المجلة الدولية للعلوم والتقنية

This paper presents a numerical approach to studying the thermal performance of single and double-glazed windows under the climate conditions of the Libyan (Mitiga Airport). A two-dimensional steady-state model, based on fundamental equations of mass, momentum, and energy conservation, was developed and solved by ANSYS Fluent. The window height was assumed to be 1.2m with glass thickness ranging from 6mm to 12mm for the single-glazed window. Similar thicknesses were used for the double-glazed window with internal gap thickness ranging from 7mm to 22mm. The frame is assumed to be made of U-PVC and the gap of the double-glazed window was filled with Air and Argon. The optimum gap spacing was found to be 14mm and 13mm for the Air and the Argon, respectively. The maximum heat transfer reduction for the Argon-filled double-glazed window was about 90.5%, while it was about 86.9% for the Air-filled double-glazed window in comparison with a single-glazed window. This study is part two of a research project aiming to justify the implementation of double-glazed windows and its impact on improving the thermal performance of the building envelope in Libya. Keywords: Single-glazed and Double-glazed window, Argon and Air fillings, Heat saved