  We present a simple layout of a fast cooling system for liquids in sealed
containers utilizing the large temperature gradients of cold nitrogen gas. Our
system is optimized for about 20 cylindrical containers of 500 cm3 but the
setup allows for simple up- and downscaling as well as the use of arbitrary
containers. We have characterized the cooling performance of our system
experimentally for liquid temperatures in the range from room temperature down
to the freezing point at ~ -2 {\deg}C. With our system we achieve container
cooling times as low as 3 min, a significant reduction if compared to cooling
times with common methods in the range of 8 to 40 min. Modeling of the cooling
process proves that convection within the liquid is crucial for quick heat
transfer and that the most important factor limiting the cooling rate is the
thermal conductivity of the container material.
