An effective method of reducing the temperature gradient in data centers (or “hot” and “cold” spots) is to minimize the maximum temperature at the rack exit plane. For a given rack’s heat load, one way to achieve this is to vary the chassis flow rate in such a way that the rack exit temperature gradient is small. In this paper, a simple algorithm based on the energy equation is developed to set the chassis flow rate such that the exit rack temperature is uniform. When compared to a constant chassis flow rate algorithm, the proposed method is demonstrated through CFD simulations to achieve significant reduction in maximum chassis inlet temperature for the same CRAH flow rate.

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