We did a 40,000 sqft 36F beer cooler with a 44 ft high ceiling and used wet ESFR's. The AHJ (Phoenix) was concerned about freezing so after the cooler was up and running we put in a half dozen temperature recorders some in front of blowers, some 20 ft above the floor, 6 ft off the floor at ceiling, well you get the idea. After a week of recording temps every 5 minutes the results were pretty amazing. Nothing varied more than 1 degree, usually less than .5.
Ron F -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of ampeck Sent: Friday, July 12, 2013 9:26 AM To: [email protected] Subject: Re: dry pnds off dry system Ron that is kinda interesting, making me think. Of course cold air falls and hot air rises so unless a sprinkler line is close, depending on many factors, to the units the air is always going to be warmer at the roof where the sprinkler pipe is at. I think most everyone(the sales guys I've dealt with), just to err on the side of safety, says if it says <40 you put in a dry or preaction system or use dry pendents is a small cooler. I would assume if a cooler was 34F the unit has to be of producing colder than 34F to maintain it. Depends of the BTU output and the placement of piping in relation to the unit I would assume. But most of my experience has been with large warehouses. And as far as BTU output it can take a long time to bring those coolers, mine have being larger, down to temperature. Like a week or so, but I don't know really what's all involved in starting those system and the process. I have to look this up but what can cause ice build up faster, with the temperature hovering around freezing. Water filled pipe or dry system with humidity in the air. I would say humidity in the air from a air dryer not working correctly is worse. But I haven't thought about it until now. In water filled pipe the unit has to bring the temperature of the surrounding water down enough to freeze. Nothing new to add just wanted to say your email just sparked my curiosity about this. Aaron P On Jul 12, 2013, at 10:58 PM, [email protected] wrote: > How many coolers can be turned into freezers using the same refrigeration > equipment? The refrigeration units in coolers don't usually have the BTU > capacity to bring the temp down to 28F and keep it there. We have installed > hundreds of wet systems in 34F/35F coolers and have never had a freeze up. 13 > says that it has to be below 40f "and" subject to freezing, it doesn't say > "or" subject to freezing. > > Ron F > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Matt > Grise > Sent: Friday, July 12, 2013 8:39 AM > To: [email protected] > Subject: RE: dry pnds off dry system > > I would be careful using a wet system even if it is called a "cooler". The > evaporation coils can blow out air that is below freezing in order to get the > whole cooler down to its target temp. > > Also- just because they say they will keep it at 41 does not mean that they > won't change their mind after it has been installed and dial it down. > > Matt Grisé PE*, LEED AP, NICET II > Sales Engineer > Alliance Fire Protection > 130 w 9th Ave. > North Kansas City, MO 64116 > > *Licensed in KS & MO > > 913.888.0647 ph > 913.888.0618 f > 913.927.0222 cell > www. AFPsprink.com > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Martinez, Dewayne > Sent: Friday, July 12, 2013 10:34 AM > To: [email protected] > Subject: RE: dry pnds off dry system > > The building footprint is 3800sf so I could eliminate a control valve and a > main by staying all dry. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Friday, July 12, 2013 10:12 AM > To: [email protected] > Subject: RE: dry pnds off dry system > > If it's a "cooler" and not subject to freezing you can put a wet system in it. > > Ron F > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Martinez, Dewayne > Sent: Friday, July 12, 2013 8:15 AM > To: [email protected] > Subject: dry pnds off dry system > > I have a small building which has both unheated / heated spaces. I am going > to run the entire building as a dry system with standard pnd heads on return > bends in the heated areas with ceilings. There is a cooler in the heated > area that will need sprinkler protection in. Can I still put standard pnds > on return bends (in the heated area) for the cooler or do I need to drop dry > pnds? > > Thanks, > > Dewayne > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler > .org > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler > .org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
