Factor 9

The expression Facteur 9 returns to the Facteur 4 , which indicates in particular the engagement of France to divide by 4 (i.e. to reduce of 75%) its emissions of Gaz to greenhouse effect from here 2050 pursuant to the Protocole of Kyoto and according to its national plan. The factor 4 , consensuellement retained by the Grenelle of the environment in France in 2007, only made it possible to stabilize the situation, which rather worsened with global scales since the Protocole of Kyoto. Some thus propose now factor 9.

Why “9” ?

One initially spoke about factor 5,6 then 8 (objective technically rather easy to reach in the building).
Le figure 9 rises from analyzes Prospective S including the fact that from here 2100, the Démographie should continue to grow.

- If demographic growth rate is of 1,5,

- if the consumption of the individuals is still multiplied by 3 (many countries known as “poor” want to have access to more services and of consumption.

- If one wants to divide by 2 the gas emissions with greenhouse effect,

Alors, the future reduction of the consumption of energy should at least be of: 1.5 X 3 X 2 = 9

Stakes

The central stake is that of the Sustainable development.
Dans all the cases (factor 4 or 9), it is the sector of the building which should make the most efforts because it is there that the techniques are available and efficient, and the building is in Europe the sector most consuming primary energy (40% of consumed total energy) before transport (30%) and industry (30%), while being responsible of more than 40% of gave total of CO2 (with important regional differences related on the age of construction and the climate)…

It is a strategy “ gain-gaining ” because the investments are refunded by the economies, and increase the “ avoided costs ” future. It is necessary nevertheless to have sufficient initial investment loans.

Example

One built in Canada a house of demonstration consuming only 10% of what a conventional average house of the same size in 1970 consumed, and 50% less water than an average house today, by decreasing its environmental impacts, in a spirit of HQE (see)

Criticisms or forced

The concept applies very with difficulty (or very expensively) to the old building. Its application to the rehabilitation is supported little by the public research (and even less private), even in the countries which are at a peak on the saving energy.

See too

Facteur 4
Maison passivates, solar Maison passivates
HQE

Bonds external

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