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the range, the hybrid system is less expensive than conventional wet plus dry. (Note that the economic parameters used in this analysis differ from those used in producing Figures 2-1 and 2-2, thus leading to differences in absolute generating costs.) 2.2 Design and Optimization of Recirculating Cooling Ponds Cooling ponds are large, artificially constructed, water bodies used for closed-cycle dissipation of power plant waste heat. While there are areas of the country where cooling ponds have been widely used (e.g. Texas and Illinois), their use has been restricted by the relatively poor state-of-the-art in predicting cooling pond performance (e.g. relative to that of wet towers). This difficulty is created by the complex cir- culation patterns found in a pond and by the highly transient response of a pond to time-varying meteorology. As a consequence of past difficulties in simulating performance of a given pond, there have been few established guidelines for the design (optimization) of ponds. Existing guidelines are based on very simple, usually steady state, hydrothermal models. Over the past years the Ralph M. Parsons Laboratory of the Depart- ment of Civil Engineering at MIT has been engaged in the development and application of mathematical models to study the hydro-thermal per- formance of cooling ponds and lakes (Ryan et al., 1973; Watanabe et al., 1975; Jirka et al., 1977; and Jirka et al., 1978). The object of the present effort has been to synthesize information from these models in order to develop a rational cooling pond design methodology. The specific 41PDF Image | WASTE HEAT MANAGEMENT IN THE ELECTRIC POWER INDUSTRY
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