A cooling pond is a man-made body of water primarily formed for the purpose of cooling heated water or to store and supply cooling water to a nearby power plant or industrial facility such as a petroleum refinery, pulp and paper mill, chemical plant, steel mill or smelter.
Overview
Cooling ponds are used where sufficient land is available, as an alternative to
or discharging of heated water to a nearby
river or
coastal waters, a process known as “once-through cooling.” The latter process can cause thermal pollution of the receiving waters.
Cooling ponds are also sometimes used with
HVAC in large buildings as an alternative to cooling towers.
The pond receives thermal energy in the water from the plant's condensers during the process of energy production and the thermal energy is then dissipated mainly through evaporation and convection.
A 1970 research study published by the U.S. Environmental Protection Agency reported that cooling ponds have a lower overall electrical cost than while providing the same benefits. The study concluded that a cooling pond will work optimally within 5 degrees Fahrenheit of natural water temperature with an area encompassing approximately 4 acres per megawatt of dissipated thermal energy.
Examples
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Lake Anna is a cooling pond in Virginia, which provides cooling water for the North Anna Nuclear Generating Station. This pond has recreational uses such as fishing, swimming, boating, camping, and picnicking as well as being a cooling pond for the nuclear plant.
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The cooling pond at the Chernobyl Nuclear Power Plant (Pripyat, Ukraine) has abundant wildlife, despite the radiation present in the area. There are some accounts of wels catfish (Silurus glanis) growing up to 350 pounds and having a lifespan of up to 50 years in the area.
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The Columbia Energy Center in Pacific, Wisconsin is a coal fired power plant with a capacity of 1000 MW. A dual cooling system is used for heat rejection that consists of a cooling pond and two cooling towers. The pond and towers are connected in a parallel arrangement to help dissipate thermal energy at expedited rates.
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In 1994 the reactor at Yongbyon Nuclear Scientific Research Center, North Korea, was under U.S scrutiny and its nuclear fuel rods were taken out of the reactor and placed in the facility's cooling pond.
[, BBC News, 16 July 2007]
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At the 2.05 MW Ashford A power station Kent, UK, cooling water for the oil-fired engines was obtained from, and returned to, cooling water ponds.
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At the 89 MW Back o’ the’ Bank power station in Bolton UK the cooling water was cooled in 4 spray ponds.
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In 1963 the UK's Central Electricity Generating Board (CEGB) was researching the possibility of using warmed cooling water from power stations to support fish-farming both for recreational use and for food. At Grove Road power station in London water was cooled in wooden natural draft cooling towers and fell into cooling water ponds. The CEGB introduced carp (Common carp), grass carp, silver carp and Tilapia into the cooling water ponds; the fish grew rapidly in the warm water (up to 27 °C).
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Zaporizhzhia Nuclear Power Plant, Ukraine, has massive cooling ponds with additional water spray.
See also
