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Bu et al. Geothermal Energy 2013, 1:2 www.geothermal-energy-journal.com/content/1/1/2 Page 10 of 14 36 30 24 18 12 70 75 80 85 90 95 R123 R134a R245fa R600a R600 R290 Figure 6 Effect of Th on COPs. Th (OC) The effect of Th on CPRmA is shown in Figure 7. CPRmA is defined as the ratio of Qeva to (mp + mic), which reflects the refrigerating capacity of the working fluid per unit mass flow rate. As evident in Figure 7, CPRmA increases with Th for all working fluids. R600 and R600a have the highest and second highest CPRmA. CPRmA for HCs is higher than those for R123, R134a and R245fa. So, HCs of R290, R600 and R600a are more suitable working fluids for ORC/VCC compared with working fluids R123, R134a and R245fa. N as a function of Th is plotted and presented in Figure 8. Figure 8 shows that N de- pends largely on Th and it increases with Th for all working fluids. R134a has the highest N and R290 has the lowest N for all heat source temperatures. Except R134a 100 75 50 25 70 75 80 85 90 95 Th (OC) R123 R134a R245fa R600a R600 R290 Figure 7 Effect of Th on CPRmA. CPRmA (kW.s/kg) COPs (%)PDF Image | Performance analysis and working fluid selection for geothermal energy-powered organic Rankine-vapor compression air conditioning
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