Question
In: Mechanical Engineering
A volume of 8.62 m3 of air in a rigid, insulated container fitted with a paddle...
A volume of 8.62 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 322 K, 0.4 bar. The air receives 481 kJ by work from the paddle wheel. Assuming the ideal gas model with cv = 0.71 kJ/kg • K, determine for the air the amount of entropy produced, in kJ/K.
Solutions
samet mamat answered 2 years agoRelated Solutions
An insulated rigid tank having a 0.2 m3 volume initially contains air at 400 kPa and...
An insulated rigid tank having a 0.2 m3 volume initially
contains air at 400 kPa and 313 K. The amount of paddle-wheel work
done on the system is 200 kJ. Calculate the nearest value of
entropy change
a. 0.66 kJ/K
b. 0.88 kJ/K
c. None
d. 0.44 kJ/K
e. 0.33 kJ/K
A closed, rigid tank fitted with a paddle wheel contains 2.2 kg of air, initially at...
A closed, rigid tank fitted with a paddle wheel contains 2.2 kg
of air, initially at 200oC, 1 bar. During an interval of 20
minutes, the paddle wheel transfers energy to the air at a rate of
1 kW. During this time interval, the air also receives energy by
heat transfer at a rate of 0.5 kW. These are the only energy
transfers. Assume the ideal gas model for the air, and no overall
changes in kinetic or potential energy....
An insulated, rigid tank whose volume is 0.5 m3 is connected by a valve to a...
An insulated, rigid tank whose volume is 0.5 m3 is
connected by a valve to a large vessel holding steam at 40 bar,
480°C. The tank is initially evacuated. The valve is opened only as
long as required to fill the tank with steam to a pressure of 20
bar.
Determine:
(a) the final temperature of the steam in the tank, in °C, the
final mass of the steam in the tank, in kg, and
(b) the amount of entropy...
Two kilograms of air is stored in a rigid volume of 2 m3 with the temperature...
Two kilograms of air is stored in a rigid volume of 2 m3 with
the temperature initially at 300°C. Heat is transferred from the
air until the pressure reaches 120 kPa. Calculate the entropy
change of (a) the air and (b) the universe if the surroundings are
at 27°C.
A house has well-insulated walls. It contains a volume of 90 m3 of air at 295...
A house has well-insulated walls. It contains a volume of 90
m3 of air at 295 K.
(a) Consider heating it at constant pressure. Calculate the
energy required to increase the temperature of this diatomic ideal
gas by 1.5�C.
(b) If this energy could be used to lift an object of mass
m through a height of 2.3 m, what is the value of
m?
A rigid tank of volume 0.63 m3 initially has some air inside at 0.5 bar and...
A rigid tank of volume 0.63 m3 initially has some air inside at
0.5 bar and 300 K. A hole develops in the wall, and air from the
surroundings at 1 bar, 300 K flows in until the pressure in the
tank reaches 1 bar. Heat transfer between the contents of the tank
and the surroundings is negligible. Determine the final temperature
in the tank, in K. What is the entropy generation of the process?
(Please treat the air as...
A rigid tank of volume 0.63 m3 initially has some air inside at 0.5 bar and...
A rigid tank of volume 0.63 m3 initially has some air inside at
0.5 bar and 300 K. A hole develops in the wall, and air from the
surroundings at 1 bar, 300 K flows in until the pressure in the
tank reaches 1 bar. Heat transfer between the contents of the tank
and the surroundings is negligible. Determine the final temperature
in the tank, in K. What is the entropy generation of the
process?
(Please treat the air as...
A rigid tank of volume 0.63 m3 initially has some air inside at 0.5 bar and...
A rigid tank of volume 0.63 m3 initially has some air inside at
0.5 bar and 300 K. A hole develops in the wall, and air from the
surroundings at 1 bar, 300 K flows in until the pressure in the
tank reaches 1 bar. Heat transfer between the contents of the tank
and the surroundings is negligible. The final temperature is 350 K.
Use the transient state entropy balcance to find the entropy
generation of the process
An insulated tank, fitted with a freely moving frictionless piston, has an initial volume of 1...
An insulated tank, fitted with a freely moving frictionless
piston, has an initial volume of 1 m3 and contains 20 kg of
refrigerant 134a at 200 kPa. A stirrer with a rotation rate of 300
rpm and a torque of 15 J/rotation is included in the tank. Find the
time required for the refrigerant to evaporate completely.
Ans= [73.36 minutes]
A cylinder fitted with a piston has an initial volume of 0.1 m3 and contains nitrogen...
A cylinder fitted with a piston has an initial volume of 0.1 m3
and contains nitrogen at 150 kPa, 25 0C. The piston is moved,
compressing the nitrogen until the pressure is 1 MPa and the
temperature is 150 0C. During this compression process heat is
transferred from the nitrogen, and the work done on the nitrogen is
20 kJ. Determine the amount of this heat transfer.
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