Theoretical analysis of coil finned tube type heat exchanger for helium liquefaction plant

The cryogenic heat exchanger governs the performance of cryogenic system. The present work reports the theoretical analysis of heat transfer process of coil finned tube heat exchanger used in Collins cycle based medium capacity helium liquefier. The aim of present study is to design and optimize different geometrical and operating parameters for coiled finned tube exchangers. To improve the effectiveness of heat exchanger the theoretical analysis has been carried out by theoretical modelling. The efforts have been made to study the effect of different geometrical parameters like coil diameter, tube diameter by in depth study of DIN number, fin height and fin spacing etc. and operating parameters like pressure drop. The design and optimization of geometrical and operating parameters are done to achieve the desired temperature drop of cold fluid. The variation in properties of helium for specified temperature range are studied and taken into consideration.