Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781259822674
Author: Yunus A. Cengel Dr., Michael A. Boles
Publisher: McGraw-Hill Education
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Chapter 2.8, Problem 45P
A water pump increases the water pressure from 15 psia to 70 psia. Determine the power input required, in hp, to pump 0.8 ft3/s of water. Does the water temperature at the inlet have any significant effect on the required flow power?
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Students have asked these similar questions
A centrifugal pump compresses 3000 liters/min of water from 98 kPa to 300 kPa.
The inlet and outlet temperatures are 25°C. The inlet and discharge piping are on
the same level, but the diameter of the inlet piping is 15 cm, whereas that of the
discharge piping is 10 cm. Determine the pump power in kilowatts.
Solve the problem.
A reciprocating compressor draws in 500 cubic feet per minute of air whose density is 0.079 lb/cu ft and discharges it with a density of 0.304 lb/cu ft. At the suction, pressure is 15 psia, at discharge pressure is 80 psia. The increase in the specific internal energy is 33.8 Btu/lb and the heat transferred from the air by cooling is 13 Btu/lb. Determine the work on the air in Btu/min and in hp. Neglect change in kinetic energy.
A reciprocating compressor draws in 500 cubic feet per minute of air whose density is 0.079
Ibm/cu ft and discharges it with a density of 0.304 lb /cu ft. At the suction, pi = 15 psia; at
discharge, p = 80 psia. The increase in the specific internal energy is 33.8 Btu/lbm. Determine
the work on the air in Btu/min and in hp. Neglect change in kinetic energy.
Ans. 56.25 hp
Chapter 2 Solutions
Thermodynamics: An Engineering Approach
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