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Abstract-One of the most important methods of saving energy in a building is by carefully designing its facade. A 'double skin facade' is optimally one of the best options in managing the interaction between the outdoors and the internal spaces. It also provides some architectural flexibility to the design. Double skin faç ade (DSF) building is one of the available energy conservation opportunities through recent intelligent buildings. The need to energy conservation and sustainable development in buildings is causing a new interest towards passive solar systems. This paper will survey the various types of double skin facades systems, exploring their features and functioning followed by a review of examples; both constructed and proposed, from different buildings. The paper will then assess and analyze recent research and examples to attempt to reach a conclusion as to whether with a double skin faç ade, minimizing energy consumption within building.Finally, double skin facade (DSF) has been proven to be highly useful and significant in current building developments. The only downside of double skin facade is that it is said to be more expensive than the traditional single glass facade. However, it is widely agreed by many experts that double skin facade (DSF) is more cost-effective in the long run. This is because it is long lasting and more durable as compared to the single glass facade Index Terms-Double skin faç ade, energy saving, ventilated faç ade.

Schools constitute the most suitable sector of building for the application of indoor thermal comfort quality as they represent a broad sector of construction. Thermal comfort plays a major role in the educational building sector, especially in hot-arid climate. It has a big impact on building interior temperature as well as on energy consumption. The present study is primarily an attempt to assess the existing indoor thermal comfort status as well as energy consumption in Egyptian public primary school building. To meet this objective, a methodological procedure has been followed; a field study was conducted in a school building that are designed based on natural ventilation and air movement through ceiling fans to assess the indoor thermal conditions based on adaptive standard comfort (ASC) model. In addition, electrical utility bills have been collected. Then, a dynamic building energy simulation model was carried out by using, DesignBuilder software for examining indoor comfort conditions as well as the energy consumption of a typical school building in Egypt. Findings revealed that lighting sources represent the largest proportion of energy consumption. In terms of indoor thermal comfort, results indicate that a higher level of thermal discomfort within the primary public school classrooms and the pupils stay more than 36.5% of their time daily in classrooms with thermal stress conditions.

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