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afak
23-04-2016, 08:37 PM
Hi to every one
As a ROT (Rule Of Thumb) it is said:

2.4 GPM/Ton cooler water flow.

400 CFM/Ton air handling unit air flow.

3 GPM/Ton cooling tower water flow.

(??) CFM/Ton cooling tower air flow.

This last ROT is unknown for me.Though there is many reservations about the the accuracy of ROTs. I see that ROTs are a Course approaches versus Fine approaches of calculations.Tough... they facilitate fast evaluations and views. I will be very thankful to answer me and any additional help for advance.

Josip
23-04-2016, 10:37 PM
Hi, afak :)


Hi to every one
As a ROT (Rule Of Thumb) it is said:

2.4 GPM/Ton cooler water flow.

400 CFM/Ton air handling unit air flow.

3 GPM/Ton cooling tower water flow.

(??) CFM/Ton cooling tower air flow.

This last ROT is unknown for me.Though there is many reservations about the the accuracy of ROTs. I see that ROTs are a Course approaches versus Fine approaches of calculations.Tough... they facilitate fast evaluations and views. I will be very thankful to answer me and any additional help for advance.


Check this, please....

https://books.google.hr/books?id=xPDRBQAAQBAJ&pg=PA174&lpg=PA174&dq=cfm/ton+cooling+tower+air+flow&source=bl&ots=TDTrNH6yiX&sig=wvfqkjqrZl67D_mI3u6hWG524YA&hl=en&sa=X&ved=0ahUKEwiM1_Ge16XMAhXHOhoKHbbJBgUQ6AEISzAF#v=onepage&q=cfm%2Fton%20cooling%20tower%20air%20flow&f=false

https://www.google.hr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwiM1_Ge16XMAhXHOhoKHbbJBgUQFggtMAE&url=http%3A%2F%2Fweb.stanford.edu%2Fgroup%2Fnarratives%2Fclasses%2F08-09%2FCEE215%2FReferenceLibrary%2FCoolingTowers%2FCooling%2520Tower%2520Analysis.doc&usg=AFQjCNHBS8YhIPbi0rVv9hr0zHOGRPnp5w&sig2=M1-3iMQ4qmAiu-vGCchdPg


https://www.scribd.com/doc/18185824/HVAC-Design-Thumb-Rules


Hope this will be of some help...

Best regards, Josip :)

afak
24-04-2016, 11:23 AM
Thank you Josip. Scanning more than one cooling tower specifications sheets it seems round 250 CFM/Ton.
"Nominal tons of cooling represents the capability to cool 3 USGPM
of water from a 95F entering water temperature to an 85F leaving
water temperature at a 78F entering wet-bulb temperature" (manufacturer notice).

Glad to hear any corrections to this notice and to what extent could be used as ROT.:confused:

Josip
25-04-2016, 07:34 AM
Hi, afak :)



Hi, afak :)




Check this, please....

https://books.google.hr/books?id=xPDRBQAAQBAJ&pg=PA174&lpg=PA174&dq=cfm/ton+cooling+tower+air+flow&source=bl&ots=TDTrNH6yiX&sig=wvfqkjqrZl67D_mI3u6hWG524YA&hl=en&sa=X&ved=0ahUKEwiM1_Ge16XMAhXHOhoKHbbJBgUQ6AEISzAF#v=onepage&q=cfm%2Fton%20cooling%20tower%20air%20flow&f=false

https://www.google.hr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwiM1_Ge16XMAhXHOhoKHbbJBgUQFggtMAE&url=http%3A%2F%2Fweb.stanford.edu%2Fgroup%2Fnarratives%2Fclasses%2F08-09%2FCEE215%2FReferenceLibrary%2FCoolingTowers%2FCooling%2520Tower%2520Analysis.doc&usg=AFQjCNHBS8YhIPbi0rVv9hr0zHOGRPnp5w&sig2=M1-3iMQ4qmAiu-vGCchdPg


https://www.scribd.com/doc/18185824/HVAC-Design-Thumb-Rules


Hope this will be of some help...

Best regards, Josip :)


whatever is value ... it will be always ROT ... all depend on your choice ...

for me ROT is only good when you speak with your client to give some general picture about plant, unit etc ... at the end one real calculation must be done ... as you wrote in your first post ....

...as your client I wouldn't accept your offer without full calaculation ;)


Best regards, Josip