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University of Arizona (1971)

Power plant heat rejection in an arid climate

Scofield, Frederic Cook

Titre : Power plant heat rejection in an arid climate

Auteur : Scofield, Frederic Cook,

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1971

In an arid climate the consumptive use of water by a steam power plant may place a constraint on the plant size and location, and may affect the choice of nuclear or fossil fuel. Lack of a firm water supply for cooling tower makeup may necessitate a reservoir, which then could be used as a cooling pond. A review is made of the factors affecting power plant siting in Arizona. An investigation is then conducted of the factors affecting the ability of a cooling pond to dissipate an imposed heat load. Appropriate mathe matical models of cooling towers, ponds, and spray systems are developed based on meteorological phenomena. The evaporation from cooling towers and spray systems is calcu lated using the heat and mass balance method. The monthly evaporation, using Arizona climatological data, is computed for various design criteria and operating conditions. The use of a spray system to provide supplemental cooling during summer months to reduce the required pond area is investi gated. The results indicate that the total evaporation will be highest for a cooling pond, but the use of a supplemental spray system reduces the annual evaporation by approximately 20 per cent from that of a cooling pond designed for summer conditions.


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