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Organic Rankine Cycle Solar-Thermal Powerplants

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Organic Rankine Cycle Solar-Thermal Powerplants ( organic-rankine-cycle-solar-thermal-powerplants )

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46 Table 4.1 Coolidge ORC Design Specifications Specification Solar Field Inlet Temperature Solar Field Exit Temperature Caloria HT-43 Flow Rate Toluene Flow Rate Turbine Inlet Temperature Turbine Inlet Pressure Parasitic Power Cycle Efficiency Condensing Temperature Boiler Approach Temperature 200 °C 288 °C 15,740 kg/h 6305 kg/h 268 °C 1034 kPa 24 kW 20.4 % 41 °C 20 °C These design specifications are not sufficient to constrain the rapid screening model. Data were unavailable for recuperator and condenser pressure drops, turbine and pump efficiencies, and recuperator effectiveness. Unconstrained performance parameters were approximated using engineering judgment in order for model outputs to approach the reported performance of the Coolidge plant. While this does not capture the precise performance of the Coolidge plant, it is sufficient for establishing a base case for comparison. Note that for consistent power cycle comparison the maximum working fluid temperature is constrained to 268°C in all cases. 4.2.1 Coolidge Reference Cycle The reference Coolidge plant cycle is a textbook Rankine cycle with the addition of turbine-exhaust recuperation for feedwater heating, analogous to the standard design described in section 2.2.1. Figure 4.1 shows a schematic of the power cycle with state points labeled that correspond to the T-s diagram in Fig. 4.2.

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