Experimental study on airflow characteristics of adaptive attachment ventilation with deflectors

Abstract

Mechanical ventilation serves as an effective way to regulate the indoor microclimate due to its high ventilation efficiency and strong controllability. In certain scenarios, the spatial configuration of work areas needs to be adjusted to accommodate the requirements of production processes or personnel activities, posing challenges to the design of indoor mechanical ventilation systems. A novel mechanical ventilation mode, the adaptive attachment ventilation with deflectors (AAVD) mode, was proposed in this study. The theoretical model for the air supply mode was developed, and the flow path can be divided into five zones (Coanda effect zone, vertical wall-attached zone, jet impinging zone, free diffusion zone, and horizontal floor-attached zone). Experiments were performed to explore the ventilation mode, focusing on the airflow patterns and characteristics. Semi-empirical equations were derived for the maximum jet velocity decay, non-dimensional velocity profiles and jet spreading rate, providing essential support for the application of the novel ventilation mode. The findings indicate that the proposed ventilation mode effectively delivers fresh air directly to the target area. This approach not only enhances indoor ventilation efficiency but also contributes to energy savings. The current study advances the ventilation design for scenarios requiring variable workspace.