Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781259822674
Author: Yunus A. Cengel Dr., Michael A. Boles
Publisher: McGraw-Hill Education
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Chapter 4.5, Problem 38P
An insulated piston–cylinder device contains 5 L of saturated liquid water at a constant pressure of 175 kPa. Water is stirred by a paddle wheel while a current of 8 A flows for 45 min through a resistor placed in the water. If one-half of the liquid is evaporated during this constant-pressure process and the paddle-wheel work amounts to 400 kJ, determine the voltage of the source. Also, show the process on a P-V diagram with respect to saturation lines.
FIGURE P4–38
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An insulated piston-cylinder device contains 8 L of saturated liquid water
at a constant pressure of 175 kPa. Water is stirred by a paddle wheel while a current of 8 A flows
for 45 min through a resistor placed in the water. If one-half of the liquid is evaporated during this
constant-pressure process and the paddle-wheel work amounts to 400 kJ, determine the voltage of
the source.
H,O
P=constant
w
(5) An insulated piston-cylinder device contains 15 L of saturated liquid water
at a constant pressure of 950 kPa. Water is stirred by a paddle wheel while
a current of 15 A flows for 28 min through a resistor placed in the water.
If 64% of the liquid is evaporated during this constant pressure process and
the paddle-wheel work amounts to 600 kJ, determine the voltage of the
source. Also, show the process on a P-v diagram with respect to saturation
lines.
H2O
P= constant
We
Wsh
An insulated piston-cylinder device contains 4.5 L of saturated liquid water at a
constant pressure of 200 kPa. Water is stirred by a paddle wheel while a current
of 20 A flows for 42 min through a resistor placed in the water. If 36% of the
liquid is evaporated during this constant pressure process and the paddle-wheel
work amounts to 280 kJ, determine the voltage of the source. Also, show the
process on a P-v diagram with respect to saturation lines.
H₂O
= constant
W
P=
Wh
4
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Chapter 4 Solutions
Thermodynamics: An Engineering Approach
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