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With the uncertainties in the constants A and B determined, as before the propagation of error in the heat removal rate is calculated by: P 2 2 2 2 2 2 ∆Q = 1 ∂∆QP + 1 ∂∆QP + 1 ∂∆QP + 1 ∂∆QPout + 1 ∂Q Pin (C.3) ∆ Q ∆ Q ∂ m& m& ∆ Q ∂ A A ∆ Q ∂ B B ∆ Q ∂ T T ∆ Q ∂ T T out in To gage the relative importance of each term above, the relative contribution for each term in Equation C.3 is listed in Table C.2 for the R410A baseline rating condition results. From the results in Table C.2 it is evident that the error in the glycol calculation is almost entirely dependent on the uncertainty in the thermocouple readings, and that the contribution from the uncertainty in the calculated constants for specific heat is relatively minor. Table C.2 Relative contribution to overall error from each source for the R410A baseline rating condition (8.3oC outdoor/21.1oC indoor) Source Mass flow meter (Pm) Intercept of Spec Heat (PA) Slope of Spec Heat (PB) Temperature (PT,out & PT,in) Uncertainty ± 0.12% of reading ± 0.01 kJ/kg K ± 9.42 x 10-6 ± 0.1oC Contribution 0.31% 2.1% ----- 97.6% 68PDF Image | Comparison of R744 and R410A
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