In Fig. 1, the box-fan of weight 22 N is hovering in the air. The air approaches the blades from the top with a negligible velocity and leaves the blades at a uniform velocity at the atmospheric pressure. The diameter of the blade span area is 0.9 m. Determine (a) The air exit velocity to produce 22 N force. (b) The volume flow rate needed. (c) The minimum power that must be supplied to the airstream. Take the air density to be 1.25 kg/m3 .
In Fig. 1, the box-fan of weight 22 N is hovering in the air. The air approaches the blades from the top with a negligible velocity and leaves the blades at a uniform velocity at the atmospheric pressure. The diameter of the blade span area is 0.9 m. Determine (a) The air exit velocity to produce 22 N force. (b) The volume flow rate needed. (c) The minimum power that must be supplied to the airstream. Take the air density to be 1.25 kg/m3 .
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter1: Heat, Temperature, And Pressure
Section: Chapter Questions
Problem 17RQ: Convert 22C to Fahrenheit.
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In Fig. 1, the box-fan of weight 22 N is hovering in the air. The air approaches the blades
from the top with a negligible velocity and leaves the blades at a uniform velocity at the
atmospheric pressure. The diameter of the blade span area is 0.9 m. Determine
(a) The air exit velocity to produce 22 N force.
(b) The volume flow rate needed.
(c) The minimum power that must be supplied to the airstream.
Take the air density to be 1.25 kg/m3
.
Transcribed Image Text:↑ F
Air
Fig. 1
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