AIVC - Air Infiltration and Ventilation Centre

Search form

EBC

You are here

Home  |  diffusion

CFD simulation of airflow characteristics of swirling floor diffusers

H.T. Xu, J.L. Niu, 2003
air conditioning | air flow | computational fluid dynamics | diffusion
Bibliographic info: Healthy Buildings 2003 - Proceedings 7th International Conference (7th-11th December 2003) - National University of Singapore - Vol. 2, pp 556-561, 7 Fig., 12 Ref.
Languages: English

Air supply diffusers used in air-conditioning systems can be classified as ceiling diffusers,side-wall diffusers, floor diffusers, jet nozzles and low velocity displacement diffusers. Fixedor adjustable slats are usually used to control airflow directions. Recently, swirling vanes areused in floor diffusers to create a swirling out-flow jet, so that more rapid mixing withambient air can be achieved. In this paper, we use the latest CFD technique to investigate theimpact of these different designs on thermal comfort in the near nozzle region, in view of theincreasing application of floor-level air supply systems. The preliminary simulation resultsindicate that raising air supply temperature from 18 to 22C or reducing the air supplyvelocity from 1.5 to 1.0 m/s can provide better thermal comfort in terms of thermal fielduniformity.The results will be further validated with experiments, and the method is expectedto be used to help optimize diffuser designs.


Related publications

This report summarizes the work of the initial working phase of IEA ECB Annex 62 Ventil
Maria Kolokotroni, Per Heiselberg, Lorenzo Pagliano, Jie Han, Regina Bokel, Peter Holzer, Annamaria Belleri, Denmark
This summary report presents insights on recommendations into how ventilative cooling i
Christoffer Plesner, Flourentzos Flourentzou, Guoqiang Zhang, Hilde Breesch, Per Heiselberg, Michal Pomianowski, Peter Holzer, Maria Kolokotroni, Annamaria Belleri, Denmark
Overheating in buildings is an emerging challenge at the design stage and during operat
Peter Holzer, Theofanis Psomas, Denmark