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Overall Heat Transfer Coefficient In Block Type Heat Exchanger


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#1 S.R.Shah

S.R.Shah

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Posted 05 June 2016 - 09:13 AM

Dear Sirs

 

Working on Designing reboiler and condenser with Graphite Block type heat exchanger

 

Block type heat exchanger is cross flow heat exchanger.Holes  are drilled for different fluids in a block.i.e. All heat phenomena can be considered tube side for both fluids.

 

My question is how  to calculate Overall Heat transfer coefficient for block type heat exchanger or by which formula.Formula for Shell and tube heat exchanger cannot be used.

 

I would like to correlate with Shell and tube heat exchanger by using heat transfer coefficients tube side for both sides.By this way one can use standard correlation for shell and tube heat exchangers

 

Request to give me either formula or better if excel spread sheet or literature

 

Thanks in Advance

 

Regards

 

Samir 


Edited by S.R.Shah, 05 June 2016 - 03:42 PM.


#2 breizh

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Posted 05 June 2016 - 05:29 PM

Hi Samir ,

 

You may contact those guys to get data : 

 

https://www.mersen.c...s-mersen_02.pdf

 

http://www.cepic.eu/...eat-exchangers/

 

http://www.louisvillegraphite.com/

 

 

Hope this helps 

 

Breizh


Edited by breizh, 05 June 2016 - 06:42 PM.


#3 S.R.Shah

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Posted 05 June 2016 - 08:07 PM

Hi Breizh

 

Thanking you for useful information .But still not clear

For Shell and Tube Heat Exchanger

1/ UD =1/(hi *(Di/Do))+ 1/ho +1/(hsi *(Di/Do))+ 1/ho +( 2.3Do/2km)*Log(Do/Di)+1/hso

(Reference-D.Q. Kern)

 

I can take hi and ho considering both  tube side Heat transfer. And hso and hso,Thermal conductivity factor may be ignored due to high thermal conductivity

I am not clear about Do and Di for block heat exchanger

 

Please advise

 

Regards

 

Samir



#4 S.R.Shah

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Posted 05 June 2016 - 09:21 PM

Hi Breizh

 

Got the reply .Assuming tube thickness and considering hole dia .as Tube ID ,we can corelate with shell and tube heat exchanger

 

Thanks

 

Samir



#5 sharmaji_c

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Posted 13 September 2016 - 02:20 AM

Samir Sir,

 

   can you share the calculation with us . . ??

 

Thanks



#6 Dipankarc84

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Posted 18 September 2016 - 05:49 AM

Hi Mr. Shah,

 

Thanks for sharing your problem and findings. The correlations for turbulent and laminar flow are different. The more popular correlation is for turbulent flow (e.g. Sieder Tate equation). However, perhaps the hole diameters in your graphite blocks will be much smaller than the typical tube IDs of 15.7, 19 or 25 mm. In that case, there is a chance that your flow regime might be laminar inside the holes. I am sure you have taken care of this. But just in case you missed it, would be worthwhile to check the Reynold's no. of the fluids.

 

Regards

Dipankar






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