Question

An adiabatic air compressor compresses 10.6 L/s of air at 120
kPa and 20°C to 1000 kPa and 300°C. The constant pressure specific
heat of air at the average temperature of 160°C = 433 K is
*c _{P}* = 1.018 kJ/kg·K. The gas constant of air is

Answer #1

An adiabatic air compressor compresses 0.1 kg/s of air at 120
kPa and 22 C to 900 kPa and 227 C. Determine the power required to
do the job. Express the power in kW and enter the absolute value
(no signs).

Air at 100 kPa and 10°C enters a compressor and is brought to
1000 kPa and 50°C. The constant pressure heat capacity of air is
1.01 kJ/kg K. If 15 kg/min of air are to be compressed, determine
the power require- ment of the compressor. State your assumptions.
(12.625 kW)

An adiabatic compressor is used to pressurize air from 160 kPa
to 1900 kPa. If the air entering the compressor is at 300 K, and
the isentropic efficiency of the air is 70 %, then calculate the
required work by performing an:
(a) approximate analysis (assume 300 K values for specific
heats) kJkg
(b) exact analysis (variable specific heats) kJkg

An adiabatic compressor is used to pressurize air from 100 kPa
to 1900 kPa. If the air entering the compressor is at 300 K, and
the isentropic efficiency of the air is 75 %, then calculate the
required work by performing an: (a) approximate analysis (assume
300 K values for specific heats) (b) exact analysis (variable
specific heats)

An air compressor, operated at steady state, compresses air from
1 bar 25oC to 10 bar. At the outlet of the compressor,
the air temperature is 80oC. The compressor transfers
heat to the surroundings at 300kJ for each kg of air passing
through the compressor. The average temperature at which the heat
is transferred is 50oC. Which of the following values is
closest to the specific entropy production of the compressor
process? For air, Cp=1.01 kJ/kgK and R=0.286kJ/kgK. Hints: Air...

air pressure of 103 kPa., entering the compressor at a
temperature of 15 degrees Celsius and a low speed. 1 mPa pressure,
336 degrees Celsius temperature and 106 m / s speed is coming out
of the compressor. The compressor is cooled by air at a temperature
of 15 degrees Celsius and 26 kW. The power input to the compressor
is 298 kW. (cp= 1.005kj/kgK , R=0.287 kj/kgK)
a) Find the mass flow of air
b) calculate the irreversibility in...

An isentropic compressor that takes in air from the atmosphere
at 100 kPa and 300 K compresses it to 1 MPa. The compressor feeds
into a rigid tank that is initially filled with 5 kg of air at a
pressure of 500 kPa and a temperature of 500 K. Once the mass in
the tank reaches 8 kg, the compressor will stop to prevent the tank
from rupturing, which will occur if the pressure exceeds 1000
kPa.
a) Determine the...

Steam enters an adiabatic compressor at 100 kPa and 125°C,
ejecting at 1000 kPa and 565°C. What is the fractional isentropic
efficiency of this compressor? (if your answer is 23%, enter the
value 0.23)
Draw and label 2 diagrams: your real compressor and your
"fake" compressor, and remember that the two share in common
identical feed streams but only the pressure in the exiting
stream.

3. Air with 100 kPa, 300 K flows into the insulating compressor
with a flow rate of 2 kg/s, compressed to 1000 kPa and then
discharged to the exit. The back entropy efficiency of the
compressor is 82%. The gas constant of the ideal gas is the air,
and the meanness of the air is , The mean ratio is k=1.4. Ignore
kinetic energy and position energy.
1) Draw a schematic diagram and a T-s plot of the compressor.
2)...

A rigid closed tank is full of oxygen at 120 kPa and 25 C. The
mass of oxygen in the tank is 1.8
kg. A stirring device introduces 150 kJ of work and there is heat
loss to the surroundings in the
amount of 45 kJ. Find the final temperature in Celsius and pressure
in kPa.
Assume specific heats constant at room temperature (300 K).

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