Question

1. Consider a 60kg person. The forehead is well known to be a body location that indicates the internal body temperature. For this person, the forehead is at the internal body temperature of 38.3°C, and the tip of nose remains at the room temperature of 25°C. Given that the emissivity of the body is 0.8, how many times more is the radiative intensity (Wm^-2) of the forehead compared to the nose?
2. What is the net radiative intensity (in Wm^-2) of the forehead?
3. The metabolic energy generated in the person is 3.1´10⁶ J in a 6 hour period, and this is balanced by cooling of the body by 2.6 L of perspiration and radiative cooling (you can neglect conductive and convection cooling). What is the effective surface area of the person?

Answer 1