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Parabolic Trough Solar System Piping Model Final Report NREL Contract No. AAA-2-32432-01 The bases for the calculations are as follows: • Economic optimizations of the line diameters are not performed; rather, the line sizes are based on a fluid velocity specified by the user to meet the system hydraulic requirements, such as uniform fluid distribution or maximum allowable pressure loss. The velocity is specified in Cell B17 on the worksheet labeled ‘Pump-SGS’. • The number and capacity of the heat transport fluid pumps are specified by the user in Cell B18 and Cell B19, respectively, on the worksheet labeled ‘Pump-SGS’. • The fluid flow rates in Lines 1 through 4 are calculated based on the following: the collector field thermal power rating in ‘Model Inputs’!Cell B3; the fluid number in Cell B16; the cold fluid temperature in Cell B25; and the hot fluid temperature in Cell B26. • The fluid flow rates in Lines 5 through 8 are calculated based on the following: the steam generator thermal power rating in ‘Model Inputs’!Cell B4; the fluid number in Cell B16; the cold fluid temperature in Cell B25; and the hot fluid temperature in Cell B26. (The model allows separate values for Cell B3 and Cell B4; thus, the ratio of Cell B3 to Cell B4 is effectively the solar multiple for the plant.) • One gate valve is located in each of Lines 1, 2, and 3, and one check valve is located in each Line 3. • Long radius elbows are located in Line 1, and in Lines 2 through 8, for thermal expansion loops. (The number of elbows is currently an allowance; the actual number would be an input to the model following a stress analysis of the piping system. Similarly, the pipe lengths shown for Lines 1 through 8 are also currently an allowance, and must be revised following the development of the piping arrangement.) The pipe, valve, fitting, support, and insulation costs for the 8 lines are summarized on the Model Inputs worksheet. The cost for Line 2 and the cost for Line 3 were multiplied by the number of heat transport fluid pumps in the calculation of the total system piping cost. - 15 - September 15, 2002PDF Image | Parabolic Trough Solar System Piping Model
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