EXAMPLE 4.21 Energy Balance Ten pounds of water at 35°F, 4.00 lb of ice at 32°F, and 6.00 lb of steam at 250°F and 20 psi are mixed together in a container of fixed volume. What is the final temperature of the mix ture? How much steam condenses? Assume that the volume of the vessel is constant with value equal to the volume of the steam and that the vessel is insulated. Sec. 4.5 The Genera! Energy Balance System boundary 10 Ib water Final Mixture 6 Ib steam 4 ib ice Figure E4.21 AÂU (Btu/lb) p (psia) T (F) Ice Water -143.6* 3.02 1168 32 0.0162 20.81 35 Steam 20 250 *Heat of fusion (pressure and volume have no significant effect).
EXAMPLE 4.21 Energy Balance Ten pounds of water at 35°F, 4.00 lb of ice at 32°F, and 6.00 lb of steam at 250°F and 20 psi are mixed together in a container of fixed volume. What is the final temperature of the mix ture? How much steam condenses? Assume that the volume of the vessel is constant with value equal to the volume of the steam and that the vessel is insulated. Sec. 4.5 The Genera! Energy Balance System boundary 10 Ib water Final Mixture 6 Ib steam 4 ib ice Figure E4.21 AÂU (Btu/lb) p (psia) T (F) Ice Water -143.6* 3.02 1168 32 0.0162 20.81 35 Steam 20 250 *Heat of fusion (pressure and volume have no significant effect).
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Transcribed Image Text:EXAMPLE 4.21 Energy Balance
Ten pounds of water at 35°F, 4.00 lb of ice at 32°F, and 6.00 lb of steam at 250°F and 20 psia
are mixed together in a container of fixed volume. What is the final temperature of the mix-
ture? How much steam condenses? Assume that the volume of the vessel is constant with a
value equal to the volume of the steam and that the vessel is insulated.
Sec. 4.5
The General Energy Balance
System
boundary
10 Ib water
Final
Mixture
6 lb steam
4 ib ice
Figure E4.21
AÂU (Btu/lb}
p (psia)
T (F)
-143.6*
3.02
1168
Ice
32
35
Water
0.0162
20.81
Steam
20
250
*Heat of fusion (pressure and volume have no significant effect).
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