Thanks all for the input. best regards
J.P. Merlino -----Mensaje original----- De: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] En nombre de AKS-Gmail-IMAP Enviado el: jueves, 06 de diciembre de 2012 3:31 am Para: sprinklerforum@firesprinkler.org Asunto: Re: IT Datacenter applications Considering you are asking about the data room only, the data center type you are pointing to is what would be called a hard enclosed hot aisle design. There is what amounts to a return air duct plenum, like a corridor, large enough to walk in, reaching down to the floor behind two rows of computer equipment. There is no raised floor. Cold air is ducted from above to the "cold aisle" in front of the computer equipment. The cold air is drawn through the computer equipment into the ducted hot air return plenum between the rows and then goes up, either ducted or to a common return air plenum above a ceiling back to the air handlers. Since you say the room height is 25 ft. then I would bet there is not a ceiling and therefore the return is entirely ducted. All the cabling, including power and data, occurs in layers of cable trays directly above the computer equipment next to the enclosed hot aisle duct, corridor or whatever you want to call it. Just classifying what what that hot aisle is in this design will be one of your first sprinkler issues. Most, if not all but one, of the "pictures" at that link are computer renderings. Even the ones that seem real look like PR fakes or are way touched up. Figuring out exactly what they show is difficult. The "switch" design is described in more detail here http://www.switchnap.com/pages/rob-roy-originals.php in the patent. The rendered pictures in the example link are rendering a variation of the patent ideas for a hard enclosed hot aisle design. Your question about extinguishing is a loaded question. It generates the questions, "Extinguish what and when?" These data center designs do not think about fire extinguishing in the data room. I say this because they do not actually control electrical power down to the computer cabinet level and the cooling mechanism is also shared between computer cabinets. The electrical power is usually controlled down to perhaps the equipment row level and then they do not want to ever turn it off. This is furthermore complicated by having two power sources, a primary and then the backup to switch to. Thus there is no way to cut power at the machine level. There is also usually no way to cut cooling down to the machine level. Shutting off the air handler, i.e. the cooling, results in all the computer equipment over heating. And by the way of course, the cooling air handlers are also in a shared arrangement. A requirement to stop the air means stopping all the air handlers. In other word s the data design has too many eggs in the same basket from a fire extinguishing point of view. A total flooding clean agent system would require a huge amount of agent. With a 25 foot deck you are likely talking two levels of agent nozzles and big bertha agent tanks in many separate locations. None of that is rendered in those images. One of the primary reasons for all this backup cooling, power and computer equipment is to keep things running at all times. Yet at the same time more and more of the critical function is being concentrated. The same should apply to the fire protection. Perhaps the extinguishing at the computer cabinet level should be a local application system, instead of total flooding application, with all the proper support mechanisms and devices in place to allow for a properly functioning system that allows the remainder of the data center to remain operational. These ideas amount to what might be called a robotic extinguishing system capable of figuring out how to handle a local event. Incidentally, these data centers often have only one person on site. This would be the security guard at the front door. They would not be trained to do anything fast enough but pick up the phone. If our personal cameras can figure out who is smiling in a variable scene then surely a data center extinguishing system could figure out what cabinet, cable tray or whatever needs the proper localized attention to extinguish. Such a system needs to be integrated into the data center. The overlaid systems like the ones we put in now are after thoughts. Allan Seidel St. Louis, MO On Dec 5, 2012, at 3:09 PM, J.P. Merlino <jmerl...@lliconsult.com> wrote: > Forum members: > > I would like to know if anyone has dealt with extinguishing > installations for big IT datacenter rooms, and what was the > application used (wet/dry sprinker, water mist, etc.) > > We are talking of datacenter room similar to the one portrayed in > http://www.switchnap.com/pages/all-things-switch/switch-mod.php. > > The area of the datacenter is around 6500 sq ft and room height is 25 ft. > > Best regards > > J.P. 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