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Mgi Tegi Tego 35701200rpm.xls 745.5 4.38 10.73 47701096rpm.xls 746.9 4.94 11.41 Heat Bal II (12/6) 366.8 4.56 11.08 8313 7904 409 4.92% 366.8 4.56 11.08 7642 7904 -262 47701200rpm.xls 749.5 5.29 11.81 Heat Bal I (12/12) 368.2 2.2 9.6 62701200rpm.xls 752.5 5.29 11.81 Heat Bal II (12/12) 368.6 2.17 9.6 Table C.1 Summary of energy balance results Original Heat Pump Tests: 17701112rpm.xls 730 1.775 7.827 17701200rpm.xls 734 2.54 8.699 Heat Bal I (11/30) Mgi 258.2 288.6 368.6 Tegi 11.67 12.72 5.273 Tego 15.61 15.85 11.55 With Revised Cp Values for Glycol: A=3.1618, B=0.003967 Mgi 258.2 288.6 368.6 Tegi 11.67 12.72 5.273 Tego 15.61 15.85 11.55 Calculated with A=3.45, B=0.002956 3546 3161 3434 3052 112 109 9439 9432 8905 8882 534 550 Qglycol (W) We-Qetr (W) Difference (W) Diff/Qglycol 3.16% 3.45% 5.39% Qglycol (W) We-Qetr (W) Difference (W) Diff/Qglycol 3267 2914 3434 3052 -167 -138 -5.11% -4.74% 7388 7602 -214 -2.90% -3.43% -2.71% -2.52% Heat Bal II (11/30) Heat Bal I (12/6) 8035 7602 433 The first set of results is the energy balance calculated using the same constant values for the determination of the specific heat as were used in the R410A data. Following the tests, the concentration of the glycol was determined by measuring the specific gravity of the solution with a hydrometer and the constants for the specific heat calculation were recalculated based on those results, summarized in Table C.1. The second set of results presents the energy balance using the revised constants for the specific heat. The data shows a large shift (approx. 0.8 kW at high flow rates) in the calculated energy removal rate of the glycol based on the revised values for The specific heat. This reduces the calculated amount of heat that is removed by the glycol. In the original R410A data, this would bring the capacity results from the glycol energy balance more in line with the capacity calculated by other methods. At higher flow rates and lower inlet/outlet temperatures, the difference between the heat input and removal to the system is smaller (as a percentage) than at the lower flow rates—a switch from the results calculated using the original constants for the glycol specific heat calculation. C.3 Error analysis: For the baseline R410A data from the Carrier system, the calculated precision of the chamber calorimeter balance was calculated to be ± 470 W, determined as follows. The theoretical uncertainty in the specific heat is based on the uncertainty in the concentration. The uncertainty in the concentration (C) is a function of the uncertainty in the temperature (T) and density (ρ) measurements and can be estimated can be estimated from (Coleman et al., 1989): P 2 1 ∂C 2 1 ∂C 2 C = P + P C C∂TT C∂ρρ (C.2) 65 5.66% 368.2 2.2 2.17 9.6 9.6 8670 8664 8905 8882 -235 -218 5.83% 368.6PDF Image | Comparison of R744 and R410A
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