COMPRESSORS
問題一覧
1
An ideal single stage air compressor without clearance takes in air at 100 kPa with a temperature of 16°C and delivered it at 413 kPa after isentropic compression. What is the discharge work done by the compressor in kJ/kg?
-145 KW
2
An air compressor is to compress 8.5 m³/min from 98.56 kPa to 985.6 kPa. Assuming ideal conditions, and with n=1.3 what will be the saving in work due to two staging?
5.6 KW
3
A two stage compressor with first stage piston displacement of 94,390 cm³/s is driven by a motor. Motor output is 35 Hp, suction temperature is 22°C. volumetric efficiency 85%, mechanical efficiency 95%, the intercooler pressure is 30 psi ġage. Air temperature in and out of the intercooler are 105°C and 44°C, Final discharge pressure is 100 psi gage, suction estimated 14.5 psi. Find the compression efficiency.
77.68
4
A single stage air compressor handles 0.454 m³/s of atmospheric pressure, 27°C air, and delivers it to a receiver at 652.75 kPa. Its volumetric efficiency is 0.72, its compression efficiency on an isothermal basis is 0.85 and its mechanical efficiency is 0.90. If it rotates at 350 rpm, what power in kW is required to drive it?
112 KW
5
A rotary compressor receives 8 m³/min. of a gas (R = 0.410 kJ/kg-K. Cp = 1.03 KJ/kg) cal 108 kPa, 27°C and delivers it at 650 kPa. Find the work compression is polytropic with PV1.3=C
-32.02 KW
6
Air taken from the atmosphere at 100 kPa and 21°C is delivered to the air receiver at 690 kPa and 150°C by means of a water jacketed reciprocating compressor. The compressor has rated capacity of 0.15 m³/s free air. Determine the power required to compress the air.
34.94 KW
7
The stroke of the piston of an air compressor is 250 mm and the clearance volume is equal to 6% of the stroke volume. The pressure of the air at the beginning of compression of 0.98 bar and it is discharge at 3.8 bar. Assuming compression to follow the law PV^{n}=C where n=1.25 calculate the distance moved by the piston from the beginning of its pressure stroke before the discharge valves opens and express this as a percentage of the stroke.
70.15
8
A double acting compressor with piston displacement of 0.05 m³ per stroke operates at 500 rpm. The clearance factor is 5% and it receives air at 100 Kра and discharges it at 600 kPa. The compression and re-expansion curve is polytropic with n = 1.3. Determine the power required to compress the air.
157.54 KW
9
A single acting air compressor has a volumetric efficiency of 87% operates at 500 rpm. It takes in air at 100 kPa and 30°C and discharges it at 600 kPa. The air handled is 6 m³/min measured at discharge condition. If compression is isentropic, find the mean effective pressure in kPa.
203.59
10
The piston displacement of a double acting compressor is 0.358 m³/s delivers gas from 101.325 kPa and 300 K to 675 Kpa at the rate of 0.166 m³/s at 150 rpm. Value of n for compression and expansion is 1.33. Find the compressor percent clearance.
16.96
11
A single acting air compressor operates at 150 rpm with an initial condition of air at 97.9 kPa and 27°C and discharges the air at 379 kPa to a cylindrical tank The bore and stroke are 355 mm and 381 mm respectively with 5% clearance. If the surrounding air is at 100 kPa and 20°C while the compression and expansion process are PV13 C, determine the free air capacity in m³/s.
0.0819
12
The diameter of an air compressor cylinder is 140 mm, the stroke of the piston is 180 mm, and the clearance volume is 77 cm³. The pressure and temperature of the air in the cylinder at the end of the suction stroke and beginning of compression is 0.97 bar and 13°C. The delivery pressure is constant at 4.2 bar Taking the law of compression as PVC, calculate the volume of air delivered per stroke in liters.
0.8457 L
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17問 • 1年前問題一覧
1
An ideal single stage air compressor without clearance takes in air at 100 kPa with a temperature of 16°C and delivered it at 413 kPa after isentropic compression. What is the discharge work done by the compressor in kJ/kg?
-145 KW
2
An air compressor is to compress 8.5 m³/min from 98.56 kPa to 985.6 kPa. Assuming ideal conditions, and with n=1.3 what will be the saving in work due to two staging?
5.6 KW
3
A two stage compressor with first stage piston displacement of 94,390 cm³/s is driven by a motor. Motor output is 35 Hp, suction temperature is 22°C. volumetric efficiency 85%, mechanical efficiency 95%, the intercooler pressure is 30 psi ġage. Air temperature in and out of the intercooler are 105°C and 44°C, Final discharge pressure is 100 psi gage, suction estimated 14.5 psi. Find the compression efficiency.
77.68
4
A single stage air compressor handles 0.454 m³/s of atmospheric pressure, 27°C air, and delivers it to a receiver at 652.75 kPa. Its volumetric efficiency is 0.72, its compression efficiency on an isothermal basis is 0.85 and its mechanical efficiency is 0.90. If it rotates at 350 rpm, what power in kW is required to drive it?
112 KW
5
A rotary compressor receives 8 m³/min. of a gas (R = 0.410 kJ/kg-K. Cp = 1.03 KJ/kg) cal 108 kPa, 27°C and delivers it at 650 kPa. Find the work compression is polytropic with PV1.3=C
-32.02 KW
6
Air taken from the atmosphere at 100 kPa and 21°C is delivered to the air receiver at 690 kPa and 150°C by means of a water jacketed reciprocating compressor. The compressor has rated capacity of 0.15 m³/s free air. Determine the power required to compress the air.
34.94 KW
7
The stroke of the piston of an air compressor is 250 mm and the clearance volume is equal to 6% of the stroke volume. The pressure of the air at the beginning of compression of 0.98 bar and it is discharge at 3.8 bar. Assuming compression to follow the law PV^{n}=C where n=1.25 calculate the distance moved by the piston from the beginning of its pressure stroke before the discharge valves opens and express this as a percentage of the stroke.
70.15
8
A double acting compressor with piston displacement of 0.05 m³ per stroke operates at 500 rpm. The clearance factor is 5% and it receives air at 100 Kра and discharges it at 600 kPa. The compression and re-expansion curve is polytropic with n = 1.3. Determine the power required to compress the air.
157.54 KW
9
A single acting air compressor has a volumetric efficiency of 87% operates at 500 rpm. It takes in air at 100 kPa and 30°C and discharges it at 600 kPa. The air handled is 6 m³/min measured at discharge condition. If compression is isentropic, find the mean effective pressure in kPa.
203.59
10
The piston displacement of a double acting compressor is 0.358 m³/s delivers gas from 101.325 kPa and 300 K to 675 Kpa at the rate of 0.166 m³/s at 150 rpm. Value of n for compression and expansion is 1.33. Find the compressor percent clearance.
16.96
11
A single acting air compressor operates at 150 rpm with an initial condition of air at 97.9 kPa and 27°C and discharges the air at 379 kPa to a cylindrical tank The bore and stroke are 355 mm and 381 mm respectively with 5% clearance. If the surrounding air is at 100 kPa and 20°C while the compression and expansion process are PV13 C, determine the free air capacity in m³/s.
0.0819
12
The diameter of an air compressor cylinder is 140 mm, the stroke of the piston is 180 mm, and the clearance volume is 77 cm³. The pressure and temperature of the air in the cylinder at the end of the suction stroke and beginning of compression is 0.97 bar and 13°C. The delivery pressure is constant at 4.2 bar Taking the law of compression as PVC, calculate the volume of air delivered per stroke in liters.
0.8457 L