IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C2-A, November 9, 2009
75
Collectors outlet temperature
60
Tank bottom temperature
59
70
58
57
Temperature [ C]
65
60
Temperature [ C]
56
55
54
53
55
52
calculated
measured
50
12 13 14 15 16 17 18
65
64
63
Time [hours]
Tank top temperature
51
calculated
measured
50
12 13 14 15 16 17 18
60
59
58
Time [hours]
Regeneration temperature
62
57
Temperature [ C]
61
60
59
58
Temperature [ C]
56
55
54
53
57
52
56
calculated
measured
55
12 13 14 15 16 17 18
Time [hours]
51
calculated
measured
50
12 13 14 15 16 17 18
Time [hours]
Figure 15: Comparison of the predicted temperature with the measured one for the collectors
outlet, storage top, storage bottom, and regeneration air
Figure 16 compares the measured outlet conditions of the desiccant wheel to those predicted
by the model. The profiles of the temperature and humidity ratio are very well predicted by
the model during the whole day. For the measured temperature we noticed some peaks et
we can count 7 peaks per hour and for each peak in the temperature corresponds a
minimum in the outlet humidity of the wheel. Or the angular speed of the wheel is 7 rounds
per hour this mean for each revolution of the wheel corresponds a peak. The reason behind
this behaviour is a probable anomaly in the desiccant wheel with a sector having more
desiccant and yields more dehumidification this mean an increase in the outlet temperature
of the wheel. It is evident that the desiccant does not take into account this anomaly.
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