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Heat Sources & Collectors

Sea Water

All at sea

Sea water source heat pumps are ideal for buildings close to the shoreline and marine vessels.

Kensa’s very first heat pump in 1999 was designed to be installed on board a boat and uses sea water as the energy source. Indeed, all Tamar Class RNLI lifeboats have Kensa heat pump systems on board to keep the crew comfortable in high or low temperature conditions

Many RNLI life boat stations also use Kensa sea water sourced heat pumps to heat the buildings.

 

Sea water collectors

Typically sea water collectors take the form of closed loop Kensa pond mats constructed of slinky pipe attached to corrosion resistant stainless steel frames which are sunk to the bottom of the water source, however open loop methods can be employed, although consideration of the corrosive nature of saltwater on the ground source heat pump should be considered if open loop is to be used.

Pond mats are typically utilised to extract the heat from sea water sources, however methods using boreholes and submerged ‘open loop’ pipework are also used to great success.

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Water works

Sea water source heat pumps have a number of advantages:

  • The heat transfer rate from water is higher than that in the ground;
  • The water is in close contact with all of the pipe at all times enhancing it’s efficiency;
  • The flow/circulation of water provides constant energy replacement;
  • The use of a water source removes the need for digging or drilling, reducing the cost and duration of the installation;
  • The return temperature to the heat pump is generally 5-6°C higher than ground collectors, increasing the efficiency of the heat pump.

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