Building façades control the heat exchange rate between indoor and outdoor environment and, therefore, impact the operational energy for maintaining an ideal indoor temperature. In this study, a double skin concrete façade is proposed with multiple air gaps as thermal insulator. An ultra-thin façade skin is pursued by adopting textile reinforced ultra-high performance concrete (UHPC), while high thermal insulation is achieved by minimizing the convection- and radiation-related heat exchange across the air gaps. This new façade system is being compared to two commonly-adopted concrete façade systems: a solid concrete façade and a sandwiched concrete façade. A façade panel attached to a residential bedroom in Singapore is selected as the functional unit for assessing their carbon footprint, resulting operational energy, and costs. Results show that the new façade system has 34%–44% lower carbon footprint than the other two façade systems. The thermal conductivity of the new façade is 92% lower than the solid concrete façade and 64% lower than the sandwiched concrete façade, which helps reduce the related operational energy by 14%–49% for a typical bedroom unit in Singapore.
Building and Environment, Volume 223, September 2022, 109463,