Sea water air conditioning

Short description: Alternative cooling system

Sea water air conditioning (SWAC), also known as ocean water cooling, is an alternative cooling system that uses the deep cold seawater as the chilling agent for a closed-loop fresh water distributed cooling system. Once installed, SWAC systems typically operate at approximately 15% of the power consumption of conventional chillers. A SWAC system basically consists of deep seawater intake and return pipelines, titanium heat exchangers, seawater and freshwater pumps, and a distribution system for the chilled fresh water.[1]

## Seawater air conditioning installations

Seawater pipes of The Excelsior hotel system in Hong Kong.

The InterContinental Resort and Thalasso-Spa on the island of Bora Bora uses a seawater air conditioning (SWAC) system to air condition its buildings. The system accomplishes this by passing cold seawater through a heat exchanger where it cools freshwater in a closed loop system. This cool freshwater is then pumped to buildings and is used for cooling directly–no conversion to electricity takes place. Similar systems are also in place in The Excelsior hotel[2] and The Hong Kong and Shanghai Banking Corporation main building in Hong Kong, and at the Natural Energy Laboratory of Hawaii Authority.[3][4]

Salt water air conditioning systems have been used in Sydney's Circular Quay and prominent buildings within the harbour since the rise of commercial air conditioning systems in the 1960s. These include the heritage-listed AMP 'Palm Cove' Building (constructed 1962) and the Sydney Opera House. [5][6]

The InterContinental Resort is the largest seawater air conditioning system to date, though there are several other, larger systems being planned.[7] Honolulu Seawater Air Conditioning was a project intended to use seawater air conditioning to deliver renewable cooling to commercial and residential properties in the downtown Honolulu area.[8][9] On December 19, 2020, Honolulu Seawater Air Conditioning announced it was ending its development and would end operations by the end of January 2021.[10] Honolulu Seawater Air Conditioning is majority owned by eBay founder Pierre Omidyar's Ulupono Initiative.[11]

Seawater air conditioning systems have been considered for US Naval Base Guam,[12] and for hotels near Tuamon Bay.[13]

## See also

* Deep Lake Water Cooling System
* District cooling

## References

1. ↑ "Sea Water Air Conditioning". NAVFAC Tech Data Sheet TDS-CIOFP 1401: 1. 2013. https://www.navfac.navy.mil/content/dam/navfac/Specialty Centers/Engineering and Expeditionary Warfare Center/PDFs/ciofp_tech_data_sheets/TDS-CIOFP-1401.pdf.
2. ↑ Wong, Yiu-ming (1998). Biofouling treatment of seawater cooling systems in Hong Kong (M.Sc. in Environmental Management thesis). University of Hong Kong. doi:10.5353/th_b4257477.
3. ↑ "Seawater/Lake Water Air Conditioning (SWAC/LWAC)". Ocean Thermal Energy Corporation. https://otecorporation.com/swac-2/.
4. ↑ Galbraith, Kate (2009-04-30). "Using Seawater for Air-Conditioning" (in en-US). https://green.blogs.nytimes.com/2009/04/30/using-seawater-for-air-conditioning/.
5. ↑ "AMP Building". https://sydneylivingmuseums.com.au/sydneyopen/2019/amp-building.
6. ↑ "Lend Lease looks to Sydney Harbour for water cooling at Barangaroo" (in en-AU). November 20, 2012. https://www.thefifthestate.com.au/articles/lend-lease-looks-to-sydney-harbour-for-water-cooling-at-barangaroo/.
7. ↑ "The Basics of Seawater Air Conditioning Explained". https://www.youtube.com/watch?v=_iFaTYpGYM8.
8. ↑ Lincoln, Mileka (6 August 2013). "$1M local investment in Honolulu Seawater Air Conditioning". https://www.hawaiinewsnow.com/story/23053163/1m-local-investment-in-honolulu-seawater-air-conditioning/.
9. ↑ Chino, Mike (2009-12-08). "Deep-Seawater Air Conditioning System to Cool Honolulu" (in en-US). https://inhabitat.com/deep-seawater-air-conditioning-system-to-cool-honolulu/.
10. ↑ "Honolulu Seawater Air Conditioning to end development after 15 years". https://www.bizjournals.com/pacific/news/2020/12/19/honolulu-seawater-air-conditioning-end-development.html.
11. ↑ Shimogawa, Duane (March 24, 2015). "Honolulu Seawater A/C project clears federal environmental hurdle". Pacific Business News. https://www.bizjournals.com/pacific/blog/morning_call/2015/03/honolulu-seawater-a-c-project-clears-federal.html.
12. ↑ Crisson, Kevin (2014). "Sea water air conditioning (SWAC) at Naval Base Guam: cost-beneit analysis and acquisition strategy". https://core.ac.uk/download/pdf/36736674.pdf.
13. ↑ Makai Ocean Engineering, Inc. (2006). "A Technical and Economic Feasibility Assessment of a Deep Sea Water District Cooling System at Tumon Bay, Guam". http://www.guampowerauthority.com/gpa_authority/strategicplanning/documents/ExecutiveSummary.pdf.

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