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The amount of energy expenditure in buildings is 30–40% of the total energy consumption in the world and this share will increase to 50% by 2050. Therefore, reducing energy consumption is a necessity and one of the ways to reduce energy expenditure in buildings is to use passive methods. The use of DSF is expanding as a new approach for building facades due to its ability to prevent excessive heat by absorbing solar radiation. For this purpose, the energy performance of PCM and DSF was studied in three climates of Tehran, Tabriz, and Kish Island, to reveal their energy saving potential. Based on the results of this article, the use of PCM in different layers of DFS can result in a considerable energy saving in Iran residential sector. PCM is integrated both in the external wall and in the partition wall of the DoubleSkin Façade under three different climates. DesignBuilder is used for the thermal analysis of the building. The effects of melting temperature, location of PCM layer in the wall have been investigated. The results showed that we will witness the highest total energy savings percentage in the cold semi-arid climate because of using Infinite RPCM23 in October, amounting to 91.6%. In addition, by using Infinite RPCM25 in warm semi-arid climates in the highest percentage of heating load savings is 99.9% in December and January, and the highest percentage of cooling load savings in cold semi-arid climates is 67.5% by using InfiniteRPCM23 in September. [ABSTRACT FROM AUTHOR]

In order to attain an efficient path into the enhancement of the sustainable conservation and management of energy resources in the buildings and residential sections, efforts by all relevant institutions in the area of energy are essential and primitive. Hence, the development of the energy supply model in the building and the provision of fundamental solutions in this area is rudimentary. The key to any program related to this matter is to boost and extend energy efficiency and energy resource management. According to the global statistics and processed data, the residential sector accounts for 34 percent of the total energy consumption in Iran, which is the highest energy consumption compared to all existing sectors; therefore, immeasurable research has been done on optimizing energy usage in the building sector. One of the most efficient energy optimization methods can be achieved by using energy storage materials in the outer walls of the buildings. In this project, a research‐based residential building is considered as a case to investigate for energy optimization. In the first stage, the building is simulated and the energy consumption of the building is measured. Afterward, with actual measurements, real consumption is approximated and compared with the results of the software. After verifying the software data, the insulation is simulated in the software and the outcomes of using this insulator are investigated to reduce energy consumption. Energy storage materials are considered as a type of phase‐change material. These materials have the same characteristics which is having a different melting point and, by capturing and losing heat at design temperatures, they can help maintain energy inside the building that is how they can be considered as an insulator. Within the appropriate software which is Design‐Builder, miscellaneous types of these materials are available with various features. The final results point out that the use of this material saves up to 30% of the heating energy and about 8% in the cooling load of the building. [ABSTRACT FROM AUTHOR]