What water basin temperature is required for full water flow over the cooling tower fill during cold weather operation?

The correct choice reflects the temperature needed for effective cooling tower operation during cold weather conditions. For a cooling tower to operate efficiently and promote full water flow over the fill, maintaining a water basin temperature around 27°C (81°F) is key.

At this temperature, the water is sufficiently warm to ensure that there is adequate thermal energy for evaporation, which is the primary cooling mechanism in cooling towers. When the water temperature is below this threshold, the effectiveness of the cooling process can diminish, as colder water does not evaporate as readily.

In colder weather conditions, a higher basin temperature helps to prevent issues such as freezing of the water or insufficient evaporation, both of which can lead to reduced performance of the cooling tower. Other temperature choices would not provide the optimum conditions for achieving the necessary heat exchange and maintaining system efficiency during cold weather, as they may either be too low to ensure adequate evaporation or may not align with typical operational standards for efficiency.