Jamil Ibrahim Establishment Building Integration Thermal
Collector BITC By Engineer Khaled Jazzar WEBCO sarl June 2014
Slide 2
Technical Aspect Unglazed collectors Black plastic absorbers
through which water flows. In low temperature applications of
swimming pools, agriculture applications, such systems achieve high
efficiencies of 70 % for low temperature. Glazed flat plate
collectors. Have a slightly lower efficiencies than unglazed
collectors at low temperature, but with higher temperature they
perform significantly better. The average nominal efficiency is 67
% Evacuated tube collectors Collectors with an outer glass mantle
maintaining a vacuum. Two tubes ( feed and return ) or an
adjustable selective fin with a heat pipe. Evacuated tube can reach
the boiling point of water. Have almost constant efficiency of 67 %
across all Temperature differences between inlet and outlet. 2 June
2014
Slide 3
Standard solar thermal systems are mainly used to prepare hot
water in small scale plants. When it comes to applications in the
field of solar space heating, large scale plants in urban building
projects, hotels and solar local heating networks, there are not
always sufficient suitable and oriented roof area available for the
installation of solar collectors. When installing and assembling
those solar panels on existing roofs, the plants often form a
foreign body since they are not an integral part of the
architecture. For this reason solar plants are more and more
presenting challenges to the faade building. Solar faade collectors
are becoming: 1- Integral part of the Architecture. 2- Energy
saving function. Facade collectors can be used as an element for
design buildings as well as Solar thermal contributor to the energy
requirement of a building. Architectural aspect 3 June 2014
Slide 4
What are the constraints in installing solar collectors on
facades: 1- Orientation and Inclination 2- Integration to the faade
3- Resistance. 4- Efficiency. 5- Installation and maintenance. 6-
Decentralized system per floor and per apartment. Type of solar
collectors: Evacuated tube collectors 4 June 2014
Slide 5
Orientation and Inclination Orientation Inclination The optimum
inclination for a solar collector between summer and winter is
about 34 degree. The optimum orientation for a solar collector is
true south. Solution Tubes 360 rotatable (optimate adjustment to
the sun). 5 June 2014
Slide 6
Integration to the faade Solution: Homogeneity in assembling
the solar evacuated tube collectors by respecting the same
configuration over the whole faade even with more than one
collector in a field. 6 June 2014
Slide 7
Resistance The SiO2 layers are baked into the glass, making the
surface highly resistant to abrasion and degradation due to
environmental conditions referred to as weathering. External
coating gives the tubes a high level of resistance to breakage by
flying debris or hail.. 7 June 2014
Slide 8
Efficiency Low in iron. This makes the glass highly
transmissive over the full visible spectrum and continuing on into
the infrared region. Hence, the tube is well suited for the
collection of the full spectrum of solar radiation. Double sided
(Power) coating. A double-sided coating is used in collectors that
are designed for use with reflective surfaces where increased
efficiencies can be realized by collecting reflected energy on the
backside of the absorber. An increase in efficiency of up to 30%
can be realized when a double-coated absorber and a reflective
surface are used. 8 June 2014
Slide 9
Installation and maintenance. Plug-in connection tube manifold
(super easy to assemble without screwing) Self-supporting
construction (no need for an expansive rack) 9 June 2014
Slide 10
Decentralized system per floor and per apartment. The major
advantage when using a centralized system is the reduced heat
losses in the solar circuit between the storage tanks and the solar
panel. In our case we have applied the same concept with available
area on the faade closed to the storage tanks, so the heat losses
are negligible. 10 June 2014
Slide 11
11 June 2014
Slide 12
La Citadelle Solar Testing on site. Date : January and February
2014 ( Two months). Solar Collectors net Aperture Area : 5.88 m2 (
Gross Area 6.6 m2). Solar collectors Inclination : 90 Degree. Hot
Water Storage Tank Capacity : 300 L. Pump Flow : 0.3 m 3 /Hr. 3
Temperature sensors (C) are located, one on the solar panel and 2
in the storage tank. Example : Date 10/02/2014 Weather: Morning:
Sunny. Noon: sunny. After noon: sunny. Outdoor temperature: 20 C.
Reading TimePanelBottom of the tankTop of the tank 8:30 AM3619 1:15
PM614155 3:45 PM48 63 12 Temperature (C)