Hadi Zohouri Khosrowshahi - Lecturer, Department of Architecture, Islamic Azad University,Zanjan Branch, Zanjan, Iran
Mohammad Bager Zohouri Khosrowshahi - Master of Civil Engineering, Department of Civil,Islamic Azad University, Shabestar Branch

In the time when the world is debating on climate change issues which is basically due to use of fossil fuel, the use of solar energy in various form is relevant. The existing buildings are responsible for use of large amount of energy for lighting, heating, cooling and use of various energy run equipments mostly powered by fossil energy. Today’s intention should be to replace this fossil fuel by solar energy which is free and available in abundance. In recent times, the world has fortunately become increasingly cognisant of the significant potential of solar energy as a replacement for non‐renewable fossil fuel energy. The sun is a clean, unlimited and almost infinite energy source, providing each hour on earth as much energy as the whole world needs in a year. Proven technologies are able to transform its radiation into heat, electricity and even cold, and are now largely available at affordable prices.