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CHAPTER3:HEAT PUM:P SnvIULATIONMoDEL 59 • The enthalpy and entropy of the refrigerant leaving the gas cooler can be calculated in terms of the gas cooler outlet temperature and the discharge pressure. • The cycle is completed and all the variables required were calculated. The important variables calculated in the cycle simulation mentioned above are the COP, heating capacity, mass flow and compressor efficiency of the cycle. The results are given in table 3.2 for the conditions in table 3.1. The average heating COP obtained from the results is 3.3, which is in accordance with the literature and with what is expected from a heat pump system. As expected it can be seen that the COP is higher for a higher evaporating temperature, lower for a higher gas cooler outlet temperature and lower for a higher discharge pressure. This corresponds well with what was found in the literature. The average heating capacity obtained from the results is 46kW, which is about the same as that of the R-22 heat pump system it will be compared to later. The average compressor efficiency obtained from the results is 63%. P suc i (kPa) P_dis (kPa) 7500 7500 T_ev (K) 253 253 253 253 258 258 258 258 263 263 263 263 273 273 273 273 273 273 278 278 278 278 Tgc_o ut (K) 288 298 308 313 288 298 308 313 288 298 308 313 288 298 308 288 i 298 313 288 i 298 308 288 mass flow Q{kW) P(kW) I COP i Qh 28.36 25.3 20.39 17.39 eta_c 0.6526 0.6565 0.6498 0.551 ! 1972 1972 1972 1972 0.1016 21.9 9.9 0.1022 18.8 9.9 0.09068 13.7 10.3 0.07467 11 11.6 0.1252 27 I 10.4 2.865 2.555 1.98 1.499 i ! 2293 I 7500 3.261 33.91 0.6645 L~293 2293 2293 ~2650 • 2650 ! 2650 2650 3486 3486 3486 ! 7500I i 9000 0.1255 23.1 0.1164 17.6 0.09832 14.5 0.1545 33.3 0.155 28.5 0.1443 21.8 0.12 18.4 0.2241 47.9 0.2251 41 0.2103 31.4 0.2046 44.5 0.2045 39.1 0.1681 25.5 0.2672 56.7 0.2686 48.5 0.2525 37.3 0.2313 50.4 10.4 11.2 12.8 10.5 10.5 11.7 15.3 12.2 12.2 14.1 14.9 14.9 16.5 12.4 12.4 14.9 17.4 2.887 2.248 1.72 3.869 i 3.414 2.565 1.773 i 4.535 3.972 2.852 i 3.635 3.272 2.123 i 5.149 4.491 3.099 ! 3.552 30.03 0.6662 25.17 0.6762 • 22.02 0.5873 I 40.62 0.6973 35.84 0.6994 30.01 I 0.7018 27.13 0.5708 55.33 0.6088 48.46 0.6115 40.22 0.6255 i ! 54.16 0.6483 48.75 0.648 35.03 0.5776 63.85 0.5764 55.68 0.5794 46.18 0.5961 i 9000 11000 ! 11000 7500 7500 9000 12000 7500 7500 9000 3486 i 10000 i 3486 3486 3969 3969 3969 3969 10000 12000 I 7500 I 7500 9000 12000 i ...- - . • A Teclmo-Econonllcal Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West University Table 3.2: Results for the cycle simulation. 61.81 0.6558PDF Image | CO2 HEAT PUMP Analysis
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