Shts n Giggles (beer/heat transfer)

toyotafreak

toyotafreak

they call me spaz
Joined
Nov 14, 2006
Location
China Grove/Mooresville
While having a few beers and doing some heat transfer homework.. A buddy asked a question, figured its applicable to beer drinkin' so I'll share it...:beer::beer:

Elliott:
What is the heat transfer from a beer can at 30 degrees Fahrenheit with an ambient temperature of 70? You can assume the effects of radiation are negligible.

Solution:
Assumptions: Steady-state;3-d convection; No heat gen; Laminar Air flow...blah blah....

The approx Heat Transfer: q=(Tc-Tair) }hdA * I used the symbol ,}, to denote integral across surface area)
Using Reynold/Nusselt/Prandtl for ambient air at 305K

So Heat Transfer: q=19500 (Btu/hr)

Applying an Energy Balance at an instant, i... (E_in = E_out)
... dT/dt]i = 0.008 (deg F/sec)

... so it is increasing temp at a rate of 0.006 to 0.008 degrees per second *(assuming its is full...in which now it is not, and I'm going to bed)

So what does this mean... drink more beeer:beer:
 
I can appreciate this. You a building science major or doing thermodynamics work for engineering?

So would Q, in this scenario, show BTUs lost over the entire bottle warming up to room temp?
 
saw a can coozie on a RV/camping tradeshow this week that held a can/bottle of whatever at the same temp that you put it in at for 2 hours. didnt require batteries or freezing. how does that work (or not)?
 
toyotafreak said:
While having a few beers and doing some heat transfer homework.. A buddy asked a question, figured its applicable to beer drinkin' so I'll share it...:beer::beer:
Elliott:
What is the heat transfer from a beer can at 30 degrees Fahrenheit with an ambient temperature of 70? You can assume the effects of radiation are negligible.
Solution:
Assumptions: Steady-state;3-d convection; No heat gen; Laminar Air flow...blah blah....
The approx Heat Transfer: q=(Tc-Tair) }hdA * I used the symbol ,}, to denote integral across surface area)
Using Reynold/Nusselt/Prandtl for ambient air at 305K
So Heat Transfer: q=19500 (Btu/hr)
Applying an Energy Balance at an instant, i... (E_in = E_out)
... dT/dt]i = 0.008 (deg F/sec)
... so it is increasing temp at a rate of 0.006 to 0.008 degrees per second *(assuming its is full...in which now it is not, and I'm going to bed)
So what does this mean... drink more beeer:beer:
Click to expand...

So after reading this I...
1. wonder if the same applies to a Diet Sun drop ( don't drink)
and
2. Really just don't feel any smarter
and
3. If Bacon were involved then I have to wonder if the equation would hold true.
 
I don't know about keeping it cold, but Mythbusters did some cool tricks to get a beer cold FAST. They said the best way was with a fire extinguisher. Got it from room temp to icy cold in seconds. Next best way was a salt/ice mixture. I don't know d!ck about thermodynamics, but I have a Master's Degree in drinking cold beer.

p.s. they said that the fire extinguisher did leave a REALLY funky taste on the can.
 
336wheeler said:
I can appreciate this. You a building science major or doing thermodynamics work for engineering?

So would Q, in this scenario, show BTUs lost over the entire bottle warming up to room temp?
Click to expand...
You fail already, didn't read the problem, beer can not beer bottle, minus 10 pts for incorrect assumptions. :beer:

Oh Thermo 1/2 were some of my best classes:flipoff2: I slept through Heat Transfer though, 8am was too early, and I despised differential equations anyway.
 
this Heat Tx wouldnt be an issue if you were drinking good beer instead of sNatural Light. But I remember the college daze... heat loss in cheap beer is best combatted by minimizing the time from 12oz to 0oz. in the container :beer:
I also remember themo, heat transfer, and diff. eq. classes, ugh :confused:

EDIT...good post brent!
 
336wheeler said:
I can appreciate this. You a building science major or doing thermodynamics work for engineering?
So would Q, in this scenario, show BTUs lost over the entire bottle warming up to room temp?
Click to expand...

You are correct about the 'q', and I'm finishing up a mechanical engineering degree at Uncc... I made quite a mess of it when I started college trying to have a social life and do engineering as a secondary priority like most college students, needless to say doesn't work with engr'n... Well with me at least, feel like I work my ass off for a B or C. I'm much more inclined to work with my hands, just need a piece of paper I reckon these days.

About the can insulator, must be a freaking sweet one...but with nanotechnology they do some crazy stuff, gels with microfibers suspended in them, or types of gas filled panels/foams....it would still have a rate of heat transfer through it, but would be so little it could be assumed negligable
 
the problem isnt the 70 degree air...its the 98 degree hand wrapped around the can.
I combat this problem by minimizing cold escape by placing my lips over the opening and sealing off the escape route.

never a problem.
 
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all I know is that I like beer....and bacon.
 
Aluminum is a good conductor of heat. This is one reason I drink my beer from bottles. Glass is a better insulator. Also, the good beer dosent come in cans.....




As I take another swig from my Killians....
 
the problem with coozies is that the top is open, and there is the spout that is open directly to the surrounding air. no matter how awesome the coozie material is, it won't keep the beer at the same temp for 2 hrs. they are good for keeping the cold off your hands though.

and i took heat transfer at state last summer..good times
 
This will help
awww.myscienceproject.org_coldbeer_beer_10.jpg


http://www.myscienceproject.org/rice.html
 
benXJ said:
the problem with coozies is that the top is open, and there is the spout that is open directly to the surrounding air. no matter how awesome the coozie material is, it won't keep the beer at the same temp for 2 hrs. they are good for keeping the cold off your hands though.

and i took heat transfer at state last summer..good times
Click to expand...
Id say if you take 2 hours to finish a beer you're doing it wrong
 
When I received a notification letting me know someone "liked" my post from April 2011, I was like "WTF?" lol
 
Lol i just noticed that somehow it showed up in the current unread for me on my phone app
 
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