CoDyBa - Sample 2

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Geometry The geometry is described on the following drawing :

The geometry corresponds to an office building with 7 floors. Each stage includes 10 offices, 5 per face. A corridor separates the offices. The stairwells are located at the ends of the building. Walls are made of concrete, with an insulation on the internal face. The building has a symmetry such as a rotation of 180 makes it identical to itself.

The set-point of the heating system is fixed at 18 C, this of the cooling system at 27 C (only for the offices). There is no ventilation nor infiltration.

A report is available, which describes data and results.

Position influence

One is interested in the influence of the building position compared to the cooling energy during July in Carpentras. Rotation of the building is carried out by step of 30 deg, and the cooling energy is calcultated.


The figure gives the cooling energy during July in Carpentras for various building rotation angles.

The strong influence of the orientation is noted.

Weather influence

One is interested in the influence of the weather on heating energy of during February for various French cities.

Weather influence
The figure gives the heating energy during February for 10 French cities. The drawing gives the heating energy in relation to the Heating Degrees-Day at 18 C.

The excellent correlation between these two variables can be noted.

Venetians blinds

One is interested in the influence of venetian blinds (internal blinds mounted on each windows of the building) on the cooling energy during July in Carpentras. The value 0 of the slats angles corresponds to an horizontal inclination.

Influence of the slats angle
The figure gives the cooling energy during July for 10 French cities and for various slats angles.

The strong influence of the slats angles can be noted.

Influence of the blind position
The figure gives the cooling energy during July for 10 French cities and for a slats angles fixed at 45 deg and for various blind positions (internal, integrated or external).

The strong influence of the blind position can be noted.

Night ventilation

One is interested in the influence of the night ventilation on the cooling energy during July in Carpentras. The air is aspired outside, passes from an office to the corridor, then into the stair-wells, and finally is rejected outside. The air flow in an office is 4 vol/h, from midnight to 6 hours in the morning.

Influence of the night ventilation

The table gives the cooling energies during July for 10 French cities without and with night ventilation.

It can be noted that night ventilation makes it possible to reduce the needs for air-conditioning.
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