Experience over the last four years with a fairly large helium liquéfier led to the belief that it would be possible to reduce the cost per liter of liquefying helium and hydrogen to a figure only slightly greater than the cost of liquefying air, A heavy-duty machine which would run for years with only nominal maintenance charges would be required. High efficiency in the use of manpower and electrical energy would also be necessary.
KeywordsHeat Exchanger Liquid Helium Liquid Hydrogen Engine Cylinder Expansion Valve
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