UNCERTAINTY QUANTIFICATION OF OVERALL HEAT TRANSFER COEFFICIENT(U-VALUE) FOR A GLAZING SYSTEM WITH EXTERNAL VENETIAN BLIND

This study investigates the stochastic characteristics of the U-value of a double-glazing system with an external Venetian blind. The thermal properties of window systems have been treated in a deterministic fashion and physically calculated under static boundary conditions defined by national standards. However, the stochastic variation of the U-value is known to be caused by environmental conditions and blind slat angles. For this purpose, the authors selected two points in time for seasonal comparison, and the U-value was calculated by "pyWinCalc". Latin Hypercube Sampling and Sobol methods were employed for the uncertainty and sensitivity analysis. It is demonstrated that the uncertainty of the U-value according to environmental conditions and the slat angle is significant, and distribution also varies seasonally. Hence, it is suggested that careful attention should be paid to an objective assessment of the thermal performance of such systems and the implementation of dynamic control for external Venetian blinds.