HVAC Calculation: Learn About CFM, BTU/HR, TMBH & SMBH

In summary, the conversation is about finding the necessary calculations for CFM and ton of AC in the MEP field. The speaker also asks for clarification on the meaning of TMBH and SMBH in this context. They also mention the importance of having a more experienced mentor in the HVAC field.
  • #1
arun.p
1
0
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 ?
 
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  • #2
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.
 

1. What is the purpose of HVAC calculation?

HVAC calculation is used to determine the necessary heating and cooling requirements for a particular space. This ensures that the HVAC system is properly sized and can effectively maintain a comfortable indoor temperature.

2. What does CFM stand for in HVAC calculation?

CFM stands for cubic feet per minute and is a unit of measurement used to determine the airflow rate of an HVAC system. It is important to calculate the CFM in order to properly size and design the system.

3. How is BTU/HR used in HVAC calculation?

BTU/HR, or British Thermal Units per hour, is used to measure the amount of heat energy needed to raise the temperature of one pound of water by one degree Fahrenheit. In HVAC calculation, it is used to determine the heating or cooling capacity needed for a space.

4. What is TMBH and SMBH in HVAC calculation?

TMBH stands for Total Measured Building Height and SMBH stands for the Static Maximum Building Height. These measurements are used in HVAC calculation to determine the total volume of the space, which is important in calculating the necessary CFM and BTU/HR.

5. How often should HVAC calculation be done?

HVAC calculation should be done whenever a new system is being installed or when significant changes are made to the building, such as renovations or additions. It is also recommended to re-calculate every few years to ensure that the system is still properly sized and functioning efficiently.

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