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fabricated to provide sufficient control and facilitate measurement of fluid temperature and flow rates. Exhaust heat losses were found using the measured exhaust temperature and the combined air and fuel flow measurements. Emissions were recorded using a five-gas analyzer to measure the levels of O2, CO2, CO, THC, and NOx present in the exhaust gases. An eddy current dynamometer provided engine load and power measurements. The engine was operated at three different engine speeds (2800, 3100, and 3400 rpm) and five different torque levels (12, 15, 18, 21, and 24 N-m), providing fifteen unique load points. The results of the experiment showed that total waste heat exergy increased between 20% and 40% (depending on load condition) between the 90°C baseline coolant temperature and the 200°C coolant temperature. The rise in exergy suggested that substantial increases in WHR system output are possible when engine coolant temperature is increased. Thermodynamic models were then created for eight different WHR systems with coolant temperatures of 90°C, 150°C, 175°C, and 200°C and condenser temperatures of 60°C and 90°C. The models estimated that WHR output for both condenser temperatures would improve by over 100% when the coolant temperature was increased from 90°C to 200°C. This increased WHR output translates to relative efficiency gains as high as 31.0% for the 60°C condenser temperature and 24.2% for the 90°C condenser temperature. Individual heat exchanger models were also developed to estimate the footprint required for each WHR system. When the coolant temperature increased from 90°C to 200°C, the total heat exchanger volume increased from 16.6 × 103 cm3 to 17.1 × 103 cm3 with a 60°C condenser temperature, and decreased from 15.1 × 103 cm3 to 14.2 × 103 cm3 with a 90°C condenser temperature. Efficiency gain per total heat exchanger volume increased as the coolant temperature rose indicating that the tradeoff between efficiency gain and footprint improves at higher temperatures. However, the higher temperature systems are penalized on oil cooler size due 186PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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