Analysis of combined low-level indicators for the hot-season performance of roof components

A single performance indicator, the solar transmittance factor (STF), has been proposed in previous works, together with derived index (STI). It is aimed at evaluating summer of roofing system and allowing selection most effective mix surface mass properties. easily calculated from low-level indicators such as U-value, module periodic thermal transmittance, reflectance. In present work, correlation between STF cooling energy demand, integrated over a reference period, was studied, well peak ceiling temperature increase respect to indoor temperature, relevant for comfort. particular, behavior different roof types variable insulation numerically by TRNSYS 17 wide set locations environmental conditions. Unlike other commonly used indicators, which analysis extended, strong found both demand rise.