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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 6    June 2015

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Heat and hazardous contaminant transports in ventilated high-rise industrial halls
WANG Feng-feng(王沨枫)1, 2, LIU Zhi-qiang(刘志强)1, Christoph van Treeck2, WANG Han-qing(王汉青)1, 3, TANG Wen-wu(唐文武)1, 3, KOU Guang-xiao(寇广孝)1, 3

1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
2. Faculty of Civil Engineering, RWTH Aachen University, Aachen 52074, Germany;
3. School of Civil Engineering, Hunan University of Technology, Zhuzhou 412008, China

Abstract:Performances and efficiencies of displacement ventilation (DV) and partial ventilation (PV) for industrial halls of different configurations as well as the heat and mass transports within the industrial halls were numerically investigated. Three levels of Rayleigh number (5.8′1010, 1.0′1012 and 2.1′1012) and two values of source contaminant flux (5 mg/s and 50 mg/s) were considered. The inlet Reynolds numbers were 2′104, 5′104, 1.5′105 and 4.5′105 for DV and 5′105, 1′106, 2′106 and 4′106 for PV, respectively. From the results, it is concluded that the above parameters have very complex impacts on the conjugated heat and mass transports. From points of view of acceptable indoor air quality and ventilation efficiency, PV at Re=1′106 with side-located sources and 65% of the supply air extracted through floor level outlets is the best choice when Ra=5.8′1010. However, DVs at Re=5′104 and Re=1.5′105 with center-located sources and floor-mounted air suppliers are the best choices for Ra=1.0′1012 and Ra=2.1′1012, respectively. When source contaminant flux reaches 50 mg/s, local extraction as a supplement of general ventilation is recommended. The results can be a first approximation to 3D numerical investigation and preliminary ventilation system design guidelines for high-rise industrial halls.

 

Key words: large space; general ventilation; highly turbulent flows; combined heat and mass transports

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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