What is the Energetic efficiency of buildings?

By Energy Hamd - December 09, 2021

What is the Energetic efficiency of buildings?
What is the Energetic efficiency of buildings?

 What is the Energetic efficiency of buildings?

    The concept of energy performance refers to the amount of energy consumed each year by a building. It varies according to its structure, more or less energy intensive, but also according to its operation and its energy equipment. The energy performance of buildings is proving to be a major issue in an approach to reducing energy consumption and reducing greenhouse gas emissions.

    From a concrete point of view, energy performance is one of the levers of the energy transition. In addition, this is relatively measurable data, in particular thanks to the introduction of the DPE (Energy Performance Diagnosis).

        1. Definition of the energy performance of buildings

    The energy performance of a building is generally correlated with that of energy efficiency. If the latter refers to the ratio between the energy absorbed by the building and the energy consumed inside it, the energy performance serves as a benchmark for knowing the building's energy expenditure over the year.

    The concept of the energy performance of buildings is commonly used in subjects relating to ecological and energy transition, or in the building and housing sectors. It makes it possible to formulate objectives for reducing energy consumption and therefore improving the energy efficiency of a building. Optimizing energy performance is therefore one of the major challenges of climate change.

    Improving the energy performance of a building comes down to acting on its energy consumption. The objective is to optimize its estimated energy consumption over the year while ensuring a certain level of thermal comfort. This is the reason why the notion of energy performance is linked to that of energy efficiency. The two are interdependent.

        2. How is energy performance calculated?

    The calculation of the energy performance of buildings is based on various criteria, relating both to the quantity of energy produced by a residential stock and to the quality of this energy. The qualitative criteria include heating systems, hot water, related equipment, ventilation and air conditioning systems.

    Quantitative indicators complement these criteria. These are generally figures relating to all the technical characteristics of the building. To calculate its overall energy performance, it is necessary to take into account all the energy installations of the building, from its exposure to the sun to its thermal insulation, including the layout of the accommodation in relation to the climatic context in which it operates.

    It is the compilation of all this data that allows energy professionals to calculate the energy performance of a building. It is this result that leads to the formulation of the DPE (Energy Performance Diagnosis). The DPE in turn makes it possible to visually locate the energy performance of the building via letters and colors. The more energy efficient a dwelling, the closer the letter corresponding to it is to A.

    Calculating the energy performance of buildings makes it possible to take into account existing criteria to build several optimization strategies and anticipate work to improve energy efficiency, and to prepare for the future transition, i.e. towards energy savings objectives. energy, or towards more ambitious energy production objectives. Calculating energy performance is also an essential step in offering you solutions for optimizing your energy performance, if possible without having to plan for renovation work.

        3. What regulations around energy performance?

    Energy performance is also an active indicator within the framework of the new European environmental regulations in force to measure the level of energy consumption of buildings as well as the savings made, in particular during the construction of new housing in the real estate sector.

    The very notion of energy performance is linked to the introduction of thermal regulations, in particular RT 2012, which had the BBC level as a benchmark. In 2020, the regulations plan to change energy performance towards a passive energy building objective, or even positive energy. The law supports the public plan to increasingly encourage the use of renewable energies to encourage energy savings in the tertiary sector.

     To achieve this, thermal regulations define a level of energy performance to be achieved. The number of KWh not to be exceeded depends on the building criteria. This energy limitation concerns the use of heating, air conditioning, hot water, lighting and auxiliary energy equipment such as heating pumps or VMC.

    Although regulations provide a framework for improving the energy performance of companies, the latter is linked to the objectives and requirements of each of them. This involves working on the uses of energy by the occupants. You can also approach a company offering an energy performance consulting service to implement a long-term energy saving strategy.



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