Patent ID: 7762099

Claim:
A refrigeration apparatus comprising a refrigerant circuit in which a refrigeration cycle is performed by circulation of refrigerant therethrough and a fluid machine connected to the refrigerant circuit, the fluid machine including an expander, a compressor, and a rotation shaft for coupling together the expander and the compressor; wherein a plurality of the fluid machines are connected to the refrigerant circuit; wherein the expanders of the fluid machines are mutually connected in parallel; and wherein the compressors of the fluid machines are also mutually connected in parallel, wherein, where the suction volume of refrigerant drawn into the compressor per one rotation of the rotation shaft of each of the plurality of the fluid machines is expressed by Vc and the inflow volume of refrigerant flowing into the expander per one rotation of the rotation shaft of each of the plurality of the fluid machines is expressed by Ve, the plurality of the fluid machines are configured such that they differ from each other in the volume ratio, Vc/Ve, of the suction volume Vc to the inflow volume Ve.