Evaluates selected aspects of window thermal performance modelling via a detailed study of edge-seal thermal performance. Insights into window modelling are sought and discussed with respect to the importance of thermal contact surfaces, the thermal resistance short-circuit nature of high thermal conductivity materials, the sensitivity of model predictions to thermal conductivity uncertainty, structural simplification, independent modelling, gridding, and the role of 2-D effects.

KEYWORDS: comparing, performance, windows, double glazing, calculating, experiment, heat flow, heat loss, window frames, thermal resistance, thermal conductivity, seals, aluminium, glass fibre, corrugated, foams, computer programs, accuracy.

Units: Dual