Question
In: Mechanical Engineering
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 = 295 K to p2 = 7 bar. The air is modeled as an ideal gas and kinetic and potential energy effects are negligible. For a polytropic exponent of 1.4, determine the work and heat transfer, each in kJ per kg of air, (1) assuming constant cv evaluated at 300 K. (2) assuming variable specific heats.
Solutions
samet mamat answered 2 years agoRelated Solutions
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
Air undergoes a polytropic process in a piston–cylinder assembly
from p1 = 1 bar, T1 = 295 K
to p2 = 3 bar. The air is modeled as an ideal
gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.2, determine the work and heat
transfer, each in kJ per kg of air,
(1) assuming constant cv evaluated at 300
K.
(2) assuming variable specific heats.
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
Air undergoes a polytropic process in a piston–cylinder assembly
from p1 = 1 bar, T1 = 295 K to p2 = 3 bar. The air is modeled as an
ideal gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.6, determine the work and heat
transfer, each in kJ per kg of air, (1) assuming constant cv
evaluated at 300 K. (2) assuming variable specific heats.
Steam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston–cylinder assembly to a...
Steam, initially at 700 lbf/in.2, 550°F undergoes a
polytropic process in a piston–cylinder assembly to a final
pressure of 2200 lbf/in.2 Kinetic and potential energy
effects are negligible.
Determine the heat transfer, in Btu per lb of steam, for a
polytropic exponent of 1.4,
(a) using data from the steam tables.
(b) assuming ideal gas behavior.
Air is compressed adiabatically in a piston–cylinder assembly from 1 bar, 300 K to 8 bar,...
Air is compressed adiabatically in a piston–cylinder assembly
from 1 bar, 300 K to 8 bar, 600 K. The air can be modeled as an
ideal gas and kinetic and potential energy effects are negligible.
Determine the amount of entropy produced, in kJ/K per kg of air,
for the compression. What is the minimum theoretical work input, in
kJ per kg of air, for an adiabatic compression from the given
initial state to a final pressure of 8 bar? Note...
Air is compressed adiabatically in a piston–cylinder assembly from 1 bar, 300 K to 4 bar,...
Air is compressed adiabatically in a piston–cylinder assembly
from 1 bar, 300 K to 4 bar, 600 K. The air can be modeled as an
ideal gas and kinetic and potential energy effects are negligible.
Determine the amount of entropy produced, in kJ/K per kg of air,
for the compression. What is the minimum theoretical work input, in
kJ per kg of air, for an adiabatic compression from the given
initial state to a final pressure of 4 bar? Note...
Steam undergoes an isentropic compression in an insulated piston–cylinder assembly from an initial state where T1...
Steam undergoes an isentropic compression in an insulated
piston–cylinder assembly from an initial state where
T1 = 120°C, p1 = 1 bar to a
final state where the pressure p2 = 30
bar.
Determine the final temperature, in °C, and the work, in kJ per kg
of steam.
Refrigerant 22 undergoes a constant-pressure process within a piston–cylinder assembly from saturated vapor at 5.0 bar...
Refrigerant 22 undergoes a constant-pressure process within a
piston–cylinder assembly from saturated vapor at 5.0 bar to a final
temperature of 25°C. Kinetic and potential energy effects are
negligible.
Evaluate the work and the heat transfer, each in kJ per kg of
refrigerant.
5 kg of butane (C4H10), contained in a piston-cylinder device undergoes a process from P1 =...
5 kg of butane (C4H10), contained in a piston-cylinder device
undergoes a process from P1 = 5 MPa, T1 = 500 K to P2 = 3 MPa and
T2 = 450 K during which the relationship between pressure and
specific volume is PVn = C.
a. Using the data from Generalized Compressibility chart, determine
the amount of work done during the process.
b. If butane is assumed an ideal gas, how would you compare the
work done during the process...
Seven lbm of ammonia in a piston-cylinder assembly, initially at p1 = 60 lbf/in2 and T1...
Seven lbm of ammonia in a piston-cylinder assembly, initially at
p1 = 60 lbf/in2 and T1 = 120 (one hundred twenty) oF, undergoes an
isobaric process to a final state. The work done on a system is 90
Btu. At the final state, determine the temperature (in oF) and the
quality of ammonia.
Five kg of butane (C4H10) in a piston–cylinder assembly undergo a process from p1 = 5...
Five kg of butane (C4H10) in a piston–cylinder assembly undergo
a process from p1 = 5 MPa, T1 = 500 K to p2 = 2 MPa, T2 = 450 K
during which the relationship between pressure and specific volume
is pvn = constant. Determine the work, in kJ.
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