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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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for the secondary heating resulted in 27% higher WHR power output than the alternate design. The authors chose to investigate this design for the remainder of the analysis. Edwards and Wagner pointed out that, although the EGR gases were hotter than the exhaust gases, the majority of the energy transfer came from the exhaust. Even though the EGR gases were taken before the turbocharger and were at higher temperature and pressure, the mass flow rate of the post-turbo exhaust stream was still significantly higher. The WHR system performance was analyzed at steady state for the peak efficiency point of 2250 rpm and 18-bar brake mean effective pressure (BMEP) and road-load point of 1500 rpm and 2-bar BMEP. BMEP is a volume normalized measurement of engine output that is not dependent on the specific size and displacement of the engine. For a four stroke engine, BMEP is defined as [36]: BMEP Wout,b (2.1) Vd N / 2 Here, ̇out,b is the brake power output of the engine, Vd is the displacement volume of the engine, and N is the engine speed. At peak efficiency, the model showed an increase from 43.9% to 47.1% thermal efficiency, giving a 7.3% relative increase. At the road-load point, the model showed an increase from 24.4% to 26.5% thermal efficiency, representing an 8.6% relative increase. One important point presented by the authors is the need to maintain exhaust temperature for after- treatment in on-road applications. This necessity limits the amount of heat that can be recovered from the post-turbo exhaust stream. In addition, Edwards and Wagner note that EGR temperatures in their study remained above 190°C after waste heat recovery, which means that an additional EGR cooler would be required to minimize volumetric efficiency losses. The volumetric efficiency is the measure of how fully the cylinders fill with air during the intake stroke and is defined as follows for diesel engines [36]: 18

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WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE

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