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WASTE HEAT MANAGEMENT IN THE ELECTRIC POWER INDUSTRY

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WASTE HEAT MANAGEMENT IN THE ELECTRIC POWER INDUSTRY ( waste-heat-management-inelectric-power-industry )

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from use of gas turbines devoted exclusively to the task to total replacement by purchase of electricity at elevated costs per kilowatt hour. The effect of each option on the economic optimization of the plant-cooling system has been documented. A major conclusion s that tlhe optimal tower size can be significantly decreased, thus reducing both capital and total production costs if a utility is able to purchase peak power. (see Figure 2-1). The optimization program has also been modified to facilitate examination of wet/dry systems. Evaluations have been performed to determine the minimum cost system for a given yearly water consumption constraint (see Figure 2-2). The optimization is performed in considera- tion of detailed tower and water distribution designs and methods of accounting for lost capacity. This approach differs from that under- taken by others (e.g., U.E.&.C., 1976) who base their optimization on pre- designed tower modules. Finally, a study of MIT's hybrid wet/dry system (Curcio, et al., 1975) has been made. This design uses a modified fill in essentially a wet cooling tower to increase the ratio of sensible to latent heat transfers. Since the new design does not require a conventional dry surface, it should be easier to employ than a conventional wet piLs dry and in addition the reduced relative humidity of he exhaust air is always low enough to preclude the formation of visible fog plulmes. Figure 2-3 plots the operating cost of the hybrid system as a function of make-up water requirements indicating that, over a wide portion of 37

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WASTE HEAT MANAGEMENT IN THE ELECTRIC POWER INDUSTRY

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