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CHAPTER3:HEAT PUtv1P SIMULATIONMODEL 76 the evaporation temperature cannot exceed the gas cooler outlet temperature this also has to be kept in mind. The following section is to determine at which discharge pressure the system will operate at its best for certain evaporating and gas cooler outlet temperatures. A water temperature gradient was built into the EES simulation which is given in Appendix A. The gradient was made for a certain inlet water temperature and a fixed outlet water temperature of 60 ac. From this we could see whether or not the water profile fits with the temperature slope in the gas cooler. The simulations were done with the gas cooler temperatures and evaporating temperatures as given in the compressor chart. The simulations were done for discharge pressures of 8000,9000,10000 and 11OOOkPa respectively. The following is the comparison between the results at different discharge pressures. The average COP, heating capacity and compressor efficiency was used to compare the system at different types of discharge pressures. This is given in Table 3.6. Table 3.6: Average COP, heating capacity and compressor efficiency at different discharge pressures. P dis 8000 ·9000 10000 11000 Avg COP 3.3 3.320 3.100 2.800 Avg Q h 40.9 45.3 45.5 43.99 Avg eta c 0.63 0.63 0.63 0.61 From T able 3.6 it could be seen that the average values does not differ that much. A t 8000kPa and 11 OOOkPa they start to deviate from the results found in the simulations done at 9000 and 10000kPa, this could be because they are close to the boundaries from which the polynomials were derived. At 9000 and 10000kPa the results are satisfactory, the average COP being very good and the average heating capacity being what is needed to compare it to the R-22 system later on. Thus it could be seen that for discharge pressures of 9000 and 10000kPa the system results are satisfactory. The water temperature gradient should not exceed the gas cooler gradient and the water inlet should also not be higher than the gas cooler outlet temperature. Therefore a discharge pressure and gas cooler outlet temperature should be chosen A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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