Square ventilation air duct modelling and validation and the effect of angle change using variable air flow

Che Ibrahim, Noraiman Naim (2023) Square ventilation air duct modelling and validation and the effect of angle change using variable air flow. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Due to the high degree of design and installation flexibility, ventilation ducts are extensively utilized. However, excessive use may increase pressure drop and increase energy use. This study used experimental measurements to analyze the pressure drop in ventilation ducts with bending angles. This study began by measuring the pressure drop in 90 degree with different compression ratios and airflow rates. The pressure for 90 degree ducts was adversely related to the compression ratio. Next, the pressure drops in single-bend ducts with bending angles ranging from 45°, 65° and 90° at airflow speeds were measured. For single-bend duct works, the predicted loss coefficient of the bend increased with bending angle. This study's findings can be used to quantify the total pressure loss in building ventilation ducting systems.

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