Certified Water Technologist (CWT) Practice Exam

Scaling in a cooling tower system is a result of the precipitation of minerals and deposits from the water used in the system, which can accumulate on heat exchange surfaces. This accumulation primarily interferes with the heat transfer process, leading to a reduction in the efficiency with which heat is dissipated. The presence of scale creates an insulating layer that prevents effective thermal conduction between the water and the surfaces of the heat exchangers. Consequently, less heat is absorbed or released, which diminishes the overall cooling effectiveness of the system.

This adverse impact on heat transfer efficiency is a significant concern in maintaining optimal cooling tower operations, as it can lead to increased energy consumption and a need for more frequent maintenance to address the scaling issues. The other options do not accurately describe the effects of scaling. For instance, scaling generally leads to increased water requirements for blowdown and maintenance rather than reducing them, and it typically does not improve flow rates; instead, it often causes blockages and flow restrictions.