What is the main cooling method employed by an air washer system?

The primary cooling method used by an air washer system involves water and air exchange. This process cools the air by using the principle of evaporative cooling, where warm air is passed over water-saturated surfaces, allowing the water to evaporate and absorb heat from the air, resulting in a reduction of air temperature.

In contrasting choices, evaporation of refrigerant and direct expansion are methods typically associated with refrigeration systems rather than air washers. Chilled water circulation involves using chilled water to reduce air temperature but is more aligned with chilled water systems or cooling coils. In an air washer, the effectiveness of cooling is predominantly reliant upon the interaction between water and air, making it essential for this process to be highlighted correctly in relation to air washers.