What is the primary function of the fill in a cooling tower?
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What is the primary function of the fill in a cooling tower?
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Answer: C. Maximize water and air contact
The fill in a cooling tower is designed to break the falling water into smaller droplets or spread it into thin films, thereby increasing the surface area for heat and mass transfer between the water and the air.
Step-by-step Derivation:
Step 1: Analyze the objective of a cooling tower, which is to remove heat from water by evaporating a small portion of it into the air (evaporative cooling).
Step 2: Evaluate the role of the 'fill' (the internal structure). The fill provides a large surface area for the water to cling to as it descends.
Step 3: Compare the options:
- Option A: Air speed is controlled by fans, not the fill.
- Option B: The goal is to decrease water temperature, not increase it.
- Option D: Humidity increases as water evaporates; the fill does not decrease it.
Step 4: Conclude that by increasing the contact area and time between the air and water, the fill maximizes the efficiency of the heat exchange process.