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combustion, which reduces NOx and particulate emissions. A one-cylinder diesel engine running ALPING was used to provide data for a WHR model. Hot exhaust gas recirculation was evaluated for hydrocarbon and carbon monoxide emission reduction (both of which are typically high in low temperature combustion) as well as efficiency improvement. Turbocharging and exhaust backpressure were simulated using compressed air and surge tanks. Measurements included engine power output, intake, exhaust, coolant, and oil temperatures, air and gas flow rates, and exhaust emissions. Data was collected at 1700 rpm for both quarter and half engine loads. The theoretical WHR system used R113 as the working fluid and the exhaust stream as the sole source of waste heat. A single heat exchanger was used to evaporate the R113 and produce 179°C vapor at 2.0 MPa. The authors estimated that a maximum thermal efficiency increase of 14% was possible, with a 7% average thermal efficiency increase over the range of tested injection timings and loads. EGR systems recirculate exhaust gases back into the combustion chamber to reduce NOx emissions under certain running conditions. EGR coolers are often used to lower exhaust gas temperatures before the gases are added to the intake air and pulled into the combustion chamber. The excess heat is typically transferred to the engine cooling system and subsequently rejected to the atmosphere as waste heat. The benefit of capturing heat from the EGR system is that the gases are diverted from the exhaust system before travelling through turbochargers and catalysts, and, therefore, are recovered at the highest possible temperature. Two journal articles based on a project undertaken by AVL Powertrain Engineering provide some insight into the realistic gains from using waste heat from the EGR system. Teng [34] and Park et al. [2] provide results from an experiment comparing the output of an ORC powered by EGR heat, exhaust heat, and both EGR and exhaust heat combined. The experiment was conducted on a 10.8L Cummins ISM engine and each WHR system setup was tested at four Heavy-Duty Supplemental Emissions Test (SET) mode 15PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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