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 water flow into smaller droplets or thin films, thereby increasing the surface area available 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 reject heat from water to the atmosphere through evaporation and convection.
Step 2: Evaluate the role of the 'fill' (packing material). The fill provides a large surface area for the water to spread over as it falls by gravity.
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 is a result of the process, but the fill's primary function is not to decrease it (in fact, humidity increases as water evaporates).
Step 4: Conclude that by increasing the contact area and time between the descending water and ascending air, the fill maximizes the efficiency of the heat exchange process.