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estimate the required footprint for the WHR system for each coolant temperature. As previously discussed, modeling was performed for an engine speed of 3100 rpm and torque of 24 N-m at coolant temperatures of 90°C, 150°C, 175°C, and 200°C. Each system was modeled with a condenser temperature of 60°C and 90°C for comparison. 6.4.1 Thermodynamic Modeling Results Figures 6-18 through 6-33 show the results of the thermodynamic analysis for the four coolant temperatures and two condenser temperatures that were modeled. The efficiency gain for the eight systems is summarized in Table 6-1. For each model, a figure shows the system diagram detailing the results of the analysis including temperatures, flow rates, and power in and out of the system. The results shown in these eight figures were the basis for the individual heat exchanger models that will be described in the next section. In addition to the system diagram, a T-s diagram is included for each model to provide a visual representation of each cycle along with the temperature drop of the exhaust as the working fluid is heated in the superheater and the exhaust evaporator. The remainder of this section will be devoted to describing the results of the analysis for each of the eight systems. The first system modeled was the state-of-the-art system with 90°C engine coolant and a 60°C condenser temperature (Figure 6-18). Starting at the bottom of the diagram, the ethanol leaves the condenser at 60°C with a quality of exactly zero and a mass flow rate of 5.06 g s-1. The liquid ethanol is then pressurized by the pump, which uses 0.04 kW of power and raises the ethanol temperature to 62.0°C. The ethanol then passes through the recuperator, where it is heated to 153.7°C by the hot ethanol from the turbine outlet. Inside the exhaust evaporator, the ethanol is heated up to the 200°C saturation temperature where it is subsequently boiled so that the ethanol leaves the evaporator with a quality of unity. The evaporation of the ethanol can also be seen in 159PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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