miller60 writes "An air conditoning technology called the heat wheel is getting a test drive in data centers, and early adopters cite impressive reductions in their power bills. The heat wheel — also known as a rotary heat exchanger or Kyoto Cooling — is a refinement of cooling systems using outside air. Rather than introducing exterior air directly into the server room (air economization), the heat wheel briefly mixes the outside air and exhaust air to create an air-to-air heat exchanger. KPN is using this approach in a data center in the Netherlands, and says it only has to use chillers 11 days a year." Link to Original Source
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