Question

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

Answer #1

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...

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...

A rigid tank, with a volume of 25 L, contains nitrogen at 355 K and 1.2 MPa. The tank is then cooled to 120 K. What work has been done and the heat transferred in this process? Data: Cv = 0.745 kJ/kgK, Cp = 1.042 kJ/kgK, MM(N2)=28 g/mol, R = 8.314 m^3 Pa/molK.
Use the ratio PV = nRT to determine the amount of nitrogen contained in the tank.

A 0.1-m3 rigid tank contains saturated liquid-vapor mixture of
water, initially at 150 kPa and 52 percent quality. Heat is now
transferred to the tank until the system becomes superheated vapor
and the pressure reaches 300 kPa. Determine (a) the total mass of
the mixture in the tank and (b) the amount of heat transferred.

A 10-m3 vessel is being filled with steam at 0.8 MPa
and 400°C. It enters the tank through a 0.05 m radius pipe.
Calculate the rate at which the density in the tank is varying when
the steam velocity in the pipe is 20 m/s and choose the nearest
value

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 10-m3 vessel is being filled with steam at 0.8 MPa and 400°C.
It enters the tank through a 0.05 m radius pipe. Calculate the rate
at which the density in the tank is varying when the steam velocity
in the pipe is 20 m/s and choose the nearest value
a. None
b. 0.16 (kg/m3)/s
c. 0.08 (kg/m3)/s
d. 0.12 (kg/m3)/s
e. 0.04 (kg/m3)/s

(10 pts) A 10 m3 rigid storage tank contains oxygen
gas (R = 0.2598 kJ/kg.K, cp = 0.918 kJ/kg.K,
cv = 0.658 kJ/kg.K). The tank is initially 200 kPa and
600o It is cooled to 25oC in 35 minutes.
Determine:
(3 pts) The mass of oxygen in the tank, in kg.
(3 pts) The final pressure in the tank, in kPa.
(4 pts) The rate of heat transfer from the oxygen, in kW.

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