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4.2 Evaluation of Alternative Organic Rankine Cycle Configurations The recuperated cycle presented in section 2.2.1 is the most commercially available organic Rankine cycle configuration. While this configuration offers great simplicity, it is unclear whether it represents the limit of achievable efficiency. This section considers a variety of common power cycle modifications in the context of an actual ORC design in an attempt to identify potential for improving cycle efficiency. The Coolidge solar-thermal powerplant is used here as the baseline for comparison. It was one of four plants built to demonstrate alternative means for producing irrigation pumping power [Larson, 1987]. It used 2140 m2 of parabolic trough collectors to heat CaloriaTM HT-43 HTF from 200oC to 288oC. The CaloriaTM delivered thermal energy to an ORC with toluene as the working fluid. The plant was designed to generate 200 kW of electricity. The plant also included a HTF storage tank to provide on-demand power in periods of low insolation. The operating conditions and component performance criteria obtained from the Coolidge plant are used here as a baseline for considering alternate cycle configurations with the rapid-screening model. In total, five ORC plants are modeled based on the Coolidge design criteria, where the reference cycle refers to the Coolidge plant’s design configuration: 1. Reference cycle 2. Reference cycle without recuperation 4. Reference cycle with reheat 4. Reference cycle with feedwater heating in place of recuperation 5. Reference cycle with feedwater heating and recuperation Table 4.1 shows the design specifications from the Coolidge plant used to determine the model input parameters for the reference case [Larson, 1987]. 45PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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