How Does The Reheat Coil in AHU Work?

How does the reheat coil in AHU work?

The reheat coil in an AHU works in the following way:

When there is a need to increase the temperature of the already processed air, a heated medium (such as hot water, steam, or an electric current) is passed through the reheat coil. As the air flows over the coil, heat is transferred from the coil to the air, raising its temperature. The amount of heat added can be controlled by regulating the flow of the heated medium or by varying other parameters.

For example, let's say the air coming out of the cooling section of the AHU is too cold for a particular zone. The reheat coil is activated, and hot water is circulated through it. The air then passes over the now-hot coil and absorbs the heat, becoming warmer before being supplied to that specific zone. This allows for fine-tuning of the air temperature to meet specific comfort or process requirements. The operation of the reheat coil is integral to achieving the desired temperature control and maintaining a balanced and comfortable environment within the AHU's service area.