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The in-depth study of EOLIOS made it possible to complete the risk assessment, optimize the design and determine the energy consumption of the data center.
City of Paris
France - Paris
In climatic engineering, air circulation is induced by two driving forces:
– Thermal draught occurs when a difference in temperature causes a difference in density between two air masses. This effect is accentuated by a greater height in the volume. “Hot air tends to rise”.
– The distribution of pressures and depressions induced by the HVAC systems in the volume.
Of lesser importance, the ambient humidity also causes air movement, since humid air is lighter than dry air. Therefore, humid air rises due to its lower density (example of the hydrological cycle), even though its temperature is identical to that of dry air.
The phenomenon of stratification is the consequence of the following physical phenomenon: the density of air depends on its temperature. Specifically, as the temperature of a fluid increases, its density decreases and the fluid rises.
This property allows hot and cold air to be distributed according to height, more pronounced in high volumes and to remain separated in distinct layers (strata: from which the term “stratification” is derived). The layers are separated by the coldest ones at the bottom and progressively go to the warmest air strata above. Generally, the objective is to maintain the warm strata at the level of the extractions in order not to overheat the occupancy zones by the scenic contributions.
This organization into layers of different temperatures is true for a volume in which the inside air is stable, that is to say little stirred and with little recirculation. In our case, there are significant recirculation and induction movements taking into account the installation of a blowing system by long range nozzle resulting in a homogenization of the temperatures.
Indeed, the phenomena of induction and recirculation disturb the hot strata of the upper parts. The high-speed ventilation by the long-range blower causes a significant agitation of the air already present in the volume, so that the ambient temperature is found almost uniform throughout the volume. The air in the volume is strongly stirred , animated by friction, the effects of depressions and turbulence induced by the low long ranges which set the air masses in motion.
In the end, the joint studies with Sphère Ingénierie made it possible to carry out a complete technical assessment and the provisional details of the work to be carried out.
The arena’s thermo aeraulic simulation provides information on airflow, circulation, air quality, heat flows, pressure flows, temperatures and humidity levels. The studies of EOLIOS and SPHERE Ingénierie allowed to dimension precisely the needs of cold production and air distribution within the framework of the renovation of the installations of climatic engineering of the Accord Hôtel Aréna.
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