(a) Water flows by gravity from one lake to another as illus- trated; the surface levels of the lakes differ by an eleva- tion of h= 50 ft. If the volumetric flow rate is steady at Q = 80 gallons per minute, what is the associated loss of available energy? (b) A pump is to be installed to pump the water from the lower lake to the upper lake with the same flow rate as above (Q = 80 gpm). If the amount of energy loss is assumed to be the same as in part (a), how much mechanical power must be supplied by the pump? Answer: (a) loss = 1600 ft-lb/slug, (b) Wpump = 2.0 hp

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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(a) Water flows by gravity from one lake to another as illus-
trated; the surface levels of the lakes differ by an eleva-
tion of h= 50 ft. If the volumetric flow rate is steady at
Q = 80 gallons per minute, what is the associated loss
of available energy?
(b) A pump is to be installed to pump the water from the
lower lake to the upper lake with the same flow rate
as above (Q = 80 gpm). If the amount of energy loss
is assumed to be the same as in part (a), how much
mechanical power must be supplied by the pump?
Answer: (a) loss = 1600 ft-lb/slug, (b) Wpump = 2.0
hp
Transcribed Image Text:(a) Water flows by gravity from one lake to another as illus- trated; the surface levels of the lakes differ by an eleva- tion of h= 50 ft. If the volumetric flow rate is steady at Q = 80 gallons per minute, what is the associated loss of available energy? (b) A pump is to be installed to pump the water from the lower lake to the upper lake with the same flow rate as above (Q = 80 gpm). If the amount of energy loss is assumed to be the same as in part (a), how much mechanical power must be supplied by the pump? Answer: (a) loss = 1600 ft-lb/slug, (b) Wpump = 2.0 hp
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