Is it better to design buildings low emission” rather than BEPos ?

The Academy of Technology believes that the development of buildings and neighborhoods positive-energy would be less efficient to combat the global warming that to focus on the buildings and territories to the “low emissions” of greenhouse gas emissions. Decryption.
Since the fall of 2016, France undertook before the United Nations and the other signatories of the Paris Agreement on climate change to reduce its greenhouse gas emissions (GHG). Measures to achieve these aims, including the improvement of energy efficiency and alternative energy development, are subordinate to this commitment. The Academy of Technology is concerned, however, that the future environmental regulation of buildings does not take into account this paradigm by continuing to push the development of construction and territories positive energy (BEPos and TEPos), without assessing the cost of a tonne of greenhouse gas avoided. However, in the current experiment, E+C- (for “higher energy, carbon-less”), which prefigures in part the regulation of the future, the aspects of reduction of carbon dioxide emissions are well integrated. Similarly, the label BBCA, for Building Low-Carbon, aims to limit emissions of carbon dioxide throughout its life cycle.
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The Academy states : “to Ensure an annual energy balance sheet of the positive building (or territory) does not provide for limitation of GHG emissions and did not make economic sense. In fact, it can compensate on the year the use of fossil fuels for the production of solar electricity or other renewable, does not guarantee the limitation of GHG emissions, even if there are achievements of BEPos remarkable on the energy plans and economic as well as GHG emissions“. A purely energy would therefore be a non-economic sense, since it would amount to thinking that it is possible to compensate for the times when energy is scarce and expensive by others where it is abundant and inexpensive.


Spend of the BBC in the BBE
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The scientists propose, therefore, to promote the production of heat, rather than electricity, for renewable energies, whether it is storage heaters, hot water tanks, heat networks, solar thermal or heat recovery fatal. The production of heat by an electrical power source should be assigned a coefficient equivalent, at a minimum, to natural gas as soon as this current would have a low content of GHG emissions (less than 100 grams of CO2/kWh). They also recommend that the building be thought of “as an energy system to optimize between use of energy, inputs via the networks and local production based on renewable energy, to minimise GHG emissions“. A recommendation that requires the development of means of storage of electricity and heat, to ensure transitions day/night, but also over longer periods, weekly, and seasonal.


Finally, the Academy intends to introduce the concept of building low emission (BBE), with a base level of kg CO2/m2, as the basis of future regulation. This “to avoid the construction of new buildings, which will be still present at the end of the century, emitting quantities of greenhouse gas emissions significant“. In the same way, it wishes to promote territories low emissions rather than TEPos, a concept which is likely “to push the use of expensive local resources instead of using other less expensive in a neighbouring territory“. The communities are called upon to “participate in the overall effectiveness of the systems in a spirit of national solidarity“. Note, however, that the writing of future regulations is not started yet since it will have to wait for the feedback of E+C – that will guide the choices and define the thresholds to reach in terms of energy consumption and carbon footprint. This experiment will be a walk through between the current RT2012 and the environmental regulations of tomorrow, who will not appear without doubt that, after 2020.

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