A compressor draws in 500 cfm of air whose density is 0.079 lb/ft and discharges it with a density of 0.304 lb/ft. At the suction, p.-15 psia; at discharge, p-80 psia. The increase in the specific internal energy is 33.8 Btu/lb, and the heat from the air by cooling is 13 Btu/ Ib. Neglecting changes of potential and kinetic energy, determine the work done on the air in Btu/min and in hp.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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15. A compressor draws in 500 cfm of air whose density is 0.079 lb/ft' and discharges it with a
density of 0.304 lb/ft. At the suction, p,-15 psia; at discharge, p,-80 psia. The increase
in the specific internal energy is 33.8 Btu/lb, and the heat from the air by cooling is 13 Btu/
Ib. Neglecting changes of potential and kinetic energy, determine the work done on the air in
Btu/min and in hp.
[ans:-2385 Btu/min]
Transcribed Image Text:15. A compressor draws in 500 cfm of air whose density is 0.079 lb/ft' and discharges it with a density of 0.304 lb/ft. At the suction, p,-15 psia; at discharge, p,-80 psia. The increase in the specific internal energy is 33.8 Btu/lb, and the heat from the air by cooling is 13 Btu/ Ib. Neglecting changes of potential and kinetic energy, determine the work done on the air in Btu/min and in hp. [ans:-2385 Btu/min]
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