2.5.4.4 Turbomachinery It was assumed that 18% of this component could be made with lunar materials. Materials containing little non-lunar mass which might be suitable for colder and less stressed components are Croloy, stainless steel, and nickel alloys. 2.5.4.5 Recuperator/Cooler As mentioned earlier, none of the cycles need coolers. The use of recuperators for all of the Rankine cycles except the high temperature steam cycle is not possible since the necessary temperature potential does not exist in these cycles. It was assumed that 25% of the high temperature steam recuperator is non-lunar material.
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