How do you determine how many raw deep coil is required in an AHU?

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The raw deep coil requirement for an air handling unit (AHU) is determined based on several factors, including the desired cooling capacity, the entering air temperature and humidity, and the required leaving air temperature and humidity.

Here are the steps to determine the raw deep coil requirement for an AHU:

1.     Determine the cooling capacity: The cooling capacity of the AHU is the amount of heat that needs to be removed from the air. It is usually expressed in units of tons of refrigeration (TR) or in watts (W). The cooling capacity can be calculated based on the desired temperature and humidity conditions of the entering and leaving air.

2.     Select the refrigerant: The type of refrigerant that will be used in the AHU is an important factor in determining the raw deep coil requirement. Different refrigerants have different thermodynamic properties, which can affect the performance of the coil.

3.     Calculate the surface area of the coil: The surface area of the coil is a key factor in determining the raw deep coil requirement. The larger the surface area, the more heat can be absorbed from the air. The surface area can be calculated based on the desired cooling capacity and the properties of the refrigerant.

4.     Determine the fin spacing: The fin spacing of the coil affects its performance by determining the rate at which air can pass over the coil. The fin spacing should be selected based on the desired air flow rate, the refrigerant properties, and the size and type of fan used in the AHU.

5.     Choose the tube size: The tube size of the coil affects the amount of refrigerant that can flow through it, which in turn affects the cooling capacity of the coil. The tube size should be selected based on the desired cooling capacity, the refrigerant properties, and the available space in the AHU.

6.     Select the type of coil: There are several types of coils that can be used in an AHU, including finned tube coils, plate and frame coils, and tube-in-tube coils. The type of coil selected will depend on the desired cooling capacity, the available space in the AHU, and the cost and maintenance requirements of the different types of coils.

In conclusion, determining the raw deep coil requirement for an AHU requires a detailed analysis of the desired cooling capacity and the design parameters of the AHU. It is best to consult with a HVAC engineer or a refrigeration specialist to ensure that the right raw deep coil is selected for the application.

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