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- Consider a 260-m2 black roof on a night when the roof’s temperature is 27.5°C and the surrounding temperature is 12.5°C. The emissivity of the roof is 0.900. At what net rate does heat radiate, in kilowatts, from the roof?A person is standing outdoors in the shade where the temperature is 33 °C. The surface area of the hair (assumed to be flat) is 170 cm2 and its emissivity is 0.85. What would be the radiant energy absorbed per second by the same person if he were bald and the emissivity of his head were 0.65?Suppose a skier standing in the shade is completely clothed in white (head to foot, including a ski mask), with clothes that have an emissivity of 0.200 and a surface temperature of 9.5°C. The surroundings are at -15.5°C and her surface area is 1.35 m2. find the net rate of heat transfer in watts via radition from the skier. Q/change in t=