Feature Report: Housing: Reducing Energy Consumption

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Housing: The User's Crucial Role

Improving a building’s energy efficiency can be achieved both through passive methods that enhance its intrinsic features, particularly at the time of design and construction, and active methods that depend on the user and how they manage their consumption. Passive measures take time, require a holistic approach and can be very expensive. Active measures are less costly (or, indeed, cost-free), and deliver immediate gains. 

Housing: The User's Crucial Role
The user's behavior is key to managing electricity and heat flows in the home. ©THINKSTOCK

Active Methods: Focus on the User

The originality of active measures is that the building's occupant is directly involved.1  This crucial role depends on three core elements:

 

Accepting to live with a degree less of heat indoors in winter can result in energy savings of5% to 10%

Passive Methods: Renovation and Construction Standards

Improving the intrinsic features of the housing stock involves drafting stricter regulations for new construction and upgrading heating systems in existing buildings. In France, such rules are set out in the “RT” thermal regulations, which have been periodically updated since 1974.  

Several main areas are now prioritized: 

  • Situating buildings properly in relation to the sun and careful management of sunlight. In addition to shade screens adaptable to building facades, manufacturers are working on electrochromic glazing that adjusts its tint to the amount of sunshine and the outside temperature. 
  • Managing the combination of aeration and ventilation. Efficient ventilation prevents excess humidity and promotes a healthy living space. This means installing a double-flow controlled mechanical ventilation system that recovers the heat of the stale air extracted from the house and uses it to heat the incoming air from outside. 

 

Ventilating a house is essential for reducing its heating needs. 

  • The third area is thermal insulation, an essential step to take before opting for a more efficient heating system.(2) In new builds, it is important to avoid thermal bridges, which cause heat loss at wall/floor and wall/ceiling junctions. Exterior thermal insulation, i.e., an insulating coat of polystyrenePolystyrene is a plastic with a wide range of uses, the most common being expanded polystyrene... covering critical areas like a second skin, is highly efficient. The insulation is based on the design of more efficient materials with very small pore sizes, which prevent the movement of molecules. Phase-changing materials are also capable of storing heat during daytime by changing from solid to liquid, then releasing the heat in the evening by becoming solid again.

The long-term objective is to ensure that new buildings are energy positive, meaning that they must produce more energy than they consume. The energy may be generated by solar panels, heat pumps, wood-burning stoves, thermodynamic water heaters, etc. 

 

 

Sources:

(1) See ADEME recommendations (in French)

(2) ADEME Guide – Insulating your home (in French)