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Figure 3.14: Cold side heat exchanger orientation and process flow for the simulation model The technique used to compute performance for the preheater and evaporator is employed here with the condenser and desuperheater. The only difference is the constrained variables. In the boiler, pressure is a design variable and mass flow is a function of the heat exchanger performance. In the condensing section, mass flow rate is known (determined in boiler) and pressure is a function of the heat exchanger performance. The recuperator, like the superheater is assigned an independent heat exchange surface area. Pump Isentropic pump efficiency (equation [3.1.9]) is used to describe pump performance. Part-load pump efficiency is approximated as a function of mass flow using a relationship presented by Lippke [1998]: [3.1.35] pump ref ⎜m& ⎟ ref⎜m& ⎟ ⎝ ref ⎠ ⎝ ref ⎠ 37 ⎛ m& ⎞ ⎛ m& ⎞2 η =2⋅η ⋅⎜ ⎟−η ⎜ ⎟ where ref values represent design conditions. 3.3 Model Calibration and Validation 3.3.1 Plant Description The Arizona public service (APS) has sponsored the construction of a 1 MW parabolic trough organic Rankine cycle (PTORC) powerplant by SolarGenix and ORMAT. The APS plant uses n-pentane as the power cycle working fluid and Radco Industries XCELTHERM®600 as the solar field heat transfer fluid. Figure 3.15 shows a flowPDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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