Question

- (10 pts) A 10 m
^{3}rigid storage tank contains oxygen gas (R = 0.2598 kJ/kg.K, c_{p}= 0.918 kJ/kg.K, c_{v}= 0.658 kJ/kg.K). The tank is initially 200 kPa and 600^{o}It is cooled to 25^{o}C 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.

Answer #1

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 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

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 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 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 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

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.

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.

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.

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