The amount of heat radiated by the body depends on its surface temperature and a

Question

The amount of heat radiated by the body depends on its surface temperature and area. Typically, this temperature is about 30%u2218C (although it can vary). The surface area depends on the person%u2019s height and weight. An empirical formula for the surface area of a person%u2019s body is

A (in m2) = (0.202)M0.425h0.725,

where M is the person%u2019s mass (in kilograms) and his his or her height (in meters).

What would be the surface area of a 174lb (79kg ), 6.14ft (1.87m) person?

A=___________

How much heat would the person radiate away per second at a skin temperature of 30%u2218C? (At the low temperatures of room-temperature objects, nearly all the heat radiated is infrared radiation, for which the emissivity is essentially 1, regardless of the amount of skin pigment.)

H=___________

How much net heat would radiation remove from the person%u2019s body if the air temperature is 20%u2218C?

H=_____________

Explanation / Answer

3. net heat inflow = H = 973.37 - 5.67*10^(-8)*(273+20)^4*2.0367 = 86.26 watt

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