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Figure 6-47. Total heat exchanger volume and efficiency increase for 60°C condenser temperature systems. temperature (Figures 6-47). For example, the total heat exchanger volume for the 60°C condenser and 90°C coolant model is 16.6 × 103 cm3, which increases to 17.1 × 103 cm3 at a coolant temperature of 200°C (a 3% relative increase). This increase in heat exchanger size is accompanied by an increase in relative efficiency gain from 15.3% at 90°C to 31.0% at 200°C, or a 103% increase. However, the trend for the 90°C condenser systems showed very little change with coolant temperature (Figure 6-48). For the 90°C condenser models, the total heat exchanger volume actually decreased from 15.1 × 103 cm3 at 90°C coolant temperature to 14.2 × 103 cm3 at 200 °C (a 6% decrease). The 90°C condenser models estimated an efficiency increase from 11.7% at 90°C coolant temperature to 24.2% at 200°C (a 107% rise). As with the other results described in previous sections, the results when the coolant temperature is raised to 175°C do not follow the trend seen for the other test points. Here, the reduction in exhaust temperature that accompanied the increased head gasket leakage at 175°C tended to reduce, or partially offset, the increase for both efficiency gain and total heat exchanger volume. Another way to evaluate the efficiency and 182PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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