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CHAPTER 3: PUMP SllvfULATION MODEL 80 Figure 3.24 shows the T-s diagram for a discharge pressure of 9000kPa, water inlet temperature of 30 degrees and gas cooler outlet temperature of 308K and evaporating temperature of 273K. From this it could be seen that in the centre of the gas cooler temperature glide the water profile gets very close to the temperature glide within the gas cooler. From the literature it is known that the delta temperature between the refrigerant and medium could be as close as 2K, but this is for a highly efficient gas cooler and can potentially cause problems in practice. Therefore one of the reasons that lead to 1OOOOkPa to be the preferred discharge pressure at which to operate is because the delta temperature between the medium and refrigerant is much more likely in practice at a discharge pressure of 10000kPa. From the simulations made to attain Figures 3.18 to 3.23 the heating capacity, COP and power was determined. These results were compared with each other and are shown in Table Table 3.7: Comparison of COP, Q_h and P at different T_ev, T_wi, T_gc and discharge pressures. . 15.83 I 15.12 17.87 65.81 17.87 60.16 17.87 53.5 17.58 75.29 17.58 68.44 T_ev 5 (278) 10 (283) 10 20 30 10 20 30 10 10 2 20 20 298 30 30 308 P_dis 9000 10000 Twi T Twi 11000 wi Tc 10 288 10 0(273) 20 30 308 298 Table 3.7 cont.: Comparison of COP, Q_h and P at different T_ev, T_wi, T_gc and discharge pressures. 9000 P QhCOPP 14.11 59.46 4.013 15.87 14.82 53.63 3.62 15.87 14.82 45.45 3.068 15.87 69.9 4.416 17.05 15.83 62.81 3.968 17.05 15.83 52.84 3.338 17.05 80.34 5.313 16.53 15.12 71.72 4.743 16.53 15.12 59.61 3.942 16.53 P dis 10000 11000 QhCOP~P QhCOP 58.25 3.67 56.43 3.361 2.758 3.682 3.366 2.993 4.282 3.892 3.433 A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West University 288 10 20 298 20 30 308 30 10 288 10 20 298 20 30 308 30 288 298 308 288 298 308 • 53.04 3.342 46.54 2.932 16.79 46.3 68.49 4.016 62.14 3.644 54.2 3.178 78.71 4.763 70.98 4.294 61.32 3.71 17.58 60.37 51.78 3.084PDF Image | CO2 HEAT PUMP Analysis
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