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6.00E-17 4.00E-17 2.00E-17 O.OOE+OO -2.00E-i7 -4.00E-i7 -S.OOE-i7 -S.OOE-17 -i.OOE-i6 • • • • • • y =-8.3963x10-7x2 +8.0456x10-3X +8.032 R2 = 9.9977x10-1 [3.17] . [3.18] [3.19] [3.20] [3.21] [3.22] 3: HEAT PUMP SIMULATION MODEL 71 Figure 3.17: Coefficients aO against discharge pressure. A polynomial equation is fitted through the different plots with R2-equation showing the accuracy of the plot. The polynomial equation resulted in 3rd order polynomial equations taking the discharge pressure into consideration as well. The 3rd order polynomials taking the discharge pressure into account are given below: y =1.4441x10-9 x2 -1.4157X 1O-5x R2 =9.9979x10-1 1.0314x10-2 y -9.6578x10-13x2 +9.6283x10-9x+5.673x10-6 R2 = 9.998x10-1 y 3.1092x10-16x2 -3.1142x10-12x-1.7696x10-9 R2 = 9.9981x10-1 y -4.8268 x 10-20 X 2 + 4.8032x 1016 x+ 3.1525 x 10-13 R2 = 9.9982x10-1 y =2.899x10-24X 2 2.8348xl0-20 x-2.4274x10-17 R2 = 9.9982x10-1 A Techno-Economical Analysis ofa CO2 HeatPump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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