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Comparative Cost Analyses Budget prices for a dry cooling tower and associated heat transfer and flow components were obtained from several major vendors for each of the four sites described in Section 4. The vendors were provided with information on the site location and meteorology and plant characteristics. A brief discussion of some of the cost items follows. Installation/Erection Installation and erection costs were quoted separately, with the usual caution that they could be quite site specific. In some cases, they were expressed as “per cell” costs ranging from ~ $175,000 to $225,000. In other cases, they were quoted as a total cost for the entire tower, based apparently on an estimated percentage of the ACC capital cost. When the per cell costs were translated into a total tower cost, they too were approximately a fixed percentage of the capital costs. However, the calculated percentages varied considerably from source to source, ranging from under 30% to over 50%. Nonetheless, the total costs (capital plus installation/erection) shown in Figure 5-17 lie on a single curve. The good agreement among overlapping points from the several sources suggests that there may be compensating differences among what is included in which part of the estimate. Electrical Wiring/Hook-Up Electrical hook-up was normally not included in the base price. Again, a per cell estimate was given, with a fairly wide range of $20,000 to $35,000 per cell. When applied to the individual cases, this worked out to a percentage of the base installed cost ranging from 3.5 to 7.5%. An intermediate value of 5.5% was used in the comparisons. Auxiliary Cooling Auxiliary cooling requirements are usually but not always met with separate fin-fan units. For a typical estimate of a plant requirement for an auxiliary cooling of 5 to 10% of the condenser heat load, an allocation of 7.5% of base price was added. This is consistent with the one other study in which the auxiliary cooling cost was broken out and discussed as a separate item. At one of the sites visited with an operating system (the Crockett Co-Generation facility), the auxiliary cooling was provided by extra cells on the ACC. Three of 15 cells, or 20% of the tower capacity, were dedicated to auxiliary cooling. This approach was characterized by one of the estimators as “quite costly” and represents more than the generally allocated amount. Additional Items A number of additional items, not included in the base price, are normally necessary for a complete, installed system. These include sensors and controls, finned surface cleaning equipment, fire and lightning protection, and finish painting. The costs are mostly minor with the exception of the sensors and controls. Several sources estimated the cleaning system as $100,000 to $150,000. 5-26PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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