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Parabolic Trough Solar System Piping Model Final Report NREL Contract No. AAA-2-32432-01 D. General Comparison of Results Model Comparison The following table compares the features of the Flabeg and NREL models: Table 2. Comparison of features in the SolPipe and NREL models Feature Overall layout Pipe sizing Pipe wall thickness Piping/fitting capital costs Piping/fitting labor costs Insulation costs Pumping power cost Heat loss Expansion loops Loops Valves/fittings Calculation method Input data SolPipe H (80MW) or I (30MW) with loops; also straight no-loop layout Sized based on design velocity set by user Uses Sked 40 piping Table lookup from vendor data Table lookup from vendor data Table lookup from vendor data Not used Not used Based on SEGS design; between every 2 loops Design based on SEGS Specified Simple arithmetic within cells Entered in Input worksheet NREL Presently H and I configurations Optimizes each piping section (defined as header piping between loop connections). See below. Wall thickness is no thicker than needed for required pressure Table lookup from vendor data Based on Bechtel experience Table lookup from Solar Two data based on both ID and thickness of insulation Calculated for typical year Calculated for typical year Same Same Same Uses macros Entered in Input worksheet Optimization for pipe size Not done Per section: pipe D assumed model calculates wall thickness, then capital costs, equiv. heat loss cost, equiv. pumping cost. Then increases D to next std size and recalculates cost for comparison. Within this process, thickness of insulation is optimized. A case was run for a 30MW plant using the I configuration, similar to the SEGS VI solar plant, for comparison of the NREL and SolPipe codes. The cost results compare satisfactorily for the headers as a whole -- NREL: $16.6/m2 vs. SolPipe: $16.5/m2 -- but differ in several specific cost elements due to understandable differences in the model. The header piping sizes are not identical due to the different methods used to select the appropriate diameters. Costs for installed pipe of the same size and type are higher in the NREL model because the labor hours per unit length based on Bechtel historical data base are higher than those assumed in SolPipe. Different pipe sizes lead to variations in fitting and insulation costs, causing a further deviation in the overall cost. - 16 - September 15, 2002PDF Image | Parabolic Trough Solar System Piping Model
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