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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to provide a complete picture of the overall benefits of WHR from a high-temperature diesel engine. 7.1 Recommendations for Future Work Future research on this topic should include items listed below. However, some prioritization of these items is required. The validity of this concept will ultimately depend on the tradeoff between efficiency benefit and cost. This work provides an estimate of the first component, but raises some questions about what may be required to implement this concept while maintaining engine reliability. Therefore, the first step in understanding if WHR from a high- temperature diesel engine is viable is better understanding of the potential costs involved in the implementation of the concept. Estimates on WHR system component costs would be relatively easy to attain, but understand the engineering required to make the engine survive under high- temperature operation may require more effort. However, until this work is done it will be difficult to complete cost-benefit analysis to understand if the concept is marketable, and this should be the priority for future research on the subject (see the first four bullet points below). • Head gasket integrity was the primary issue with the experiment. It is recommended that different head gasket materials and sealing techniques be explored. Different engine block and head materials may need consideration as well. • At higher engine temperatures, the stock aluminum alloy pistons over-expand and contact the cylinder walls. Engine pistons need to be redesigned and alternative materials considered to allow operation over a wider temperature range without seizure. • Engine oil breakdown at the top of the pistons causes the piston rings to seize affecting cylinder compression and the resulting lack of lubrication leads to piston damage from 188

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