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THE ENERGY FUTURE OF EXISTING BUILDINGS IN BRUSSELS: BETWEEN PRESERVATION AND PERFORMANCE
We corrected all of this. We insulated the heating pipes, particularly in the basement as it serves no purpose to heat the boiler installation or the corridors in the cellars. These are low-cost actions that do not involve façade insulation, replacing frames, etc., which are not PLAGE actions. Our actions involve working towards a rationalised use with lower costs. The result for this school was a reduction of 42% consumption in heating over four years which led to a 2% increase in electricity, although this element was not taken into account at all. The financial savings was almost 27,000 euros.
The second example is the “Athenee Robert Catteau” (fig. 6). Built in 1925, this large school has a heated surface area of 14,000 m2. It is a more imposing site than that of Forest, with a multitude of buildings, a big centralised boiler installation and underground pipes, which suggests high energy loss in transporting heat to each of the units. The situation at the beginning of the project was worse than that of the previous example, but the gains were nevertheless substantial after four years as we dropped from 162 euros per pupil/year to 135 euros and from a consumption of 156 kWh/m2/year to 118kWh/m2/year.
We changed the heating timetable. This may seem like pure common sense, but in reality it is not always that easy. When the heating system is centralised one has to ascertain if there are separate circuits for the different parts of the school
Fig . 4
The SISPs involved currently in the PLAGE project account for almost 1,200,000 m2 heated surface area. The priority for intervention is placed on collective heating installations. Although this PLAGE project is not yet finalised - this is planned during 2016 - we can already see major improvements of up to 20% reduction for the most advanced companies (© BE).
Fig. 5
Municipal primary school n°9, rue du Monténégro in Forest. At the start of the PLAGE project, energy costs amounted to 206 euros/pupil/year. At the end of the project this had fallen to 142 euros/pupil/ year (A. de Ville de Goyet, 2015 © SPRB).
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