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Bu et al. Geothermal Energy 2013, 1:2 www.geothermal-energy-journal.com/content/1/1/2 ηp 1⁄4Wnet ð5Þ Qboi pffiffiffiffiffiffiffiffiffiffiffi Tboi 1⁄4 ThTc ð6Þ WRm 1⁄4 Wnet 1⁄4 ðh2−h3sÞηexp−ðh1s−h4Þ ð7Þ Page 5 of 14 mp VFR 1⁄4 V3 ηpump;w V2 —pffiffiffiffiffiffi ð8Þ ð9Þ ð10Þ ð11Þ ð12Þ ð13Þ ð14Þ ð15Þ V3 SP1⁄4 pffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi 4 1; 000 ðh2−h3sÞ For VCC: Wcom 1⁄4Wexp Qeva 1⁄4 micðh6−h5Þ W 1⁄4m ðh7s−h6Þ com ic COPc 1⁄4 Qeva W com PR 1⁄4 P7 P6 ηcom CRPR 1⁄4 COPc PR The overall performance of ORC/VCC is defined as follows: COPs 1⁄4 ηpCOPc ð16Þ mN 1⁄4 Qeva ð17Þ CpðTN1−TN2Þ N 1⁄4 mN 1; 000 ð18Þ mh CPRmA 1⁄4 Qeva ð19Þ mp þ mic Results and discussions Considering the temperature difference of hot water from hot springs at different places and the temperature variation of coolant in different seasons and places, the temperature of hot water at the generator inlet, Th, is in the range of 70°C to 95°C, and the condensation temperature is respectively equal to 35°C, 40°C and 45°C. For the sake of simplification, the mass flow rate of the working fluid for ORC is 1 kg/s. The eva- poration temperature is 5°C and remains invariable, and the chilled water temperature at the evaporator inlet and outlet is, respectively, 14°C and 7°C. The isentropic effi- ciencies for the expander, compressor and working fluid pump are 0.85, 0.8 and 0.9, respectively.PDF Image | Performance analysis and working fluid selection for geothermal energy-powered organic Rankine-vapor compression air conditioning
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