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Comparative Cost Analyses • The Mountain and Valley sites have temperature duration curves that are very similar in spite of their widely different locations and environment. • While the general shape of the Mountain and Valley curves are also similar to that of the Desert curve, they differ from the Desert profile importantly at the high temperature periods. Both exhibit a sharp drop in the number of hours above a certain temperature at about 80°F. As a result, the hours during which they incur large heat rate or capacity penalties are substantially less than at the Desert site (less than half as many hours above 90°F, for example). As a result, the cost curves corresponding to those displayed for the Desert site in Figures 5-26 and 5-27 would have similar shapes at the low ITD end, and the location of the minima would be nearly the same. However, they would not exhibit the sharp upturn at the high ITD end since the penalties associated with the choice of smaller ACCs would be far less. Therefore, the selection of a unit with an ITD in the range of 40oF would be appropriate for all three sites, but the consequences of choosing a lower first cost unit would be less at the Mountain or Valley sites than at the Desert site. • The Bay Area site exhibits a very different climate. Over 8000 hours are below 70°F. This essentially eliminates the influence of the heat rate and capacity penalties in the selection of the optimum unit and suggests that the choice of a lowest first cost ACC would be appropriate. 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 40 50 60 70 80 90 100 110 Ambient Temperature, deg F Figure 5-28 Site Temperature Profiles The cost breakdown for a chosen ACC at the Valley site is tabulated in Table 5-17 (system designed for 2.5 in. Hga at average seasonal temperature and humidity, Tavg. dry bulb = 67°F; Tavg. wet bulb = 6 °F). The capital cost, fan power, and total evaluated cost for each of the four sites are shown in Table 5-18. Desert Mountain Valley Bay 5-38 Hours above Tamb, hr.PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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