2011 International Conference on Alternative Energy in Developing Countries and Emerging Economies
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a.
b.
Fig. 10. Effect of water temperature on moisture gain in the air and
moisture loss in solution a. water flow rate at 200 kg.hr
-1
b. water flow
rate at 300 kg.hr
-1
(Conditions: m
a
=765 kg.hr
-1
, V
s
=0.01 l.s
-1
, T
wb
=28
○
C,
T
db
= 36
○
C).
3) Effects of air temperature and flow rate on moisture
removal
Fig. 11 shows how the moisture removal rate is
affected by air dry bulb temperature. Both Fig. 11a and
11b show a similar trend of moisture movement rate.
When the bulb temperature increases, the rate of moisture
movement is higher. In both graphs the moisture gain
appears higher than moisture loss with the average 0.3
g.s
-1
for Fig. 11a and 0.1 g.s
-1
for Fig. 11b. The reason is
discussed as before.
a.
b.
Fig. 11. Effect of air dry bulb temperature on moisture gain in the air
and moisture loss in solution, a. water flow rate at 200 kg.hr
-1
b. water
flow rate at 300 kg.hr
-1
(Conditions: m
a
= 765 kg.hr
-1
, V
s
= 0.01 l.s
-1
,T
w
= 80
○
C, T
wb
= 28
○
C).
Fig. 12 shows the wet bulb temperature effect on
moisture removal rate. These graphs show the similar
trend with the concentration change (Fig. 7) which is
affected by the same condition. A higher wet bulb
temperature causes a lower rate of moisture removal.
Both Fig. 12a and 12b show that the moisture gain is
higher then moisture loss by an average of around 0.2
g.s
-1
a.
b.
Fig. 12 Effect of wet bulb temperature on moisture gain in the air and
moisture loss in solution a. water flow rate at 200 kg.hr
-1
b. water flow
rate at 300 kg.hr
-1
(Conditions: m
a
= 765 kg.hr
-1
, V
s
= 0.01 l.s
-1
, T
w
=
80
○
C, T
db
= 36
○
C).
The effect of air flow rate has only minimal effect on
moisture removal rate even though both the moisture gain
and loss have quite constant rate of moisture movement.
-0.5
0.0
0.5
1.0
1.5
45 50 55 60 65 70 75 80 85
Moistureremoval rate
g.s
-1
Water temperature
○
C
Moisture gain
Moisture loss
0.0
0.5
1.0
1.5
2.0
45
55
65
75
85
Moisture removal rate
g.s
-1
Water temperature
○
C
Moisture gain
Moisture loss
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
30
35
40
45
50
55
Moistureremoval rate
g.s
-1
Dry bulb temperature
○
C
Moisture gain
Moisture loss
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
30
35
40
45
50
55
Moistureremoval rate
g.s
-1
Dry bulb temperature
○
C
Moisturegain
Moisture loss
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
18
20
22
24
26
28
30
Moistureremoval rate
g.s
-1
Wet bulb temperature
○
C
Moisturegain
Moisture loss
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
18
20
22
24
26
28
30
Moistureremoval rate
g.s
-1
Wet bulb temperature
○
C
Moisturegain
Moisture loss
