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36 & Qevaporator =m&WF(hv −hl)=m&HTF(hHTF,in,evaporator −hHTF,in,preheater) [3.1.30] [3.1.31] [3.1.32] in equation [3.1.33]. This combined area becomes a design variable and the solution to the set of equations yields the relative area required for each process. The superheater is assigned an independent heat exchanger area and also solved using a log-mean temperature difference technique. Turbine The turbine in the simulation model uses an isentropic efficiency (equation [3.1.3]) to describe its performance. Turbine efficiency, in general, is strongly dependent on how the operating flow relates to the design flow rate [Bartlett, 1958]. A second order polynomial was fit to a series of turbine design points from the APS plant to approximate turbine performance, as shown in equation [3.1.34]. The functional form of the fit is based on correlations developed for steam-turbines [Bartlett, 1958]. & Qpreheater =UpreheaterApreheater∆TLM,preheater & Q =U A ∆T evaporator evaporator evaporator A =A +A LM ,evaporator [3.1.33] The preheater and evaporator are coupled by a combined area, Apreheater+evaporator , as seen preheater+evaporator preheater evaporator η ⎛ m& ⎞2 ⎛ m& ⎞ =−0.1423⋅⎜ ⎟ +0.2981⋅⎜ ⎟+0.6127 [3.1.34] turbine ⎜m& ⎟ ⎜m& ⎟ ⎝ ref ⎠ ⎝ ref ⎠ Recuperator and Condenser The “cold” side heat exchangers (recuperator, desuperheater and condenser) are a mirror image of the boiler. Figure 3.14 shows the fluid flows in the condenser, recuperator and desuperheater.PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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