Abstract: A liquid carbon dioxide refrigeration system is provided. The refrigeration system may include a storage tank arranged for storing liquid carbon dioxide, and a vessel arranged to separate carbon dioxide into a vapor carbon dioxide portion and a liquid carbon dioxide portion. A first conduit is coupled to the storage tank and the first vessel such that liquid carbon dioxide can pass from the storage tank to the first vessel. A second conduit is coupled to the first vessel such that the liquid carbon dioxide portion can pass into a refrigeration device, and a third conduit is coupled to the first vessel and the first conduit to recycle the vapor carbon dioxide portion back to the first conduit.

Abstract: Method and apparatus for moving liquid cryogen at relatively low pressures and at high volumes. An axial rotor pump may have housing with a substantially vertical tubular space. The axial rotor pump may pump liquid cryogen from an inlet near a bottom of the housing to an outlet near a top of the housing. A seal may not be required between a pump drive shaft and the top of the pump housing by using an extended neck or a magnetic coupling arrangement.