Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781260048766
Author: CENGEL
Publisher: MCG
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Chapter 4.5, Problem 36P
A piston–cylinder device contains 0.5 lbm of water initially at 120 psia and 2 ft3. Now 200 Btu of heat is transferred to the water while its pressure is held constant. Determine the final temperature of the water. Also, show the process on a T-v diagram with respect to saturation lines.
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(9)A piston-cylinder device initially contains steam at 5 MPa and 450°C.
Now, steam loses heat to the surroundings and the piston moves down
hitting a set of stops at which point the cylinder contains saturated vapor
water. The cooling continues until the cylinder contains water at 180°C.
Show the process on a T-v diagram with respect to saturation lines showing
the three states it passes through. Also, put the values of temperature,
pressure and specific volume for each state on the figure.
Steam
A piston-cylinder device contains 0.8 kg of steam at 300°C and 3 MPa. Steam is cooled
constant pressure until its temperature reaches 150 °C. Show the process on T-v & P-
diagram with respect to saturation lines.
300°C
1000kPa
150°C
Water initially at 200 kPa and 300°C is contained in a piston-cylinder device fitted
with stops. The water is allowed to cool at constant pressure until it exists as a saturated vapor
and the piston rests on the stops. Then the water continues to cool until the pressure is 100 kPa.
On the T-u diagram sketch, with respect to the saturation lines, the process curves passing
through both the initial, intermediate, and final states of the water. Label the T, P and v values
for end states on the process curves. Find the overall change in internal energy between the
initial and final states per unit mass of water.
Water
200 kPa
300°C
Chapter 4 Solutions
Thermodynamics: An Engineering Approach
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The...
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