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THE ENERGY FUTURE OF EXISTING BUILDINGS IN BRUSSELS: BETWEEN PRESERVATION AND PERFORMANCE
proportion of Losses occur through the façades (fig. 3, 4 and 5).
Before measures are taken, the building's current energy use is always examined first. This is true of all cases, whether the building in question is listed or not. Based on the invoices examined, there was a factor of 3.4 to 3.8 between the actual value and normal consumption figures for this type of building. A large discrepancy was thus immediately evident. A large difference between theoretical and actual levels, for example with a factor of 3.5 to 4 above, means that the theoretical values are not actually realistic. For this reason we delved into the literature in order to find a more realistic figure and ended up with a factor of approximately 2.5 with regard to the actual consumption measured in these two houses. The consumption based on the gas invoice was low, though electric heating may be used by the residents for additional heating, which cannot be measured. This is probably the reason for the large difference (fig. 6).
Fig. 4
Ibissenstraat 5: division of losses through transmission per type of wall (© Cenergie).
Fig. 5
Kruisbooglaan 34: division of losses through transmission per type of wall (© Cenergie).
Fig. 6
Final energy consumption of the two houses (© Cenergie).
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