Since the silica gel–water adsorption chiller can be driven by low-grade heat source with a temperature lower than 90 °C, it is attractive to be used in a solar cooling system. For a solar cooling system, which adopts silica gel–water adsorption chiller, the most commonly used solar collectors are flat plate collector and evacuated tube collector. When the heat source temperature ranges from 45 to 95 °C, flat plate solar collectors can be used (Varga et al., 2005). Zhai et al. (2007) have concluded that a silica gel–water adsorption chiller can be operated more than 8 h daily for continuous air conditioning when powered with solar water heating, the thermal COP could be as high as 0.3 when 60 °C hot water is used for generation.