Question
In: Mechanical Engineering
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.
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 = 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.
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.
A piston–cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 600°F. The water...
A piston–cylinder assembly contains 2 lb of water, initially at
100 lbf/in.2 and 600°F. The water undergoes two processes in
series: a constant-pressure process followed by a constant volume
process. At the end of the constant-volume process, the temperature
is 300°F and the water is a two-phase liquid–vapor mixture with a
quality of 50%. Neglect kinetic and potential energy effects.
Determine the work and heat transfer for each process, all in
Btu.
A piston–cylinder device contains steam that undergoes a reversible thermodynamic cycle. Initially the steam is at...
A piston–cylinder device contains steam that undergoes a
reversible thermodynamic cycle. Initially the steam is at 400 kPa
and 350oC with a volume of 0.3 m3. The steam is first expanded
isothermally to 150 kPa, then compressed adiabatically to the
initial pressure, and finally compressed at the constant pressure
to the initial state. Determine (a) the net work and heat transfer
for the cycle after you calculate the work and heat interaction for
each process and (b) show the cyclic...
Air within a piston–cylinder assembly, initially at 15 lbf/ in.2, 510°R, and a volume of 6...
Air within a piston–cylinder assembly, initially at 15 lbf/
in.2, 510°R, and a volume of 6 ft3, is
compressed isentropically to a final volume of 1.75
ft3.
Assuming the ideal gas model with k = 1.4 for the air,
determine the:
(a) mass, in lb.
(b) final pressure, in lbf/in.2
(c) final temperature, in °R.
(d) work, in Btu.
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.
Problem 6.082 SI Steam undergoes an isentropic compression in an insulated piston–cylinder assembly from an initial...
Problem 6.082 SI
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 = 50
bar.
Determine the final temperature, in °C, and the work, in kJ per kg
of steam.
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.
A gas in a piston–cylinder assembly undergoes a compression process for which the relation between pressure...
A gas in a piston–cylinder assembly undergoes a compression
process for which the relation between pressure and volume is given
by pVn = constant. The initial volume
is 0.2 m3, the final volume is 0.04 m3, and
the final pressure is 2 bar.
For n = 1.3, determine the initial pressure, in bar, and
the work for the process, in kJ.
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