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CHAPTER3:FIEAT PU1v1P SIivruLATIONMODEL 66 pressure for any given circumstance, 'x' being the common denominator for the evaporating pressure. Because we want the mass flow and the compressor efficiency to be in terms of both evaporating pressure and discharge pressure and not only evaporating pressure, the above attained equations must be plotted against the discharge pressure in order to attain the required equations. The coefficients from the equation attained are plotted against the discharge pressures given in the compressor chart. The coefficients from the equation describing the mass flow in terms of evaporating pressure is plotted against the corresponding discharge pressure as shown in table 3.3. Table 3.3: Coefficients from mass flow equation against the suitable discharge pressure. -1.17E-02 9000 -8.13E-04 12000 -9.87E-03 4.50E-05 3.08E-05 3.51 E-05 aO 6.72E-09 6.56E-09 8.58E-09 4.78E-09 The following plots are made according to table 3.3. The plots are shown in figures 3.9, 3.10 and 3.11. Figure 3.9: Coefficients a2 against discharge pressure. A Techno-Economical Analysis of a CO, Heat Pump. School of Mechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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