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Parabolic Trough Solar System Piping Model Final Report NREL Contract No. AAA-2-32432-01 C. NREL Solar System Piping Model Under contract to NREL, Kearney & Associates and Nexant worked together to develop a solar system piping model to develop piping system costs. Bruce Kelly of Nexant devised a new method for this purpose, with particular emphasis on incorporating added features in the model to automate the optimization method. The following description provides detailed information on the approach and construction of the model. Approach The coding of the new model differs completely from SolPipe, though the objectives are similar. One key difference is that the new model includes internal optimizations to arrive at a conceptual design. The optimum collector field piping arrangement should be one in which the sum of the following three elements is a minimum: 1) the capital cost of the pipe, insulation, and supports; 2) the equivalent capital cost of the thermal losses through the pipe insulation; and 3) the equivalent capital cost of the electric energy to circulate the fluid through the piping. A draft optimization model using Excel spreadsheet has been assembled which calculates the pipe capital and operating costs for two representative types of field layouts. The sections below describe how the model was assembled and how it operates. Generic Collector Field Layouts In the draft model, two field layouts are available as an option for the user: an ‘H’ field layout for collector field areas greater than 400,000 m2, and an ‘I’ field layout for areas less than 400,000 m2. ‘H’ Field Layout An example of a possible ‘H’ field piping layout for a representative 80 MWe plant has been prepared, as follows: • The field is divided into 4 header-pair sections, with the power block located at the center of the field. Cold fluid is distributed from the cold header to solar fields on each side of the header, passing through a series of SCAs arranged in a row, crossing over at the end to an adjacent row, and returning to the hot header via a symmetrical set of SCAs. This arrangement is referred to as a “loop”. Hence there are similar loops on each side of the headers along the header length. In the base case, the headers run East-West. • Each collector loop consists of 6 LS-3 solar collector assemblies, with the flow going out from the cold header through 3 assemblies, reversing direction, and then returning to the hot header through the remaining 3 assemblies. A total of 36 loops is supplied from the two headers. The arrangement is illustrated in Figure 1. - 5 - September 15, 2002PDF Image | Parabolic Trough Solar System Piping Model
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