Tour du Midi: optimized energy performance

The Belgian National Pensions Office (ONP) in Brussels has renewed its confidence in Veolia to manage the energy performance of the Tour du Midi for another ten years. Veolia has managed this building's exemplary energy performance for thirty years. Sarah Scaillet, Head of the ONP looks back on this project. 

"1,700 employees of the National Pensions Office , which handles the pensions of employees and self-employed people in Belgium, work in the Tour du Midi.  We are proud of this tower in Brussels. There are not many in the skyline and it is a true symbol for people living in the city. Our management philosophy for this fifty-year old dame is to think long term with means for the future. 

Tour Midi

The Tour du Midi was built in 1965 and needed renovating. We initiated a long-term strategy with Veolia  in 2008. We began by improving the use, distribution and exchange of energy flows (heating, cooling and electricity) through hydraulic and electric changes and better control. All actions were aimed at integrating new equipment and maintaining optimum performance levels. Among the most important projects, a co-generation unit was installed and old chillers were replaced by machines adapted to the building's behavior. Among these machines, we chose a heat pump to recover heat from the data centre. A free chilling unit was also considered to cool the IT and to store depending on heating or cooling periods. 
An innovative control system was logically implemented to manage all of this new complex equipment.  All production unit performance is monitored in real time via "Hubgrade", which is a smart data collection, use, and management system that helps maintain performance and continuous optimization.  It combines data collection software with a pool of expert analysts for real-time on-site response and long-term scheduling as well as sharing and information systems for customers. These three aspects help make substantial energy savings . Hubgrade is used to monitor the energy flows of another 150 buildings in Belgium. 

Since the entry into service of these facilities in the Tour du Midi, the results have been more than convincing: since 2008 we have used 37% less fuel oil and 29% less electricity which corresponds to a reduction in our CO2 equivalent emissions of 6,017 tons (which is the equivalent of the emissions of 4,233 cars or 1,800 homes)."