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Energies 2020, 13, 5914 8 of 15 Energies 2020, 13, x 8 of 15 The evolution of temperature in the evaporator during the heat transfer at various pressure values The evolution of temperature in the evaporator during the heat transfer at various pressure is given in Figure 6. From the figure, it can be seen, due to the location of the pinch point, that the heat values is given in Figure 6. From the figure, it can be seen, due to the location of the pinch point, that transfer process in the evaporator has a lot of irreversibility and therefore high exergy destruction. the heat transfer process in the evaporator has a lot of irreversibility and therefore high exergy For the various evaporation pressures, the temperatures of R123 at the inlet/outlet of the evaporator destruction. For the various evaporation pressures, the temperatures of R123 at the inlet/outlet of the were 39.6/117.1 ◦C, 42.6/121.9 ◦C, 45.9/128.9 ◦C, 48.8/139.6 ◦C, and 50.4/140.8 ◦C. evaporator were 39.6/117.1 °C, 42.6/121.9 °C, 45.9/128.9 °C, 48.8/139.6 °C, and 50.4/140.8 °C. Exhaust gas R123 Heat transfer 450 375 300 225 150 75 Heat transfer in the evaporator Figure 6. Temperature evolution in the evaporator. Figure 6. Temperature evolution in the evaporator. ThecchangeeiinttheepooweerroouttputtoofftthheeeexxppaannddeerrwitihtheevvaappoorraatotorrpprreesssuurreeisissshhoownnaassFFigiguurere77. . IInththisisfifigguurere,,thtehemminiinmimumumvavlualeuies 7is.172.1k2WkwWitwhi1t.h31M.31PaMaPnadatnhedmthaeximauxmimvuamlueviaslu9.e62isk9W.62wkitWh 1w.6i0thM1.P6a0.MDPuae. Dtoutehteoitnhcereinacsreeainseeivnaepvoarpaotiroantiopnrepsrseusrseu,rteh,ethexepxapnasniosnionrartaiotioacarcorsossththeeexpanderr iinccrreased,, whiich consequenttiiallly lled to an increase in power output. Figure 7. Power output of the single-screw expander. Figure 7. Power output of the single-screw expander. The change in the shaft efficiency of expander with different evaporator pressures is shown as The change in the shaft efficiency of expander with different evaporator pressures is shown as Figure 8. In the figure, it is shown that the highest value is 49.8% at 1.55 MPa of evaporation pressure Figure 8. In the figure, it is shown that the highest value is 49.8% at 1.55 MPa of evaporation pressure and the lowest value is 42.1% at 1.31 MPa of evaporator pressure. Although the shaft efficiency of and the lowest value is 42.1% at 1.31 MPa of evaporator pressure. Although the shaft efficiency of this this expander is increased with the increase in evaporation pressure, it is a little low still and results expander is increased with the increase in evaporation pressure, it is a little low still and results in in lower power output. lower power output. Temperature (oC)PDF Image | Waste Heat Recovery from Diesel Engine Exhaust ORC
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