Abstract
Normally, in the helium Refrigerator/liquefier, to avoid high expansion ratio through the turbines, two turbines are used with series hydraulic connection, so that intermediate pressure is about 6 bar, while the helium inlet pressure to the 1st warmer turbine is about 13.5 bar. Before passing through the 2nd turbine, this medium pressure stream is also further cooled to about 15 K from ∼27 K along with the hot high pressure helium stream of the same temperature range. 3-stream with counter-flow configuration type compact vacuum-brazed aluminium plate-fin heat exchanger is used for this purpose. Serrated type fins of thickness 0.2 mm have been used. Effects of fin parameters on the required size of the exchanger and pressure drop are analysed and considering manufacturing feasibilities, optimum parameters have been chosen. This paper will discuss details of these methods and results.
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