THE IMPACT OF WALL HEATING ON LONGITUDINAL VENTILATION

When a downgrade tunnel is ventilated longitudinally, the increase of air temperature due to a fire has two main negative consequences: a loss of efficiency of the jet-fans and adverse buoyancy effects. To estimate air velocity, bulk air temperature therefore has to be computed precisely. In this paper, a simplified model is first described, showing the importance of taking into account wall heating. The code Camatt, which incorporates a finite volume formulation of the heat equation in the walls of tunnels, is then used. It shows that such a computer program should be used systematically when designing a ventilation system for a tunnel, at least as a verification, but preferably as early as the first definition calculations. (A)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/1463242X
• Corporate Authors:

  ITC LTD

  PO BOX 452
  KEMPSTON, BEDFORD,   United Kingdom  MK43 9PL
• Authors:
  • CARLOTTI, P
  • VOELTZEL, A
• Publication Date: 2004

Language

• English

Media Info

• Features: References;
• Pagination: p. 40-6
• Serial:
  • TUNNEL MANAGEMENT INTERNATIONAL
  • Volume: 7
  • Issue Number: 2
  • Publisher: ITC LTD
  • ISSN: 1463-242X

Subject/Index Terms

• TRT Terms: Finite element method; Fires; Mathematical models; Temperature; Tunnel lining; Tunnels; Ventilation systems; Walls
• Uncontrolled Terms: Increase
• ITRD Terms: 6490: Finite element method; 1624: Fire; 9032: Increase; 6473: Mathematical model; 6722: Temperature; 3374: Tunnel; 3385: Tunnel lining; 3392: Ventilation; 3368: Wall
• Subject Areas: Bridges and other structures;

Filing Info

• Accession Number: 00978145
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Sep 3 2004 12:00AM