Question
In: Mechanical Engineering
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. Do not assume specific heats are constant. Determine the change in specific internal energy for the air, in kJ/kg, and the final temperature of the air, in oC. The answer to the change in internal energy is 818.2 kJ/kg. find the final temperature of the air, in oC.
Solutions
samet mamat answered 2 years agoRelated Solutions
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.
A closed, rigid tank contains water initially at 250 °F with a quality of 0.4. The...
A closed, rigid tank contains water initially at 250 °F with a
quality of 0.4. The tank is heated until the water reaches 290 °F.
Find the initial and final pressure, in lbf/in2 . Sketch the
process on P-υ and T-υ diagrams (be sure to include the vapor dome,
constant temperature and pressure lines, number your states, and
indicate the process direction with an arrow). Thermodynamic
0.1 kg of air (ideal gas) is contained in a closed, rigid tank of volume 0.04...
0.1 kg of air (ideal gas) is contained in a closed, rigid tank
of volume 0.04 m^3 at 500 K. A paddle wheel stirs the air and
transfers energy to the air at a constant rate of 1 kW for 100s.
The temperature of the air increases to 600 K.
(a) What is the final pressure of the air (kPa)
(b)Calculate the heat transfer (kJ) for the process (use a
constant, average specific heat)
0.1 kg of air (ideal gas) is contained in a closed, rigid tank of volume 0.04...
0.1 kg of air (ideal gas) is contained in a closed, rigid tank
of volume 0.04 m^3 at 500 K. A paddle wheel stirs the air and
transfers energy to the air at a constant rate of 1 kW for 100s.
The temperature of the air increases to 600 K.
(a) What is the final pressure of the air (kPa)
(b)Calculate the heat transfer (kJ) for the process (use a
constant, average specific heat)
A closed rigid tank contains 2 kg of water at 80 C and quality of 0.5815....
A closed rigid tank contains 2 kg of water at 80 C and
quality of 0.5815. The tank is then heated until it contains
only
saturated vapor. How much heat (in kJ) is added to reach this
condition? Include a drawing and plot the process on a P-V
diagram.
Organize the solution as
Given and drawing:
Assumptions:
First Law Analysis:
Solution:
PV diagram:
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 is filled with water. Initially, the tank holds 0.6 lb of saturated...
A closed, rigid tank is filled with water. Initially, the tank
holds 0.6 lb of saturated vapor and 6.0 lb of saturated liquid,
each at 212°F. The water is heated until the tank contains only
saturated vapor. Kinetic and potential energy effects can be
ignored.
Determine the volume of the tank, in ft3, the temperature at
the final state, in °F, and the heat transfer, in Btu.
A closed, rigid tank contains a two-phase liquid–vapor mixture of Refrigerant 22 initially at -20°C with...
A closed, rigid tank contains a two-phase liquid–vapor mixture
of Refrigerant 22 initially at -20°C with a quality of 47.50%.
Energy transfer by heat into the tank occurs until the refrigerant
is at a final pressure of 6 bar.
a) Determine the final temperature, in °C.
b) If the final state is in the superheated vapor region, at what
temperature, in °C, does the tank contain only saturated vapor?
Problem 3.034 A closed, rigid tank is filled with water. Initially, the tank holds 0.4 lb...
Problem 3.034
A closed, rigid tank is filled with water. Initially, the tank
holds 0.4 lb of saturated vapor and 4.0 lb of saturated liquid,
each at 212°F. The water is heated until the tank contains only
saturated vapor. Kinetic and potential energy effects can be
ignored.
Determine the volume of the tank, in ft3, the
temperature at the final state, in °F, and the heat transfer, in
Btu.
Five kg of oxygen (O2), initially at 430°C, fills a closed, rigid tank. Heat transfer from...
Five kg of oxygen (O2), initially at 430°C, fills a closed,
rigid tank. Heat transfer from the oxygen occurs at the rate 425 W
for 10 minutes. Assuming the ideal gas model with k
= 1.350 for the oxygen, determine its final temperature, in
°C.
Can't seem to find the right equations to use for this one, so
I'm getting pretty stumped. Any help would be greatly
appreciated
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