In this project, the goal was to develop a zero primary energy
building, i.e. a building producing, on a sustainable basis, at least as
much primary energy as it consumed. This ambitious goal (although already
achieved abroad) was undertaken by :
1) achieving the passive standard (heating energy needs of less than 15kWh/m2/year), particularly through the very compact nature of the building, optimal insulation of the walls and an in-depth study of the position and dimensions of the windows. The overall level of insulation, calculated according to the Belgian standard NBN B62 001, is K14 for the building located on Rue Bernaerts and K13 for the building on Chaussée d'Alsemberg (current official standard: K45)
It is important to note that the thermal insulation of the building provides sound insulation against external noise, which is also largely above average.
2) reducing electric energy needs at source (economic lighting, energy-saving household appliances, washing machines connected to the hot water supply, etc.); the lifts have also been chosen on the basis of their energy performance.
3) obtaining with the aid of a biomass micro-co-generator the energy needed to provide supplementary heating or bathroom hot water as well as electricity.
4) completing the project with the installation of solar photovoltaic panels enabling the primary electricity consumption of the building to be offset. Every apartment will have its own photovoltaic installation.
The production of electricity via co-generation will be to the order of 22,000 kWh/year, and via the solar photovoltaic panels 18,000 kWh/year. The domestic hot water needs and additional heating will be supplied by the co-generation and a supplementary gas boiler.
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The eco-construction aspect has been handled at a later stage
and the envisaged materials in general well placed in the NIBE methodology
(standardized classification, according to their energy consumption, effect
on the environment, health, recycling, etc.).
All material has been chosen according to its technical and ecological efficiency.
In particular :
The accessible roofs, that is 150m2, (the others have solar
photovoltaic panels) will be green.
A 10,000 litre rain water tank will be installed and the water collected will be used for watering the outside plants and for cleaning shared spaces. Water saving "at source" has also been studied in relation to the apartments' fittings :
The building will contribute to the ambient biodiversity with
its green facades and green roofs.
The green facades will be constructed using a steel frame and climbing plants and so will not threaten the surface of the facade.
Green Immo - 112 rue Konkel - 1200 Bruxelles Belgique - firstname.lastname@example.org