Assessment of venturi effect for enhancing natural ventilation in composite climates of India

Abstract

Most of the Indian household and schools are naturally ventilated and dependent on the outdoor air and ceiling fan for achieving thermal comfort. In the composite and hot climate, where temperature reaches to 42 to 45°C, the induced air through windows does not achieve thermal comfort. The velocity of induced air can be enhanced through introduction of venturi tubes. In this study CFD analysis is performed for different geometric parameters of venturi to identify the relation between diameter ratio and enhanced average indoor air velocity. This is concluded that by introducing venturi of diameter ratio (R0= D1(Outer dia)D2(inner dia) of 4, the required indoor air velocity to meet the thermal comfort in composite climate of India in peak summer month is met. Upto 216% increment (from 0.3 m/s to 0.99 m/s) in indoor air velocity is noticed by introducing venturi tubes as compared to normal windows without them.