Enthalpy balance of PFR

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Enthalpy balance of PFR

Postby hiren » 03 April 2019, 07:11

Dear Jasper,
The attached flowsheet is simulation of PFR for methanol synthesis from CO,CO2 and H2O. The wall heat transfer coefficient is set to zero and tube heat transfer coefficient have been set to 500 W/m2.K . On running the simulation, it is found that the enthalpyF balance is not zero. Can you explain this? I thinl it should be zero.
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hiren
 
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Re: Enthalpy balance of PFR

Postby jasper » 08 April 2019, 13:20

Aplogies for the delay - somehow the RSS feed stopped working and I missed your post.

You seem to have cooling / heating tubes enabled.

Annotation 2019-04-08 151958.png
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Re: Enthalpy balance of PFR

Postby jasper » 08 April 2019, 13:25

EnthalpyF duty is zero (within tolerance) if you either set the number of tubes to zero or the heat transfer coefficient to the tubes to zero.
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