Shell and tube reheaters rating

[sheiko]

Dear all,

I have attached an Excel spreadsheet that describes my problem and the solution i propose. Could you please insert your comments on it.

In brief, i have a shell and tube reheater that i want to rate after a capacity increase on process side (natural gas)but, as shown in the spreadsheet, some data of the initial design are missing...

Thank you in advance.

"We don't believe things because they are true, things are true because we believe them."

 

[srfish]

Since the increase in capacity will increase the overall heat transfer coefficient you could increase the accuracy of UA in the second step. The gas heat transfer coefficient will vary with approximately th 0.8 power. This could be used to calculate a new UA.

 

[sheiko]

Thanks but assuming UA constant is conservative, right?

Plus, do you think my approach sensible and correct as a preliminary rating?

"We don't believe things because they are true, things are true because we believe them."

 

[chicopee]

What happened to the original operator's manual and specifications for the info. that is missing?

 

[sheiko]

Not yet received and i agree that it is necessary. However from an intellectual point of view i would like to know if my approach is sensible and correct...

Thanks for your time.

"We don't believe things because they are true, things are true because we believe them."