Q.2 An evaporative cooler is used to cool a space which has a sensible heat load of 15 kW and a latent heat load of 4.8 kW. The dry air mass flow rate of the supply air is 1.4 kg/s. The air leaves the cooler with a db-temperature of 18°C and a relative humidity of 100%. The outdoor air db-temperature is 35°C. The pressure is constant at 101.3 kPa. Determine (i) the db-temperature and relative humidity of the space, (ii) the outdoor relative humidity, and (iii) the mass flow rate of water.
Q.2 An evaporative cooler is used to cool a space which has a sensible heat load of 15 kW and a latent heat load of 4.8 kW. The dry air mass flow rate of the supply air is 1.4 kg/s. The air leaves the cooler with a db-temperature of 18°C and a relative humidity of 100%. The outdoor air db-temperature is 35°C. The pressure is constant at 101.3 kPa. Determine (i) the db-temperature and relative humidity of the space, (ii) the outdoor relative humidity, and (iii) the mass flow rate of water.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Q.2 An evaporative cooler is used to cool a space which has a sensible heat load of 15 kW and a latent
heat load of 4.8 kW. The dry air mass flow rate of the supply air is 1.4 kg/s. The air leaves the cooler
with a db-temperature of 18°C and a relative humidity of 100%. The outdoor air db-temperature is
35°C. The pressure is constant at 101.3 kPa. Determine
(i) the db-temperature and relative humidity of the space,
(ii) the outdoor relative humidity, and
(iii) the mass flow rate of water.
100
105
110
115
120 kJ/kg(d.a)
30
95
29
90
85
F-10.0
28
F2.0
8-1.0
*+0.0
27
SENSIBLE HEAT
TOTAL HEAT-
Qt
%3D
26
80
1.0
25
4.0
75
24
70
23
ENTHALPY dH
65
22
HUMIDITY RATIO dw
21
60
20
55
19
50
18
17
45
16
40
15
35
14
30
13
5096
12
25
11
20
40% .
10
15
9.
30%
10
8
7
20%
6
5
10%
-5
3
-10
1
-10
-5
10
15
20
25
30
35
40
45
50
Dry Bulb Temperature, °C. Pressure = 101325 Pa
Humidity Ratio, g/kg(d.a)
%09
%04 >
%08
%06,Y
-1.0
-0.5
0.2.
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