Energy Optimization of Double Glazed Window Parameters in Hot and Arid Climate(Case Study: the Southern Front of an Office Building in Tehran)

Approximately 32% of the world's energy is consumed in buildings. Among the various solutions to reduce this consumption, the selection of appropriate types of windows in the shell of buildings can play a vital role in their energy efficiency. With population growth and industry development, preventing energy waste and saving it has become one of the most important concerns of countries around the world. The city of Tehran is one of the most consumed cities in Iran due to its large size and population. Therefore, it is important to pay more attention to the construction method in this city. Among the building envelopes, the south envelope forms at least half of the main walls of the buildings due to continuous sunlight. Because of the continuous solar radiation to the southern envelope, in this study, the effect of different parameters of the double glazed window, such as the type of glass, as well as the filling gas between the double glazed windows with four different air distances has been investigated. Given that a significant part of energy consumption in office buildings is related to lighting, heating, and cooling space, it is important to choose the right type of window in reducing energy consumption. In this research, the findings and their analysis are deductive, which is presented in the form of a diagram. In the simulation of this research, double glazed windows with clear glass and an air gap of 3 mm filled with air have been selected, which is one of the most common and commonly used windows in Tehran. This window on the southern envelope is assumed to be the best and most common envelope for providing light and placing the window in the climate of Iran and Tehran. Then selected efficient components were applied as project variables in the simulation. The simulation model of this research was drawn in SketchUp software and entered into the Energy Plus engine in Open Studio software. Simulation and study of energy consumption of the research model have been done with Open Studio by Energy Plus Engine. Findings show that the use of reflective glass with xenon gas and an air gap of eight millimeters provides maximum energy savings of 14.99% compared to the reference model for the southern front. The results show that the choice of absorbent and low-emission glass is not a great choice for Tehran even in the best conditions, because compared to the reference model, they increase energy consumption by 0.53% and 3.79%, respectively. Therefore, the best window position in the south direction is related to the double glazed window with reflex glass, which has an air gap filled with xenon gas and has a 15% reduction in energy consumption compared to the reference window. This window has the most optimal energy efficiency and offers the use of this window for the city of Tehran. This study suggests the use of this type of window for the city of Tehran, especially office buildings that have a large amount of energy in the world.