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Sub-Ambient Cooling System Overview
Keywords: Datacenter Cooling, Liquid Cooling, Two-phase Cooling
Raytheon has successfully demonstrated a new type of cooling system for next generation, high power military radar systems. Cooling energy requirements decreased by up to 90% as compared to usage of a vapor cycle system. The new cooling system uses water or water/antifreeze mixtures as a two-phase coolant in an evaporative closed loop that operates at an actively controlled, reduced pressure level thus reducing the boiling point of the coolant. Operation is similar to that of a large pump-assisted heat pipe that can extend for hundreds of feet and transfer mega-Watts of heat. A number of new applications for this new type of cooling system have been identified through continuing research and development efforts for homeland security and defense systems. One commercial application that has become known is the cooling of data centers and servers while minimizing cooling energy requirements and allowing more densely packaged servers. The goal is developmental efforts for cooling of data centers based on this new cooling system leading to the elimination of CRAC units with their associated refrigeration cycle. With proper design and development of server electronics using boiling heat transfer, fans in the server racks can be eliminated further improving system COP while, at the same time, allowing the electronics to be packaged more densely by exploiting the high heat flux capability of two-phase heat transfer. Cooling of data centers and servers is an exciting area of technology and we believe the Sub-Ambient Cooling System (SACS) can be applied to this application.
Gerald Wyatt, Senior Fellow
McKinney, TX

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