THERMODYNAMICS (LL)-W/ACCESS >CUSTOM<
9th Edition
ISBN: 9781266657610
Author: CENGEL
Publisher: MCG CUSTOM
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Chapter 3.8, Problem 54P
Superheated water vapor at 180 psia and 500°F is allowed to cool at constant volume until the temperature drops to 250°F. At the final state, determine (a) the pressure, (b) the quality, and (c) the enthalpy. Also, show the process on a T-v diagram with respect to saturation lines.
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Q2/ A piston-cylinder device contains steam initially at 1 MPa,
450°C, and 2.5 m3. Steam is allowed to cool at constant
pressure until it first starts condensing. Show the process on a
T-v diagram with respect to saturation lines and determine:
(a) the mass of the steam, (b) the final temperature, and
(c) the amount of heat transfer.
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
(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
Chapter 3 Solutions
THERMODYNAMICS (LL)-W/ACCESS >CUSTOM<
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