What is the difference between 'static pressure' and 'dynamic pressure' in ventilation systems?

The distinction between static pressure and dynamic pressure is fundamental in understanding how ventilation systems operate. Static pressure is the pressure exerted by a fluid (in this case, air) at rest within the ductwork. It is a measure of potential energy in the air when it's not moving, essentially reflecting how much force the air exerts on the walls of the ducts due to its weight. This pressure is essential for maintaining airflow within the system as it allows the air to be distributed evenly without causing turbulence.

Dynamic pressure, on the other hand, is related to the energy of moving air. It describes the pressure associated with the kinetic energy of a fluid in motion. In ventilation systems, dynamic pressure occurs when the air is in motion through the ducts. It reflects the velocity of the airflow and contributes to the overall pressure that drives the air throughout the system.

Understanding the interplay between these two types of pressure helps in optimizing ventilation design and performance, ensuring efficient air distribution and effective management of indoor air quality.