What term describes the movement of air in a duct system?

The movement of air in a duct system is best described by the term "dynamic flow." This term refers to the movement of air under the influence of pressure differences created by fans or other mechanical systems. Dynamic flow involves the active transport of air and is crucial for understanding how air is distributed throughout a space via ductwork.

In a duct system, the dynamics of air movement can be influenced by factors such as the speed of airflow, changes in pressure, and the design of the ductwork itself. This contrasts with static flow, which refers to situations where air is not moving or is at rest. Laminar flow refers to smooth, orderly air movement characterized by parallel layers with minimal disruption, and turbulent flow describes chaotic air movement with eddies and swirls. While both laminar and turbulent flow can occur in a duct system, the term that encompasses the general state of active air movement, including various flow types and conditions, is dynamic flow. Understanding dynamic flow is essential for effective HVAC design and operation, impacting energy efficiency and comfort in built environments.