Modern indirect evaporative cooling systems provide extraordinary efficiency but are limited by the air moisture content, and their use is thus limited to dry climates. When humidity rises, the evaporative cooling system performance degrades. Applying desiccant-based dehumidification to evaporative coolers allows the system to operate efficiently even under humid conditions.
Air dehumidification in the Evapair system is achieved by sorption water vapor from the air by a solid desiccant (silica gel). The silica gel adsorbs the moisture, the water molecules adhere to the surface of the silica gel. As the rotor turns, the desiccant passes alternately through one air stream – where the moisture is adsorbed – and then through another air stream, where the hot air regenerates the desiccant.
Field tests show no bacteria formation on the rotor. In case the rotor is used in applications with contaminated air, it can be washed.
The users of Evapair evaporative air handler with dehumidification system developed by Kaltra can benefit from its ability to operate efficiently in high-humidity, high-temperature applications.