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Parabolic Trough Solar System Piping Model Final Report NREL Contract No. AAA-2-32432-01 B. Flabeg Solar System Piping Model Design Approach The basic method used by SolPipe is to calculate the HTF header configurations based on an assumed design flow velocity in the piping. This is a key design feature. The design velocity is chosen by the user as part of a process to approximately optimize solar field piping costs, that is, to find the velocity that optimizes the tradeoff between piping size and parasitic pumping power. Generally a values in the range of 2-3 m/s have been assumed based on past experience or results of optimizations. The input parameters to SolPipe basically set the total HTF flow, the flow per loop, the number of loops and the solar field configuration. In the design tradeoff, small header pipes would reduce piping and fitting costs, but increase pumping parasitics, while larger header pipes would have the opposite effect. Setting the design velocity, however, enables calculation of the pipe diameters for subsequent costing evaluations. Header Piping, Valves and Fittings In SolPipe, as in a real solar field, header pipe sizes change along the flow path to approximately maintain the design flow velocity. In a typical parabolic trough solar field configuration, the flow in the cold header is incrementally drawn off through a collector loop and passed to the hot header. Therefore the cold header piping diameters can be reduced along the header length, reducing costs and maintaining the appropriate velocity. The SolPipe code does this calculation automatically for the configuration chosen. In doing so, the code selects standard piping sizes that result in a flow velocity close to the desired design velocity. Expansion loops are placed in the cold and hot headers between every two loops in the solar field, following the design of the SEGS plants. Pipe supports for the headers also follow SEGS plant design practice. Following this calculation scheme, the results produced by SolPipe include: number and size of pipe segments and fittings (such as reducers, elbows, and valves) for HTF system, including the headers and several loop piping elements such as the interconnection to the headers, the crossover pipes between rows, and interconnections within the SCA’s, i.e., ball joints or flex hoses. insulation on pipes and fittings at prescribed thicknesses. costs for elements described above. pressure drops throughout the complete HTF system, including the SCA’s, and the resulting parasitic pumping power requirement. User Input Several types of input data are needed from the user: number of collectors (to set the size of the solar field) basic type of layout to determine the layout configuration, e.g., like the 30 MW or 80 MW SEGS plants, or a straight-through (non-loop) system between parallel hot and cold headers. number of collectors/loop (to determine layout configuration) - 3 - September 15, 2002PDF Image | Parabolic Trough Solar System Piping Model
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