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positive effect on the objective functions. This is why the scattered distribution for the ORC turbine inlet pressure has a scattered distribution. Fig. 6.73 shows the variation of turbine inlet temperature on both objective functions. It is observed that an increase in turbine inlet temperature increase the exergy efficiency of the system for point A-C on the Pareto curve. Increasing the turbine inlet temperature leads to an increase in turbine inlet enthalpy while keep other parameters fixed, this increase leads to an increase in turbine work which finally results in an increase in exergy efficiency according to equation (6.4). On the other side, an increase in turbine inlet temperature increase the total cost of the system which is due to an increase in turbine purchase cost. An increase in turbine purchase cost leads to an increase in the total cost of the system. Since an increase in this parameter has positive and negative effects on both objective functions, the variation of this design parameter within its allowable range exhibits a scattered distribution as shown in Fig. 6.69d. Figure 6.73: Effects of turbine inlet pressure on both objective functions. Fig. 6.74 shows the effect of evaporator pinch point temperatures on both objective functions. It is seen that an increase in pinch point temperature results in a decrease in system exergy efficiency. This is due to the fact that the higher the pinch point temperature, the lower the energy being utilized in evaporator which leads to a reduction of ORC turbine power output. On the other side, an increase in pinch point temperature while fixing other design parameters, 184PDF Image | Energy Systems for Multigeneration Purposes
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