Question

10. (10pts) The surface area of an adult human being is 1,8 m2. Suppose a person with a skin tem omperature of 34°C is standing with bare skin in a room where the air is 22°C but the walls are 21°C. (ơ 5.67" 104 J / (sm"к"). There is a "dead ai lay ran around you next to your skin that acts as insulation. This dead-air layer is 5.0 mm thick. a) Draw b) What is the person's rate of heat loss by conduction? a picture to set up your solution and introduce all variables you will use. Air conductivity is 0.026 JI(s'm'K) c) What is the person's net radiation loss to the walls? The emissivity e of skin is 1.0 d) Does the conduction or radiation contribute more to the total rate of energy losS e) The person is metabolizing food at a rate of 200 W, does the person feel comfortable 3/5 chilly, or too warm? Explain.

Answer 1

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