For point 1, I cannot locate the humidity and enthalpy.  For point 2, I cannot locate the humidity and enthalpy.  Where do you locate these on the graph.  The graph is provided for this.

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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For point 1, I cannot locate the humidity and enthalpy.  For point 2, I cannot locate the humidity and enthalpy.  Where do you locate these on the graph.  The graph is provided for this.  

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PDF Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X +
58°F
Sunny
File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf
Draw
T Read aloud
Wet Bulb,
Dew Point or
Saturation
Temperature
Dry Bulb 20
25
==
i
Q Search
2
23
=
S
55
24
454 of 695
8
%
60
A
3
65
R
R
#
9:
2
Dry Bulb Temperature, F
1
4
$.
5.
2.
7
CD
Enthalpy at saturation,
of dry air
per
85
Humid Volume, ft/lb Dry Air
95
Grains of Pounds of
moisture
mais
moisture
per pound.
per pound
of dry air
of dry air
105
110
025
120017
90
024
014
70010
006
002
FIGURE 8.4-2 Psychrometric chart-U.S. customary units. Reference states: H₂O (liquid, 32°F, 1 atm), dry air (0°F, 1 atm). (Data obtained from Carrier Corporation.)
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Transcribed Image Text:||! PDF Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + 58°F Sunny File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf Draw T Read aloud Wet Bulb, Dew Point or Saturation Temperature Dry Bulb 20 25 == i Q Search 2 23 = S 55 24 454 of 695 8 % 60 A 3 65 R R # 9: 2 Dry Bulb Temperature, F 1 4 $. 5. 2. 7 CD Enthalpy at saturation, of dry air per 85 Humid Volume, ft/lb Dry Air 95 Grains of Pounds of moisture mais moisture per pound. per pound of dry air of dry air 105 110 025 120017 90 024 014 70010 006 002 FIGURE 8.4-2 Psychrometric chart-U.S. customary units. Reference states: H₂O (liquid, 32°F, 1 atm), dry air (0°F, 1 atm). (Data obtained from Carrier Corporation.) {" Ơ Ⓡ 63 + 60 D ENG Sign in (0) + O 7:38 AM 5/22/2023
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PDF Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X +
58°F
Sunny
File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf
Draw
T Read aloud
8.70
+
458 of 695 (2) OD
Note: In labeling the outlet gas stream, we have implicitly written a balance on dry air.
Degree-of-Freedom Analysis:
Point 1:
Point 2:
7 unknowns (m₁, m₂, m3, Ĥ₁, Ĥ₂, Ĥ3, Q)
-1 material balance (H₂O-dry air is already balanced on the chart)
-2 absolute humidities from psychrometric chart (for inlet and outlet air)
-2 enthalpies from psychrometric chart (for inlet and outlet air)
Balance on H₂O:
-1 enthalpy of condensate (from known heat capacity of liquid water)
-1 energy balance
= 0 degrees of freedom
Fraction H₂0 Condensed:
Q Search
80°F
80% RH
m₁ =
Figure 8.4-2
1.0 lbm DA
Saturated
m₂ =
51°F Figure 8.4-2
1.0 lbm DA
m₁ = m₂ + m3
0.018 lbm H₂O
lbm DA
ha = 0.018 lb H₂O/lbm DA
Ĥ₁ = 38.8 Btu/lbm DA
0.010 lbm condensed
0.018 lbm fed
RHirelative
haridity
0.0079 lbm H₂O
lbm DA
m₁ = 0.018 lbm
m₂ = 0.0079 lbm
m3 = 0.010 lb, H₂O condensed
H
h₁ = 0.0079 lbm H₂O/lbm DA
Ĥ₂ = 20.9 Btu/lbm DA
0.555
= 0.018 lbm H₂O
12 In assuming this basis, we are temporarily ignoring the specification of the volumetric flow rate at the outlet. After the
process is balanced for the assumed basis, we will scale up to an outlet flow rate of 1000 ft³/min.
= 0.0079 lbm H₂O
pa
Enthalpy of Condensate
Since the reference condition for water on Figure 8.4-2 is liquid water at 32°F, we must use the same condition
8.4 Phase-Change Operations 439
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Transcribed Image Text:||! PDF Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + 58°F Sunny File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf Draw T Read aloud 8.70 + 458 of 695 (2) OD Note: In labeling the outlet gas stream, we have implicitly written a balance on dry air. Degree-of-Freedom Analysis: Point 1: Point 2: 7 unknowns (m₁, m₂, m3, Ĥ₁, Ĥ₂, Ĥ3, Q) -1 material balance (H₂O-dry air is already balanced on the chart) -2 absolute humidities from psychrometric chart (for inlet and outlet air) -2 enthalpies from psychrometric chart (for inlet and outlet air) Balance on H₂O: -1 enthalpy of condensate (from known heat capacity of liquid water) -1 energy balance = 0 degrees of freedom Fraction H₂0 Condensed: Q Search 80°F 80% RH m₁ = Figure 8.4-2 1.0 lbm DA Saturated m₂ = 51°F Figure 8.4-2 1.0 lbm DA m₁ = m₂ + m3 0.018 lbm H₂O lbm DA ha = 0.018 lb H₂O/lbm DA Ĥ₁ = 38.8 Btu/lbm DA 0.010 lbm condensed 0.018 lbm fed RHirelative haridity 0.0079 lbm H₂O lbm DA m₁ = 0.018 lbm m₂ = 0.0079 lbm m3 = 0.010 lb, H₂O condensed H h₁ = 0.0079 lbm H₂O/lbm DA Ĥ₂ = 20.9 Btu/lbm DA 0.555 = 0.018 lbm H₂O 12 In assuming this basis, we are temporarily ignoring the specification of the volumetric flow rate at the outlet. After the process is balanced for the assumed basis, we will scale up to an outlet flow rate of 1000 ft³/min. = 0.0079 lbm H₂O pa Enthalpy of Condensate Since the reference condition for water on Figure 8.4-2 is liquid water at 32°F, we must use the same condition 8.4 Phase-Change Operations 439 {" Ơ Ⓡ J 63 60 D ENG Sign in (0) + O 7:39 AM 5/22/2023
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