Closed loop refrigeration system

A closed loop refrigeration system comprising a gas hydrate formation device, an object to be cooled, a separator, a compressor, a cooler and a decompressor,

• the system having:
• a first circulation loop extending through the gas hydrate formation device, the object to be cooled and the separator and back to the gas hydrate formation device and comprising a gas hydrate line for transporting a gas hydrate having a temperature below 0° C.;
• and
• a second circulation loop for gas extending through the gas hydrate formation device, the compressor, the cooler and the decompressor and back to the gas hydrate formation device,
• wherein the first circulation loop has the gas hydrate line, a mixed phase line for transporting a mixed phase of gas and ice after decomposition of the gas hydrate, and an ice line for transporting ice after the ice is separated from gas by the separator, and an object to be transported in each line of the first circulation loop is transported together with a same liquid carrier, and
• wherein the second circulation loop has a first gas feed line branched between the gas hydrate formation device and the compressor for sending gas to the gas hydrate formation device from the second circulation loop, and a second gas feed line connected for sending the gas separated by the separator to the compressor.