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Hassan Hachem: Towards self sufficient buildings

More and more reports show that the carbon footprint and overall footprint of self-sufficient buildings is not as idyllic as expected. Intermediate balance of this energy revolution programmed by the high authorities of the States.

By 2020, all new French construction will have to produce more energy than it consumes. This has been decided by people who know their subject (or in any case, by people who think they know).

In practice, when you know how energy diagnoses of new or old homes are made, it is possible to be dubitative. Promoters obtain certifications that, at best, acknowledge basic procedural skills and at worst, less than that. In practice, no one really controls the actual energy consumption of new homes, for example, which are often far from reality, because, on the one hand, they come from very theoretical calculations, and on the other hand, the certifiers are not controlled. Thus, we found this example of a Parisian couple who built a new country house, in the Perche, supposed to consume 1200 euros of electricity being inhabited by 4 people all year round. In reality, it consumes more than 1500 euros per year only being heated to 7 ° C (frost position) 300 days per year and welcoming occupants during some weekends and during holidays.

Dozens of self-sustaining building projects have sprung up all over the world, in Europe and the United States as well as in Asia and the Middle East. If the promises of all these buildings are similar (close to zero impact on the environment), the rigor of the calculations rarely allows to demonstrate this objective, just as in the case of country house, in theory energy saving, but in practice very greedy.

Does this mean that there is nothing to expect from the new generations of buildings?

No, but with hindsight, we have to come to think that the paradigm has to be redefined. For Hassan Hachem, a construction specialist in Africa and Lebanon, the self-sufficiency of buildings is an illusion in many countries for two reasons: the climatic conditions (the cold peaks in some northern countries, the heat spikes in summer in the Mediterranean area, in Africa, sub-Saharan Africa, the Middle East or Asia) do not allow the goal of self-sufficiency to be fully achieved (in winter because the building will not be able to produce enough energy for heating, in summer because the building will not reach hot countries to produce enough energy for air conditioning, in particular regarding global warming changes).

On the other hand, in some countries with a more temperate climate like France, Hassan Hachem emphasizes, one can imagine building buildings with slightly negative energy, that is, consuming a little more energy than they produce. In countries with larger temperature differences, peaks of heat and the peaks of cold will necessarily have to be managed by means of conventional energy (gas, diesel ...), even if in normal period, significant efforts in insulation coupled with the energy produced by renewable energies will help to strike a balance between energy consumption and energy production.

 

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