How to calculate capacity of an AHu or Air Handling Unit?

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Calculating the capacity of an air handling unit (AHU) involves determining the amount of air that needs to be moved and the resistance to flow that exists in the system. Here is a step-by-step process to calculate the capacity of an AHU:

1.     Determine the volume of air that needs to be moved: This is typically expressed in cubic feet per minute (CFM) and is based on the size of the space being conditioned, the number of occupants, and the type of use (e.g. office, laboratory, manufacturing).

2.     Calculate the system's resistance to flow: This involves determining the resistance of the filters, ducts, diffusers, and other components in the system. This resistance is expressed in inches of water column (in. w.c.).

3.     Determine the fan laws: The fan laws are mathematical relationships that describe how changes in fan speed, airflow, and power consumption are related. These relationships can be used to calculate the capacity of the AHU.

4.     Calculate the required fan power: The required fan power can be calculated using the fan laws and the resistance to flow, as well as the desired volume of air flow. This will give you the required horsepower or kilowatt rating of the fan.

5.     Select the fan: Based on the calculated fan power, you can select a fan that is capable of meeting the requirements of the system. This may involve evaluating different fan types (e.g. centrifugal, axial, etc.), fan sizes, and fan speeds to determine the best fit for the application.

6.     Confirm the results: Once the fan has been selected, it's a good idea to perform a verification of the system's performance using a test and balance process. This involves measuring the actual airflow, pressure, and power consumption of the fan and comparing it to the calculated results.

This is a general process for calculating the capacity of an AHU. The specific details of the calculation will vary depending on the type of AHU, the design requirements, and the specific components in the system.

 

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