ENERGY REDUCTION SAINSBURY’S
Other carbon-saving measures at Leek has contributed to a 55% saving in operational carbon performance
In summer, heat from the store’s rooftop refrigeration plant is collected and used to reheat the ground. The ground’s temperature, at about 14°C,
has the advantage of creating a significantly lower condensing temperature for the store’s refrigerant circuit than ambient air. ‘We get about a 30% energy saving on the condenser because of the low ground temperature,’ says Hawker. The solution also means the store does not require a gas supply for heating. The technology is being used in new
stores, but Hawker says retrofitting on existing stores has been trialled and is on the agenda. ‘If we grow, to meet our targets, we’ve actually got to reduce the carbon emissions of our existing stores.’ He compares the scale of the task to an iceberg: ‘The new energy-efficient stores are the bit above the surface of the water, but the bulk of the existing estate is below,’ he says. Hawker says Sainsbury’s is considering generating its own energy using a low- carbon source, such as combined heat and power. Currently it generates a proportion of its electrical energy using PV panels: Hawker says it is the biggest multi-site
both heating and cooling. In winter, the main source of heating is the captured heat rejected by the rooftop refrigeration plant. Supplementary heating is provided by the heat pumps, which are connected
to a series of boreholes that extend up to 200m below
ground.The ground acts like a giant thermal storage battery. In winter, the heat pump draws heat from the ground to top up the space heating. A secondary circuit delivers the heated water from the heat pumps to the various air-handling units and domestic hot-water appliances.
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user of PV arrays in Europe, with about 100,000 panels installed on the roofs of supermarkets and distribution centres. There is still much more to be done, but
the engineering team’s strategy appears to be working: since 2005 the estate has grown by 23%, but total energy use has come down by 6%. Which means there’s just 24% to go before it hits its 30% reduction target in seven years. CJ
l Read about Sainsbury’s 20x20 sustainability plan at
www.j-sainsbury.co.uk/ responsibility/20x20/
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12/06/2013 11:43
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