An open container containing 0.205 lb of liquid water is placed in an empty room 5 ft wide, 4 ft deep, and 7 ft high, which initially contains dry air at 90 °F. All the water evaporates without modifying the ambient temperature. Use the psychometric diagram to estimate the final relative humidity, wet bulb temperature, wet volume, dew point temperature, and specific enthalpy of the room air. Assume that the molecular weight of dry air is 29 and, for simplicity, assume that the mass of dry air in the room remains constant and equal to its initial value. - Enthalpy at saturation,Btu per pound of dry airGrains of Pounds ofmoistureper pound per poundof dry air of dry airmoisture859095100105180TF.025170024160023E.022150.021140020019130018120017.016110015100E.01460%90F.01302 Btu-0128050%0111970F01040%009A56030%.0085035F.0073020%.00625+0.1 Btu4080%Wet Bulb,Dew Point orSaturationТеmperaturepos60%+0.2 Btu3040%+0.3 Btu00410%20%+0.4 Bu00320Dry Bulb2025+0.5 Btu303540002455055106065707500180Dry Bulb Temperature, °FFIGURE 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 Carricr Corporation.)859095100105110Humid Volume, ft/lb Dry Air13 14 15161720 21 22 23 24 25 2628 29 30 31 32 33 34 35 36 37 38 39 4090% Relative humidity04 Btu80%70%-06 Bu08 Btu13 BEnthalpy deviation

Mass of water in the open container, mW = 0.205 lb Dimensions of the empty room, W = 5 ft, H = 7 ft,…

Answered: An open container containing 0.205 lb…

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

Problem 1.1P

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An open container containing 0.205 lb of liquid water is placed in an empty room 5 ft wide, 4 ft deep, and 7 ft high, which initially contains dry air at 90 °F. All the water evaporates without modifying the ambient temperature. Use the psychometric diagram to estimate the final relative humidity, wet bulb temperature, wet volume, dew point temperature, and specific enthalpy of the room air. Assume that the molecular weight of dry air is 29 and, for simplicity, assume that the mass of dry air in the room remains constant and equal to its initial value.

- Enthalpy at saturation,
Btu per pound of dry air
Grains of Pounds of
moisture
per pound per pound
of dry air of dry air
moisture
85
90
95
100
105
180T
F.025
170
024
160
023
E.022
150
.021
140
020
019
130
018
120
017
.016
110
015
100
E.014
60%
90
F.013
02 Btu
-012
80
50%
011
19
70
F010
40%
009
A5
60
30%
.008
50
35
F.007
30
20%
.006
25
+0.1 Btu
40
80%
Wet Bulb,
Dew Point or
Saturation
Теmperature
pos
60%
+0.2 Btu
30
40%
+0.3 Btu
004
10%
20%
+0.4 Bu
003
20
Dry Bulb
20
25
+0.5 Btu
30
35
40
002
45
50
55
10
60
65
70
75
001
80
Dry Bulb Temperature, °F
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 Carricr Corporation.)
85
90
95
100
105
110
Humid Volume, ft/lb Dry Air
13 14 15
16
17
20 21 22 23 24 25 26
28 29 30 31 32 33 34 35 36 37 38 39 40
90% Relative humidity
04 Btu
80%
70%
-06 Bu
08 Btu
13 B
Enthalpy deviation

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