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The crucial area of the new regulations is obviously the energy performance requirements, expressed in terms of an E level. The lower the E level, the more energy efficient the building and its installations. As calculation of the E level is rather complicated, architects will do it.
The Flemish Government provides software designed to facilitate calculation of the E level and control materials and techniques to achieve an E level of 100.
Energy performance expresses the behaviour of a building with regard to energy consumption. It is influenced by factors such as reduced conduction and ventilation, extra internal heat, solar input, the efficiency of heating and hot water systems, and the output of any solar energy equipment.
To calculate the energy performance of a building, total energy consumption must be converted into primary energy consumption (oil, natural gas, electricity, etc.). Comparing this figure with a reference value gives the building's E level.
For private homes, the compulsory energy performance will be E100. That roughly equates to an overall insulation value of K45; factors for ventilation, heating and hot water must be added to this value.