High Energy-Efficient Windows with Silica Aerogel for Building Refurbishment: Experimental Characterization and Preliminary Simulations in Different Climate Conditions

Buildings

Elisa Moretti¹  Cinzia Buratti¹  Michele Zinzi² 

[1] Department of Engineering, University of Perugia, Via G. Duranti 67, 06125 Perugia, Italy;ENEA Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy;

关键词: high energy-efficient windows;    nanogel windows;    silica aerogel;    building refurbishment;    Nearly Zero Energy Buildings (NZEBs);    energy saving in buildings;   

DOI  :  10.3390/buildings7010008

来源: DOAJ

【 摘 要 】

The paper deals with the potential of high energy-efficient windows with granular silica aerogel for energy saving in building refurbishment. Different glazing systems were investigated considering two kinds of granular silica aerogel and different glass layers. Thermal transmittance and optical properties of the samples were measured and used in building simulations. The aerogel impact on heat transfer is remarkable, allowing a thermal transmittance of 1.0–1.1 W/(m2·K) with granular aerogel in interspace only 15 mm in thickness. A 63% reduction in U-value was achieved when compared to the corresponding conventional windows, together with a significant reduction (30%) in light transmittance. When assembled with a low-e glass, the U-value reduction was lower (31%), but a moderate reduction in light transmittance (about 10%) was observed for larger granules. Energy simulations for a case study in different climate conditions (hot, moderate, and cold) showed a reduction in energy demand both for heating and cooling for silica aerogel glazing systems, when compared to the conventional ones. The new glazings are a suitable solution for building refurbishment, thanks to low U-values and total solar transmittance, also in warm climate conditions.

【 授权许可】

Unknown