Numerical and experimental analysis of the energy saving and potential of ventilation of opaque ventilates facades
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Author
Peci López, Fernando
Director/es
Ruiz de Adana, ManuelPublisher
Universidad de Córdoba, Servicio de PublicacionesDate
2013Subject
Ahorro energéticoConsumo energético
OVF (Opaque Ventilated faÇade)
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Nowadays the efficient use of energy is a crucial necessity. Buildings are among the
greater energy consumers in a country and the ventilation and HVAC systems account
for a high percentage of this consumption. A way of reducing the energy consumption
of these systems is taking advantage of the renewable energies available. In this
document an opaque ventilated façade (OVF) was studied. An OVF takes advantage of
the wind force and solar radiation to provide the indoor space with free ventilation and
air preheating. The objectives of the study were: find evidence of this possible
advantages, quantify the potential of an OVF to provide ventilation and heating in
different situations and study the sensibility of the system to variation of the most
important parameters. For this purpose an experimental module of OVF was built and
monitorized, and a model was configurated and validate with the experimental data.
With this model, simulations were carried out to study the performance of the OVF with
the variations of estimated parameters and design parameters. It was also tested the
performance of the OVF under different climatic conditions in several climatic areas of
Spain. The results showed that for any climatic zone the OVF could provide buildings
with free ventilation. However the flow rates yielded weren’t sufficient to meet the
regulation requirement so this system would require mechanical ventilation support.
The results also showed that the heating energy consumption could be reduced by two
means: preheating the ventilation air and introducing ventilation air in non occupancy
periods at a convenient temperature. From the sensibility study it could be concluded
that the external and internal convection coefficients, and the solar absortivity were key
parameters for predicting the energy savings an OVF could provide.