A 24-in-diameter fan operating at 1,750 rpm produces an air flow of 150 and a pressure head of 7 in of water. At a speed of 1,650 rpm the efficiency and air flow pattern remain the same. What is the flow rate and head at 1,650 rpm?
2. A 24-in-diameter fan operating at 1,750 rpm produces an air flow of 150 /s and a pressure head of 7 in of water. It is desired to build a larger fan that will deliver the same head but at the lower speed of 1,650 ‘pm. What should be the diameter of this larger fan, and what will be the delivered flow rate?
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