Energy conservation(cont.)

Examples: Determine the efficiency of the pump if the power input of the motor

is measured to be 1.5 hp. It is known that the pump delivers 300 gal/min of water.

pump

Z=15 in

1

2

Mercury (?m=844.9 lb/ft3)

water (?w=62.4 lb/ft3)

1 hp=550 lb-ft/s

hE=hL=0, z1=z2

6-in dia. pipe

4-in dia.pipe

Q=300 gal/min=0.667 ft3/s=AV

V1=Q/A1=3.33 ft/s

V2=Q/A2=7.54 ft/s

zo

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