Kyoto cooling (Kyoto wheel)

KyotoCooling is an energy-efficient free cooling system for data centers. 

The KyotoCooling system uses a thermal wheel that supports air flow from one side to the other, separating inside and outside air streams. Heat is transferred to the outside air stream as the wheel rotates. Conduction cools the wheel in the outside air stream, and cool air is returned to the data center as the wheel continues to turn. The efficiency of transfer is very high.  

Although KyotoCooling supports both hot and cold aisle and chimney cabinet containment, the system can also be used in traditional non-containment designs.  Compared to the energy required by traditional computer room air conditioners, computer room air handlers and other traditional cooling methods, KyotoCooling uses between 75% and 92% less power. The system also reduces carbon dioxide emissions and eliminates the need for water. KyotoCooling systems can be installed relatively quickly and reduce the required footprint for cooling. 

In the United States, KyotoCooling is exclusively licensed by Air Enterprises of Akron Ohio. As of this writing, implementations include United Airlines, HP, Rogers Communications, Bell Canada & BendBroadband in North America. The technology and method are currently patented in thirty Countries. The name KyotoCooling, which was inspired by an international environmental treaty called the Kyoto Accord, is trademarked.

This video reports on an installation of KyotoCooling at the Baltic Data Center.