Question

An adiabatic compressor operates on air in a steady state process. The air enters the compressor at 25 oC and 150 kPa and exits at 250 oC and 500 kPa. Assuming constant specific heats for air at 300K, calculate the isentropic efficiency for this compressor.

Answer #1

a compressor operates at steady state. air enters the
compressor with a mass flow rate of 28800 kg/h at .99 bar and 27C
and exits at 7.5 bar. the compressor operates adiabatically and the
effects of motion and gravity can be ignored. the compressor
isentropic efficiency is 70%. for exergy analysis the reference
state is To=27C Po=.99 bar. use ideal gas model for air (MW=28.97
kg/kmol)
a. determine required power for compressor in kW
b. determine rate of exergy destruction...

Carbon dioxide enters an adiabatic compressor at100 kPa and 300
K at a rate of 0.5 kg/s and exits at 600 kPa and 450 K. Neglecting
the kinetic energy changes, determine the isentropic efficiency of
the compressor. Assume constant specific heats.
please show all the work and how you got it please and thank
you

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)

Air at 277 oC and 1000 kPa enters a turbine operating at steady
state with a mass flow rate of 70 kg/hr. It exits the turbine at 27
oC and 700 kPa. During this process heat is added from the
surroundings at 77 oC to the turbine at a rate of 1000 kJ/hr. Using
variable specific heats, determine whether this claim is correct.
Justify your answer.

NO INTERPOLATION REQUIRED
Air enters an adiabatic turbine at 1000 kPa and 1625 degrees C
(state 1) with a mass flow rate of 5 kg/s and leaves at 100 kPa the
isentropic efficiency of the turbine is 85%. Neglecting the kinetic
energy change of the steam, and considering variable specific
heats, determine:
a. the isentropic power of the turbine
Isentropic power in kW
b. the temperature at the turbine exit
temperature at exit in degrees C
c. the actual power...

A vapor-compression refrigeration cycle operates at steady state
with Refrigerant 134a as the working fluid. Saturated vapor enters
the compressor at 2 bar, and saturated liquid exits the condenser
at 8 bar. The isentropic compressor efficiency is 80%. The mass
flow rate of refrigerant is 7 kg/min. Determine: (a) the compressor
power, in kW, (b) the refrigeration capacity, in tons, (1 ton =
3.5168 kW) and, (c) the coefficient of performance, (d) rate of
entropy production in kW/K, for the...

A two-part compressor operates with steady state conditions. The
exit of the first part of the compressor is also the inlet of the
second part of the compressor. In the first part of the compressor,
air is compressed from 1.5 bar, 350 K to 5.5 bar with a mass flow
rate of 7.2 kg/sec. In the second part of the compressor, air is
compressed from 5.5 bar to 9.5 bar with a mass flow rate of 5.8
kg/sec. Each unit...

4.58 Air enters a compressor operating at
steady state with a pressure of 14.7 lbf/in^2, a temperature of 808
F, and a volumetric flow rate of 18 ft /s. The air exits the
compressor at a pressure of 90 lbf/in^2 Heat transfer from the
compressor to its surroundings occurs at a rate of 9.7 Btu per lb
of air flowing. The compressor power input is 90 hp. Neglecting
kinetic and potential energy effects and modeling air as an ideal
gas,...

Air enters a compressor operating at steady state at 15.4
lbf/in^2, 80°F with a volumetric flow rate of 424 ft^3/min and
exits at 176.4 lbf/in^2, 260°F. Heat transfer occurs at a rate of
6800 Btu/h from the compressor to its surroundings. Assuming the
ideal gas model for air and neglecting kinetic and potential energy
effects, determine the power input, in hp.

An air turbine with inlet conditions of 500 kPa, 327 C operates
in steady flow and has an actual power output of 70 kW. The
discharge pressure is 100 kPa and the turbine has an efficiency of
0.8 at these operating conditions. Consider specific heats
constant.
a) Calculate the actual mass flow rate at the turbine exit.
b) Calculate the actual turbine exit temperature.
c) Show the actual and ideal processes on a T-s and P-v
diagram.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 16 minutes ago

asked 18 minutes ago

asked 24 minutes ago

asked 24 minutes ago

asked 46 minutes ago

asked 51 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago