Sea Water Air Conditioning

An aerial view of the NELHA facilities in Kona, Hawaii. Makai has installed undersea pipelines that descend to 915 m (3,002 ft) water depth at a temperature of 4° C (39° F).

Seawater Air Conditioning (SWAC) takes advantage of available deep cold water from the ocean, a river, or lake, to replace conventional AC systems.

SWAC feasibility studies for a variety of sites indicate that electrical consumption is typically reduced by 80 to 90 percent. Simple payback can be from three to seven years, and long term costs can be half that of a conventional air conditioning system.

Makai Ocean Engineering offers a full range of engineering services for seawater air conditioning analysis and implementation. Makai can provide technical and economic SWAC assessments, offshore surveys, environmental analysis, review of permit needs, deep water pipeline design, conceptual through final engineering design, cost estimates for construction and operation, and construction management.

Successful Past Projects:

  • NELHA: Kona, HI – 50 tons – 1987, 1993, 2001
  • Cornell University, NY – 20,000 tons – 1999
  • Toronto, Canada – 58,000 tons – 2001
  • Bora Bora, French Polynesia – 450 tons – 2006

Current Projects:

  • Downtown Honolulu, Hawaii
  • Curacao, Netherlands Antilles
  • Nassau, Bahamas
  • Reunion Island, Indian Ocean
  • Republic of Maldives, Indian Ocean