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Investigation of Plans Shape and Glazing Percentage for the Energy Efficiency of Residential Buildings

Tayyebeh Yazarlou*, Mohammad Djavad Saghafi
School of Architecture, College of Fine Arts, University of Tehran, Tehran, Iran
* Corresponding Author: Tayyebeh Yazarlou. Email:

Energy Engineering 2021, 118(6), 1783-1797.

Received 28 April 2021; Accepted 24 July 2021; Issue published 10 September 2021


The room's plan shape, the area of the window, and the impact of the materials are significant parameters in determining the thermal needs of buildings. In traditional houses of the hot and dry climate of Iran, the plan shape of the room, the ratio of the window area to the floor area, and the comparison between traditional and prevalent materials have been less studied. This study investigated the thermal performance of seven different models of the plan shape, five different ratios of window area to plan area, and three material structures in a selected room of Yazd City using EnergyPlus software. Seven models have different plan shapes but the same floor area, whose thermal balance process calculations have been performed by the CTF method. The results show that the best thermal comfort conditions for the residents are at the window area to floor area ratio of 12% for the brick buildings and 15% for the buildings with thermal insulation and proposed materials. The lowest cooling and heating needs are obtained in a room with an east-west extension and a length-to-width ratio of about 1.38, which indicates the proper plan shape of the selected room. This research can be considered as a climatic strategy to improve the energy efficiency of residential buildings in Yazd.


Energy efficiency; thermal comfort; plan shape; window area to plan area

Cite This Article

Yazarlou, T., Saghafi, M. D. (2021). Investigation of Plans Shape and Glazing Percentage for the Energy Efficiency of Residential Buildings. Energy Engineering, 118(6), 1783–1797.

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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