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CHAPTER 7. CONCLUSIONS AND RECOMMENDATIONS The present study explores a way to improve diesel engine efficiency through improved WHR. Historically, WHR from combustion engines is fundamentally limited by the low heat capacity rate of the exhaust gases and the low temperature of the engine coolant. The result is underutilization of the available waste heat and relatively small efficiency gains with respect to the energy present in the waste heat sources (i.e., <10% relative increase). Raising the coolant temperature and directly heating the WHR system working fluid in the engine block greatly increases the availability of the heat lost to the engine coolant and improves the utilization of this waste heat. This idea has been demonstrated using modeling to estimate the potential WHR gains, which can be >30% in some circumstances. However, no experimental investigations exist where experimental data from an engine running at elevated temperatures is collected, and is then used to determine the energy balance to supply realistic WHR model inputs. The current study is the only known investigation where an engine was operated at elevated coolant temperatures to evaluate the potential of WHR from a high-temperature engine. A small 3-cylinder diesel engine was operated at coolant temperatures between 90°C and 200°C. To accomplish this, the engine was modified to improve durability under high temperature operation. The cylinder head gasket was replaced with a solid copper gasket and stainless steel O-rings were added to the engine block to seal the combustion chambers. Oil seals were replaced with high- temperature VitonTM alternatives to better withstand high temperatures. A heat shield was fabricated to protect the high-pressure fuel pump from additional heat radiating from the engine block. The waste heat in the exhaust, coolant, and engine oil was measured and the exergy in each waste heat stream was calculated. Custom cooling and engine oil systems were designed and 185PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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