6.Hl6 As described in section VI.8.5, a complete evaluation of these tradeoffs includes consideration of system options--the 523% increase in electrical power requirement may not be difficult to provide, depending on the generating system used--and the issues of heat pump maintenance and repair, radiator tolerance and safety. The graphed quantities behave in similar fashion for values of T 4 within its envelope. The radiator mass dips as low as 5.35xl0 5 kg when T 4 = 180°K and T 2 = 600°K. However, Pthermal = l.lxl0 8 watts and;= 607 kg/sec for that case.
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