Study on the Air Flow Characteristics of the Ceiling Air Diffuser with Computational Fluid Dynamics (CFD)

Low, Jin Ken (2019) Study on the Air Flow Characteristics of the Ceiling Air Diffuser with Computational Fluid Dynamics (CFD). Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

This project was aimed to investigate the air flow characteristics and temperature distribution of various square ceiling air diffusers installed at an outlet positions in a room utilizing a CFD software package, i.e., ANSYS FLUENT. The results of proposed 5 and 7-blade air diffusers were compared with that of commercial 4-blade air diffuser by varying several factors such as diffuser blade types, blade angles (40-Degree, 60-Degree, 70-Degree) and lip angles (0-Degree, 10-Degree, 20-Degree) to determine their improvement on the uniformity of air and temperature distribution at the air diffuser. The standard k–ε turbulent model was adopted in the three-dimensional simulation analysis to investigate the turbulent air flow characteristics. It was found that the proposed 5-blade air diffusers with 60-degree blade angles could exhibit more uniform air flow behavior and temperature distribution within the room, while the 7-blade diffuser with blade angle 60 degrees provided relatively more consistent air flow and temperature distribution than other models in this project. Additionally, increasing the diffuser lip angle to 20° allows air patterns relatively to leave the room ceiling, and reach thermal comfort conditions without draft faster than the 0° lip angle.