In HYSYS, what's the difference between a shell and tube from type E and a shell and tube from type F?
Why would changing the shell and tube type from E to F eliminate the error "low Ft correction factor?"
Thanks
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Posted 29 November 2015 - 09:05 AM
In HYSYS, what's the difference between a shell and tube from type E and a shell and tube from type F?
Why would changing the shell and tube type from E to F eliminate the error "low Ft correction factor?"
Thanks
Posted 29 November 2015 - 06:15 PM
The LMTD Correction Factor depends on the number of shell passes. An E type shell has 1 shell pass and a F shell has 2 shell passes. Two shell passes gives a higher Correction Factor
Posted 04 December 2015 - 10:03 AM
The correction factor is the ratio between the actual MTD and LMTD.
MTD=LMTD only if the two fluids flow is 100% countercurrent.
For example, a STHE with E shell + 2 pass tubes means 50% countercurrent (if the baffles effect is neglected, which means also cross flow zones), while a STHE with F shell + 2 pass tubes means 100% countercurrent (again, if the baffles effect is neglected). If the shell is of F type, but the tubes pass no. > 2 then MTD < LMTD.
Also, the position of the shell inlet and outlet nozzles influence the value of MTD.
Posted 07 December 2015 - 12:18 AM
Thanks a lot srfish and Lucian for your help
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