Environmental Engineering Reference
In-Depth Information
Table 19. ANOVA (heating mode)
H
eating Mo
d
e
Factors
DoF
heat
SS
V
%
V
2
253.64
126.82
1.12
T
3
22034.72
7344.91
97.20
VxT
6
381.52
63.59
1.68
Error
0
0.00
0.00
0.00
Total
11
22669.87
2060.90
100.00
Table 20. ANOVA (cooling mode)
C
ooling Mod
e
Factors
DoF
heat
SS
V
%
V
2
3460.31
1730.16
10.12
T
4
29148.66
7287.16
85.24
VxT
8
1587.91
198.49
4.64
Error
0
0.00
0.00
0.00
Total
14
34196.88
2442.63
100.00
Analysis of Results
Temperature
•
Heating Mode: This is the most contributory factor, with a percentage next to 97%.
When the temperature difference between the outdoor and the return airstreams rises,
the sensible heat recovered is higher. The transition between cooling and heating
modes occurs next to temperature level 4. (See figure 7)
•
Cooling Mode: This is again the most contributory factor, since the heat transfer rate
is related to the temperature difference, when the temperature difference between the
outdoor and the return airstreams rises, the sensible heat recovered is higher.
L
ATENT
H
EAT
R
ECOVERED
Latent heat is only recovered by the evaporative cooler device.
In this subsection a detailed analysis for the evaporative cooling system was carried out.
Firstly, the corresponding results for both working modes are shown ( See Figure 26 and 29
and Tables 21-22 and 25), and secondly, these results are studied separately for heating mode
(See Figure 27 and 30 and Tables 23 and 26) and cooling mode (See Figure 28 and 31 and
Tables 24 and 26 ).
