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reduction in cycle area can been seen in the T-s diagram in Figure 6-33. The superheat temperature was maintained at 375°C and the net WHR output was calculated as 1.92 kW, for a combined output of 9.56 kW. With a fuel energy input of 28.02 kW, the 90°C condenser temperature system gave a combined efficiency of 35.35%, or a 24.16% relative efficiency increase over the baseline engine test. Table 6-1. Relative efficiency gain for eight WHR system models. Relative Efficiency Gain Coolant Temperature 60°C Condenser 90 15.3% 150 25.2% 175 25.1% 200 31.0% 6.4.2 WHR System Output and Efficiency Gain 90°C Condenser 11.7% 15.7% 17.7% 24.2% The goal of WHR is to increase overall thermal efficiency by harnessing wasted energy and converting it to additional power. The thermodynamic modeling described in Chapter 5 provided the input values for the individual heat exchanger models, but also provided estimates of the power output of the WHR systems at each coolant temperature. The WHR system power output results are shown in Figure 6-34 for 3100 rpm and 24 N-m of torque and each condenser temperature evaluated (60°C and 90°C). As hypothesized, the WHR system power output is shown to increase overall as coolant temperature is raised. For the 90°C condenser temperature, the output increases from 0.89 kW for the state-of-the-art 90°C coolant temperature system to 1.92 kW at 200°C coolant temperature, or a 116% rise. At a condenser temperature of 60°C, the WHR system output rises from 1.17 kW for the state-of-the-art system at 90°C coolant temperature to 2.45 kW at 200°C, giving an increase of 109%. The WHR system output does decrease from 150°C to 175°C coolant temperature for the 60°C condenser temperature. Here, the estimated WHR system 172PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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