6. Hll and Poutputrad comes from As mentioned in VI.8.4, the external radiator does not operate at one temperature throughout. Here again, the equivalent radiator temperature is and the Stefan-Boltzmann Law gives P outputrad ( £ ) (o) (Trad) 4. The mass of the radiator depends on the material used. If T 2 is below 644°K (see Appendix VI.G), aluminum is suitable, and If T 2 is above 644°K, a steel radiator is needed: VI.H.4: CONSTRAINTS ON THE PARAMETERS There are physical restrictions on the cycle temperatures. T 1 is fixed at 295°K for human survival reasons. T 4 has a lower limit of 90°K; below this the oxygen in the air liquefies, lessening the turbine work output. T 4 also has upper limit 295°K, since the
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