1.1. Mechanism of solar desiccant cooling system

The detail schematic diagram of this system is shown in Figure 1. This solar desiccant cooling system is composed of two air handling units with two desiccant modules and is operated in regeneration process and in dehumidification cooling process at the same time while the operation

mode is switched. Each air handling unit is composed of a primary desiccant module, a cooling coil, a secondary desiccant module, a fan and two damper boxes to control air flow. The well water

COOlmg coil

Cooling coil

Fig. 1. Schematic diagram of solar desiccant cooling system.

is assumed as cooling water for cooling coils without a refrigerator. The rain water and the cooling tower can be used to cool the heated air for the cooling coil. The air flow rate of 1000 CMH is supplied by the one of the fan.

In regeneration process, the primary desiccant module (silica-gel) is regenerated by the collected hot and dry air and the collected hot and dry air become the little hot and humid air. The little hot and humid air become the humid air by the cooling coil. The second desiccant module absorbs the moisture of the humid air and the air is exhausted to outdoor.

In dehumidification cooling process, the humid fresh air is dehumidified by the primary desiccant module and is cooled by the cooling coil and the secondary desiccant module. The evaporative cooling is used by the stored moisture of the secondary desiccant module in regeneration process. The dehumidified fresh air is supplied to indoor.