Eurex helps Marks & Spencer reduce air-conditioning costs
Eurex Energy is revamping air conditioning for Marks & Spencer stores to reduce energy consumption. This installation is at Kirkaldy.
As part of the campaign by Marks & Spencer to become carbon neutral within five years, Eurex Energy has supplied Airvolution low-energy air-conditioning systems to several stores. Eurex installed and commissioned the systems, which required remodelling the existing air-distribution system from total loss to supply-and-extract air distribution, with energy being reclaimed from the extract air. It is common for retail stores to be served by fresh-air systems, with the conditioned air being driven out through the main doors into the street. The Airvolution system uses a modern air-handling unit with low-energy features such as variable-speed backward-curved plug fans fitted with high-efficiency EFF1 motors. The high-efficiency thermal wheel recovers over 80% of the energy in the extract air, reducing both heating and cooling costs. The AHU is matched with air conditioning such as direct expansion, either incorporated or as a separate component sited adjacent. Integrated controls ensure that the most efficient use is made of the recovered energy by operating as a constant supply temperature system. Air volumes are controlled by inverters to achieve the design supply temperature before switching in further cooling or heating. For much of the year. there is little need for additional fuel. A display screen enables the client to change fan speed and access working profiles such as temperatures, room humidity, carbon-dioxide levels, efficiency of the thermal wheel and filter condition.
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