Question

Heat flow between connected tanks.

Two identical tanks, each with volume 0.250m3,contain steam. Tank A contains 2.5 kg ofsteam at 400 C. Tank B contains 2.5 kg of steam at10 bar.

a. Determine the pressure in tank A. If the state is a vapor/liquid mixture, determine the mass fraction of the vapor.

b. Determine the temperature in tank B. If the state is a vapor/liquid mixture, determine the mass fraction of the vapor.

c. The two tanks are linked with a pipe and their contents are allowed to mix. The tanks are then heated or cooled, as needed, until their contents become saturated vapor. Determine the amount of heat and whether it is to be added to or removed from the tanks.

Answer #1

A rigid tank contains steam at 120 bar, 350C. The tank is cooled
until its contents become saturated vapor. Determine the
temperature and pressure at the final state
Please use interpolation to do this problem

A sealed rigid tank .4m^3 filled with steam at 6.5 bar and is at
300 o C. It is cooled until contents become saturated vapor. Find
mass of steam, final T/P of tank, and how much heat must be removed
if cooling is reversible??

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...

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 tank having a volume of 0.85 m^3 initially contains water as a
two-phase liquid vapor mixture at 260 C and a quality of 0.7.
Saturated water vapor at 260 C is slowly withdrawn through a
pressure-regulating valve at the top of the tank as energy is
transferred by heat to maintain the pressure constant in the tank.
This continues until the tank is filled with saturated vapor at 260
C. Determine the amount of heat transfer in kJ. Neglect...

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.

Synthesis gas may be produce by the catalyst reforming of
methane with steam. The
reactions are:
CH4 + H2O → CO + 3H2
CO + H2O → CO2 + H2
A small plant is being to produce 1000 mol/s of hydrogen (H2) by
the reactions. 280
mol/s of Methane with 100 % of excess steam (excess % relative
to the reaction one)
are fed to the heat exchanger at 150 °C and heated with
superheated vapor. The
superheated vapor inlet...

Steam is contained in a closed rigid container with a volume of
2 m3 . Initially, the pressure and the temperature of the steam are
7 bar and 400°C, respectively. The temperature drops as a result of
heat transfer to the surroundings. i. Determine the temperature at
which the condensation first occurs in °C. [6 marks] ii. Evaluate
the fraction of the total mass that has condensed when the pressure
reaches 0.75 bar. [4 marks] iii. Calculate the volume in...

Steam is contained in a closed rigid container with a volume of
2 m3 . Initially, the pressure and the temperature of the steam are
7 bar and 400°C, respectively. The temperature drops as a result of
heat transfer to the surroundings. i. Determine the temperature at
which the condensation first occurs in °C. [6 marks] ii. Evaluate
the fraction of the total mass that has condensed when the pressure
reaches 0.75 bar. [4 marks] iii. Calculate the volume in...

Consider a container divided by a partition into two chambers. The
first chamber contains 15kg of water at 350°C, 1.2 MPa. The other
chamber contains 19kg of water at 105°C with 60 percent of the mass
is in the liquid phase. The partition is now removed and the water
in both chambers are allowed to mix until the system reaches a
thermal equilibrium of 120°C.
Determine (a) the final pressure in the container
(b) the vapor mass fraction at the...

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