Thanks Roland. Please let me briefly explain my modeling game plan, so I can get some suggestions for improvement, or "don't waste our time- the heat will go up". For the case of the 2' perimeter open to above, the velocity of the ceiling jet will be say, 10 ft/sec, get to the opening, go up, and then, obeying what I now call The Law of Roland's Momentum, bounce off the wall and move back toward the middle above the ceiling. This is what scares me about a firm number like 15', 24', and especially something times the square root of the design area below. Call that number X. Call the height of the low ceiling Z1, and the dimension from the low ceiling to the bottom of the deck Z2. I want to see how X varies as a function of Z1, Z2, the area of the opening, and the cube of the space above, over time.
Btw what does ROP stand for? Brad -----Original Message----- From: Roland Huggins [mailto:[email protected]] Sent: Thursday, December 16, 2010 10:09 AM To: [email protected] Subject: Re: Ceiling "Clouds We submitted a proposal attempting to get the TC to define how big a gap is too big. We started with allowing no more than 6 inches without sprinklers above the drop ceiling. The ROP meeting is early Feb. Roland On Dec 15, 2010, at 12:40 PM, Brad Casterline wrote: > Thom, > > I am not as confident as you are about applying FIGURE A.8.15.22.3 to > Jimmy's scenario: in the figure, both ceilings go wall to wall and > the fire > is not under the low ceiling. This whole above and below 'cloud' > subject is > more difficult and fascinating than it struck me at first- I am > going to > model about a thousand different set-ups to see where the heat goes > when it > gets above the opening, just to get a better personal feel for it. > > Brad > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
