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Simulation of New Methods in Ventilation of Underground Station Sand Tunnels

Adibi, Omid | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43488 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, bijan
  7. Abstract:
  8. Due to growth of the number of passengers in subway transportation systemsthe capacity of the metro stations are on the rise.The generated heat loads in subway line shall be increased by thegrowth of the its capacity. As a result, current subway ventilation systems cannot provide comfort conditions for passengers. Nowadays, modern ventilation systems are designedto improve ventilation performance and to create suitable thermal conditions. Among of these, the under platform andover track exhaust systems and use of platform screen doors can be Cited. The aim of this study is three-dimensional simulation of air flow in modern ventilation systems of subway stations. Numerical simulations are in the framework of the Reynolds-Averaged Navier-Stokes equations. In the numerical simulation both aerodynamic and thermodynamic aspects of the problem has been investigated. The performance of the ventilation systems are studied by analyzing the distribution of velocity field, temperature field and energy consumption. Results indicate that, stations which are equipped with OTE and UPE equipment will have higher efficiency. In this kind of ventilation systemscompared to current ventilation systems, velocity and temperature distribution in the station is more uniform. In this mode compared to the current mode, the required fresh air flow and fans power will decline to the 8.5 and 15 percent, respectively. In case of using platform screen doors with OTE and UPE equipment, heat could not be transferred from tunnels to the platforms, so air quality of station shallincrease. In this case, compared to current ventilation modes, for ventilation of the station and its adjacent tunnels22.5 percent fewer air flow and 35.5 percent fewer energy usage is needed
  9. Keywords:
  10. Simulation ; Thermal Load ; Ventilation ; Tunnel Ventilation ; Underground Excavation ; Underground Metro Stations

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