What type of pressure is produced by a fan when air is in motion?

What type of pressure is produced by a fan when air is in motion?

• A. Static pressure
• B. Atmospheric pressure
• C. Dynamic pressure
• D. Velocity pressure

Answer: (D)

The type of pressure produced by a fan when air is in motion is dynamic pressure, which is associated with the airflow velocity through the fan. Dynamic pressure arises from the kinetic energy of the moving air, reflecting how fast the air is moving. It represents the portion of the total pressure of the air that is due to its motion. Dynamic pressure plays a significant role in various applications, particularly in HVAC systems where understanding airflow dynamics is crucial for effective heating, cooling, and ventilation. It is calculated using the formula where dynamic pressure equals one-half the density of the air multiplied by the square of its velocity. This relationship highlights the importance of both air density and velocity in determining the effective pressure created by a fan. Static pressure, in contrast, measures the pressure exerted by the air in a system when it is not in motion, while atmospheric pressure pertains to the weight of the air in the atmosphere exerted on a surface. Velocity pressure can also be considered, but it is often used in conjunction with static pressure and dynamic pressure to give a full picture of airflow characteristics in a system.

The type of pressure produced by a fan when air is in motion is dynamic pressure, which is associated with the airflow velocity through the fan. Dynamic pressure arises from the kinetic energy of the moving air, reflecting how fast the air is moving. It represents the portion of the total pressure of the air that is due to its motion.

Dynamic pressure plays a significant role in various applications, particularly in HVAC systems where understanding airflow dynamics is crucial for effective heating, cooling, and ventilation. It is calculated using the formula where dynamic pressure equals one-half the density of the air multiplied by the square of its velocity. This relationship highlights the importance of both air density and velocity in determining the effective pressure created by a fan.

Static pressure, in contrast, measures the pressure exerted by the air in a system when it is not in motion, while atmospheric pressure pertains to the weight of the air in the atmosphere exerted on a surface. Velocity pressure can also be considered, but it is often used in conjunction with static pressure and dynamic pressure to give a full picture of airflow characteristics in a system.