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The process of cooling circulating condenser water by evaporating tower water is best described as "evaporative cooling." In this context, evaporative cooling refers to the mechanism by which heat is removed from the circulating water due to the molecular evaporation of water in the cooling tower. As water evaporates, it absorbs heat from the remaining water, resulting in lower temperatures of the water that circulates through the system.

This process is essential in various HVAC systems and industrial applications where effective heat rejection is necessary to maintain efficient operating conditions. Evaporative cooling is particularly effective because it provides a way to cool a liquid by removing heat through the phase change of water, which requires significant energy.

Other options like adiabatic cooling describe processes where heat transfer occurs without heat loss, heat exchange is a more general term for any transfer of heat between systems, and isothermal cooling refers to processes that occur at a constant temperature, which does not specifically capture the evaporative aspect of this cooling mechanism. Thus, the term that accurately captures the essence of this cooling process is evaporative cooling.