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farhan071-Visitor
1-Visitor
October 24, 2017
Solved

Finding tube surface temperature for HX tube

  • October 24, 2017
  • 18 replies
  • 5180 views

HI,

I am trying to find the T.s value in this file. Please  help me out. Thanks1.PNGEnergy balance equation on surface of tube (Taking solar energy as source)Energy balance equation on surface of tube (Taking solar energy as source)3.PNG

Best answer by AlanStevens

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):

 

HX.PNG

 

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

 

Alan

 

 

18 replies

T
terryhendicott21-Topaz II
21-Topaz II
October 24, 2017

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

F
farhan071-VisitorAuthor
1-Visitor
October 24, 2017

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.

4.PNG

L
LucMeekes23-Emerald IV
23-Emerald IV
October 24, 2017

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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