CENGEL'S 9TH EDITION OF THERMODYNAMICS:
9th Edition
ISBN: 9781260917055
Author: CENGEL
Publisher: MCG
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Chapter 5.5, Problem 13P
A spherical hot-air balloon is initially filled with air at 120 kPa and 20°C with an initial diameter of 5 m. Air enters this balloon at 120 kPa and 20°C with a velocity of 3 m/s through a 1-m-diameter opening. How many minutes will it take to inflate this balloon to a 17-m diameter when the pressure and temperature of the air in the balloon remain the same as the air entering the balloon?
FIGURE P5–13
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A rigid tank of volume 0.018 m' is connected through a closed valve to a vertical cylinder fitted
with a freely moveable frictionless heavy piston of area 0.02 m. Initially, the rigid tank is filled with
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ambient air pressure is 100 kPa and the gravitational acceleration is 9.81 m/s. It is given that the
2
air can be assumed to behave as an ideal gas with the gas constant R= 0.287 k/kg.K.
(a)
At this initial state, determine the air pressure in the cylinder.
The valve is then slowly opened and left opened, allowing the pressurised air from the rigid tank to
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to rest with the whole connected system reaching its final state of equilibrium. During this entire
process, the air temperature in the rigid tank and the cylinder remains constant at 25 "C.
(b)
Find the mass of the air transferred…
Handwritten answer pls.
Air initially at 100 kPa and 300K undergoes a constant pressure until it reaches a final temperature of 620K
Determine:
The work per kilogram of air
The heat required per kilogram of air
The change in internal energy, in Kj/kg
The change in entropy, kJ/kg-K
Chapter 5 Solutions
CENGEL'S 9TH EDITION OF THERMODYNAMICS:
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