Q2) Air at 1 atm, 18 °C, and 50 percent relative humidity is first heated to 40 °C in a heating section and then adiabatically saturated (at constant wet bullb temperature) by introducing water vapor. The air leaves the humidifying section at 80 percent relative humidity. Mass flow rate of the air is 0.1 kg/s.

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01992 American Society of Heating,
Refrigerating and Air-Conditioning Engineers, Inc.
.0.36
Sea Level
100
IT 10
10.0t4
06
1.0T-E
0.40
-5.0
-20
5.0 +os
104
Sensible heat
Total heat
00
90
10
-L0
4.0
0.45
110
Einthalpy
Humidity ratio
0.50
25
-0.55
100
Enthaby (k) kilojoules per kilogram dry tir
0.60
to
0.65
0.70
0.75
15
0.80
30
O.RS
80
0.90
0.95
10.
-1.0
20
70
20%
10% relaive buidity
60
10
40
Dry bulb temperature "C
50
Humidity ratio ( grums n
Sensihle heat DH;
Transcribed Image Text:01992 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. .0.36 Sea Level 100 IT 10 10.0t4 06 1.0T-E 0.40 -5.0 -20 5.0 +os 104 Sensible heat Total heat 00 90 10 -L0 4.0 0.45 110 Einthalpy Humidity ratio 0.50 25 -0.55 100 Enthaby (k) kilojoules per kilogram dry tir 0.60 to 0.65 0.70 0.75 15 0.80 30 O.RS 80 0.90 0.95 10. -1.0 20 70 20% 10% relaive buidity 60 10 40 Dry bulb temperature "C 50 Humidity ratio ( grums n Sensihle heat DH;
Q2) Air at 1 atm, 18 °C, and 50 percent relative humidity is first heated to 40 °C in a heating section and then
adiabatically saturated (at constant wet bulb temperature) by introducing water vapor. The air leaves the
humidifying section at 80 percent relative humidity. Mass flow rate of the air is 0.1 kg/s.
| Heating
coils
www
1 atm
T = 18°C
Ø = 50%
3 = 80%
T; = ?
AIR
T;= 40°C
(a) show the process on a psychrometric chart,
(b) determine the amount of steam added to the air (m,) in the humidifying section,
(c) determine the amount of heat transfer to the air (Qm) in the heating section,
(d) determine the dry bulb temperature of outlet air (T;) from the humidifying section.
Transcribed Image Text:Q2) Air at 1 atm, 18 °C, and 50 percent relative humidity is first heated to 40 °C in a heating section and then adiabatically saturated (at constant wet bulb temperature) by introducing water vapor. The air leaves the humidifying section at 80 percent relative humidity. Mass flow rate of the air is 0.1 kg/s. | Heating coils www 1 atm T = 18°C Ø = 50% 3 = 80% T; = ? AIR T;= 40°C (a) show the process on a psychrometric chart, (b) determine the amount of steam added to the air (m,) in the humidifying section, (c) determine the amount of heat transfer to the air (Qm) in the heating section, (d) determine the dry bulb temperature of outlet air (T;) from the humidifying section.
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