IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C2-A, November 9, 2009
11
Humidity distribution
54
Temperature distribution
10.5
52
10
50
Humidity ratio [g.kg -1 ]
9.5
9
8.5
8
7.5
7
Temperature [ C]
48
46
44
42
40
6.5
model
experimental
6
0 20 40 60 80 100 120 140 160 180
Angular position [ ]
38
36
0 20 40 60 80 100 120 140 160 180
Angular position [ ]
model
experimental
Figure 26: Comparison of the predicted and measured temperature and humidity distribution at
the outlet of the desiccant wheel
The profiles obtained numerically are coherent with the measured profiles and we notice 0.3
g/kg error in the humidity ratio while an error of 2°C in the temperature.
The outlet conditions of the desiccant wheel depend on the temperature and humidity at both
inlets of the wheel. In order to validate the detailed and the simplified models of the wheel
were considered. Different inlet conditions were considered: the inlet temperature of the
process stream varies between 25 and 35°C while the humidity ratio varies between 10 and
15 g/kg and the regeneration temperature was considered varying from 60 to 80°C.
Humidity ratio deviation [g.kg -1 ]
2
1.75
1.5
1.25
1
0.75
0.5
0.25
0
-0.25
-0.5
-0.75
-1
-1.25
-1.5
-1.75
-2
Detailed model
T reg =80
T reg =70
T reg =65
T reg =60
measurement accuracy
-3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3
Temperature deviation [ C]
Figure 27: Comparison of the predicted and measured mean outlet temperature and humidity at
the outlet of the desiccant wheel.
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