16 de August de 2016 | Ana Amelia Patiño Esteo | , Blog
For health and comfort it is necessary an HVAC system, because having a control of the temperature and air quality is required, so the metabolism of the people that use it, their activity and many other components do that the air quality get worse or affect to the users health that are located in the room.
As we saw previously there are natural systems in HVAC ones, in this case crossed ventilation, that take advantage of the natural air currents to renew air (as is required by the Código Técnico de la Edificación in its Documento Básico de Salubridad and in its Documento Básico de seguridad de Utilización y Accesibilidad).
So it is important to do an evaluation of the place it is going to be installed this kind of HVAC.

For that it is necessary to know the building orientation, its natural currents generated near it and the weather of that place, in every season, with the principal winds, their speed and the median temperature of the air.
Once we know these information, we can evaluate if natural ventilation could be possible, by itself or with another kind of system that complement that, getting a more renewable, clean and alternative energy that guarantee comfort to every user.
In that way natural ventilation can be used, whose definition by the IDAE is the use of the natural currents to replace the dirty air for another new to regulate humidity and dirtyness level of the air, to achieve ideal conditions of the enviroment. We find a concept used in bioclimatic architecture called passive refreshment of the buildings.
One of those natural ventilation system is crossed ventilation, generated by air currents, so building orientation is a key, because the predominant currents of the place do that resultant pressures in the fronts of the building help to its ventilation system.
Another point to have in mind are vains, that have to be orientated strategically to use high and low pressures that predominant winds generate. Aswell it is important to create flows with optimal speed based in the modulity and the size of the vains.
Definitely there are natural climatical systems, that with a correct studio of the place in which the rebuild is going to be taken a more susteinable bussiness or home, in which, as we talked in previous posts, mind is the most important tool.
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