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CHAPTER3:HEAT PUM.P SIMULATIONMODEL 62 Figure 3.6: Cooling capacity against evaporation pressure. 70 60 §: ~40+ • l a 30 ... --'T'" ,...................~~ ·T '············· O+-------~------+-------r-------r_------+_------r_----~ 250 255 260 265 270 275 280 285 From figure 3.6 it could be seen that as the gas cooler outlet temperature increases there is a loss in the evaporating capacity because less heat is rejected in the gas cooler which affects the amount of heat to be absorbed in the evaporator. It is also clear that as the evaporating temperature increases, the cooling capacity increases because there is a lot more energy in the surrounding medium to be extracted. The evaporating temperature is directly linked to the ambient wet bulb temperature since the cycle simulated consists of an air to refrigerant evaporator. Therefore from figure 3.8 it can be clearly seen that a better system performance will be attained at high wet bulb ambient temperatures and a low gas cooler outlet temperature which is directly linked to the water inlet temperature because the system simulated consists of a refrigerant to water gas cooler. This is because the warmer the ambient temperature the more heat there is for the refrigerant to extract from the ambient air. For the gas cooler, the lower the water inlet temperature is the more heat could be rejected into water. These both lead to a highly efficient system with a good COP. Figure 3.7 shows the mass flow against evaporation pressure in terms of the discharge pressure and the gas cooler outlet temperature. A Techno-Economical Aoalysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West UniversityPDF 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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