> A cryogenic cooling system usually just vents the gas into the room, it may just be a little well around the part which gets filled with ln2 from a dewar. It

> A cryogenic cooling system usually just vents the gas into the room, it may just be a little well around the part which gets filled with ln2 from a dewar. It depends on the scale, and whether the cooling is only required for a short while. Large scale cryogenics (such as at CERN, an LNG tanker etc) will recompress the vapor as it forms. If so, the loop basically IS as refrigerator, just a much bigger, higher performing unit. For an extreme example, see: https://home.cern/science/engineering/cryogenics-low-temperatures-high-performance https://home.cern/science/engineering/cryogenics-low-tempera...