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Appendix 2 : First series of tests Test Refrigerant flow rate [kg/s] 061013A 0.073 061017A 0.074 061020A 0.065 061020B 0.064 061024A 0.064 061024B 0.064 061025A 0.064 061025B 0.064 061027A 0.063 061027B 0.061 061031A 0.066 061031B 0.067 061031C 0.068 Refrigerant temperature Test at the expander supply [°C] 061013A 121.7 061017A 118.4 061020A 131.7 061020B 114.1 061024A 130.1 061024B 113.5 061025A 131.5 061025B 115.1 061027A 131.9 061027B 115.8 061031A 132 061031B 131.8 061031C 132.4 Air flow rate [kg/s] 0.093 0.093 0.092 0.092 0.092 0.092 0.092 0.091 0.091 0.091 0.096 0.095 0.096 Refrigerant pressure at the expander supply [°C] Water flow rate in the condenser [kg/s] 0.587 0.592 0.588 0.412 0.586 0.411 0.589 0.414 0.327 0.208 0.255 0.252 0.249 Pump setting 0.8 0.8 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.8 0.85 0.9 Cold source temperature [°C] 14.78 14.7 14.37 14.37 14.38 14.34 14.32 14.28 14.54 14.45 14.4 14.38 14.36 Expander isentropic effectiveness 0.583 0.580 0.558 0.537 0.564 0.539 0.591 0.557 0.575 0.530 0.619 0.616 0.610 Second hot air source temperature [°C] 155.1 154.6 158.2 138.2 156.6 136.9 157.1 137 156.1 135.2 159.2 159.9 160.4 Cycle efficiency 0.049 0.048 0.045 0.040 0.045 0.041 0.051 0.048 0.048 0.042 0.053 0.054 0.053 First hot air source temperature [°C] 185 184.5 187.8 176.5 186.2 176.9 187.2 178.3 188.5 178.6 185.9 187.7 188 Carnot efficiency 0.328 0.327 0.334 0.301 0.331 0.299 0.332 0.299 0.330 0.296 0.335 0.336 0.337 Subcooling at the condenser exhaust [K] -18.06 -17.72 -22.02 -19.43 -20.09 -20.1 -22.34 -21.52 -20.99 -20.82 -15.83 -16.72 -16.08 Exergetic efficiency 0.151 0.148 0.134 0.134 0.135 0.137 0.153 0.161 0.146 0.141 0.159 0.160 0.157 Superheating at the evaporator exhaust [K] 20.08 17.04 34.3 18.58 32.9 17.91 34 19.65 34.39 21 32.32 31.26 31.64 Pressure ratio over the expander 3.63 3.62 3.36 3.21 3.34 3.21 3.5 3.5 3.48 3.27 3.68 3.76 3.77 835615 1025 827503 1010 761584 729325 757731 728960 763748 727003 764184 717174 800923 1034 817999 1067 819594 1066 Shaft output Asynchronous power [W] machine output power [W] 686 668.9 530.2 410.8 522.9 418.9 601.1 502.8 575.6 428.7 706.9 758.1 742.4 856.6 733.4 850.8 736.5 932.8 826.4 886.5 710.7 127PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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