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CRt\l'TER 3: PU1vIP SIMULATION MODEL 81 Table 3.7 gives a very good indication of how the system is affected by the evaporating temperature, water inlet temperature, gas cooler outlet temperature and discharge pressure. It could be clearly seen that as the water inlet temperature increases the gas cooler outlet temperature has to increases as well and this causes a decrease in the COP of the system and the heating capacity available. This was predicted and can now be seen from the data that was found. For a higher discharge pressure the COP decreases, this is because the power that is needed to reach the higher discharge pressure increases and therefore reduces the system's COP. On the other hand as the discharge pressure increases so. does the heating capacity, this is because more energy is put into the system to reach the higher discharge pressure. Figures 3.25 and 3.26 show the pressure enthalpy diagram for the CO2 system. Both are done at an evaporating temperature of 283K and a discharge pressure of 10000kPa. The gas cooler outlet temperature is changed from 288 to 308K and the drastic change in the P-h diagram can be seen. The reduction in heating capacity could be clearly seen from the figures as the gas cooler outlet temperature increases. The effect of the added superheat could also be seen from the figures. Figure 3.25: P-h diagram: T_ev = 283K; T_gc =288K and P_dis =10000kPa. A Techno-Economical Analysis of a COl Heat Pump. School of Mechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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