OverviewHistoryPhotovoltaic (PV) solar coolingGeothermal coolingSolar open-loop air conditioning using desiccantsPassive solar coolingSolar closed-loop absorption coolingSolar cooling systems utilizing concentrating collectors
In the late 19th century, the most common fluid for absorption cooling was a solution of ammonia and water. Today, the combination of lithium bromide and water is also in common use. One end of the system of expansion/condensation pipes is heated, and the other end gets cold enough to make ice. Originally, natural gas was used as a heat source in the late 19th century. Today, propane is used in recreational vehicle absorption chiller refrigerators. Hot water solar thermal e