Question

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 and the final state is at 300 kPa with a specific volume of 0.5 m3 /kg?

Answer #2

please ask if any doubt please rate thanks

answered by: anonymous

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 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 mixing tank initially contains 3000 pounds of liquid water.
The tank is fitted with two inlet pipes, one with hot water(90 C)
delivered at a mass flow rate of 0.8 lb/s and the other with cold
water (20C) delivered at a mass flow rate of 1.3 lb/s. Water exits
through a single exit pipe at a mass flow rate of 2.6 lb/s.
What is the temperature of the water delivered by the tank
assuming that it was initially filled...

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...

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

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.

A rigid container with a volume of 2 m3 initially contains 0.05
m3 of liquid and 1.95 m3 of vapor at 125 kPa. Heat is transferred
from a 3000C source to the contents of the vessel until the
pressure in the container reaches 4 MPa. The contents of the vessel
are now cooled in a surrounding temperature of 250C until the
contents reach its initial state.
Determine total entropy generated (Sgen) during the cycle.

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.

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, 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.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 7 minutes ago

asked 18 minutes ago

asked 21 minutes ago

asked 21 minutes ago

asked 24 minutes ago

asked 24 minutes ago

asked 28 minutes ago

asked 28 minutes ago

asked 32 minutes ago

asked 33 minutes ago

asked 38 minutes ago

asked 38 minutes ago