Thermodynamics HW Solutions 963

Thermodynamics HW - Chapter 12 Radiation Heat Transfer Special Topic Heat Transfer from the Human Body 12-74C Yes roughly one-third of the

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Chapter 12 Radiation Heat Transfer Special Topic: Heat Transfer from the Human Body 12-74C Yes, roughly one-third of the metabolic heat generated by a person who is resting or doing light work is dissipated to the environment by convection, one-third by evaporation, and the remaining one-third by radiation. 12-75C Sensible heat is the energy associated with a temperature change. The sensible heat loss from a human body increases as ( a ) the skin temperature increases, ( b ) the environment temperature decreases, and ( c ) the air motion (and thus the convection heat transfer coefficient) increases. 12-76C Latent heat is the energy released as water vapor condenses on cold surfaces, or the energy absorbed from a warm surface as liquid water evaporates. The latent heat loss from a human body increases as ( a ) the skin wettedness increases and ( b ) the relative humidity of the environment decreases. The rate of evaporation from the body is related to the rate of latent heat loss by where h & & Qm h fg latent vapor = fg is the latent heat of vaporization of water at the skin temperature.
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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