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test run. Three engine speeds were chosen between the idle speed of 1200 rpm and the maximum engine speed of 3600 rpm. For each engine speed, the engine was subject to a load requiring engine torque of 12, 15, 18, 21, and 24 N-m. Since power output is the product of torque and speed, the result was 15 different load points between 3.48 kW and 8.43 kW (34-81% of maximum load). The 15 load points were repeated for six engine coolant temperature set points from 90°C up to 200°C, with the inlet and outlet temperatures at the engine set to approximately 5°C below and 5°C above the target value, respectively. Therefore, the average coolant temperature inside the engine block was extremely close to the target temperature, except for the 12, 15, and 18 N-m data points at 2800 rpm and 90°C coolant temperature. For these data points, the outlet coolant temperature was set near the target temperature and the inlet temperature was much lower. The average coolant temperature for these three data points was between 75°C and 80°C. Also, note that tests were limited to 3100 rpm above 150°C coolant temperature due to issues with excessive driveline vibration. The testing began with the 90°C coolant temperature test points and proceeded by incrementally increasing the coolant temperature after all points shown in the text matrix for the given temperature were completed. Tests were typically run in order of lowest engine speed up to highest, with torque increasing or decreasing to minimize adjustments. For example, the first test point would be for 90°C, 2800 rpm, and 12 N-m of torque. The torque would then be increased to 15, 18, 21, and 24 N-m before increasing the engine speed to 3100 rpm. The 3100 rpm points would be run with decreasing engine torque from 24 N-m back down to 12 N-m. Before testing began, and in between each temperature, the engine compression was checked and recorded, and the engine oil was sampled and sent out for analysis for oxidation levels and metal particle content. The cylinder compression was checked in the following manner. With 51PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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