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5.2 Thermodynamic Analysis A flow chart for the thermodynamic analysis is shown in Figure 5-3. The thermodynamic models were built using a number of assumptions listed in Table 5-1. The experiment was performed at approximately 1,500 m above sea level, so the ambient air pressure was found to be near 85 kPa. Therefore, it was assumed that the exhaust pressure was 100 kPa which represents a gauge pressure of approximately 15 kPa. The evaporator and recuperator effectiveness were set at 80% for all models. Isentropic pump and turbine efficiency were assumed to be 50% and 60%, respectively. The quality of the ethanol at the evaporator outlet was assumed to be exactly 1, and the quality of the ethanol at the condenser outlet was assumed to be exactly 0. A target closest approach temperature (CAT) for the evaporator was set at 5°C for all cases. Finally, a maximum superheat temperature was set at 375°C, though the superheat temperature was often lower than the maximum in order to meet the CAT requirements. Next, inputs from the experiment were entered into the model (Table 5-2). The inputs included the exhaust temperature, air/fuel ratio, fuel mass flow rate, exhaust and coolant heat flow rates, and exhaust mass fraction for the lean combustion products of CO2, H2O, N2, and O2. The exhaust temperature was used as an input for Figure 5-3. Flow chart for thermodynamic analysis. 71PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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