section_path: Methods of refrigeration/Cyclic refrigeration/Sorption cycle/Adsorption cycle
section_name: Adsorption cycle
paragraph_text: Adsorption cycle
  
  The main difference with absorption cycle, is that in adsorption cycle, the refrigerant (adsorbate) could be ammonia, water, methanol, etc., while the adsorbent is a solid, such as silica gel, activated carbon, or zeolite, unlike in the absorption cycle where absorbent is liquid.
  
  The reason adsorption refrigeration technology has been extensively researched in recent 30 years lies in that the operation of an adsorption refrigeration system is often noiseless, non-corrosive and environment friendly.