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4. Concluding remarks Hanzhi Wang et al. / Energy Procedia 105 (2017) 1889 – 1894 1893 Fig. 5 Turbine size factor vs. turbine entry temperature The ORCs using HFE7000, HFE7100 and HFE7500 as working fluids are parametrically analyzed and compared on the basis of the thermodynamic efficiencies, net power output and turbine size factor. Under constant external conditions, a computer program in EES has been developed to calculate the thermodynamic performance of the three working fluids under various turbine entry temperatures. Based on the present analysis, it is found that (1) with the turbine entry temperature increasing, for all working fluids investigated, the thermodynamic efficiencies of the ORC increase, the turbine size factors decrease, and the net power output has peak values; (2) among the studied working fluids, HFE7000 performs better on the thermodynamic efficiencies and net power output; and (3) the smallest turbine size factor is occurred in the case of HFE7000, followed by HFE7100, and HFE7500 takes the largest turbine size factor. Hence, in general, it is a good choice to use HFE7000 as working fluid in ORC to convert low-grade heat into power. Acknowledgments This research was supported by the Natural Science Foundation of Guangdong Province, China (Grant Nos. 2016A030313174 and 2015A030313714), the Science and Technology Program of Guangzhou, China (Grant Nos. 201607010106 and 2014J2200079) and the Key Laboratory of Renewable Energy, Chinese Academy of Sciences (Grant Nos. Y607j11001 and y507j71001). References [1] Quoilin S, Lemort V. Technological and economical survey of organic Rankine cycle systems. In: Fifth European Conference on Economics and Management of Energy in Industry, Vilamoura, Portugal; 2009. [2] Yamamoto T, Furuhata T, Arai N, Mori K. Design and testing of the organic Rankine cycle. Energy 2001; 26: 239-51. [3] Mago PJ, Chamra LM, Srinivasan K, Somayaji C. An examination of regenerative organic Rankine cycles using dry fluids. Appl Therm Eng 2008; 28: 998-1007. [4] Wang EH, Zhang HG, Fan BY, Ouyang MG, Zhao Y, Mu QH. Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery. Energy 2011; 36: 3406-18. [5] Chys M, Van den Broek M, Vanslambrouck B, De Paepe M. Potential of zeotropic mixtures as working fluids in organic Rankine cycles. Energy 2012; 44: 623-32.PDF Image | Thermodynamic Analysis ORC Hydrofluoroethers working fluid
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