Question
In: Mechanical Engineering
Air of 0.5 kg mass is compressed in a piston-cylinder device from 300 K, 120 kPa...
Air of 0.5 kg mass is compressed in a piston-cylinder device from 300 K, 120 kPa to 500K, 940 kPa. (a) Determine the entropy change in kJ/K using (i) approximate analysis and (ii) exact analysis. (b) Determine the direction of heat transfer (into the device or out of the device).
Solutions
samet mamat answered 2 years agoRelated Solutions
One-quarter kilogram of air is compressed in a piston-cylinder device from 350 K and 150 kPa...
One-quarter kilogram of air is compressed in a piston-cylinder
device from 350 K and 150 kPa to 550 K and 900 kPa. Determine
a. The entropy change, in KJ/K.
b. The direction of any heat transfer by using the entropy
balance.
c. What-if scenario: If this process occurs adiabatically, is
this process reversible, irreversible, or impossible process?
Please answer the nature of this process and why.
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...
Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The...
Air enters the compressor at 100 kPa, 300 K and is compressed to
1000 kPa. The temperature at the inlet to the first turbine stage
is 1400 K. The expansion takes place isentropically in two stages,
with reheat to 1400 K between the stages at a constant pressure of
300 kPa. A regenerator having an effectiveness of 100% is also
incorporated into the cycle. The turbine and the compressor each
have am isentropic efficiency of 80%. Determine the following:
(a.)...
Thermodynamics An insulated piston/cylinder device contains ideal CO2 gas at 800 kPa, 300 K, which is...
Thermodynamics
An insulated piston/cylinder device contains ideal CO2 gas at
800 kPa, 300 K, which is then compressed to 6 MPa in a reversible
adiabatic process. Determine the final temperature and the specific
work during the compression process using:
(a) Ideal gas tables A.8,
(b) Constant specific heats A.5.
A piston cylinder device containing 0.5 kg of water has initial volume of 0.5L. The device...
A piston cylinder device containing 0.5 kg of water has
initial volume of 0.5L. The device starts and goes through a Carnot
cycle and generates 500.3 kJ work. If the maximum temperature that
water will reach is 1.5 times the minimum temperature of water and
during heat rejection process, water goes from saturated vapor to
saturated liquid phase
Find:
1. QH & QL for this cycle (10 points).
2. TH & TL for this cycle (10 points).
3. Maximum and...
A piston cylinder device containing 0.5 kg of water has initial volume of 0.5L. The device...
A piston cylinder device containing 0.5 kg of water has initial
volume of 0.5L. The device starts and goes through a Carnot cycle
and generates 500.3 kJ work. If the maximum temperature that water
will reach is 1.5 times the minimum temperature of water and during
heat rejection process, water goes from saturated vapor to
saturated liquid phase. Find:
1. QH & QL for this cycle .
2. TH & TL for this cycle.
3. Maximum and minimum pressures that...
At steady state, air at 200 kPa, 330 K, and mass flow rate of 0.5 kg/s...
At steady state, air at 200 kPa, 330 K, and mass flow rate of
0.5 kg/s enters an insulated duct having differing inlet and exit
cross-sectional areas. The inlet cross-sectional area is 6
cm2. At the duct exit, the pressure of the air is 100
kPa and the velocity is 250 m/s.
Neglecting potential energy effects and modeling air as an ideal
gas with constant cp = 1.008 kJ/kg · K,
determine:
(a) the velocity of the air at the...
100 kg of R-134a at 320 kPa are contained in a piston-cylinder device whose volume is...
100 kg of R-134a at 320 kPa are contained in a piston-cylinder
device whose volume is 7.530 m3. The piston is now moved
until the volume is one-half its original size. This is done such
that the pressure of the R-134a does not change. Determine the
final temperature and the change in the total internal energy of
the R-134a. (Round the final answers to two decimal places.)
100 kg of R-134a at 200 kPa are contained in a piston–cylinder device whose volume is...
100 kg of R-134a at 200 kPa are contained in a piston–cylinder
device whose volume is 12.766 m3. The piston is now
moved until the volume is one-half its original size. This is done
such that the pressure of the R-134a does not change. Determine the
final temperature and the change in the total internal energy of
R-134a. Use data from the steam tables.
The final temperature is °C.
The total change in internal energy is kJ/kg.
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