Environmental Engineering Reference
In-Depth Information
Figure 10. Experimental Design Schema.
For the evaporative cooler, latent and sensible heat were considered in order to obtain the
total heat recovered. The heat pipe exchanger built only recovers sensible heat from the
airstreams expelled outdoors. The uncertainty values for the characteristics analyzed are
shown in Table 4, where UVi, represent the uncertainty values for each volumetric flow
described.
Table 4. Uncertainty values for the characteristics analyzed: sensible,
latent and total heat (GUM procedures with k=2) [21]
Sensible Heat
Latent Heat
Total Heat
Temperature
(ºC)
U
V1
(%)
U
V2
(%)
U
V3
(%)
U
V1
(%)
U
V2
(%)
U
V3
(%)
U
V1
(%)
U
V2
(%)
U
V3
(%)
25
4.6
5.5
5.8
4.6
5.5
5.9
6.6
7.8
8.3
30
4.5
6.2
5.7
4.6
6.2
5.7
6.4
8.8
8.0
35
4.5
5.2
6.0
4.5
5.2
6.1
6.3
7.3
8.5
40
4.4
5.1
5.4
4.4
5.1
5.4
6.2
7.2
7.6
45
4.3
5.7
5.5
4.3
5.8
5.6
6.1
8.1
7.8
The characteristics analysis was carried in two stages. Firstly, average values of the
single factors and their interactions are given and afterwards, final conclusions are supported
by the variance analysis. The conclusions derived by single factors and interaction values
inspection will not be accepted if the ANOVA analysis do not corroborate them.
