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Temperature Cross Heat Exchanger

heat exchanger temperature cross

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#1 alekso

alekso

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Posted 12 August 2019 - 12:47 PM

Hello,

 

I would like to ask if a temperature cross (Hot outlet - Cold Outlet < 0 ) is possible to reach in a TEMA Type Heat Exchangers with 2 tube passes. 

Let's imagine to have  a BEU TEMA Type exchanger (2 tube passes, 1 shell pass) where in both shell and tubes we have hydrocarbons.

If for the design case (highest duty and highest flowrate) we have considered a temperature approach Hot Outlet - Cold Outlet = 0, at reduced duty and flowrate (both on tube and shell side) it's possible to have temperature cross (Hot outlet - Cold Outlet < 0 )?

I've simulated with PRO/II the two scenarios (design and reduced flowrate) and, keeping for both the UA calculated in the design case, I got a temperature cross for the reduced flowrate case. Is this possible? Lot of forums say that temperature cross is not possible in multipass heat exchangers.

 

Thank you.

 

 






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