1:50 scale modeling study on airflow effectiveness of large spaces mutually connected for underground workshops

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• 作者：Tong Ren ; Angui Li ; Na Luo ; Ying Zhang
• 关键词：ventilation ; hydropower station ; underground powerhouse ; model test ; temperature field
• 刊名：Building Simulation
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：9
• 期：2
• 页码：201-212
• 全文大小：2,896 KB
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• 作者单位：Tong Ren (1)
  Angui Li (1)
  Na Luo (1)
  Ying Zhang (1)
  
  1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, 710055, China
  
• 刊物类别：Engineering
• 刊物主题：Building Construction, HVAC and Refrigeration
  Engineering Thermodynamics and Transport Phenomena
  Atmospheric Protection, Air Quality Control and Air Pollution
  Environmental Computing and Modeling
  Chinese Library of Science
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1996-8744

文摘

In the design of air conditioning and ventilation for an underground workshop, such as hydropower station underground powerhouse, mechanical ventilation was frequently applied to control air quality for large and mutually connected spaces of Dynamo floor, Generatrix floor, Hydraulic floor and Cochlea floor. In this paper, based upon the similarity criterion, the dimensionless yield criterion was used to explore the airflow effectiveness of large spaces mutually connected and a 1:50 small-scale model of the main powerhouse was built which was used to study and analyze the airflow distribution in large spaces mutually connected. A series of parameters was obtained from the experiment, and here we discussed following conditions: three air supply velocities: V/V ₀=0.75, V/V ₀=1 and V/V ₀=1.25 (V ₀ is the designed air velocity in this model) and three heat release rates: Q/Q ₀=0.75, Q/Q ₀=1 and Q/Q ₀=1.25 (Q ₀ is the designed heat load in this model). The environmental parameters of a workspace at different floors were acquired to study the effect of mechanical ventilation on the temperature field under different air velocities and heat release rates. The experimental results show that the heat release rate had a significant effect on the main power house temperature distribution. An appropriate air supply velocity could effectively optimize workplace temperature distribution under high-heat intensity environment. Energy efficiency coefficient and non-uniform temperature coefficient were predicted and the optimal design parameters (0.75V ₀, 1Q ₀) were recommended after 9 kinds of tests were conducted. The experimental research is helpful to the ventilation design of large and mutually connected spaces, such as Dynamo, Generatrix, Hydraulic and Cochlea floors in hydropower station underground powerhouse. Keywords ventilation hydropower station underground powerhouse model test temperature field