Abstract
We have been developing high efficient liquid cooling system in the high heat density data centers and telecommunication buildings. The cooling system cools CPU by liquid, and transfers heat from CPU to outside. The cooling device in this system is required to be high-efficient and applied to multi-CPU. Then, we propose a natural circulation type cooling device having multiple evaporators for multi-CPU. This device transfers heat from CPU to rack and exchanges heat with cooling device outside rack. The design conditions and effectiveness of this cooling device are examined. Flow fields in this cooling device which is changed by the amount of heat are clarified by thermo fluid simulation.
