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How you can calculate the CFM for 1 TR ?

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Question added by Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company
Date Posted: 2014/08/12
shabeer arayapurath
by shabeer arayapurath , Project Engineer(Mechanical-MEP) , Woodland Electromechanical L.L.C

We cant extactly say the CFM for1 Ton. But as per Thumb rule, 

For centralized air conditioning system, I tr=400 CFM

For non centralized conditioning sysytem, I tr=300CFM.

Mohamad Mabsout
by Mohamad Mabsout , Sr. Regional Manager , Rheem Manufacturing MEA

Well goof question most of manufacturers consider400/300 CFM per nominal TR you cannot consider that when your are working on different ambient conditions, since your CFM/TR will change. 

 

For Fresh air application you can consider as a Thumb Role (100 to150) CFM/RT  

Saffii Eldin Helmy Abdel-aal Mohamed Shehab
by Saffii Eldin Helmy Abdel-aal Mohamed Shehab , MEP Manager , CAPRIOLE CONSTRUCTION CO.

Actually one ton of refrigeration =12,000 BTU/hr. When it comes to relating this to air quantities, the basic equation is: Q (btu/hr) =1.08 (constant for air at standard conditions)*density correction factor*cfm*delta T 400 cfm per ton is a manufacturers nominal standard, or rule of thumb. It should get you in the ballpark, but is not exact.

Ammar Almnizel
by Ammar Almnizel , aircraft maintenence engineer , Royal Jordanian

each TR =400 CFM  thumb rule      200 Sq.ft =1 TR .....150 to200 Sq.ft =1TR 

zafarullah khan
by zafarullah khan , Site Electrical Engineer , Megger electro mechanical company

evrey is having there own formula regarding cfm calculation . which means no body knows exactly what cfm is and how it is calculated'

 

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