A water pump increases the water pressure from 15 psia to 70 psia. Determine the

Daniell Phillips 2021-12-15 Answered
A water pump increases the water pressure from 15 psia to 70 psia. Determine the power input required, in hp, to pump 0.8 ft^3/s of water. Does the water temperature at the inlet have any significant effect on the required flow power? Answer: 11.5 hp
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Expert Answer

Cleveland Walters
Answered 2021-12-16 Author has 40 answers
Given:
p1=15ψa
p2=70ψa
V˙ol=0.8ft3s
Solution:
Note: m˙=ρ×V˙ol(asgcoressibflowρ=const)
The total change in the system mechanical energy can be calculated as follows,
e=p2p1ρ
The power needed can be calculated as follows,
P=W˙=m˙=ρ×V˙ol×p2p1ρ=V˙ol×(p2p1)
=44(ψaft3s)=44(ψaft3s)×(1Btu5.404ψaft3)(×1hp0.7068Btus)=11.52hp
Finally answer: P=11.52hp

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