Ji, Y and Cook, M 2005, Atrium-assisted natural ventilation of multi-storey buildings , in: The 10th International Conference on Indoor Air Quality and Climate, September 4-9, 2005, Beijing, China.

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Abstract

Buoyancy-driven displacement natural ventilation in a simple multi-storey building structure is investigated. The storeys are connected to a common atrium and top-down-chimneys, and the internal heat gains of the storeys are represented by localised point heat sources on each floor. The heat sources generate thermal plumes which entrain the surrounding air and transport warm air upwards. Simple analytical models are used to describe the main flow features, such as interface height, temperature gradient and ventilation flow rate. Atwo-storey building structure is also investigated using computational fluid dynamics (CFD). Using the RNG k-epsilon turbulence model the predicted airflow patterns, temperature profiles and ventilation flow rates agreed favourably with the analytical models. The work demonstrates the potential of using CFD for modelling buoyancy-driven displacement ventilation in complex building structures and the accuracy that can be expected.

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