Liquid nitrogen tank is an ideal device for short-term cryogenic refrigeration because of its simple operation, small size, and low cost. The container is a cylindrical container with its outer wall and inner wall being evacuated and filled with thermal insulation material to isolate the heat exchange.
After pouring liquid nitrogen into the tank, the upper space in the tank is filled with low-temperature nitrogen. Although there is still a certain amount of heat exchange between the liquid nitrogen tank and the external environment after closing the tank opening.
Therefore, liquid nitrogen refrigeration is more suitable for some items that require short-term rapid cooling preservation.