Cooling pond

A cooling pond is a man-made body of water primarily formed for the purpose of cooling heated water and/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.

This article is about artificial outdoor ponds supplying cooling water for power plants and factories. For storage of spent nuclear fuel (usually but not always indoors), see spent fuel pool.
Mount Storm Lake is a 1,200 acres (4.9 km2) cooling pond for a coal synfuel power plant in Grant County, West Virginia.

Overview

Cooling ponds are used where sufficient land is available, as an alternative to cooling towers or discharging of heated water to a nearby river or coastal bay, a process known as “once-through cooling.” The latter process can cause thermal pollution of the receiving waters.[1][2] Cooling ponds are also sometimes used with air conditioning systems in large buildings as an alternative to cooling towers.[3]

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.[4][5] Once the water has cooled in the pond, it is reused by the plant. New water is added to the system (“make-up” water) to replace the water lost through evaporation.

A 1970 research study published by the U.S. Environmental Protection Agency reported that cooling ponds have a lower overall electrical cost than cooling towers 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.[4]

Examples
  • 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.[6]
  • 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.[7]
  • 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.[8]
  • 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.[9] The fuel rods have since been removed.[10]
  • 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.[11] The principal cooling mechanism in the ponds was by convection from the water surface.
  • At the 89 MW Back o’ the’ Bank power station in Bolton UK the cooling water was cooled in 4 spray ponds.[12] The small size of the spray droplets improved the heat transfer, increased evaporation, and led to more effective cooling. Each cooling pond had a capacity of 0.75 million gallons per hour (0.95 m3/s).[12] Make up water was abstracted from the nearby River Tonge. In about 1950 a hyperbolic reinforced concrete cooling tower was built with a capacity of 2.5 million gallons per hour (3.15 m3/s), with cooling range of 15°F (8.3°C).[12] However, there were complaints that operation of the cooling tower let to problems with ice in cold weather as water vapour from the tower froze as fine particles. [13]

See also

References
  1. Mongillo, John F.; Zierdt-Warshaw, Linda (2000). Encyclopedia of Environmental Science. Rochester, NY: University of Rochester Press. p. 93. ISBN 978-1-57356-147-1.
  2. Dunne, Thomas; Leopold, Luna B. (1978). Water in Environmental Planning. New York: W.H. Freeman. p. 722. ISBN 978-0-7167-0079-1.
  3. Ananthanarayanan, P.N. (2005). Basic Refrigeration and Air Conditioning. McGraw-Hill. p. 218. ISBN 978-0-07-049500-5.
  4. An Engineering-Economic Study of Cooling Pond Performance (Report). Washington, DC: U.S. Environmental Protection Agency (EPA). 1970. p. 5. 16130DFX0570. Water Pollution Control Research Series.
  5. Bengtson, Harlan. "Power Plant Condenser: Wet Cooling Tower, Pond, Air Cooled". Energy & Power Plants. Troy, New York, US: Bright Hub, Inc. Retrieved 2018-12-30.
  6. "North Anna Waste Heat Treatment Facility". Dominion Resources, Inc. Archived from the original on 2015-04-06. Retrieved 2015-01-26.
  7. "Yes, there are giant catfish in Chernobyl's cooling pond – but they're not radiation mutants". Earth Touch News Network. Bethesda, Maryland, US. Retrieved 2018-10-25.
  8. Joerg, Kirchhoff (1995). "Optimized Combination of a Cooling Pond and Cooling Tower System for Condenser Cooling at a Steam Cycle Power Plant". College of Engineering, University of Wisconsin—Madison. Masters' Thesis.
  9. Gordon, Michael R. (1994-06-24). "Korean Talks: Looking for Options". New York Times.
  10. "UN confirms N Korea nuclear halt". Archived from the original on 27 August 2007. Retrieved 30 December 2018., BBC News, 16 July 2007
  11. "Ashford Electricity Works". Chapman family history. Retrieved 5 June 2020.
  12. Garrett, Frederick C. (ed) (1959). Garcke's Manual of Electricity Supply vol. 56 1958-59. London: Electrical Press. pp. A-36.CS1 maint: extra text: authors list (link)
  13. Bolton News. "Ice from cooling tower". Bolton News. Retrieved 5 June 2020.
  14. Information, Reed Business (31 January 1963). "Cultivating fish for food and sport". New Scientist. Retrieved 5 June 2020.
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