A double-acting compressor with c= 7% draws 40 lb per minute of air at 14.7 psia and 80°F and discharges it at 90 psia. Compression and expansion are polytropic with n= 1.28. Find (a) the work, (b) the heat rejected, (c)the bore and stroke for 90 rpm and L/D= 1.25.Answer: (a) 77.68 hp (b) -1057 Btu/min (c) 18.96 x 23.70 in. 4. A 14 x 12-in., single-cylinder, double-acting air compressor with 5.5% clearance operates at12 rpm. The suction pressure and temperature are 14 psia and 100°F, respectively. Thedischarge pressure is 42 psia. Compression and expansion processes are polytropic, with n=1.30. Determine (a) the volumetric efficiency, (b) mass and volume at suction conditionshandled each minute, (c) the work, (d) the heat rejected, (e) the indicated air hp developed ifthe polytropic compression efficiency is 75%, and (f) the compression efficiency.Answer: (a) 92.7% (b) 247.8 cfm, 16.72 Ib/min (c) -18.93 hp (d) -175.7 Btu/min (e) -25.24 hp (f)77.42%

Given data: The clearance of the cylinder is c = 7%. The mass flow rate of the air into the…

Answered: A double-acting compressor with c= 7%…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A double-acting compressor with c= 7% draws 40 lb per minute of air at 14.7 psia and 80°F and discharges it at 90 psia. Compression and expansion are polytropic with n= 1.28. Find (a) the work, (b) the heat rejected, (c)the bore and stroke for 90 rpm and L/D= 1.25.

Answer: (a) 77.68 hp (b) -1057 Btu/min (c) 18.96 x 23.70 in.

4. A 14 x 12-in., single-cylinder, double-acting air compressor with 5.5% clearance operates at
12 rpm. The suction pressure and temperature are 14 psia and 100°F, respectively. The
discharge pressure is 42 psia. Compression and expansion processes are polytropic, with n=
1.30. Determine (a) the volumetric efficiency, (b) mass and volume at suction conditions
handled each minute, (c) the work, (d) the heat rejected, (e) the indicated air hp developed if
the polytropic compression efficiency is 75%, and (f) the compression efficiency.
Answer: (a) 92.7% (b) 247.8 cfm, 16.72 Ib/min (c) -18.93 hp (d) -175.7 Btu/min (e) -25.24 hp (f)
77.42%

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