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Now consider Figure 2.14 which shows performance of the same system seen in Figure 2.13 but with the addition of recuperation at 90% effectiveness. Specific work as a function of pressure is unchanged, as it should be since the expansion is independent of the presence of recuperation (assuming recuperation induces no pressure drops). Cycle efficiency now passes through a very clear maximum. Energy recovered by the recuperator decreases with increasing turbine inlet pressure, shown in Figure 2.14. Heat addition shows less of a discernable trend when compared to the case with no recuperation because the presence of the recuperator roughly compensates for the change in heat addition as a function of pressure. As a result, the maximum in efficiency is driven by the maximum in work identified in Figure 2.15. This is an interesting result because that same maximum had no discernable effect on cycle efficiency in the non-recuperated case. Figure 2.14: Isentropic turbine work, heat addition and cycle efficiency as a function of turbine inlet pressure for a recuperated ORC. Figure 2.15 and Figure 2.16 show cycle efficiency as a function of turbine inlet pressure and recuperator effectiveness for two cycle configurations. Figure 2.15 is the case studied in the previous examples, with no pressure drop across the recuperator. Figure 2.16 is identical except for the addition of a 100 kPa pressure drop across the recuperator. The efficiency trends at various levels of effectiveness are identical for the two cases, 19PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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