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Aspen Edr

aspen plate edr htfs

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#1 Mina_4

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Posted 12 May 2017 - 10:36 PM

Hello everyone; 

I'm working with Aspen EDR for designing plate heat exchangers. But, the results I get are different from what I calculate based on equations, such as Re number and enlargement factor. Has anyone know that or know anyone that could help?

Any help is truly appreciated.



#2 Nikolay_

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Posted 14 May 2017 - 09:08 PM

Hello,

It depends on equations that you used. It's difficult to imagine the geometry, compositions, parameters. What Is your plate exchanger intended for?



#3 Mina_4

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Posted 20 May 2017 - 10:28 PM

Hello,

It depends on equations that you used. It's difficult to imagine the geometry, compositions, parameters. What Is your plate exchanger intended for?

For instance, I choose M6M (from Alfa Laval) and I know its pressing depth is 3 mm. The Re number equation in plate heat exchanger is :

Re= Rho.Vchannel.De/mu

When I calculate Re and take 2b as equivalent diameter, the answer is far from the result shown. So I changed the way I solve the problem.

First, I divided calculate Re to HTFS Re; Recalculated/ReHTFS >1, and I thought maybe it considers enlargement factor. In other words it uses Dh in Re equation, and Dh in plate heat exchanger is (2.b)/enlargement factor. There are some correlations for calculating this factor. But, it is true for one plate type and for another model like M10M (Alfa Laval), it has great error. What's your opinion? 


Edited by Mina_4, 20 May 2017 - 10:30 PM.


#4 Mahdi1980

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Posted 21 May 2017 - 03:52 AM

Hi Mina,

 

Please let us know your complete case and known parameters of the process as well as the TEMA sheet of your design  by software. Then attach your own calculation. Having know your data, your problem might be solved.

 

Regards,



#5 Mina_4

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Posted 22 May 2017 - 01:07 AM

I have attached an example with software calculation and mine. The part that I've got problem is Re number. And I've pointed out that part. Please check that

 Attached File  1.PNG   387.85KB   1 downloadsAttached File  2.PNG   25.67KB   0 downloadsAttached File  3.PNG   64.34KB   0 downloadsAttached File  4.PNG   29.67KB   0 downloadsAttached File  5.PNG   61.87KB   0 downloadsAttached File  6.PNG   35.2KB   0 downloadsAttached File  7.PNG   50.37KB   0 downloadsAttached File  8.PNG   29.88KB   0 downloadsAttached File  9.PNG   35.98KB   0 downloadsAttached File  10.PNG   58.13KB   0 downloadsAttached File  11.PNG   24.58KB   0 downloadsAttached File  12.PNG   33.23KB   0 downloadsAttached File  13.PNG   21.58KB   0 downloadsAttached File  My calculation-1.jpg   75.64KB   0 downloadsAttached File  My calculation-2.jpg   68.33KB   0 downloads



#6 Nikolay_

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Posted 23 May 2017 - 06:19 AM

I don't understand your's aim. Do you want to verify EDR method? How did you calculate equivalent diameter for Re? Enlargement factor and relation with Re ...Could you please send reference.Did you calculate Nu?

#7 Mina_4

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Posted 23 May 2017 - 10:46 AM

I don't understand your's aim. Do you want to verify EDR method? How did you calculate equivalent diameter for Re? Enlargement factor and relation with Re ...Could you please send reference.Did you calculate Nu?

Yes! because I know the EDR's answers are correct and I want to check my calculation. As you might know, equivalent diameter in plate heat exchangers equals to ( 2xb ), where 'b' is the pressing depth. And for enlargement factor, there some relations in papers...The formulas for plate heat exchangers are in the relevant books and papers.


Edited by Mina_4, 23 May 2017 - 10:47 AM.


#8 Nikolay_

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Posted 23 May 2017 - 10:23 PM

Could you please to share one? I'm interested the methods of plate exchanger design.



#9 Mina_4

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Posted 23 May 2017 - 11:40 PM

Could you please to share one? I'm interested the methods of plate exchanger design.

It's better to study some books about PHEs if you don't know much about it.



#10 Mahdi1980

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Posted 24 May 2017 - 08:25 AM

Mina,

 

Sorry I am too busy nowadays. I will check your data and com back to you as soon as possible.

 

Regards



#11 Mina_4

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Posted 25 May 2017 - 03:12 AM

Mina,

 

Sorry I am too busy nowadays. I will check your data and com back to you as soon as possible.

 

Regards

Thank you for the reply. I'll be waiting.






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