Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.5, and surface temperature is 32°C. Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of 300 K.
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- If the body’s surface temperature is 35 degrees Celsius, what is the net rate of heat loss on a chilly 4 degrees Celsius day. All human skin is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.97.One half of a kilogram of liquid water at 273 K (0°C) is placed outside on a day when the temperature is 259 K (-14 °C). Assume that the heat is lost from the water only by means of radiation and that the emissivity of the radiating surface is 0.560. Consider two cases: when the surface area of the water is (a) 0.035 m² (as it might be in a cup) and (b) 1.5 m² (as it could be if the water were spilled out to form a thin sheet). For each case, (a) and (b), determine the time it takes the water to freeze into ice at 0 °C. (a) Number (b) Number i Units UnitsConsider 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?
- 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=Suppose you walk into a sauna that has an ambient temperature of 52.0°C. (a) Calculate the rate of heat transfer in watts to you by radiation given your skin temperature is 37.0°C, the emissivity of skin is 0.98, and the surface area of your body is 1.40 m2. W (b) If all other forms of heat transfer are balanced (the net transfer is zero), at what rate will your body temperature increase in degrees Celsius per minute if your mass is 70 kg? °C/minSuppose you walk into a sauna that has an ambient temperature of 50.0C. (a) Calculate the rate of heat transfer to you by radiation given your skin temperature is 37.0C, the emissivity of skin is 0.98, and the surface area of your body is 1.50 m2. (b) If all other forms of heat transfer are balanced (the net heat transfer is zero), at what rate will your body temperature increase if your mass is 75.0 kg?