Efficient regulated ventilation
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The ELENA regulated ventilation solution (a local energy-saving air replacement solution) consists in adjusting the ventilation of a room according to its occupancy, to achieve the best compromise between inside air quality, energy savings and occupant comfort.
Regulated ventilation for maximum comfort and energy savings
Air replacement is indispensable to maintain the hygienic quality of a room. At present, ventilation systems (meeting rooms, entertainment halls, lecture halls, etc.) run at full power, whether the room is empty or full. However, continuous ventilation is expensive in terms of energy costs: electricity for the ventilators, uselessly heating the new air then rejecting it outside…
In addition, requirements are becoming more and more stringent concerning the comfort and quality of the interior atmosphere. Management of this type of space involves maintaining a permanent balance between thermal comfort, hygienic requirements (providing the legally required flow of new air) and energy consumption.
ELENA, innovation for effective ventilation
Developed by the GDF SUEZ’s R&D team, ELENA (Economies Locales d’Energies pour une Nouvelle Aération) is an integrated solution, which controls climatic comfort at the same time as air quality, taking into account the room’s occupancy rate.
The regulated ventilation principle consists in measuring the rate of CO2 – a reliable indicator of the room’s occupancy rate – and adjusting the proportion of new air and its flow rate accordingly. The system comprises sensors that measure the outside temperature, inside temperature and ventilation delivery rate. This is coupled with the existing air handling system.
ELENA thus makes it possible to maintain air quality by controlling the
Successful deployment
ELENA was patented in 2007 following four years of development via French national programs financed by the ADEME (Agence de l’Environnement et de la Maîtrise de l’Energie). The regulated ventilation system has met with success, particularly with customers such as IBM, CIC and Texas Instrument (office buildings). ELENA has also been installed in the prestigious hemicycle of the Council of Europe.
The site measurements taken revealed greater comfort for occupants: less ventilation noise, fewer drafts, etc.
