Keramatollah Akbari.indd

More than 90 percent of people in developed countries do live and work in closed and confined places; offices and residential buildings. This is why in this new world more fresh air which is generally provided by forced ventilation plays a vital role in living of human being. Furthermore due to exiting of different indoor pollutants, like radon and a lot of artificial pollutants, the amount of needed outdoor fresh air and in turn the energy consumption has been increased. Nowadays energy consumptions related to ventilation even has reached up to about 30-50 percent of energy used of building sector's share. So making interaction between indoor air quality (IAQ) and optimization of energy saving is a necessary research study. Radon as a natural pollutant is occurred in environment and in many countries threatens people health whereas radon risk is known as the second causes of lung cancer. For reducing radon concentration in residential building at the standard level, forced ventilation is used usually. The aim of this thesis is to study the impact of ventilation on indoor radon by using Computational Fluid Dynamics (CFD) to achieve indoor air quality and energy efficiency. Application of CFD as a new technology, because of its cost and time savings, and on the other side, of its flexibility is increasingly grown and can be used as a very important and valuable tool for the prediction and calculation of air and radon distribution in a ventilated room. Currently, measurement techniques and standards and regulations of indoor pollutants and ventilation, particularly related to indoor radon cannot be able to provide a secure, safe and energy efficient indoor climate. This is why the indoor airflow distribution is very complex and with changing building geometry and operation condition, the treatment of air flow pattern, substantially will be changed, whereas the rules are usually independent of the buildings features. Furthermore, the indoor standards and regulations are based on average amount of pollutants in a room, whereas the pollutant distributions aren't identical and are varied throughout the room. Then the current techniques aren't exactly valuable and acceptable. From different methods which are prevalent to control pollutants, ventilation method is applicable in existing buildings. Designing effective ventilation can reduce radon concentration to very level low with regarding energy conservation remarks. This thesis presents results from experimental and simulation studies on ventilation and radon mitigation in residential buildings, in view points of …