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CHAPTER3:HEAT Pu:tv1P SIMULATIONMODEL 79 --------_ .. - .....~ --------------- From Figures 3.18 to 3.23 the effect of the gas cooler outlet temperature on the T-s diagram of the CO2 cycle could be seen. We know that the gas cooler outlet temperature cannot be lower than the water inlet temperature and the reason for this can be seen in Figures 3.18 to 3.23. Where if the water inlet temperature is higher than the gas cooler outlet temperature, the two profiles (refrigerant temperature and water temperature profile) will cross and that is impossible in practice. Because the refrigerant cools down with a temperature glide in the gas cooler, it was also a concern whether or not the water profile will cross the refrigerant profile as the refrigerant cools down in a glide. It could be seen that as long as the water inlet temperature is kept lower than the gas cooler outlet temperature that these two profiles won't cross each other. This could be a problem for lower discharge pressures since the refrigerant also cools down with a temperature glide but at a constant pressure. Therefore from Figures 3.18 to 3.23 it could be seen that as the water inlet temperature rises the gas cooler temperature will have to rise as well. This corresponds with what was found in the literature and this is the reason why the water inlet temperature is directly linked to the system's performance. If the water inlet temperature rises the gas cooler temperature will have to rise causing the heat that is available to be extracted from the ambient air to be less and this decreases the system's cooling capacity which decreases the systems heating capacity and therefore results in a less efficient system. Figure 3.24: T-s diagram: T_wi = 30°C; T_gc = 308K and P_dis = 9000kPa. A Techno-Economical Analysis of a COl Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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