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...
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...
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...
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...
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...
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...
