Question

A rigid, well-insulated tank, with a volume of 0.057 m3 , contains air at p1 = 1.4 bar, T1 = 280 K. The air is stirred by a paddle wheel, resulting in an energy transfer to the gas of magnitude 6.78 kJ. Assuming ideal gas behavior for the air, determine the final temperature, in K, and the final pressure, in bar. Neglect kinetic and potential energy effects

Answer #1

Air is contained in a rigid, well-insulated container
of volume 3 m3. The air undergoes a process from
an initial state with a pressure of 200 kPa and temperature of 300
K. During the process, the air
receives 720 kJ of work from a paddle wheel. Model the air as an
ideal gas with constant specific
heats. Evaluate the specific heats at 300 K. Neglect changes in
kinetic energy and potential energy.
Determine the mass of the air in kg,...

A rigid copper tank, initially containing 1 m3 of air at 295 K,
4 bar, is connected by a valve to a large supply line carrying air
at 295 K, 15 bar. The valve is opened only as long as required to
fill the tank with air to a pressure of 15 bar. Finally, the air in
the tank is at 310 K. The copper tank, which has a mass of 20 kg,
is at the same temperature as the...

Carbon dioxide (CO2) is compressed in a
piston–cylinder assembly from p1 = 0.7 bar,
T1 = 280 K to p2 = 14 bar.
The initial volume is 0.2 m3. The process is described
by pV1.25 = constant.
Assuming ideal gas behavior and neglecting kinetic and potential
energy effects, determine the work and heat transfer for the
process, each in kJ, using constant specific heats evaluated at 300
K, and data from Table A-23.

An initially empty, well insulated, rigid tank with a volume of
2 m3 is fitted with a mixing device. The tank has two inlets and
zero outlets. One inlet is water at 1 MPa and 600◦C while the other
is saturated liquid water. Both enter the tank slowly. If the
amount of work done by the mixing device is 300 kJ, what must the
temperature of the saturated liquid water be if the same mass is
added through both inlets...

Water vapor is cooled in a closed, rigid tank from T1 = 360°C
and p1 = 100 bar to a final temperature of T2 = 320°C. Determine
the final specific volume, v2, in m3/kg, and the final pressure,
p2, in bar.

Water vapor is cooled in a closed, rigid tank from
T1 = 400°C and p1 = 100 bar
to a final temperature of T2 = 320°C.
Determine the final specific volume, v2, in
m3/kg, and the final pressure, p2,
in bar.

Q3. A tank with rigid walls and a volume of
0.05 m3 initially has a two-phase liquid- vapor mixture of ammonia
at a pressure of 4 bar and a quality of 10%. The tank is then
heated such that the pressure is kept constant through a
pressure-regulating valve that allows saturated vapor to escape.
The heating continues until the quality of the mixture in the tank
is 40%. Assume kinetic and potential energy changes are
insignificant. Determine:
(i) The final...

Initially (state 1) a well-insulated rigid tank contains 20 kg
of a saturated liquid-vapor mixture of water at 100 kPa and half of
the mass is in the liquid phase. An electric resistance heater
placed in the tank is now turned on and kept on until all the
liquid in the tank is vaporized (state 2). Determine (a) the
initial specific volume in m3/kg, (b) the final specific
entropy in kJ/kg.K and (c) change of entropy in kJ/K.

A closed, rigid, 0.40 m3 tank is filled with 12 kg of
water. The initial pressure is p1 = 20 bar. The
water is cooled until the pressure is p2= 4
bar.
Determine the initial quality, x1, and the heat
transfer, in kJ.

(10 pts) A 10 m3 rigid storage tank contains oxygen
gas (R = 0.2598 kJ/kg.K, cp = 0.918 kJ/kg.K,
cv = 0.658 kJ/kg.K). The tank is initially 200 kPa and
600o It is cooled to 25oC in 35 minutes.
Determine:
(3 pts) The mass of oxygen in the tank, in kg.
(3 pts) The final pressure in the tank, in kPa.
(4 pts) The rate of heat transfer from the oxygen, in kW.

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