Question

A rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries steam at 1 MPa and 300°C. Now the valve is opened,and steam is allowed to flow slowly into the tank until the pressure reaches 1 MPa, at which point the valve is closed. Find the rate of entropy production.

Answer #1

A rigid, well-insulated tank contains 100 kg of liquid water at
21°C. The tank is connected through a valve to a steam main where
the pressure is 1 MPa. The valve is opened and steam enters the
tank until the water temperatuere rises to 65 °C, at which time the
valve is closed. It is determined that there are now 107.96 kg of
water in the tank. Estimate the quality of steam in the main.

A rigid, insulated vessel is divided into two compartments
connected by a valve. Initially, one compartment, occupying 1.0
ft3, contains air at 50 lbf/in2,
500oR, and the other, occupying 2.0 ft3, is
evacuated. The valve is opened and the air is allowed to fill both
volumes. Assume the air behaves as an ideal gas and that the final
state is in equilibrium.
Determine the final temperature of the air, in oR, and
the amount of entropy produced, in Btu/oR.

A rigid, insulated vessel is divided into two compartments
connected by a valve. Initially, one compartment, occupying 1.0
ft3, contains air at 50 lbf/in2, 725oR, and the other, occupying
2.0 ft3, is evacuated. The valve is opened and the air is allowed
to fill both volumes. Assume the air behaves as an ideal gas and
that the final state is in equilibrium. Determine the final
temperature of the air, in oR, and the amount of entropy produced,
in Btu/oR.
Determine...

Two insulated containers are connected through an insulated line
and a valve that is closed. Both sides contain 1 kg of steam but
the left side is at 300 °C while the right side is at 200 °C. The
valve is opened, allowing both sides to mix and reach a common
temperature and pressure.
a) Is this process reversible?
b) What is the final pressure and temperature of the steam, if the
steam is treated as an ideal gas?
c)...

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...

A 1.2 m3 rigid tank initially contains steam at 8 MPa and 400
◦C. The steam slowly comes out through a hole at the bottom until
the pressure drops to P0 while
keeps the temperature constant. Making the pertinent considerations
determines:
a) the heat transferred, in kJ when P0 = 2 MPa.
b) graph the heat transfer, in kJ, versus P0 from 0.5 to 8.0
MPa

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.

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 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...

A rigid insulated tank is divided into two parts, one that
contains 1 kg of steam at 10 bar, 200 °C, and one that contains 1
kg of steam at 20 bar, 800 °C. The partition that separates the two
compartments is removed and the system is allowed to reach
equilibrium. What is the entropy generation?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 6 minutes ago

asked 9 minutes ago

asked 11 minutes ago

asked 15 minutes ago

asked 18 minutes ago

asked 26 minutes ago

asked 29 minutes ago

asked 34 minutes ago

asked 46 minutes ago

asked 58 minutes ago

asked 58 minutes ago

asked 1 hour ago