Title
Comparison of displacement and mixing diffusers
Author
Jiang, Z.
Chen, Q.
Moser, A.
Technisch Physische Dienst TNO - TH
Publication year
1992
Abstract
In order to compare the performance of different supply diffusers of ventilation air, the airflow pattern, temperature stratification and contaminant dispersion in a furnitured office ventilated by three kinds of air diffuser were numerically investigated. The air diffusers studied in this paper are a quarter-cylinder displacement diffuser on the floor and mixing diffusers (linear and vortex diffusers) on the ceiling. The heat sources in the office are considered to be 50% convective and 50% radiative. The k-e two-equation model of turbulence is employed to predict the turbulent diffusion. The results show that the displacement diffuser provides a rather uniform flow field with low velocity in most areas, and the vertical temperature dfference from floor to ceiling is as high as 6 K. With the linear diffuser, the air velocity is high, and the temperature is uniform both horizontally and vertically. The air velocity generated by the vortex diffuser is moderate. The distributions of the temperature and the contaminant are rather uniform.
Subject
Airflow pattern
Indoor contaminant
Temperature distribution
Numerical simulation
Displacement diffuser
Mixing diffuser
To reference this document use:
http://resolver.tudelft.nl/uuid:f31b2a40-f942-407f-9adb-df81a866eddc
TNO identifier
282251
Publisher
Munksgaard, Copenhagen
Source
Indoor Air, 2, 168-179
Document type
article