Thermal resistance of the ventilated air-spaces behind external claddings; theoretical definition and a parametric study

Abstract The presence of a ventilated air cavity between the external cladding and wall core assembly can have varying contribution to thermal performance building envelope. In particular, resistance air-space is dynamic parameter that influenced by various thermo-physical parameters. this study, theoretical definition behind an introduced, employing non-linear network resistances in air-space. A numerical code developed for steady-state condition verified with data from hot box tests available literature. Thereafter, parametric analysis performed based on change rate (0 1000 1/h), type (brick vinyl siding), seasonal variation (summer winter conditions), reflective insulation. results are compared closed see efficiency ventilation confirm function multiple factors, its magnitude varies under different conditions.