Friday, October 11, 2013

DataCenter CRAC Unit Pressure Drop


Engineering Brain Workout

     Eileen N. Walls is the Mechanical PM in charge of Data Center HVAC. She's been asked to estimate the pressure drop across an open floor tile 8 feet away from a new CRAC unit. Given that the CRAC unit puts out about 40,000 CFM, the raised floor system is about 1.5 feet deep, the initial air velocity from the CRAC is about 25 feet per second, and the static pressure at the CRAC outlet is measured to be 0.75 inches of H2O (gage), how could she approach this problem and what should her result be? (Hint: she only has a pencil and paper - no CFD)


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