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Finding tube surface temperature for HX tube

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HI,

I am trying to find the T.s value in this file. Please help me out. ThanksEnergy balance equation on surface of tube (Taking solar energy as source)

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AlanStevensAnswer

19-Tanzanite

You shouldn't be solving for Qabs as it's independent of any of the other Qs and Ts. It can be fixed above the solve block. Either (i) you should include an expression for Qcond, including values for conductivity, thickness etc., or (ii) replace Qcond in the first equality within the solve block by Qrad (I suspect Qrad should be included in this first expression anyway, as Luc noted). See below for my suggested solution for (ii):

(I wasn't able to open your .rar file)

Alan

21-Topaz II

Hi,

You have unmatched terms in the Find statement, add Qfluid to right hand side of the equation for consistency.

The left hand side should be a column vector rather than row vector.

If you upload you worksheet by first making it a zip file, it is possible to show you.

Cheers

Terry

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Thanks Terry for your help.

But i have tried it before as you said.Anyhow, i am uploading this file here. Please have a look and point out the error.

Thanks.

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1_HX-Tube-surface-temperature.rar

23-Emerald V

I should expect Qrad to be (also) part of the top equation in the solve block (the one with Qabs=Qfluid+...).

And what about Qcond?

Success!
Luc

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