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cost for a complete wet recirculating cooling system—are described in detail in Tables 5-2 through 5-4 and the accompanying text. The tower and system costs are detailed in Table 5-6, and the correlations developed from the initial vendor data are presented in Figures 5-8 through 5-15. Table 5-6 Site-to-Site Cost Estimates—Wet Cooling Tower and Surface Condenser for New 500-MWe Combined-Cycle Plants with 170-MWe Steam Cycle Comparative Cost Analyses Desert Site Low First Cost Design Total Cost 2,924,000 Total BHP (in hp) 1723 -fans (in hp) 1234 -pumps (in hp) 489 Minimum Evaluated Cost Design Mountain Site 2,710,000 1851 1498 353 Valley Site 2,820,000 1794 1441 353 3,405,000 1030 713 317 Bay Area Site 2,680,000 1505 1198 307 2,960,000 987 680 307 Total Cost Total BHP (in hp) -fans (in hp) -pumps (in hp) 3,331,000 3,118,000 964 978 377 645 587 333 Figure 5-8 presents the raw data for the capital cost of the tower alone for each of the four sites over the range of acceptable circulating water flow rates plotted against tower approach (T circ. cold – T amb. wet bulb) for the “Low First Cost” design case. It can be seen that while the expected general trend of lower cost/smaller tower at higher approach temperatures is evident, there is scatter and discontinuity even within the points for each site. This results from the fact that towers are a collection of individual cells, and designs cannot vary continuously as certain limits on pressure drop, height, and other design quantities are encountered. Therefore, for general studies of this type it is appropriate to develop smoothed curves to approximate the costs for given conditions. The results will vary, but not excessively so, for the price that would be developed in a site-specific, detailed design estimate. 5-17PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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