Abstract: In an absorption refrigeration unit wherein a stream of relatively low temperature heating fluid such as solar heated water is used as the heat source for the vapor generator, the weak absorbent solution is preheated to almost its boiling temperature just before entering the generator by passing at relatively high velocity in heat exchange relationship with the stream of heating water leaving the generator. This arrangement makes it possible to have a relatively low heat transfer area in the generator while operating with heating water at a lower temperature than would otherwise be necessary.

Abstract: Solutions containing lower aliphatic alcohols, the halides of lithium, calcium, strontium and barium and water are used as absorbent-refrigerant compositions in absorption refrigeration systems.