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Wednesday, February 18, 2009

Eco Homes-zero carbon homes.

The terms eco home refers to zero carbon homes. The term "eco home" is now so used and abused that it barely retains any trace of meaning.
This house, in Crossway, Kent, is one of the first zero-carbon homes in the UK. It was designed by architect Richard Hawkes, who will be its first occupant, with structural design by Michael Ramage and Philip Cooper – both based at the University of Cambridge's Department of Architecture.What sets it apart is its structural reliance on a large vaulted roof which spans 20m. Much of the house is covered in earth to aid insulation and help it to blend into its rural setting. The earliest known example of "Catalan vaulting" – the forebear of timbrel vaulting – is a building in Valencia dating back to 1382 and it is a very resource-efficient way of creating a strong, expansive roof.
A zero-carbon home which could become a template for more houses in the UK is to be unveiled in Kent. The four-bedroom property, called 'Crossway', situated near Staplehurst, uses a technique borrowed from 600-year-old medieval architecture to provide what may prove a blueprint for energy-efficient living in the future
But it is intriguing to know that it claims to draw on centuries-old ideas, such as timbrel vaulting. It has often struck me when talking about how we might green up our housing stock just how often the solutions can be found by thumbing through the history books. Much of what is prescribed – insulation, insulation, and a bit more insulation – isn't exactly rocket science.
Our ancestors realised all this long ago, but as fuel becomes ever more available and affordable we largely lost the need to care about wasting energy in our homes. However, things are fast changing and we need to urgently rethink how we use and save energy at home. After all, households account for 27% of the UK's carbon emissions.
"The vaulting gives the house plenty of structural strength but obviates the need for embodied-energy intensive materials such as reinforced concrete," says Dr Michael Ramage, who helped to design the home. He is an architectural designer based at the University of Cambridge's Department of Architecture with expertise in structural design and construction technology. "It also provides it with great thermal mass, enabling the building to retain heat, absorb fluctuations in temperature and reducing the need for central heating or cooling systems," adds Ramage.
The UK's first example of a combination photovoltaic and thermal heating system has been installed alongside an 11kW biomass boiler to provide the home's heating and power needs.

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