Engineering and cost analysis of a dry cooling system augmented with a thermal storage pond Page: 21 of 102
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AN ENGINEERING AND COST ANALYSIS OF A DRY COOLING
SYSTEM AUGMENTED WITH A THERMAL STORAGE POND
1.0 INTRODUCTION
The study described in this report was performed as part of the U.S.
Department of Energy's Dry Cooling Enhancement Program at the Pacific
Northwest Laboratory (PNL). The objective of the study was to determine the
potential for reducing the high cost associated with all-dry cooling of steam
electric power plants by using capacitive thermal storage ponds.
1.1 SCOPE
This report documents the engineering and cost analysis of an all-dry
cooling system operating in conjunction with a thermal storage pond. The
all-dry cooling system is assumed to be a state-of-the-art system using metal
finned tubes. The thermal storage pond is included to provide energy storage
that allows more efficient plant operation throughout the daily ambient
temperature cycle.
Two types of thermal storage ponds have been proposed, a covered pond and
an uncovered pond. The uncovered pond has the added effect of heat rejection
(by evaporation) from the surface and heat absorbtion (by radiation and
conduction) to the surface. In this study only covered ponds were considered
because an uncovered pond is no longer an all dry system but must now be
considered a dry/wet system. The storage pond will undergo an additional
diurnal change in heat content because of interaction with the surroundings
(i.e., sun and atmosphere) and will function in a manner similar to a
conventional cooling pond in series to a dry tower. Thus the cost
effectiveness of an uncovered pond must be compared with a logical alternative
approach to dry/wet cooling, e.g., an evaporative cooling tower in conjunction
with dry cooling. A further parallel may be drawn with the comparative1
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Drost, M.K. & Allemann, R.T. Engineering and cost analysis of a dry cooling system augmented with a thermal storage pond, report, September 1, 1978; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1207259/m1/21/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.