Smart windows passively driven by greenhouse effect

The rational thermal management of buildings is of major importance for the reduction of the overall primary energy consumption. Smart windows are promising systems which could save a significant part of this energy. Here we introduce a double glazing system made with a thermochromic metal-insulator transition material and a glass layer separated by an air gap which is able to switch from its insulating to its conducting phase thanks to the greenhouse effect occuring in the separation gap. We also show that this passive system can reduce the incoming heat flux by 30% in comparison with a traditional double glazing while maintaining the transmittance around 0.35 over 75% of visible spectrum. Published under an exclusive license by AIP Publishing.

Automated summary

The rational thermal management of buildings is crucial in reducing energy consumption. Smart windows offer potential energy savings. This article introduces a double glazing system that can switch between insulating and conducting phases through the greenhouse effect, reducing heat flux while maintaining transmittance.