Conclusions The terrestrially derived mass of the radiator for a 10 MWth power plant can be kept to between 2100-4100 kg thus giving a total power plant mass of between 32 500-34 500 kg. This compares favorably to all terrestrial sourced radiators which weigh in at about 20 000 kg. The use of a two phase system allows better heat transfer and thus a turbine outlet temperature some 7% lower which in turn increases the electrical output from 3.36 MWe to 3.5 MWe. The combined effect of the mass reduction and energy efficiency have raised the specific power of the plant to approximately 100 W/kg (101.5-107.5). This significant improvement gives important benefits to any large-scale user of electricity e.g. use of such a power plant would reduce the mass of a 1000 ton/yr oxygen facility to 68.6 tons from 104.6 tons. The development of a waste heat radiator of this design has a significant effect on all base designs. It significantly alters tradeoffs involving power systems and users and
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