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CHAPTER3:HEAT PUtvrP SIMULATIONMODEL 75 From the results found in table 3.5 the following conclusions could be made. The error for the determination of the suction pressure is on average less than 1% which indicates a very good correlation. Because of the way that the compressor chart is put together, seeing that not all of the pressures are kept constant throughout the DORIN simulation, the pressures implemented into the equations could not be constant throughout the correlation. Values in the original compressor chart are given for a constant pressure of 7500 and 9000kPa throughout the compressor chart but with higher pressures it varies between 10000, 11000 and 12000kPa. To get a plot for all the given evaporating temperatures a plot had to be prepared which consisted of both pressures - 11OOOkPa at a lower evaporating temperature and 12000kPa for a higher evaporating temperature. This could be determined from the errors displayed in table 3.5. The purpose of the polynomial equations determined earlier is to interpolate between given pressures. Therefore, for pressures at 7500 and 9000kPa the errors are small, not exceeding 5%, this is because these values are well within the boundaries and the equations have been correlated from a plot that used these pressures for all evaporating temperatures. A more significant error is seen for pressures 11000 and 12000kPa, this is because of the fact that one plot had to be made containing both pressures for certain evaporating temperatures. These values are still considered acceptable reaching only a 20~o, error at mos~. The most positive result found from the correlation is the error for the correlations at 10000kPa. There are only two results found for 10000kPa in the compressor chart initially given and therefore they were not implemented into the determination of the polynomial equations. The errors at a pressure of 10000kPa do not exceed 5%. This is satisfactory because this is exactly what is expected from the polynomial equations, to determine the values needed at any given discharge pressure, evaporating temperature and gas cooler outlet temperature. From the above results we can now determine the unknown variables for any evaporating temperature, gas cooler outlet temperature and discharge pressure keeping in mind that we should stay within the boundaries of the determined polynomials. From the literature it was found that best performance of a CO2 system was for discharge pressures between 8000 and 11000kPa. Knowing that the gas cooler outlet temperature depends on the water inlet temperature and knowing that 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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