Abstract
The authors examine a coil heat exchanger of the throttle stage of cryogenic helium plants made of tubes with wire fins. The coil heat exchanger represents a bundle of tubes with wire fins encased in a shell and is shown. This heat exchanger design offers a pure countercurrent flow to achieve small temperature differences. The coefficient of hydraulic resistance was investigated under isothermal conditions. The geometrical parameters of the experimental coil heat exchangers with different finning parameters, the composition of the bundle, and the diameter of the coil are given. The investigated designs of coil heat exchangers are being used in the throttle stage of cryogenic helium plants with low and medium refrigerating capacities and as supercoolers in air fractionation units with low refrigerating capacities. Their applications may be expanded to microcryogenic technology.
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