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how long does a keg stay cold

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lil.sis China4650 Posts May 08 2007 01:48 GMT #1 simple question. how long does a keg of beer stay cold if left at room temperature. anyone know from experience? LOL I GUESS I COULD CALCULATE IT WITH MY ENGINEERING KNOWLEDGE

Luddite United States2315 Posts May 08 2007 01:50 GMT #2 If you leave it at room temperature it's not cold. Therefore, 0 time.

iNcontroL USA29055 Posts May 08 2007 01:51 GMT #3 Depends on volume, climate, is it exposed to sunlight through a window? Will a dog piss on it? These are the kinds of things we have to know. BTW HOMEWORK THREAD CLOSE BAD AKlnsvb

MyCrow Korea (South)248 Posts May 08 2007 01:53 GMT #4 Also depends on what you consider cold.

lil.sis China4650 Posts May 08 2007 01:56 GMT #5 a full 1/2 keg, cold enough so that it can be put in ice one hour before a party and be drinkable. air conditioned room (~25 C), no sunlight

lil.sis China4650 Posts May 08 2007 01:56 GMT #6 and yes this is a homework thread PERHAPS THE GREATEST ASSIGNMENT OF MY ENTIRE COLLEGE CAREER

KrAzYfoOL Australia3037 Posts May 08 2007 01:59 GMT #7 somebody is excited

IntoTheWow is awesome32274 Posts May 08 2007 01:59 GMT #8 LOL LIL SIS research aluminium thermal conductivity gogog

Lemonwalrus United States5465 Posts May 08 2007 02:01 GMT #9 What college do you go to?

lil.sis China4650 Posts May 08 2007 02:11 GMT #10 columbia

thedeadhaji 39489 Posts May 08 2007 02:14 GMT #11 let me come help u wit ur assignment lol >>__>>

Lemonwalrus United States5465 Posts May 08 2007 02:15 GMT #12 Damn, given the assignment, I thought I had another Milwaukee student on my hands.

thedeadhaji 39489 Posts May 08 2007 02:17 GMT #13 just get the keg a few days beforehand, and do a CONTROLLED EXPERIMENT GOGOGO CHEM E MAJOR MUAHAHAH

AmorVincitOmnia Kenya3846 Posts May 08 2007 02:24 GMT #14 assuming it's chilled before it's put in the room, it'll stay cold all night.

bdams19 United States1316 Posts May 08 2007 02:26 GMT #15 lol 1/2 keg? what kind of party is that... just get one of those large buckets from walmart with the rope handles and put the keg inside and fill it up with ice.

Xeofreestyler Belgium6771 Posts May 08 2007 02:31 GMT #16 Sounds like a good excuse to test it out

Chill Calgary25981 Posts May 08 2007 02:35 GMT #17 This is a pretty hard question (done accurately). Because the keg is a weird shape you have to do 2D heat transfer instead of 1D, which means you need to use Matlab or Excel to set up a 2D array of nodes representing the height/radius of the keg and then rotate it around 360 degrees. You know the starting temperature inside and the outside temperature. Assume the fluid inside only moves due to natural convection. You have natural convection inside the fluid, conduction through the keg wall and then natural convection in the room outside the keg wall. Assume the bottom of the keg experiences 0 heat transfer (unless you want to do conduction through carpet). Slap all that into Matlab and iterate about 100 times and you'll find the time. I don't want to give better instructions because this was a like a final project I did in heat and mass trasnfer and it took about 2 weeks because we had no idea how to do it. Something about the A x b matrix. As if that helps. Good luck! The MUCH easier way is to assume the keg cools evenly (all the fluid gains heat evenly). I forget what this is called, not steady state, something else with an s. Anyways, then its just: FLUID (T,h) ---- KEGWALL (r) ---- OUTSIDE (T,h) which should be pretty easy to solve but I forget how. haha useless as ever.

OverTheUnder United States2929 Posts May 08 2007 02:39 GMT #18 better chug it fast just in case;o

Hans-Titan Denmark1711 Posts May 08 2007 02:48 GMT #19 I red that as leg, and wasn't surprised that lil.sis had made the thread..

Myrmidon United States9452 Posts May 08 2007 02:50 GMT #20 Heat gain through room radiation is negligible, right? ~_~

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