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From Table 5-6, the ethanol enthalpy at point 3 is 585 kJ kg-1 and the ethanol enthalpy at point 5 is 1,330.7 kJ kg-1. Using equation (5.21) and the mass flow rate through the engine of 8.45 g s-1, the heat transfer rate in the engine is found to be 6.30 kW. Using equation (5.22) and the mass flow rate of ethanol through the evaporator of 5.89 g s-1, the heat transfer rate in the evaporator is found to be 4.39 kW. Note that the ethanol mass flow rate through the exhaust evaporator is larger in the high-temperature WHR system than in the state-of-the-art system. The extra waste heat recovered in the engine block results in a much larger combined ethanol mass flow rate through the superheater in the high-temperature system. Therefore, the superheat temperature is much lower at 240°C than the 375°C superheat temperature in the low-temperature example. The lower maximum ethanol temperature in the system results in a smaller ethanol inlet temperature at the exhaust evaporator. This lower inlet temperature, along with the lower saturation temperature, results in a smaller ethanol temperature difference across the exhaust evaporator than seen in the 90°C system. To fully utilize the remaining exhaust waste heat, the ethanol mass flow through the exhaust evaporate had to be increased. The remainder of the thermodynamic analysis for the high- temperature WHR systems is identical to that described for the 90°C systems. The next section will describe the modeling of the individual heat exchangers for the WHR systems. 5.3 Detailed System Modeling The thermodynamic analysis described in the previous section provided estimates of the WHR power output and overall efficiency gain for each of eight WHR system configurations with varying coolant and condenser temperatures. However, one of the drawbacks of WHR is the additional space required for the additional components. Of the required components, the heat exchangers take up the most space and, therefore, further analysis was performed to understand how the space required changes for each WHR system and what tradeoffs may exist between 84PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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