About District Cooling >> Inside the Technology

How does it work?

An Inside Look at District Cooling

A TYPICAL SWAC DISTRICT COOLING SYSTEM IS QUITE SIMPLE AND CAN BE EXPLAINED IN FOUR PARTS
  1. Cold (44°F-45°F), deep water from more than 1,700 feet below sea level is pumped through an intake pipeline located more than four miles off the Kakaako shoreline to a cooling station on shore.
  2. The cold seawater is passed through a heat exchanger at the cooling station, which transfers the coldness to the freshwater that circulates in a closed loop pipeline system (district cooling). This chilled water (air conditioning service) is then provided to customer buildings. The heat exchangers ensure that seawater and the freshwater delivered to the buildings never mix. Chillers in the cooling stations supplements the cooling provided by the cold water to maintain a consistent 44°F for the chilled water distributed to customers' buildings.
  3. The chilled freshwater is provided to customer buildings through underground pipes that are connected to each building's existing chilled water air conditioning system.
  4. The seawater is returned in an environmentally safe manner back to the ocean and released through a diffuser.
inside the technology

 

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