<Tr> <Td> Cryogenic refrigeration </Td> <Td> </Td> <Td> Ethylene, Propane, Nitrogen, Helium </Td> </Tr> <Ul> <Li> Very mature technology . </Li> <Li> Relatively inexpensive . </Li> <Li> Can be driven directly using mechanical energy (water, car / truck motor) or with electrical energy . </Li> <Li> Efficient up to 60% of Carnot's theoretical limit (as evaluated in ASHRAE testing conditions: evaporation temperature of − 23.3 ° C, condensing temperature of 54.4 ° C, and ambient temperature of 32 ° C) based on some of the best commercially available compressors, as produced by manufacturers Danfoss, Matsushita, Copeland, Embraco, Bristol and Tecumseh . However, many refrigeration systems use compressors that have lower efficiencies of between 40--55%, since the 60% efficient ones cost almost twice as much as the lower efficiency ones . </Li> </Ul> <Li> Very mature technology . </Li> <Li> Relatively inexpensive . </Li>

Advantage and disadvantage of vapour compression refrigeration system