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3. Plant Configurations and Collector Field Arrangements 3.1 One 250 MWe Plant Using the field piping arrangement of the SEGS VIII / IX plants as a reference, a potential collector field arrangement for a single 250 MWe plant was developed, as illustrated in Figure 1. The power block was located at the center of the collector field, with the heat transport fluid distribution headers arranged in an ‘H’ pattern. Four East-West headers supplied cold fluid to, and collected hot fluid from, 8 collector field segments. Each segment consisted of 87 loops, each of which contains 6 solar collector assemblies. The header pipe diameters were selected using an optimization program developed in an earlier study for NREL (Ref. 2). The largest pipe sizes required were the 54 in. cold and hot headers running North and South to and from the power block. One of the four cold headers is labeled as (A) in Figure 1; there was also a similar arrangement of hot return headers (not shown). The East-West headers, labeled as (B) in the figure, were 36 inches in diameter at the center of the field, decreasing to 6 inches in diameter at the edge of the field. At the design point, the pressure loss through the collector field was 17.4 bar, and the heat transport fluid pump power requirement was 17,400 kWe. 3.2 Four 250 MWe Plants with Separated Power Blocks Potential arrangements for four 250 MWe with separated power blocks are shown in Figures 2A (East-West configuration) and 2B (North-South). Each of the four plants essentially replicated the 250 MWe plant above. Thus, the header sizes and the collector field pressure loss are also the same. However, the heat transport fluid pump power requirement was four times as high, at 69,700 kWe. The North-South arrangement may offer some modest economic advantages over the East-West layout; i.e., the perimeter fence should be shorter, and travel times between collector fields may be slightly less. However, for the purposes of the study, the differences were believed to small enough that both configurations offered the same performance and economics. 3.3 Four 250 MWe Plants with Adjacent Power Blocks An East-West arrangement for four 250 MWe plants with adjacent power blocks is illustrated in Figure 3A, and a North-South arrangement is shown in Figure 3B. The heat transport fluid header lengths and pressure losses for the North-South layout were much lower than the East-West arrangement, and the former was selected for the analysis. -4- Task 3 Multiple Plants at a Common SitePDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis 2005
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