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Parabolic Trough Solar System Piping Model Final Report NREL Contract No. AAA-2-32432-01 sufficient power cycle information to set the HTF flow rate (either in a simplified or more detailed form). other various layout parameters, e.g., distance between rows unit cost data for piping and fittings by type and size detailed assumptions related to pressure drop calculations The input data sheet is formatted to differentiate between input data that needs to be provided for each new case (like solar field size and power rating), and input data that is required for the calculations but is not often changed by the user (if ever, such as standard pipe sizes and basic solar collector design information). The HTF flow is calculated from power cycle data to be input by the user. Better results are obtained if detailed thermodynamic data is available from a power cycle calculation, but quite reasonable results can also be obtained via an optional method that requires only simplified power cycle data. Certain data is imbedded in the cost worksheets, such as piping, insulation and fitting costs, fluid properties, and valve arrangements. All these can, of course, be changed within the code if desired. Solar field layouts that can be modeled in the Flabeg code generally reflect SEGS design practice for 30 MW and 80 MW solar plants, and are specified by the user. Design Optimization For a typical solar power plant conceptual design study, an initial design configuration and flow velocity in the headers is chosen by the user. The results of SolPipe for piping cost and pumping power are fed into the Flabeg models for overall cost and performance, and the LEC determined. Variations on the input, such as the design velocity, are then varied to find the optimum value that provides the lowest LEC. For this specific parameter, recent results from the salt HTF study indicated that the LEC variation is relatively flat for a range of 2-4 m/s in flow velocity, with the lowest values at the low end. - 4 - September 15, 2002PDF Image | Parabolic Trough Solar System Piping Model
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