WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE

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WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE ( waste-heat-recovery-from-high-temperature-diesel-engine )

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ures  0.5r (A.4) 3 For the dynamometer, the standard uncertainty is a combination of the uncertainty in the length of the calibration arm (0.002 m), and the uncertainty of the calibration weights (0.002 kg). The uncertainty in the calibration weights is propagated through the force calculation which results in an uncertainty of 0.02 N. The force uncertainty is an order of magnitude larger than the length uncertainty, so the total systematic uncertainty is essentially 0.02 N-m after summing in quadrature. With 4 degrees of freedom, the SEE is found to be 0.278 and the coverage factor for a 95% confidence interval is 2.57, giving a combined systematic uncertainty of 0.714 N-m. The uncertainty due to the resolution of the dynamometer readout is 0.289 N-m, giving a total systematic uncertainty of 0.770 N-m. Table A-1. Summary of dynamometer calibration results. Slope (m) Intercept (b) Sum Exp. Error (SEE) Count [-] Deg. Of Freedom [-] Coverage Factor Uncertainty of Standard [N-m] Systematic Uncertainty [N-m] Display Resolution Uncertainty [N-m] Total Uncertainty [N-m] A.3 Thermocouples 0.962 0.165 0.278 6 4 2.57 0.002 0.714 0.289 0.770 A total of 14 thermocouples were calibrated to reduce systematic uncertainty in key temperature measurements. The calibrations were performed over the relevant temperature ranges expected during testing (25-200°C). To reach sufficienct temperatures and maintain uniformity, a hot stir plate was filled with Duratherm G HTF and insulated to serve as a calibration bath. The thermocouple readings were compared with a Platinum Resistance Temperature Detector (RTD) 196

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