A supply fan is operating at 30000 cfm and 4 inch of water with an efficiency of 50%. (a) Calculate the fan power at the current operating condition. (b) Calculate the pressure and power if the supply fan reduces its speed to deliver 20000 cfm.

The pressure and power of fan is 1.77 and 11.18 Hp respectively.

Explanation:

Given:

Discharge cfm

Pressure difference inch

Efficiency

(A)

From the formula of fan power,

      Hp

(B)

Fan power and pressure is given by,

We know that pressure difference is proportional to the square of discharge.

Fan power proportional to the cube of discharge.

        Hp

Therefore, the pressure and power of fan is 1.77 and 11.18 Hp respectively.

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.

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explanation: