Three-step Liquid Desiccant Air Conditioning System Driven by Gas and Its Characteristic Analysis

Liquid desiccant air conditioning systems (LDAS) are being studied as an alternative to conventional vapor compression refrigeration systems due to their energy conservation and environmental protection. The principle and characteristic of LDAS have been presented in this paper. A three-step LDAS is put forward based on the idea of stepping dehumidification and the principle of energy step utilization. This system driven by gas consists of fan, dehumidifier, evaporative cooler and regenerator. The dehumidifier uses the liquid desiccant to remove the water vapor of supply air by three steps. In every step there is a direct evaporative cooler to cool the course of dehumidification. The evaporative cooler is a combination of indirect and direct evaporative cooling, which is used to decrease the dry-bulb temperature of the dry air after dehumidification. The regenerator driven by gas makes the weak desiccant coming from the dehumidifier to renew by boiling and non-boiling evaporation. It is set forth that the characteristics in the way of saving-energy and improving IAQ about this system.

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