Effects of supply air temperature and inlet location on particle dispersion in displacement ventilation rooms--颗粒学报PARTICUOLOGY

Kang, Y., Wang, Y., & Zhong, K. (2011). Effects of supply air temperature and inlet location on particle dispersion in displacement ventilation rooms. Particuology, 9(6), 619–625. https://doi.org/10.1016/j.partic.2010.05.018

Effects of supply air temperature and inlet location on particle dispersion in displacement ventilation rooms

Yanming Kang, Youjun Wang, Ke Zhong^*

School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

10.1016/j.partic.2010.05.018

Volume 9, Issue 6, December 2011, Pages 619-625

Received 11 August 2009, Revised 4 February 2010, Accepted 24 May 2010, Available online 31 May 2011.

E-mail: zhongkeyx@dhu.edu.cn

Highlights

Abstract

The effects of supply temperature and vertical location of inlet air on particle dispersion in a displacement ventilated (DV) room were numerically modeled with validation by experimental data from the literature. The results indicate that the temperature and vertical location of inlet supply air did not greatly affect the air distribution in the upper parts of a DV room, but could significantly influence the airflow pattern in the lower parts of the room, thus affecting the indoor air quality with contaminant sources located at the lower level, such as particles from working activities in an office. The numerical results also show that the inlet location would slightly influence the relative ventilation efficiency for the same air supply volume, but particle concentration in the breathing zone would be slightly lower with a low horizontal wall slot than a rectangular diffuser. Comparison of the results for two different supply temperatures in a DV room shows that, although lower supply temperature means less incoming air volume, since the indoor flow is mainly driven by buoyancy, lower supply temperature air could more efficiently remove passive sources (such as particles released from work activities in an office). However, in the breathing zone it gives higher concentration as compared to higher supply air temperature. To obtain good indoor air quality, low supply air temperature should be avoided because concentration in the breathing zone has a stronger and more direct impact on human health.

Graphical abstract

Keywords

Displacement ventilation; Particle dispersion; Numerical simulation; Supply air temperature; Inlet location

文章导读