ISRO Scientist or Engineer Mechanical May 2017 Question 66

Question 66

A radiator on a space capsule must dissipate heat generated inside the capsule, by radiating it into space. While on the bright side of earth, the capsule sees the earth’s radiation and the solar radiation. The radiator surface has a solar absorptivity of 0.5 and an emissivity of 0.9. What is the maximum equilibrium surface temperature of the radiator, if the maximum heat generated in the capsule is 800 W/m$$^2$$? Assume earth’s radiation = 100 W/m$$^2$$ and solar irradiation = 524 W/m$$^2$$.
Take Stefan Boltzmann constant as $$5 \times 10^{-8} W/m^2-K^4$$

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