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CHAPTER 3: HEAT PUMP SIMULATIONMoDEL 84 because the simulations that will be done to compare the CO2 system with the R-22 system will be in terms of the water inlet temperature and the gas cooler outlet temperature should react to the inlet water temperature's value. Therefore the delta temperature implemented will ensure that the gas cooler outlet temperature is always higher than the water inlet temperature. For the evaporating temperature it was decided that the evaporation temperature will be 7K lower than the ambient wet bulb temperature. This is an assumption which in practice has shown to be more or less accurate. The delta temperature is implemented because the simulations that will be done to compare the CO2 system with the R-22 system will be in terms of the evaporation temperature. The delta implemented will ensure that the system is run at an evaporating temperature of 7K lower than the wet bulb temperature which is known. The simulations are done within a wider spectrum of running conditions. It is done for evaporating temperatures of 0, 5 and 10K respectively with the delta temperature between the evaporating temperature and ambient wet bulb temperature implemented in the EES program (given in Appendix A). The water inlet temperature is varied from 278 to 303K as shown in Table 3.8. The delta temperature between the inlet water temperature and gas cooler outlet temperature is implemented in the EES program as sh0-vv:n in Appendix A.. The results are shown in Table 3.8. Table 3.8: Results for a discharge pressure of 1OOOOkPa with varying evaporating temperatures and gas cooler outlet tern peratures. 10000 kPa P COP 278 283 50.87 14.18 -5 (268) 288 14.18 14.18 14.18 14.18 --~----~-+---- ----------------~ 278 15.87 283 15.87 15.87 293 15.87 298 15.87 303 15.87 A Techno-Economical Analysis of a CO2 Heat Pump. School of Mechanical Engineering, North-West University 0(273) 288 283 14.18 3.451 3.307 3.151 2.978 2.776 i 3.819 3.67 3.512 3.342 3.153 2.932 3.588PDF Image | CO2 HEAT PUMP Analysis
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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