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Cycle Type Table 1. Summary List of Cycles Analyzed in this Report Efficiency Gross Parasitic HTF HTF Working fluid Pentane Pentane Pentane/ iso- butane (90/10) Pentane Pentane/ iso- butane (95/5) Basic ORC 12.5 /pure working fluid ORC 20.1 recuperation with pure working fluid ORC 20.4 recuperation with mixed working fluid ORC 20.6 recuperation with reheat pure working fluid ORC 20.7 recuperation with reheat mixed working fluid Electricity (kWe) 1,093 1,102 1,134 1,140 1,157 (kWe) Flow (lbm/hr) 116 92,141 120 92,018 130 91,065 Outlet Temp. (°F) 182 344 337 413 410 120 124 129,829 129,026 3.1 Assumptions Applied to the Current Analysis All the cycles were analyzed by NREL staff under the following conditions: solar resource (hot Heat Transfer Fluid [HTF]), temperature 580oF (304°C), boiler pressure 610 psia (4.2 MPa), turbine inlet pressure 600 psia (4.14 MPa), condenser pressure 20 psia (0.138 MPa), ambient temperature of 80°F (26.7°C), turbine efficiency of 0.75, pump efficiency of 0.67, generator efficiency 0.94, and recuperator effectiveness of 0.80. A pinch point of 17°F (9.4°C) was assumed for the heater/boiler, while the pinch point for the air cooler/condenser was assumed to be 13°F (7.2°C). 3.2 ORC Power Cycle Analysis We identified the following potential binary cycles for application to the solar trough systems: the basic ORC using hydrocarbons as working fluid, ORC with recuperation using pure hydrocarbons, ORC with recuperation using mixed hydrocarbons, ORC with recuperation and reheat using pure hydrocarbons, ORC with recuperation and reheat using mixed hydrocarbons, 6PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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