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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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temperature increases, the losses due to convection and radiation from the engine structure increase. For example, at 18 N-m and 3100 RPM (Figure 6-1) other losses increase from 6.11±2.79% to 14.12±2.44% of the fuel energy as the coolant temperature increased from 90°C to 150°C. However, this effect was found to be statistically significant only at 12 N-m and 18 N-m engine loads. The ‘other losses’ category was also effected by the head gasket leakage that increased significantly at the 175°C coolant temperature (Figure 6-1). There is a negative correlation between other losses and the HTF leakage rates, with the other losses decreasing when the leakage increased at 175°C. However, the other losses were not directly measured, but rather derived by subtracting all measured energy flow exiting the engine from the measured fuel energy input. Therefore, the introduction of unmetered fuel into the combustion chamber resulted in both the fuel input and the other losses being underestimated. If the unmetered fuel had been measured, it is unlikely that the other losses would have been found to decrease. It should also be noted that the other losses category has a large uncertainty compared to the fractions for coolant heat and other directly measured values. The relative uncertainty for the other losses ranged from 13.41% to 52.42% and, therefore, observed changes in the other losses category could be a result of measurement uncertainty instead of actual changes in the engine operation. During the tests, the following exhaust emissions were monitored: THC, O2, CO, CO2, and NOx. The exhaust gas compositions were measured using a 5-gas analyzer, and representative results vs. coolant temperature are shown in Figure 6-6 (3100 rpm and 18 N-m). THC were 60-75 ppm for coolant temperatures between 90°C and 150°C. THC emissions increased at higher temperatures, reaching a maximum of 132.7 ppm at 200°C. THC concentration did increase between the 150°C and 175°C coolant temperature tests, though the concentration only partially follows the rate of leakage of HTF into the combustion chamber through the entire range of tests. 144

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