Question

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.

Answer #1

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.

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 rigid tank has a volume of 0.01 m3. It
initially contains saturated water at a temperature of 200
oC and a quality of 0.4. The top of the
tank contains a pressure regulating valve which maintains the vapor
at constant pressure. This system undergoes a process where it is
heated until all the liquid vaporizes. How much heat in (kJ) is
required? You may assume there is no pressure drop in the exit
line.

A 0.6-m3 rigid tank is filled with saturated
liquid water at 170
°C. A valve at the bottom of
the tank is now opened, and one-half of the total mass is withdrawn
from the tank in liquid
form. Heat is transferred to water from a source of 210 °C so that
the temperature in the tank
remains constant. Determine (a) the amount of heat transfer and (b)
the reversible work and
exergy destruction for this process. Assume the surroundings to...

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?

Water of mass 2 kg in a closed, rigid tank is initially in the
form of a twophase liquid-vapor mixture. The initial temperature is
50° C. The mixture is heated until the tank contains only saturated
vapor at 110° C.
(i) Find the initial pressure, in kPa.
(ii) Find the work for the process, in kJ.
(iii) Find the heat transfer for the process, in kJ.

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)...

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.

A rigid container of volume 0.2 m3 contains 5 kg of water at 20
◦C. The maximum allowable pressure of the container is set at 10
MPa. The system is now connected to a heat source, which transfers
heat at a rate of 1000 W to the container. How long will the
container survive?

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

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 7 minutes ago

asked 19 minutes ago

asked 27 minutes ago

asked 28 minutes ago

asked 29 minutes ago

asked 44 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago