A probe orbiting on Venus is modeled as a spherical spacecraft with radius 1m. The probe is
orbiting at the altitude h=1000km. Assume the spacecraft reaches thermal equilibrium and
the internal heat generated is 100W. The following parameters apply for Venus: solar
radiation intensity =2,620(W)/(m^(2)), planetary albedo =0.76, blackbody temperature =227deg K,
and view factor =0.45, mean planet radius =6051km. The two materials available for coatings
are white paint (alpha =0.15,epsi =0.9) and black paint (alpha =0.9,epsi =0.9). Select the material to have at
the equilibrium a temperature of 25deg C and if it is needed an active thermal control to have
the required temperature.
A probe orbiting on Venus is modeled as a spherical spacecraft with radius1 m. The probe is orbiting at the altitude h=1000 km. Assume the spacecraft reaches thermal equilibrium and the internal heat generated is 100 W. The following parameters apply for Venus: solar radiation intensity = 2,620 W/m2, planetary albedo = 0.76, blackbody temperature = 227 K, and view factor = 0.45, mean planet radius=6051 km. The two materials available for coatings are white paint (a=0.15,=0.9) and black paint (a=0.9,=0.9). Select the material to have at the equilibrium a temperature of 25C and if it is needed an active thermal control to have the required temperature.
