Civil Engineering Reference
In-Depth Information
energy was converted into thermal energy and transported into the building, as
shown in Fig.
13
.
In Denmark, the SolarVenti units are mainly used for providing ventilation and
supplementary heating and assisting in air dehumidification. The larger-capacity
SolarVenti models have substantial thermal energy output and can drive significant
amount of air due to the effect of the buoyancy force. The thermal energy is
captured directly from solar radiation across the spectrum and can be used to
supplement the existing space-heating system in any domestic or commercial
building. Table
4
provides the energy outputs for different SolarVenti models.
The Canadian 'Conserval Engineering Inc' provides the SolarWall and the
rooftop SolarDuct products. The SolarWall is a proprietary solar air-heating sys-
tem that can heat up building using ventilation air and also be amounted on walls
or roofs for various purposes including heating up buildings and running agri-
cultural and manufacturing drying-up process. The SolarWall is a PV/T-combined
system that has significantly lower payback period than a PV system. It can
produce up to 400 % more usable energy than a solely PV system. The SolarDuct
PV/T is a modular rooftop system with total operating efficiency of above 50 %
where the thermal panels have doubled the output from the PV racking system.
Figure
14
indicates the product series available in this company.
The Dutch-based 'PVTWINS' developed the PV/T water-heating products for
niche market, as shown in Fig.
15
. The PV/T water collectors can be used in
individual and collective domestic hot water systems. This PV/T type can achieve
a temperature as high as 90 C. The electrical yield is measured with 125 Wp/m
2
,
Table 4
Energy output of different SolarVenti models (Zhang et al.
2012
)
Model
Air volume
(m
3
/H)
Temperature
increase (C)
Max output kW
(per h)
Max output kW per year
(1,000 h sun)
SV14
60
*30
0.6
600
SV30
120
*40
1.6
1,600
SV30H
100
*40
1.3
1,300
Fig. 14
The solar air PV/T products of 'Conserval Engineering' company (Zhang et al.
2012
)
