Analysis of the Strategies for Designing Optimal Transparent Envelopes in High- Rise Office Buildings of Hamadan through Computer Simulation to Reduce Energy Consumption
Mahdi Sharifi

Abstract
The envelope as the outer part of the building plays an important role in providing comfort conditions (in terms of view, acoustics and thermal comfort) for the building users. Appropriate thermal behavior as an important task of the envelope is very significant for energy consumption. The expansion of high-rise buildings in the past decade has led to the widespread use of resources which accordingly the production of carbon monoxide by these buildings is also growing. If the envelopes of high-rise-buildings are properly designed, annual and total energy consumption for heating and cooling will be reduced. In this paper, firstly different kinds of envelopes, their performance and their thermal behaviors have been evaluated through the computer simulation by the use of the Design Builder Software. So that, some kinds of transparent envelope with different specifications, including single-skin and double-skin facades with different thickness and materials have been simulated and it has been recognized that the increase of thickness and the number of layers in a single-skin facades and the increase of distance between two skins in double-skin facades lead to the decrease of energy consumption. The increase of the distance between the layers in a single-skin façade has no effect on energy consumption and among the studied envelopes; the single-skin facades in which two layers have a thickness of 6mmand there is a distance of 6 mm between them, and the double-skin façade with a distance of 100 cm between the two skins have had a better performance. The results of the present research can be used to better understand the behavior of envelopes and more appropriate climatic design in Hamadan.

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