Liquid Spray Tower

Liquid desiccant systems operate on the principle of chemical absorption of water vapor from air. A representative liquid system featuring LiCl solution is shown schematically in Figure 39-5. In this system, air to be conditioned is cooled and dehumidified by contacting the desiccant (absorbent) solution in the conditioner. Heat extracted from the air by the desiccant solution is transferred to the coolant by continuously recirculating the solution through a heat exchanger. Coolant flow through the heat exchanger is modulated to control the amount of heat and moisture extracted from the air.

Figure 39-6 shows a small packaged LiCl liquid system with a conditioner airflow capability of up to 3,000 cfm (85 m3/m). To remove the water extracted from the

Fig. 39-5 Schematic Diagram of Liquid System. Source: Kathabar Systems

air and keep the desiccant solution at a fixed concentration, a small amount of solution is transferred from the conditioner to the regenerator. Heated desiccant solution contacts a scavenger airstream and is concentrated by evaporation of water from the solution to the air. Heat flow to the heat exchanger is modulated to match the moisture load in the conditioner. The amount of moisture

Fig. 39-6 Small Packaged LiCl Liquid System. Source: Kathabar Systems

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