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Parabolic Trough Solar System Piping Model Final Report NREL Contract No. AAA-2-32432-01 1. The number of loops, and the hydraulic characteristics of each loop, are set automatically, based on the field configuration, the fluid number, the cold fluid temperature, the hot fluid temperature, and the collector field power rating. 2. A trial diameter is selected for each header section. The capital cost, and the equivalent capital cost of the insulation heat loss and pump energy, are calculated. 3. New costs are calculated for the following pipe sizes: two standard sizes below the trial diameter; one standard size below; one standard size above; and two standard sizes above. The costs are stored in a temporary matrix, and the size that provided the lowest cost is selected. During the calculation of the new costs, 1) the pressure distribution is recalculated to provide a pressure at the outlet of the hot header equal to the minimum value set by the user, and 2) the thickness of the thermal insulation is adjusted such that the sum of the capital cost and the equivalent capital cost of the heat loss is a minimum. (The calculation to optimize the insulation thickness can also be run independently of the header optimization by pushing the button labeled ‘Optimum insulation thickness’.) 4. The process is repeated for each header section. 5. The process is repeated again for all of the cold and hot header sections to ensure local cost minima were not selected in preference to an overall cost minimum. The optimum cold header section diameters were shown in Row 7, and the optimum hot header section diameters were shown in Row 130. Piping and Valves for the Steam Generator and the Heat Transport Fluid Pumps Cost estimates are also developed for the piping system in and around the steam generator and the heat transport fluid pumps. Line sizes are calculated for the 8 lines summarized in Table 1. Table 1 Line 1 2 3 4 5 6 7 8 Steam Generator and Heat Transport Fluid Pump Line Designation From Expansion vessel or thermal storage tank Pump suction header Individual pump discharge Pump discharge header Collector field section outlet headers Steam generator supply header Inter steam generator piping Steam generator outlet header To Pump suction header Individual pump inlet Pump discharge header Collector field section headers Expansion vessel or thermal storage tank Steam generator supply header Inter steam generator piping Expansion vessel or thermal storage tank - 14 - September 15, 2002PDF Image | Parabolic Trough Solar System Piping Model
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