Question

consider a rigid tank that contains 0.1 kg of air at 27 degrees C.
Now heat is transfered to the air unit until the temperature
increases by 50 degrees C. determine heat transfer in kJ/kg

a.100

b.0.5

c.35.98

d.0

Answer #1

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
piston-cylinder device contains 3.2 kg of air at 400 kPa and 10°C.
Heat is transfered to air and the piston is allowed to expand at
constant pressure until its temperature reaches 50°C. The work done
during this expansion process is: Use kj units

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 rigid tank contains 20lbm of air at 80ºF and 35
psig. Heat is added until the pressure doubles to 70 psig.
Rair = 0.3704 psia-ft3/lbm-R
Draw the P-v and T-v diagrams for the problem.
What is the volume of the tank ft3?
What is final temperature of the air in ºF?
How much heat is transferred in the process in Btu?

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 rigid copper tank, initially containing 1 m3 of air at 295 K,
4 bar, is connected by a valve to a large supply line carrying air
at 295 K, 15 bar. The valve is opened only as long as required to
fill the tank with air to a pressure of 15 bar. Finally, the air in
the tank is at 310 K. The copper tank, which has a mass of 20 kg,
is at the same temperature as the...

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, 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.

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