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Dry System Cost Analysis In estimating costs of dry systems for the four case study sites, vendors were free to select the design point of their own choosing, based presumably on their engineering and commercial experience with the appropriate tradeoff between initial cost and performance penalties. As a result, the design ambient temperature for a particular site differed significantly from estimate to estimate, leading to towers of significantly different size and cost for each location. Figure 5-17 gives the range of capital cost vs. ITD. These costs vary by a factor of two for ACC sizes ranging from an ITD of 20°F (large surface area) to 55°F (small surface area). 50,000,000 45,000,000 40,000,000 35,000,000 30,000,000 25,000,000 20,000,000 15,000,000 10,000,000 Figure 5-17 Capital Cost vs. ITD for Air-Cooled Condenser (for New 500-MWe Facilities with 170-MWe Steam Cycle) Figure 5-18 displays the same data with costs expressed in $/kWe, since this is a common metric for estimating the cost of power plants and their components. It should be noted that all the case studies were for the same heat load, steam flow, and turbine back pressure, differing only in site elevation (slightly) and in site temperature and humidity profiles; extrapolating these costs on a $/kWe basis to units of very different size or operating conditions should be done with caution. For the cases in this study, the costs lie on a single curve over a wide range of ITD (from 20 to 55°F), with a corresponding cost range of $290 to $125/kWe. Comparative Cost Analyses 10 15 20 25 30 35 40 45 50 55 60 ITD, deg F 5-27 Capital CostPDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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