Convection in isolated box (please help)
Convection in isolated box (please help)
(OP)
Hi,
I do not have much knowledge about this. Please help me :)
I have a question. If cooling elements (e.g. ice) put inside an isolated box, is the surface area of the cooling element matter or not? With the same weight but different area, is matter or not?`
Thanks. I appreciate your help.
I do not have much knowledge about this. Please help me :)
I have a question. If cooling elements (e.g. ice) put inside an isolated box, is the surface area of the cooling element matter or not? With the same weight but different area, is matter or not?`
Thanks. I appreciate your help.





RE: Convection in isolated box (please help)
if box isolated, from a long-term thermodynamical equilibrium point of view, no difference, when time is infinite, result only depends on the total heat capacity (mass, Cp, and latent heat - if phase change involved) and the starting temperature of the cooling element.
from a kinetic point of view (time evolution of temperature profiles, etc.), many complex factors are involved and many other things matter.
Not sure to understand your question,
BR,
RE: Convection in isolated box (please help)
RE: Convection in isolated box (please help)
RE: Convection in isolated box (please help)
If the box is isolated, the end result (infinite time) will arrive when the content reaches thermodynamical equilibrium.
From a heat transfer point of view, that means equal temperature.
since isolated, end result can only depend on starting condition.
Any two starting conditions that are equivalent will lead to the same end-result.
Now, do you think that splitting the cooling agent (with no variation in mass nor temperature) into two pieces changes in anyway the staring condition of the cooling agent, from the point of view of overall thermal energy in the cooling agent?
BR,
RE: Convection in isolated box (please help)
Shouldn't be the thinner the cooling element, will melt faster than the thicker one?
RE: Convection in isolated box (please help)
end-result
time infinite
Faster is a time-dependant concept.
Do not confuse the end-result with the time-dependant path to the end result.
Time-dependant path to the end result is a complete different story, since it has to do not with thermodynamics but rather with kinetics
RE: Convection in isolated box (please help)
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: Convection in isolated box (please help)
RE: Convection in isolated box (please help)
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Convection in isolated box (please help)
Nope. I do not learn much about thermmodynamics. Sorry to bother you.
RE: Convection in isolated box (please help)
My suggestion: you buy for less than 15$ a thermometre in Amazon (i.e. ThermoPro TP-50) that measures temperature and stores min and max temp. Place inside box + trial and error. Worst case scenario it will take you a couple weeks to get an acceptable solution.
BR;
RE: Convection in isolated box (please help)
Can you get more insulation, as it appears that you're describing a basic Styrofoam cooler, and a wimpy one, at that. You need a minimum of 12kg of ice to meet the requirements. Since your volume is is 37 liters, you could cram about 37 kg of ice in there, if your product was small.
You could put your cooler inside a bigger cooler.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Convection in isolated box (please help)
RE: Convection in isolated box (please help)
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm