Spotlight on solar air heating

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Andrew Brewster leads the Renewables Design Team for the CA Group – a specialist building envelope manufacturer and installer. In this guest post, he puts one of the lesser-known solar technologies under the spotlight:

Solar air heating is a proven technology that has been developed specifically for heating large spaces. With high-profile advocates including The Royal Mail, Marks & Spencer and Jaguar Land Rover, the technology is increasingly expected to become part of the sustainability strategy of those companies leading the charge for environmental responsibility.

Harnessing sunrays to heat large spaces

What is solar air heating?
Solar air heating works by harnessing the sun’s energy via a Transpired Solar Collector (TSC), or SolarWall®. The SolarWall® technology pre-heats fresh, outside air, which is then actively drawn into the building’s heating system, contributing considerably to a reduction in the need for fossil fuels.

The technology is 100% renewable and has the effect of dramatically reducing a building’s overall heating requirement, providing significant savings in energy consumption and carbon emissions.

SolarWall® in action
CA Group recently installed the world’s largest SolarWall® on a single building for Marks & Spencer, at the retail giant’s 80,000m² East Midlands Distribution Centre (EMDC) in Castle Donington. The 4,500m² Transpired Solar Collector is expected to reduce the building’s heating requirement by somewhere in the region of 30%, by generating more than 1,135,000kWh and saving over 256t of CO2 per annum.

The SolarWall® can be seen in action at the Jaguar Land Rover training academy in this video:

The benefits
The revolutionary solar air heating system has the lowest capital cost and the highest known efficiency of any active solar technology in the world (up to 80%), generating in excess of 500 Watts of thermal energy per square meter on a clear day [Dr. Chuck Keutcher, U.S. National Renewable Energy Laboratory (NREL)].

It also offers the quickest return on investment, with an estimated payback period of three years on new build and eight years on retrofit applications. So as well as being an excellent option from an environmental perspective, it is also one that makes good commercial sense.

Global recognition
SolarWall® has been available for almost 30 years and is used in over 35 countries globally. A number of companies have tried to emulate the system but, due to a lack of understanding and third-party testing, they have been unable to replicate SolarWall®’s level of system performance.

In the UK, as part of its ongoing development and accreditation, the technology has received the independent endorsement of five leading authorities: Oxford Brookes University, the Welsh Assembly, Cardiff University, BSRIA and BRE.

CA Group has seen a significant uptake in the technology because of the very tangible results it delivers. As awareness of the technology’s capabilities increase, the Group anticipates that solar air heating will become part of the sustainability strategy of more and more companies looking for cost-effective ways of making the biggest impact on their CO2 emissions.

CA Group’s interactive Renewables Guide offers further information on solar air heating and other renewable options geared towards the generation of power and heat for commercial, industrial and distribution centres.

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