Adsorption chillers are considered to be one such technology; however, their main disadvantages include a low cooling capacity, a low energy efficiency ratio (EER), and cyclic operation. Thus, a great deal of effort is being put into improving adsorption-chiller performance.

The main difference between adsorption chillers and absorption chillers is during the adsorption method the water is adsorbed onto a solid (the non-hazardous or corrosive silica gel) and in the absorption method the water is dissolved into a liquid (the corrosive lithium bromide).

Single effect absorption chiller refers to chillers that have only one generator chamber. In contrast, the double effect absorption chiller concentrates its adsorbent solution in two stages. Once in a high-temperature generator and once in a low-temperature generator.

Absorption chiller makes chilled water through the 4 cycles of ¡°evaporation,¡± ¡°absorption,¡± ¡°generation,¡± and ¡°condensation.¡± This is eco-friendly air conditioning system that uses water as refrigerant, without using Freon Gas (CFC, HCFC) which might be a cause of Global Warming or Ozone Depletion.