Floyd's comment) made me appreciate how incorrect my makeup air location & vent size was. However when I ran the model with a tighter resolution, I did the the plume lean near 45 degrees towards the 'east' door! Definitely not appropriate, and (in accordance with Dr. I just didn't think originally that i'd have such an impact. The model was reporting 2.5 m/s through the doors, which I knew was above the 1 m/s maximum required by code. Floyd's apt comment, I had modified my input file to increase the amount of supply air to the model - and i'm actually supplying air, vs. Also boosted my mesh resolution to help define the flow in that drop ceiling. I've started running a new model with the fans on the ceiling with no holes created, and will see how that shapes up. Something I should have understood after reading the manual. I didn't even think about the holes affecting the flow - my other modeling experience (other programs) have surfaces that act just as fans, not as fans and exit boundary for the model. This is excellent advice, I sincerely thank you. Does anyone know what I need to put into the file to get Plot3D to show up in Smokeview? The reaction chosen is a modified polyurethane reaction, with a defined Soot yield of 0.07 g/g.Ĭan anyone provide insight on why this might be happening? Did I misuse the exhaust vents, or pick an improper reaction? Would appreciate all help, i'm becoming quite frusturated.Īlso, on a side note, I cannot get Plot3d to function, both using the input file and through using Pyrosim.
Yet I cannot seem to stabilize my smoke layer - it continues to descend during the exhaust process. My fans are triggered by a beam detector located approximately at my "highest level of egress" cutoff.the fans should activate at full blast at 25' and plugholing should be nullified due to the thick smoke layer beneath. I have 5 vents uniformly distributed in location & exhaust rate. I have set up the design fire size and HRR at 10x10 & 20 btu/s/ft2, and set my exhaust vents to match the exhaust volumetric flow rate of ~60,000 CFM required by code. The problem I am having is I cannot get my smoke layer to stabilize at the "Smoke Layer Height Above Highest Level of Egress" point. I'm using FDS to simulate a mechanically ventilated smoke exhaust system to verify a prescriptive design calc I did as per NFPA 92.
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