Which type of pressure is primarily influenced by the speed of the airflow?

The correct answer is C, which refers to velocity pressure. Velocity pressure is directly related to the speed of the airflow within a duct or system and is a measure of the kinetic energy of the moving air. It describes the pressure exerted by the airflow as it moves through a space, and it can be calculated using the velocity of the air and the density of the air.

In airflow dynamics, velocity pressure is significant because it helps determine how well air will carry heat or react with other components of an HVAC system. An increase in the speed of the airflow results in an increase in velocity pressure. Understanding this relationship is crucial for optimizing system performance, ensuring effective air distribution, and maintaining comfortable indoor environments.

Static pressure, in contrast, is the pressure exerted by the air when it’s at rest and does not directly account for airflow speed. Dynamic pressure is a broader term that refers to the pressure of moving fluids and includes both velocity pressure and static pressure. Metering pressure generally refers to a specific application of pressure measurement and is not focused primarily on the speed of airflow.