. The calculation is conducted by the EES program. The results show that R143a is the most appropriate working fluid for the system compared with R218 and R125. To avoid wet vapor in the expander, the expander inlet has a limited pressure in a constant temperature. Moreover, there exists an optimum pressure for the system performance. A higher geothermal fluid temperature can improve the refrigerating capacity. However, the system performance coefficient may firstly increases and then decreases with geothermal fluid temperature increasing. As the geothermal fluid dryness increases, the higher system refrigerating capacity can be obtained, which results from the release of large amounts of latent heat, while, the system performance coefficient remains unchanged. The condensation and evaporation temperature have great effects on the system performance. Compared with evaporation temperature, condensation temperature has a more significant effect. The optimum performance of transcritical Organic Rankine-Vapor Compression refrigeration system using R143a as working fluid is better than that of subcritical Organic Rankine-Vapor Compression refrigeration system using R245fa as working fluid.
CAO Yuan-shu , HU Bin , LIANG Li-peng , BU Xian-biao , MA Wei-bin . Performance Analysis of Transcritical Organic Rankine-Vapor Compression Refrigiration System Powered by Medium-Grade Geothermal Energy[J]. Advances in New and Renewable Energy, 2014 , 2(3) : 204 -210 . DOI: 10.3969/j.issn.2095-560X.2014.03.006
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