Performance analysis of free flow fans

Abstract

In Sri Lanka air circulating fans are extensively used to improve the comfort level in enclosed spaces. The flow generated by such a fan not only provides the required circulation and velocity but also maintains steady and uniform temperature conditions through better mixing. Among these fans, the most extensively used category is the ceiling fans. There is a wide variety of ceiling fans available locally with different levels of performance. Due to a lack of criterion to identify the most suitable fans for various applications, customers have to face unnecessary inconveniences. To address this issue, it has been proposed to introduce an energy labelling criterion for ceiling fans by Energy Conservation Fund (ECF) & Sri Lanka Standards Institution (SLSI). Development of such a criterion needs detailed performance testing of ceiling fans, particularly the flow field generated.