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CHAPTER 3: fIEA T PUMP SIJvJ1JLATION MODEL 61 3.3 Characterization of Compressor This section uses the results obtained from the simulation above to characterize the compressor. Characterizing the compressor into only two [3.23,3.24] formulas both in terms of evaporation pressure and discharge pressure, enables the manipulation of the first cycle simulation so that results can be obtained for any evaporation temperature, gas cooler outlet temperature and discharge pressure. With all the variables known and from the compressor chart the following plots can be made; 1. evaporating capacity against evaporation temperature, 2. mass flow against evaporating pressure and 3. compressor efficiency against evaporating pressure. These plots are shown in Figures 3.6, 3.7 and 3.8 respectively and will discussed in more detail in the section to follow. All the variables used were attained from the results as shown in Table 3.2. Figure 3.6 shows cooling capacity against evaporation temperature in terms of the discharge pressure and the gas cooler outlet temperature. • Plot 1 is at a discharge pressure of 7500kPa temperature of 288K. • Plot 2 is at a discharge pressure of 7500kPa temperature of 298K. • Plot 3 is at a discharge pressure of 9000kPa temperature of 308K. • Plot 4 is at a discharge pressure varying between gas cooler outlet temperature of 313K. and a gas cooler outlet and a gas cooler outlet and a gas cooler outlet 11000 to 12000kPa and a Plot 4 is made up of varying pressures because of the compressor chart being used. This may have an affect on the accuracy of the plot but it is done at a constant gas cooler outlet temperature. Results found from the plots in table 3.2 depicts that the accuracy is still good enough. A Techno-Economical Analysis of a CO2 Heat Pump. School of Mechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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