2.1.9 Installation of efficient windows (double glazing with aluminium frames with thermal break)
Description
This measure consists in the replacement of inefficient windows (e.g. aluminium frame without thermal brake and single glazing) for an efficient one with double glazing and aluminium frames with thermal brake. A typical transmittance of this type of windows is between U=2.2 W/m2K and U=3.5 W/m2K compared to the transmittance of inefficient windows which typical is higher than 4 W/m2K
Benefits
Airtightness improved
Limited condensation
Sound insulation
Safety
Reduce heat losses
Easy cleaning
The aluminum frame is available in various colors
Aluminum is a strong and rigid material, its properties do not change with the weather and its rigidity is ensured at high and low temperatures
Limitations
The energy consumption for aluminium manufacturing is high.
Double glazing cannot be repaired
During the summer months, trapping heat inside glass panes can lead to a stuffy and uncomfortable room
The most common complaint of this frame is that in winter the aluminum sweat
It is a cooler material than the wood and PVC
Over time, the aluminum can become corroded
Economic assessment
Initial investment: high. It can be estimated an average cost of about 1500€ for each window, but this price vary greatly, depending on the size of the window and manufacturers. Energy costs are reduced.
References and best practices
- Thermal convection in double glazed windows with structured gap:
www.sciencedirect.com/science/article/pii/S0378778811001551 - Low heat loss double-glazed windows:
www.sciencedirect.com/science/article/pii/0360544287900429
CHARACTERIZATION
Environment or playable world:
Residential
Academic
Offices
All
Carried out by:
Public building users
Owners
Operators
All
Reduce consumption of:
Heating
Cooling
DHW
Lighting
Electric devices
Type of driver:
Physical environmental
Contextual
Psychological
Physiological
Social
Time framework:
- Short term
- Long term
Type of measure:
- Envelope
- HVAC
- DHW
- Lighting
- Electrical devices
- Other