How To Calculate CFM In Airconditioning And What Is The Formula?


7 Answers

Monica Stott Profile
Monica Stott answered
First you need to be familiar with the data that you are working with. Once this has been done, you can then use the following steps and formula;

Get the number of feet in a meter taking into account that 2.54cm equals one inch. This means that one foot is 30.48 cm. What this means is that one foot equals 12x2.54 which gives you a sum of 30.48 cm. Taking into account that there are 100 cm in 1 meter, you will divide the 100by your previous answer of 30.48 = 3.28 feet for each meter.

You will then need to identify how many cubic feet make a cubic meter. Here you will need to convert from linear to volumetric. In order to do so, you will need to find the cube for the conversion factor 3.28^3 = 35.31. So you can conclude there are 35.31 cubic feet of each cubic meter.

From the above, you will need to determine the ratio in order to convert from cm to CFM. Basic knowledge tells us that we have 60 second in every minute. We use this with point number two where we found that there are 35.31 cubic in a meter, multiply the two figures by and you get approximately 2,119 cm. Meaning that there are 2,119 unit for every CMF in the Air conditioner.

You will then be required to convert the above figure to its equivalent. For example, if you have been given a rate of 10, you will multiply it by 2,119 = 21,190CMF.

The following above mentioned steps the basis of calculating the CMF in any given air conditioning system. It is a formula that has been used and continues to be used to determine the CMF. It may appear complex in the beginning but once you master it then it will be easy for you to work with the systems.

Alternatively, you could also covert the CMF to cm. It is just a matter of reciprocating the ratio given in point 4 by multiplying it by 0.0004719.
Anonymous Profile
Anonymous answered
Cfm means cubic feet for minit. Calculation of cfm : Total sft (area) x air changes / 60.

Kpsv prasada rao
Anonymous Profile
Anonymous answered
First of all CFM, in air conditioning is dependent of different type of loads :-
1) Equipment Load.
2) Lighting Load
3) Exposed Area like Windows , and Exposed roof.
4) Man Occupancy.

With all these data you derive the require dehumidified CFM.

Then you can apply 450 cfm per Tr is Required
Anonymous Profile
Anonymous answered
If I having a kitchen and my daily cooking 500 persons then how can I calculate cfm
Steven Vakula Profile
Steven Vakula answered
CFM is cubic feet per minute. To calculate this speed you need to know the size of the blower, the power of the blower motor, the air capacity, the size of the air ducts and the speed that the blower motor can operate.
Oddman Profile
Oddman answered
Without some understanding of the data you're working with, this question cannot be answered.

You get one formula if you're interested in air flowing in a duct of a given cross section. You get a different formula if you're interested in "rule of thumb" sizing a system for environmental control of a room or building of a particular square foot area or volume. Often, the "rule of thumb" will depend on what area of the world you are located in (that is, local climate conditions).

CFM is an abbreviation for cubic feet per minute. Somehow, you need to learn cubic feet and minutes, then perform the division.

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