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Waste Heat Recovery from Diesel Engine Exhaust ORC

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Waste Heat Recovery from Diesel Engine Exhaust ORC ( waste-heat-recovery-from-diesel-engine-exhaust-orc )

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Energies 2020, 13, 5914 10 of 15 Figure 10. Exergy loss rate of different components. Figure 11 shows the changes in exergetic efficiency of different components with evaporation pressure. In this figure, it is shown that the exergetic efficiency of the pump is almost 60% but it is 54.0% at an evaporation pressure 1.31 MPa. Meanwhile, the exergetic efficiency of the expander is increased from 32.3% to 38.4% with the increase in evaporation pressure, as well as that of the evaporator increasing from 29.8% to 33.5%. The exergetic efficiency of the condenser and pipe are both 0%, as the exergy released from the condenser and the pipe cannot be used. It is obvious that the decrease in the exergy loss of the evaporator can decrease the exergy loss rate and increase the exergetic efficiency of the evaporator. Figure 11. Exergetic efficiency of different components. Meanwhile, an increase in the single-screw expander’s exergetic efficiency can be obtained by increasing its shaft efficiency. Because of the lower exergetic efficiency of the expander and evaporator, the highest exergetic efficiency of the ORC system is 10.8%, which is shown in Figure 12. In this figure, it is shown that the ORC system’s exergetic efficiency increased with an evaporation pressure increase from 1.31 MPa to 1.60 MPa.

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