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National Trust looks to tap into more water-source heat pumps, including its ornamental lakes

Following the success of its marine source heat pump in Anglesey, North Wales, the National Trust is looking at further water-source options, including its ornamental lakes.

The National Trust is looking at a range of water-source dedheat pumps, following the success of its installation of a marine source heat pump installatino at Plas Newydd in Anglesey. The 4x75 kW installation which takes water from the Menai Strait is currently operating with a COP of 4.06 against a design COP of 3.4, while saving £18,000 on the heating bill, against the previous oil-fired option.The key target of managing relative humidity has also been safely met by the installation, said the Trust’s heating specialist Paul Southall: “Our preventative conservation specialist was extremely pleased with theconsistent relative humidity across the property.”

The success of the operation has led to the Trust gaining approval to scope out other water-source options, which has led it to consider its properties’ ornamental lakes. Mr Southall said: “Many of our landscaped lakes are replenished by springs, so there is sufficient flow for a heat pump - the principle is the same as for a river or marine source heat pump.We are in talks with Castle Howard, for instance where the lakes are terraced.”

For the full story, see our Building Energy Focus supplement, on p12

The news comes hot on the heels of DECC launching its map of potential sources for water source heat pumps on its interactive heat map. The government believes that developers could access a potential 400 sources, from rivers to canals to estuaries to coastal sites. This, DECC said, ‘could heat one million homes.’


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