Shell and Tubes Exchanger Rating
Simulate chemical processes using advanced thermodynamic models
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Hello,
I simulated shell and tubes heat exchanger as in attachment "Datasheet". But something wrong, the ressults of dwsim was validate =) offcourse before some conclusions. The Re numbers, efficiency , log mean temperature and etc are not correctly. I am also send as attachment "Heat exch_backup_backup_backup". Tell me please what wrong? Why it is not corespond with correct data? Where is a mistake?
Thank you,
Ivan
It is very unlikely that you can fully reproduce in DWSIM the heat exchanger datasheet.
The properties used in the datasheet are taken from unknown sources and so are the margins used by HE manufacturer in design.
So a certain gap between the datasheet and the simulation results is unavoidable.
But the results' order of magnitude should be the same and if you want to verify this match with DWSIM there are some actions that you can take.
First: if your cooling fluid is water, always use Steam Tables as property package. For gas PR is ok.
Next: in HE-01 design, try to match the datasheet's outlet temperatures for both fluids solving alternatively for cold and hot fluid outlet temperature. Here 40'C is specified for both streams: adjusting manually, you can converge to 40.83'C.
Finally: use the datasheet U in the HE-01 Calculate Area mode to calc the area: here I found 41.9 m2 vs 48.3 m2.
Below the simulation results closest to the datasheet's figures.
Hope it helps.
Luca