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Case Study Results The effects of ambient meteorological condition and site elevation were addressed through the development of cost estimates for the four selected case study sites. In order to evaluate the tradeoff between initial capital cost and the costs of operating power requirements and capacity/heat rate penalties, two design points were chosen. For the unconstrained water availability case and the constrained case (50% of unconstrained water use), the units were sized to maintain 2.5 in. Hga back pressure at both average meteorological conditions (Tavg. dry bulb = 67o F; Tavg. wet bulb=60oF) and 1% conditions (the ambient temperature and wet bulb exceeded for only 1% of the time, i.e., 80 hours/year). In dry-mode operation, a turbine back pressure of 2.5 in. Hga cannot be maintained for either the average or the 1% dry bulb temperatures. Therefore, for dry mode operation, the design points were set as 7.0 in. Hga for average temperature and 10.0 in. Hga for 1% temperature. Tables 8-2 to 8-4 provide capital cost breakdowns by cost element for selected case study examples. Table 8-2 presents cost requirements for the evaporative condenser system with unconstrained water availability for the Central Valley site. Table 8-2 6 Capital Cost Breakdown for a 10 lb/hr Steam Condenser, Central Valley Site—Unconstrained Water Availability (for New 500-MWe Combined-Cycle Plants with 170-MWe Steam Cycle) Emerging Technologies Element Base unit Recirculating spray pumps Steam duct Walkways, ladders Condensate collection and return Electrical and controls Steam ejector Installation Auxiliary cooling @ ~ 5–6% (see Table 8-4 for example breakdown) Total installed cost Cost ($1000s) 2845 266 336 75 150 75 60 73 257 4862 Concrete works - plenum - basin 287 439 8-5PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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