Refrigeration Plant Operator B Practice Test

How do terminal air distribution devices accomplish their functions?

1. Only by diffusion

2. Only by aspiration

3. By aspiration, entrainment, induction, and diffusion

4. Only by induction

The correct answer is: By aspiration, entrainment, induction, and diffusion

Terminal air distribution devices play a critical role in effective ventilation and climate control within a space. They achieve their functions through a variety of mechanisms, specifically aspiration, entrainment, induction, and diffusion. Aspiration involves drawing in surrounding air into the flow created by the terminal device, which enhances the mixing of the supplied conditioned air with the air already present in the environment. This is essential for maintaining uniform temperature and air quality throughout the space. Entrainment refers to the ability of the device to pull in additional surrounding air as it distributes the conditioned air. This process helps maintain the overall airflow dynamics, ensuring that air reaches various parts of the room effectively. Induction is the mechanism whereby the movement of the primary air stream from the device helps to induce or draw in air from the surrounding environment. This process aids in the circulation of air and can increase the efficiency of the system by promoting better mixing. Lastly, diffusion is the process of spreading the air over a larger area, allowing for gentle release of conditioned air into the space. This helps in achieving a more comfortable environment without creating drafts. Combining these methods allows terminal air distribution devices to effectively control temperature, improve air quality, and ensure comfort in space by promoting thorough air circulation and mixing, which is