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The heat-generating servers are kept at the right temperature by pumping cool air up into the 'cold aisles' that they sit either side of.
"There's a fan like you have on a PC that pulls the hot air out the back of the server while pulling the cold air in through the front to keep the server cool," said Watkins.
The hot air is extruded out of the back and rises towards the ceiling by convection. It eventually gets sucked back into one of the air conditioning units and is transported to the large cooling units outside the warehouse where it is cooled down again.
Again, the sites has 'N+1' cooling units, so there are four but only three are needed at any one time for operation.
When Enfield air temperatures are below a certain threshold the pumps will use the water's natural temperature to avoid expending unnecessary energy.
Image: Sam Shead