Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. blackarrow90

    Design of the ducts and outlet surfaces

    I agree, probably the worst part of it is the transitions from the duct to the plenum. If my calculation is right, the velocity in the vertical duct (shaft) should be around 32 ft/s. If the plenum is 10 ft long and 1.3 ft high the velocity here will be even lower, around 19 ft/s. I guess these...
  2. blackarrow90

    Design of the ducts and outlet surfaces

    Thank you for the explanation. However, for me it is not clear which cross-section has to be taken into account in the example I mentioned above (the dimension marked with "?" in the sketch). Once the supply air exits the vertical shaft it enters the horizontal duct which goes left and right...
  3. blackarrow90

    NFPA 92 and building with small atrium openings

    I understand that the natural supply would be the first option, however, until the smoke reached the extraction point at the top, its spreads and endangers the floors in between. I validated it using FDS and as you mentioned, "capped" the HRR curve once the sprinkler activates (HRR constant...
  4. blackarrow90

    Design of the ducts and outlet surfaces

    Hello I have a question related to the dimensioning of the ducts and outlet surfaces in case of fire. I am not an HVAC but a fire safety engineer and would like to understand the background on how the cross-section of ducts is designed. Basically, there is a vertical shaft in the building...
  5. blackarrow90

    NFPA 92 and building with small atrium openings

    The draft curtains around the open space (or placed horizontally) would be the simplest solution, however, this is not desirable. There are draft curtains that are 1.3 feet high and located at the ceiling around the open space. This helps, but not a lot since these small curtains are quickly...
  6. blackarrow90

    NFPA 92 and building with small atrium openings

    Hello Currently, I am working on finding a solution for smoke extraction in an atrium building. The building has 5 floors with 10.000 sqft each. According to the NFPA 92, this is a type of spill plume, since the fire would start on one of the floors and spill to the open space in the middle...

Part and Inventory Search

Back
Top