Effect of air movement in building

A number of studies have examined the potential of using natural ventilation as a passive cooling system and comfort under warm conditions. Tanabe and Karma (1994) conducted an experimental work at 50% RH under different level of air speed. They found preferred speed at 28C to be 1.0 m/s, at 29.6 C, 1.2 m/s and at 31.3C, 1.6 m/s. Although traditional architecture of Iran has a very good background in terms of passive building design strategies for achieving comfort condition, however, they are mostly ignored and people are concerned with the rising costs of electricity and fuel. In their buildings air conditioning is used during hot hours of the days. During the cooler hours, most people are still willing to open their windows and let fresh air in. The problems with current designs have prompted designers to rethink their designs, particularly because of an increasing awareness of sustainability. To conserve energy and reduce Co2 emissions. It is important to design energy efficient buildings. This study addresses the effectiveness of air movement on human comfort and the effectiveness of natural ventilation in building design and energy saving.