“Clovers” school – Anderlecht

© Pictures taken by ARTER


Building of a school planned for 750 students and a PE hall meeting the passive standard. 

This project is the 2012 BATEX contest winner and aims to be exemplary as far as energy and sustainable development are concerned, but also meets the will to involve the children in energy management by early teaching of good reflexes in energy control.


Engineering office’s assignments:

Energy concept/ sustainability

As each parameter affects energy performance, optimization of technical solutions was made in line with the project owner program and the architectural project.

This optimization enabled us to achieve an overall very efficient energetic standard meeting the passive construction criteria.

Primary energy need: 58 kwh/m2/year

Net heating need: 11 kwh/m2/year

The sustainability concept is expressed through many parameters, from saved grey energy to the strengthened use of sustainable materials requiring little maintenance, intensification of green roofs, rainwater use and management a.s.o…

The performed studies are the renewable energy prefeasibility study, energy feasibility study, passive building certification study, dynamic simulation with help from TRNSYS software, lighting study with ECOTEC software, EPB study, the special techniques study, recovery, and management of water.


Ventilation: decoupling of ventilation and heating to ensure an appropriate heating comfort in every room and space regardless of occupation variations and without interferences between spaces.

Solar gains: use of glass with a high solar factor, concrete precast for a high thermal inertia, projecting caps allowing shade to the large windows by sunshine, but allowing the low winter sunrays.

Cooling needs: overheating passive control strategy was implemented in the project to ensure heating comfort with no need for specific cooling.

Lighting needs: optimization of natural light; the ratio in daylight is 5 % higher in the classrooms, the daylight autonomy in the classrooms is 80 %, solar blinds, high efficiency lighting and electronic ballast in the whole project, artificial lighting brightness management based on natural lighting sensors, management of the lighting in the sport hall for light training and competition brightness level; light performance less than 2 w/m2/ 100 lux for classrooms and cafeteria. Lighting performance in the entrance hall and corridor is less than 3.6 W/m2/100 lux, which can be explained by natural lighting requiring very little artificial lighting. In the sport hall the lighting performance is under 1.5 W/m2/100 lux.

Needs in domestic hot water: hot water for the kitchen is produced by a condensing gas boiler. In the sport hall, it is produced by the central main boiler and a gas cogeneration.

Building management: electronic control DDC for every heating and ventilation installation. Cogeneration is also incorporated into this regulation as to function as a priority to the use of boilers.

Sustainability of the construction: use of durable materials, requiring little maintenance, classrooms designed in a modular way, which can be modified according to the needs.



State Administration of Anderlecht




CFE Brabant


14,388,088 €

End of works: 2016


9,100 m²

pirnay engineering mentions légales