BUILDING PERFORMANCE AWARDS CARBON CHAMPION
M&S has maximised natural light throughout the store
Mighty Oaks
energy load is attributable to refrigeration. Plan A has so far seen a cut in CO2 emissions from refrigeration by 60% thanks to fewer leaks and less harmful gases. ‘Obviously, HCFC gases like R22 are being phased out, but we are also committed to moving away from less harmful HFC gases by 2030. ‘All new stores and major refurbishments as a refrigerant – with huge
now use CO2
carbon benefits from its lower global warming potential as well as energy benefits.’ M&S is exploring issues such as
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Winner of both the New Build Project of the Year (value over £10m) and Carbon Champion awards at this year’s CIBSE Building Performance Awards, the judges felt that: ‘Marks & Spencer’s Cheshire Oaks store demonstrates what the private sector can achieve on a voluntary basis.’ Cheshire Oaks is the latest of Marks & Spencer’s Sustainable Learning Stores. Among its many low energy features are: The building is partly sunk into the ground with earth mounding around the perimeter to help keep a stable temperature by improving the building’s insulation
Free cooling air is delivered to sales floors via displacement air columns and below-ground air distribution ducts
A biomass boiler plant – combined with the reclaimed heat from the food refrigeration system – is predicted to deliver approximately 70% of the store’s heating demand
Use of natural daylight and LED lighting – M&S has maximised natural light throughout the store, and sales floor lighting has automated daylight control that dims the lamps when possible
A carbon manager is employed to undertake a life-cycle evaluation of Cheshire Oaks, as well as quantify total carbon reduction
All electricity is provided via a green electricity supply contract.
M&S targeted carbon reductions of 34% and energy reductions of 29% when compared with a benchmark store. Monitoring of the building under the Technology Strategy Board’s Building Performance Evaluation programme has found it to be 42% more energy efficient, with 40% lower carbon emissions per square foot. The use of highly innovative building materials, such as hempcrete, and its exceptional airtightness (70% better than required by Building Regulations) has resulted in the store using 60% less heating fuel than predicted. HVAC consumption is also some 14% of the total electrical consumption. The evaluation from Faithful & Gould said:
‘From our independent assessment, it genuinely stands out as the best building – both in terms of its energy performance and user satisfaction – from the many we have seen. It should be viewed as a template for others in the industry to emulate.’
March 2014 CIBSE Journal 37
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