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. Potassium Rankine High Temperature Cycle: Total Mass-12.96xlOE6 Kg Non-Lunar Mass-10.62xlOE6 Kg Potassium Rankine Low Temperature Cycle: Total Mass-18.72xlOE6 Kg Non-Lunar Mass-15.3xlOE6 Kg Steam Rankine High Temperature Cycle: Total Mass-11.88xlOE6 Kg Mon-Lunar Mass-9.72xlOE6 Kg Steam Rankine Low Temperature Cycle: Total Mass-14.31xlOE6 Kg Non-Lunar Mass-11.7xlOE6 Kg 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. Steam Rankine High Temperature Cycle: Total Mass-0.99xlOE6 Kg Non-Lunar Mass-0.25xl0E6 Kg
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