ON THE HEAT TRANSFER AND LINEAR THERMAL TRANSMITTANCE ACROSS WINDOW FRAMES AND BUILDING WALLS BY MEANS OF NUMERICAL ANALYSIS

Abstract

In the conventional calculation methods for window thermal performance, interaction between window and building wall is neglected. Namely, the boundary between window frame and building wall is assumed to be adiabatic. In this report, two-dimensional heat transfer calculations between window frame and building wall were performed. The ranges of linear thermal transmittance for various window types and frame materials caused by the interaction were summarized based on the calculations.