Human heat balance equation (energy budget)

A mathematical equation that describes the net flow rate of exchanges of heat (gains and losses) to a human in a given environment. The conceptual heat balance equation (Parsons 2010) is:
M–W = E + RHE + C + K + S
where:
M is the metabolic rate .
W is the mechanical work done by the body
E is the evaporative heat gain or loss
RHE is the radiant heat exchange
C is the convective heat transfer
K is the conductive heat transfer
S is the net heat storage.
When the rate of heat storage is zero (S=0), the body is in heat balance (i.e. constant temperature). If there is a net heat gain (loss) then storage will be positive (negative) and the body temperature will increase (decrease) (Parsons 2010).

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