Question
In: Mechanical Engineering
Air is compressed from an initial state of 1 bar and 298.15K to a final state...
Air is compressed from an initial state of 1 bar and 298.15K to a final state of 5 bar and 295.15K by three different mechanically reversible processes in a closed system: • Heating at constant volume followed by cooling at constant pressure • Isothermal compression • Adiabatic compression followed by cooling at constant volume Show these processes in a PV diagram and calculate the work required, heat transferred, and the changes in internal energy and enthalpy of the air for each process. For air, Cv ig = 20.785 and Cp ig = 29.100 J/mol/K
Solutions
samet mamat answered 2 years agoRelated Solutions
Propane gas at 1 bar and 35°C is compressed to a final state of 135 bar...
Propane gas at 1 bar and 35°C is compressed to a final state of
135 bar and 195°C. Estimate the molar volume of the propane in the
final state and the enthalpy and entropy changes for the process.
In its initial state, propane may be assumed an ideal gas.
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
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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
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. An ideal gas initially contained at 1 bar and 25ºC, is compressed to a final...
. An ideal gas initially contained at 1 bar and 25ºC, is
compressed to a final state of 5 bar and 25ºC. Although the initial
and final temperatures are the same, the process is NOT isothermal.
Rather, the change of state occurs in two steps. First, the gas is
cooled at constant pressure (i.e., 1 bar). Second, the gas is
heated at constant volume. Please calculate Q, W, DU, and DH for
the two steps. Note: Cp*=29.1 J/mol/K, and 1...
QUESTION NO 1 In an Otto cycle air is compressed from an initial pressure 120 kPa...
QUESTION NO 1
In an Otto cycle air is compressed from an initial pressure 120
kPa and temperature (T = 380). The cycle has compression ratio of
10. In the constant volume heat, addition process 1000 kJ/kg heat
is added into the air. Considering variation on the specific heat
of air with temperature, determine,
(a) the pressure and temperature at the end of heat addition
process (show the points on P-v diagram)
(b) the network output
(c) the thermal efficiency...
In a gas turbine plant, air is compressed from 1.01 bar and 15 ?C through a...
In a gas turbine plant, air is compressed from 1.01 bar and 15
?C through a pressure ratio of 4. It is then heated to 650 ?C in a
combustion chamber, and expanded back to atmospheric pressure.
Calculate the cycle efficiency and work ratio if a perfect heat
exchanger is employed. The isentropic efficiencies of the turbine
and compressor are 0.85 and 0.80, respectively. ANSWER (0.319,
0.319)
A compressor, operating at steady-state, increases the pressure of an air stream from 1 bar to...
A compressor, operating at steady-state, increases the pressure
of an air stream from 1 bar to 10 bar while losing 4.2 kW of heat
to the surroundings. At the compressor inlet, the air is at 25o C
and has a velocity of 14 m/s. At the compressor outlet, the air is
at 350o C and has a velocity of 2.4 m/s. If the compressor inlet
has a cross-sectional area of 500 cm2 and the air behaves as an
ideal gas,...
A compressor, operating at steady-state, increases the pressure of an air stream from 1 bar to...
A compressor, operating at steady-state, increases the pressure
of an air stream from 1 bar to 10 bar while losing 4.2 kW of heat
to the surroundings. At the compressor inlet, the air is at 25o C
and has a velocity of 14 m/s. At the compressor outlet, the air is
at 350o C and has a velocity of 2.4 m/s. If the compressor inlet
has a cross-sectional area of 500 cm2 and the air behaves as an
ideal gas,...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370...
In an Otto cycle air is compressed from an initial
pressure 120 kPa and temperature 370 T (K). The cycle has
compression ratio of 10. In the constant volume heat addition
process 1000 kJ/kg heat is added into the air. Considering
variation on the specific heat of air with temperature,
determine,
(a) the pressure and temperature at the end of heat
addition process (show the points on P-v diagram)
(b) the network output
(c) the thermal efficiency
(d) the mean...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370...
In an Otto cycle air is compressed from an initial
pressure 120 kPa and temperature 370 T (K). The cycle has
compression ratio of 10. In the constant volume heat addition
process 1000 kJ/kg heat is added into the air. Considering
variation on the specific heat of air with temperature,
determine,
(a) the pressure and temperature at the end of heat
addition process (show the points on P-v diagram)
(b) the network output
(c) the thermal efficiency
(d) the mean...
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