6 replies to this topic

[namir]

Dear hysys group

Could any one tell me why changing the size or number of tube pass thru the shell not change the result.

Is the hysys could not design the perfect number and size of the tubes????


Thank you very much

Edited by namir, 25 September 2009 - 11:27 AM.

[joerd]

This could be a number of things. First of all, have you set the exchanger calculation mode to "Rating"? If it's set to "Design" the data on the configuration is ignored. Also, be aware that Hysys is not an exchanger design/rating program, so you do need to validate your results using HTFS or HTRI.

[ari]

Dear hysys group

Could any one tell me why changing the size or number of tube pass thru the shell not change the result.

Is the hysys could not design the perfect number and size of the tubes????


Thank you very much

that's true, when you use an heat exchanger in hysys the default heat exchanger model is Heat Exchanger design, not rating, in design we will determine the best specification (tube length, number of tube, shell diameter , etc ) for the given duty , while in rating, we will check the heat exchanger performance with a given specif action,
so i think that's way when you try changing the size of tube hysys gave you the same result
if you want deal with shell & tube heat exchanger i suggest you to use HTRI, HTFS or aspen BJAC

[namir]

thank you very much for this information..

Pleae accept my best regard.

[Skyline]

This could be a number of things. First of all, have you set the exchanger calculation mode to "Rating"? If it's set to "Design" the data on the configuration is ignored. Also, be aware that Hysys is not an exchanger design/rating program, so you do need to validate your results using HTFS or HTRI.

Dear,

How do we change the design mode to rating mode?
Thank you very much.

[joerd]

Go to Design Tab, Parameters page. Then use the Heat Exchanger Model dropdown box and select Steady State Rating.
 Hysys-exchanger.PNG   18.56KB   44 downloads

[Skyline]

Go to Design Tab, Parameters page. Then use the Heat Exchanger Model dropdown box and select Steady State Rating.
 Hysys-exchanger.PNG   18.56KB   44 downloads

Thank you very much for the explanation Joerd. Really appreciate it.