FAQ

Primary Energy

A primary energy source is a form of energy available in nature before any transformation (wood, coal, natural gas, oil, wind, solar, hydro, geothermal ...). These energy sources must undergo a series of transformations and be transported to be delivered as "final energy" for consumers.

The energy cost of these transformations is taken into account so that for example:

It is considered by the benchmark Passive House that 1kW of electricity coming from the public network corresponds to the consumption of 2.7 kW of primary energy. The benchmark of the Low-energy house label (BBC Label) retains a little lower energy cost of about 2.57 kW.

Frequently asked questions

• Passive House (Passivhaus)
• Low-energy House (BBC Effinergie)
• Bioclimatic Architecture & Buildings
• High energy performance labels in France
• Regulatory framework: thermal regulations (RT 2005)
• HPE label (2005)
• HPE EnR label (2005)
• THPE label (2005)
• THPE EnR label (2005)
• BBC - BBC Effinergie ® label
• Energy-plus Building (BEPOS)
• HQE® approach
• Ecolabels
• Constructive methods
• Outside Insulation
• Thermal bridges
• Inertia of the building
• Airtightness
• Wood manufacture & timber frame construction
• Clay blocks for monolithic walls & autoclave cellular Concrete (ACC), or autoclaved aerated concrete (AAC)
• Window performance
• Green Insulation (cellulose wadding, hemp, wool & wood fibers, straw...)
• Ventilation of the building
• Energy Recovery ventilation (EVR)
• Ground-coupled heat exchanger
• Natural Ventilation
• Windcatcher
• Renewable Energy
• Photovoltaic system
• Solar thermal energy
• Geothermal energy and heat pumps
• Biomass-wood heating
• Wind turbine
• Hydroelectricity
• Primary Energy
• Energy performance certificate (DPE)
• Carbon assessment (Bilan Carbone®)