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CHAPTER 3: HEA T PUIYfP Sllv1ULATION MODEL 65 In figures 3.7 and 3.8 a polynomial equation is fitted to the profiles attained from the plots made. The polynomial fitted through the mass flow resulted in a 3rd order polynomial equation describing the mass flow of the system in terms of evaporating pressure. The polynomial fitted through the compressor efficiency resulted in a 6th order polynomial equation describing the compressor efficiency in terms of the evaporating pressure. The R2-equation shows the accuracy of the equations obtained from the polynomials fitted through the plots, 1 being a good fit and 0 being a bad fit. The equations obtained are given below: The 3rd order polynomial equations describing the mass flow in terms of the evaporating pressure are as follow: • • y= 6.7164xlO-9x2 +4.372x10-5x- L0121x10-2 [3.6] [3.7] [3.8] [3.9] R2 9.9978xlO-1 y 6.5642x10-9 x2 +4.4975x10-5 x 1 = 9.9985x10- L167x10-2 y == 8.58x10-9 +3.0797x10-sx 8.1267x10--4 • • R2 = 9.99885xl0-1 y = 4.777x10-9x2 + 101x10-5x-9.8689x10-3 R2 9.9805xlO-1 The 6th order polynomial equations describing the compressor efficiency in terms of the evaporating pressure are given below: • • • • [3.10] [3.11 ] 21 - 2.0752xl0- X+1.2432xl0 [3.12} [3.13] All of the above fitted equations are reasonable fittings and can now be used to describe the system mass flow and compressor efficiency in terms of evaporating A Techno-Economical Analysis of a C02 Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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