Abbreviation	Definition
$A_d$	Dubois-Dubois corporal surface area
C	Dry heat transfer by convection
$C_{resp}$	Convective exchange by respiratory system
$C_{skin}$	Convective exchange at skin surface
CHS	Compensable heat stress
E	Heat exchange by evaporative heat dissipation
$E_{maxsweat}$	Maximum evaporative heat loss based on maximum sweat rate
$E_{max}$	Rate of evaporation given by the atmosphere and wettedness limitation of the body
$E_{req}$	Required heat loss to achieve heat balance
$E_{res}$	Evaporative heat loss from respiration
H	Humidity
$H_{eva{p}_{skin}}$	Evaporative heat loss from the skin surface
$H_{prod}$	Metabolic heat production
$I_{clo}$	Clothing insulation
IET	Individual experienced temperature
K	Dry heat transfer by conduction
Low $S_{eff}$	Low sweat efficiency (ωreq>0.5)
LS	Limited sweat to achieve the required evaporative loss
M	Metabolic rate
METs	Metabolic equivalents
mPET	Modified Physiological Equivalent Temperature
MRT	Mean radiant temperature
$MR{T}_{\mathrm{c}\mathrm{l}\mathrm{e}\mathrm{a}\mathrm{r}\mathrm{s}\mathrm{k}\mathrm{y}}$	Mean radiant temperature in clear sky conditions
$MR{T}_{\mathrm{p}\mathrm{a}\mathrm{r}\mathrm{t}\mathrm{l}\mathrm{y}\mathrm{c}\mathrm{l}\mathrm{o}\mathrm{u}\mathrm{d}\mathrm{y}}$	Mean radiant temperature in partly cloudy conditions
P	Atmospheric pressure
PET	Physiological Equivalent Temperature
PHE	Personal heat exposure
R	Dry heat transfer by radiation
S	Rate of internal heat accumulation, heat storage, or cumulative whole-body thermal load change
$S_{\mathrm{m}\mathrm{a}\mathrm{x}}$	Maximum sweat rate
${\mathrm{S}}_{\mathrm{c}\mathrm{o}\mathrm{n}}$	Solar constant
${\mathrm{S}}_{\mathrm{i}\mathrm{n}}$	Solar incoming radiation
SR	Sweat rate
$T_{air}$	Air temperature
TMY	Typical meteorological year
TMY3	Typical meteorological year data version 3
UHS	Uncompensable heat stress
UTCI	Universal Thermal Climate Index
UTCI-Fiala model	UTCI-Fiala mathematical model of human temperature regulation
WBGT	Wet bulb globe temperature
$W_k$	External work rate
${\omega }_{\mathrm{m}\mathrm{a}\mathrm{x}}$	Maximum skin wettedness
${\omega }_{\mathrm{r}\mathrm{e}\mathrm{q}}$	Skin wettedness