Haihdutusjäähdytyksessä

Haihdutusjäähdytys, known in English as evaporative cooling, is a process that cools air through the evaporation of water. This natural phenomenon is harnessed in various cooling systems, particularly in arid and semi-arid climates where the air's capacity to absorb moisture is high. The principle behind hahdutusjäähdytys relies on the fact that when water evaporates, it absorbs heat from its surroundings, thereby lowering the temperature of the air.

In a typical direct evaporative cooling system, warm, dry air is passed through a water-saturated medium, such as a porous pad or a series of wetted filters. As the air flows through the medium, water evaporates from the surface, drawing heat from the air and cooling it. The now cooler, more humid air is then circulated into the space to be cooled. Indirect evaporative cooling systems achieve a similar outcome but use a heat exchanger to separate the cooling air stream from the water. This method cools the air without adding significant moisture to it, which can be advantageous in environments where humidity control is also a concern.

Haihdutusjäähdytys is an energy-efficient alternative to traditional refrigeration-based air conditioning, as it typically uses less electricity and does not require refrigerants. Its effectiveness is directly influenced by the ambient humidity; the drier the air, the more efficient the cooling process. While it can significantly reduce temperatures, it typically does not achieve the same low temperatures as mechanical cooling. Common applications include residential cooling, industrial processes, and ventilation systems in buildings.