Question

Water vapor is cooled in a closed, rigid tank from
*T*_{1} = 400°C and *p*_{1} = 100 bar
to a final temperature of *T*_{2} = 320°C.

Determine the final specific volume, *v*_{2}, in
m^{3}/kg, and the final pressure, *p*_{2},
in bar.

Answer #1

**(a)**

Using Table A-4 (Superheated water);

- at P
_{1}= 100 bar and T_{1}= 400^{o}C

v_{1} = 0.02641
m^{3}/kg

For a closed and rigid cylinder, the volume remains constant;

v_{2} = v_{1} =
constant

=> v_{2} = 0.02641
m^{3}/kg

**...(Answer)**

**______________________________________________________________**

**(b)**

Using Table A-4 (Superheated water);

- at T
_{1}= 320^{o}C and v_{2}= 0.02641 m^{3}/kg, by interpolating between 80 bar and 100 bar;

**...(Answer)**

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.

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.

2- A certain amount of H2O in a closed rigid cylinder is cooled
from T1 = 800 ° F and P1 = 100 lbf / in2 to P2 = 20 lbf / in2.
Determine the specific entropy change in Btu / (lb ° R).

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

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 closed, rigid tank is filled with water. Initially, the tank
holds 1.0 lb of saturated vapor and 7.0 lb of saturated liquid,
each at 212°F. The water is heated until the tank contains only
saturated vapor. Kinetic and potential energy effects can be
ignored. Determine the volume of the tank, in ft3, the temperature
at the final state, in °F, and the heat transfer, in Btu.

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.

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.

Water, initially saturated vapor at 14.6 bar, fills a closed,
rigid container. The water is heated until its temperature is
200°C. For the water, determine the heat transfer, in kJ/kg.
Kinetic and potential energy effects can be ignored.

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