Open cycle desiccant cooling system
Open cycle desiccant cooling system with energy storage
Open cycle desiccant cooling systems can remove ventilation cooling loads of buildings very efficiently. These loads amount often to more than 50 % of the total cooling load of a building. Outside air is dehumidified in an absorber by a concentrated hygroscopic salt solution and subsequently cooled in an air cooler to supply air temperature. The return air of the building is used in indirect evapoarative coolers to produce cooling water by evaporating water from wetted heat exchanger surfaces. The cooling water cools the supply air cooler and the absorber. The salt solution is diluted in the absorption process. In a regenerator the solution is re-concentrated by evaporating water at temperatures of 70 to 80 °C. The system of concentrated and diluted salt solution stores driving energy for this process very efficiently. The salt solution can be used as energy storage and transport medium. In winter the heat exchangers installed in absorber and evaporative coolers can be used as heat recovery system.