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Evaluation and Simulation of Tunnel Mid-shaft Effects on the Natural and Normal Ventilation Performance in a Subway Tunnel

Mahmoodi, Ghasem | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43936 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan
  7. Abstract:
  8. Necessity of a public transport network, environmental protection and a highly land cost in urban areas have increased the desire for underground transportation systems. On the other hand, ventilation system design should be done precisely specially for longer tunnels, large undergrounds spaces and crowded places. Rate of energy reduction for vent systems operation is dependent on their proper implementation. Tunnel design efficiently is influenced by ventilation system. The tunnel mid shaft is complementary part of the underground railway systems that is required for exchange air between the tunnel and the railway station with ambient fresh air. An important application of the tunnel mid shaft is for natural ventilation system where unfavorable airflow produced by trains may be aspirated by passengers. Another significant application of the mid tunnel vent shaft is removal of polluted air within the tunnel. Because of these applications, the efficiency of natural ventilation is dependent directly to the volume of air emitted through vent shaft to the outside. At the first part of this study, operation of tunnel mid shaft is analyzed including aspects of the geometry and position of the shaft using three-dimensional simulation software Fluent and employing the dynamic layering method for moving train’s boundaries. At the second part, evaluations for efficiency and advantages of the shaft in long tunnels carried out in a subway system with different length of tunnel employing normal conditions using the one-dimensional software simulation for ventilation system design of underground tunnels, SES (Subway Environmental Simulation)
  9. Keywords:
  10. Simulation ; Train Piston Effect ; Ventilation Performance ; Natural Ventilation ; Tunnel Mid Shaft

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