Why would heat transference into and out of a plastic bag be different than the same regarding a box except for time lag? Now if directly in the sun you'd get more radiant impingement quicker through the plastic bag, if clear but I doubt if it would be significant. I think people tend to equate how they "feel" regarding their own ability to regulate their body temperature with heat on inanimate objects. Consider the concept of one blanket or coat being "warmer" than another or that it is "cooler" in the shade or when sitting in front of a fan. Is it the insulating properties of the one blanket over the other relative to your ability to produce heat or to some inherent quality of "hotness" in the blanket (electric blankets notwithstanding)? Or is the breeze from the fan wicking away your sweat quicker than evaporation by itself causing you to lose heat quicker and thereby feeling cooler? How about in the shade? Is the ambient air cooler or are you just not being impinged on by both convection and radiation rather then just the former? So put heads in the direct sun, in an environment where heat in is faster than heat out and maybe, but I gots to think it would have to be in Death Valley or somewhere equivalent.
On Thu, Aug 12, 2010 at 10:17 AM, Greg McGahan <[email protected]> wrote: > Anybody ever heard that if you put sprinklers in plastic bags that it can > cause them to fuse when heads in boxes won't - from heat inside trucks etc? > Thanks, > Greg > > > _______________________________________________ > 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) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 253.680.7346 Member: AFSA, SFPE, ASCET, NFPA, NFSA, AFAA, ASEE, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ 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)
