non TEMA tubular Heat Exchanger
non TEMA tubular Heat Exchanger
(OP)
Dears,
I have an issue with a tubular heat exchanger which was not designed according to TEMA. I have to perform a checking/rating, but I can't set up the geometry according to the datasheet. The program I would like to use for the calculation is Aspen HTFS (which performs TEMA only design calculations).
It has 2 passes on the shell side, that's mean, according to TEMA that the shell is Type F (2 pass shell with long baffle).
But... on the tube side it has an odd number of passes (7 passes), which, according also to TEMA, it is not possible with an F shell. I was thinking that it looks like an AFL, but I need an odd no. of passes on tubes.
Any idea of how can i set up the geometry? or how can i perform the calculation?
I also attached the DS and dwg. of the HX.
https://rapidshare.com/files/3332794650/dwg.JPG
https://rapidshare.com/files/3001812452/ds.JPG
Thank you.
I have an issue with a tubular heat exchanger which was not designed according to TEMA. I have to perform a checking/rating, but I can't set up the geometry according to the datasheet. The program I would like to use for the calculation is Aspen HTFS (which performs TEMA only design calculations).
It has 2 passes on the shell side, that's mean, according to TEMA that the shell is Type F (2 pass shell with long baffle).
But... on the tube side it has an odd number of passes (7 passes), which, according also to TEMA, it is not possible with an F shell. I was thinking that it looks like an AFL, but I need an odd no. of passes on tubes.
Any idea of how can i set up the geometry? or how can i perform the calculation?
I also attached the DS and dwg. of the HX.
https://rapidshare.com/files/3332794650/dwg.JPG
https://rapidshare.com/files/3001812452/ds.JPG
Thank you.





RE: non TEMA tubular Heat Exchanger
RE: non TEMA tubular Heat Exchanger
Best regards
Morten
RE: non TEMA tubular Heat Exchanger
Thank you very much for your interest in trying to help me.
@EnergyMix: I attached again the datasheet. I hope the picture quality is better. The datasheet states there are 7 passes and the drawing also shows an odd no. of passes. Inlet - nozzle N1, left head; Outlet, N2, right end.
@MortenA: Since it's a checking/rating or simulation case (and not a design) I assume I should use exactly the geometry of the vendor and the tube passes to be always uneven (7 passes).
I was thinking to estimate it as an AFL with 6 and 8 passes and for a conservative approach I would use the pressure drop of the 8 passes HX (for 7 it should be lower) and the heat exchanged of the one with 6 passes (it should be a bit higher for 7).
Kind regards,
RE: non TEMA tubular Heat Exchanger
I guess i just cant read the drawing and get to the same configuration as the DS.
RE: non TEMA tubular Heat Exchanger
You need to run these variations to get the sensitivity.
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Plymouth Tube