Thunderhead Engineering Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Forum moved to https://forum.thunderheadeng.com

Author Topic: I need a help  (Read 2387 times)

smcsaminda

  • New Member
  • *
  • Posts: 6
    • View Profile
I need a help
« on: January 06, 2014, 10:07:51 pm »

Hi All,
I'm designing a SHEVS (Smoke and Heat Exhaust Ventilation System). I collected the guidance from BS 7346, NFPA 92 B, Simplified Method for designing a Mechanical Smoke Exhaust System for high-rise building etc.
my building is a 10 floor building whose floor area is around 3500 square meter each. a floor consists of about 10 nos of office rooms and they are connected to a corridor. there are no balcony. fire staircases are located inside the building. All doors and staircases have been designed according to the BS 9999. All doors are connected to door closers.
If a fire started in a room occupants come out from that room to corridor and evacuate through the staircase. my plan is to extract smoke from corridor area to help for a safe evacuation. A vertical shaft is used as the smoke extraction shaft. And simultaneously staircases are pressurized. I have some issues as follows,
1. When I create a fire in a room, do I need to keep the door of that room opened?
2. When I calculate extraction rate manually, how can I do that? How do I calculate the smoke spills through the door.
please help me...
« Last Edit: January 16, 2014, 11:06:14 pm by smcsaminda »
Logged

smcsaminda

  • New Member
  • *
  • Posts: 6
    • View Profile
Re: I need a help
« Reply #1 on: January 15, 2014, 11:47:53 pm »

Hi all,
still I'm finding a solution.
My major problem is that when I do a CFD simulation (or manual calculation) for a created fire in the office room, do I need to keep open the door of that room? please help me.
Logged

Charlie Thornton

  • Thunderhead
  • *****
  • Posts: 851
    • View Profile
Re: I need a help
« Reply #2 on: January 16, 2014, 10:38:56 am »

When running a simulation, an OPEN surface can be very helpful in avoiding problems with the pressure solver - otherwise the in and out flows need be be balanced.

I don't have any advice for the door specifically, but maybe someone else will have a suggestion.
Logged

Wojciech_Stigo

  • Member
  • **
  • Posts: 10
    • View Profile
Re: I need a help
« Reply #3 on: January 24, 2014, 07:05:00 am »

I suggest You to maintain door opened during evacuation, next You should close the door using controller. After evacuation, smoke will infiltrate thought leaks. It is possible to model leaks using HVAC small duct in the door. To do that You need Pyrosim 2013 or 2014.
Logged