You need to estimate how much energy generated by metabolism is needed to keep a person
naked, standing in the cold at $T = 15 \degree C$, during a 24 h period, maintaining the body temperature
constant and equal to $T_b = 37 \degree C$. Assume for the body: $m = 85 \text{ kg}$, $\rho = 1,235 \text{ kg/}m^3$, $c = 4,670$
$J/kg\degree C$, $k = 1.54 \text{ W/}mK$, and surface area: $A = 2 \text{ m}^2$. Perform an energy balance for the person
considering the following hypotheses: (i) uniform body temperature; (ii) no energy stored in the
body; (iii) convective heat transfer coefficient with environment: $h = 2.7 \text{ W/}m^2\degree C$; (iv) no energy
transferred to the environment by evaporation, radiation or by conduction.
