Reefer container

A reefer container configured to cool a gas inside a container body, comprising:

• the container body;
• a circulation line with a suction port and a blowout port each of which is disposed inside the container body;
• a compressor disposed in the circulation line and configured to compress the gas suctioned from inside the container body to the circulation line through the suction port;
• a heat exchanger disposed in the circulation line and configured to cool the gas compressed in the compressor;
• an expander disposed in the circulation line and configured to expand the gas cooled in the heat exchanger;
• and
• at least one separation device disposed in the circulation line and configured to separate some of components from the gas compressed in the compressor,
• wherein the at least one separation device includes an oxygen separator configured to separate oxygen from the gas compressed in the compressor, and
• wherein the reefer container further comprises:
• a buffer tank configured to store the oxygen separated from the gas in the oxygen separator;
• an oxygen recovery line for directing to the buffer tank the oxygen separated from the gas in the oxygen separator;
• and
• an oxygen return line for returning the oxygen stored in the buffer tank to inside the container body.