Granada, Spain – A team at the University of Granada’s department of architectural construction has developed a retrofitting technique to improve energy efficiency in windows. It involves the injection of PU foam.
The foam was injected in carpentry profiles of existing aluminium windows. Experiments were carried out in social housing. A monitoring campaign was run during the summer, with thermal results taken both before and after the insulation was injected.
They found a favourable indoor thermal balance after the foam had been injected, with an increase of up to 25% or 4°C in the maximum temperature difference recorded between outdoors and indoors.
The team suggest that the technique could provide a cost-effective way to improve the energy efficiency of existing aluminium windows. This could help energy reduction targets to be met.
The work has been published in the journal Energy and Buildings.