During the operation of a forced draft cooling tower, which of these statements is NOT true?

In the context of forced draft cooling towers, the accurate statement is that vibration and noise are typically not at a maximum during normal operations. Forced draft cooling towers utilize fans to blow air into the tower, which can create some vibration and noise; however, this is usually managed and kept within acceptable limits, especially when compared to other types of cooling towers or systems that may generate higher levels of vibration or noise.

The other statements reflect accurate aspects of the operation of forced draft cooling towers. The drift eliminators are designed to remove water droplets that may become entrained in the airflow, thus preventing them from escaping with the exhaust air and ensuring water conservation. Additionally, the fans in these systems predominantly handle air that is more or less in a dry state, since the purpose of the cooling tower is to evaporate water and thus reduce humidity in the recirculated air. Finally, the design of forced draft cooling towers allows fans to effectively force air through the packing at relatively low velocities to maximize contact time between the air and the water for optimal cooling efficiency.

Understanding this operation is essential for efficient cooling tower design and operation, as well as for troubleshooting potential issues such as excessive noise or vibration that may indicate mechanical problems or require maintenance attention.