What is the standard cooling medium for an evaporative condenser?

• A. Only air
• B. Only water
• C. Air and water
• D. Steam

Answer: (C)

In an evaporative condenser, cooling relies on two media working together: water and air. Water circulates through the condenser to absorb heat from the refrigerant, forming a wetted surface. Air is then drawn across that wetted surface, causing part of the water to evaporate. The evaporation absorbs a large amount of heat (latent heat), and the moving air carries away the heat and water vapor. This combination—water for heat transfer and air for removing that heat via evaporation—is why the standard cooling medium is both air and water. Using only air would miss the latent cooling provided by evaporation, and using only water would not remove heat efficiently without the air moving across the surface. Steam isn’t involved in the cooling medium at all.