To find the amount of evaporative heat transfer required for the human being to be in neutral equilibrium, we need to apply the human energy balance equation. For neutral equilibrium, the net heat exc

To find the amount of evaporative heat transfer required for the human being to be in neutral equilibrium, we need to apply the human energy balance equation. For neutral equilibrium, the net heat exchange is zero, meaning metabolic heat production is balanced by heat losses (convection, radiation, and evaporation).

The energy balance equation is:

$$M - W = C + R + E$$

Where:

• $M$ = Metabolic heat production (W)
• $W$ = External work done (assumed negligible or included in $M$)
• $C$ = Convective heat transfer (W)
• $R$ = Radiative heat transfer (W)
• $E$ = Evaporative heat transfer (W)

We are looking for $