Cold during the day is worth much more than cold at night. So it makes sense to store cold at night and use it during the day. A large, layered cold buffer is being built at the University of Twente.
 
Cold circle for the Education and Research Centre at the University of Twente

On the campus at the University of Twente, Royal Haskoning is working on a cold circle, a new system that will be able to cool the Education and Research Centre buildings extremely efficiently. It is based on a deep, round basin on the campus site, with a capacity of 10,000 m³, which acts as a cold buffer and has a ring main running from it through the buildings. In the summer months good coordination with the existing air-conditioning units will cope with the anticipated peak load of 11 MW.

The system makes the best use of the temperature difference between night and day. The cold is stored in layers in the water, where the temperature difference between the top and bottom layers is eight to ten degrees. This is enough to make a considerable saving in air-conditioning and electricity, because the demand varies greatly whereas the ‘generation’ of cold can be spread over the entire twenty-four hour period. Because most electricity will be used at night and the reservoir will also used for the sprinkler systems, this creates an economically attractive combination.



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