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zeeshan.ajmal
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Join Date: Apr 2009
Posts: 5

Equilibrium temperature

03/26/2010 4:03 PM

I initially have 70 cubic meter of water at 25 C. 15 Cubic meter of it returns at temperature of 35 C and 55 Cubic meter is added fresh at 25 C after one hour. The cycle continues. Of course the return water temperature and mixture temperature will increase after hr by hr slowly and slowly. At what temperature the equilibrium point will be reached and how?
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redfred
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Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

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#1

Re: Equilibrium temperature

03/26/2010 4:23 PM

The only thing missing from this thermodynamics homework question is the list of other thermodynamic unknowns that make this impossible to answer in real life. What might these unknowns be? Well the water starts at 25 C, what temperature is the room? With 70 cubic meters of water available, what is the surface area of the water to atmosphere barrier? What is the humidity level of the atmosphere? Also there's an ambiguity in your question as to how much water you have in total, 70, 125 or 140 kilo-liters?

Please do your own homework.

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Anonymous Poster
#2
In reply to #1

Re: Equilibrium temperature

03/26/2010 10:12 PM

Also the removal and addition of water - will add energy to the water body (there is work being done) - even if by buckets. If it is pump then undoubtedly.

Tank - ambient heat transfer

Piping system Losses

Water evaporation

...
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