Hvac calculation

arun.p

Dear all
I am working in MEP field but no experience so I need your helps how find out an area cfm calculation and what is the ton of Ac given, what is the power how to find this calculation ..
BTU/HR - British Thermal Unit /Hr.

CFM - Cubic Feet per Minite

TMBH - ?

SMBH - ?

what is mean by TMBH and SMBH ?

russ_watters

Welcome to PF.

If you're working in the HVAC field, don't you have a more experienced engineer to mentor you? There is no other effective way to become an HVAC engineer. Anyway....

The capacity required (CFM at a certain temperature) is usually calculated using software for the internal and skin (walls, windows) load and fraction of fresh air and its temperature. Unless it is 100% outside air and a high volume (like for a lab), then it is just calculated using a psychrometric chart.

A ton of cooling is 12,000 BTU/hr

TMBH is total MBH (MBH is 1000 BTU/hr)
SMBH is sensible MBH (the part of the capacity related to temperature change, not condensation of water.