Patent ID: 7753766

Claim:
A data center, comprising: an air humidity- and temperature-conditioned space in a building where heat producing ICT and/or telecom equipment is arranged, the ICT and/or telecom equipment having an operating temperature; a primary data center cooling means, the primary data center cooling means comprising a substantially sensible only heat exchange heat wheel cooling a first re-circulated air stream heated by the equipment to a cooling temperature at or below the operating temperature using a second separate airstream at a temperature less than or equal to the cooling temperature minus a predetermined temperature difference without any additional cooling device, the primary data center cooling means comprising no refrigerant or liquid-based cooling; and a secondary data center cooling means supplementing the primary data center cooling means when the second air stream is at a temperature greater than the cooling temperature minus the predetermined temperature difference to cool the first re-circulated air stream to the cooling temperature, wherein the primary data center cooling means is configured to cool the first re-circulated air stream to the cooling temperature without any additional cooling device whenever the second air stream temperature is less than or equal to the cooling temperature minus the predetermined temperature difference.