M (W/m2), Metabolic energy production (58 to 400 W/m2)
W (W/m2), Rate of mechanical work, (normally 0)
Ta (C), Ambient air temperature (< +10 C)
Tr (C), Mean radiant temperature (often close to ambient air temperature)
p (l/m2s), Air permeability (low < 5, medium 50, high > 100 l/m2s)
w (m/s), Walking speed (or calculated work created air movements)
v (m/s), Relative air velocity (0.4 to 18 m/s)
rh (%), Relative humidity
Icl (clo), AVAILABLE basic clothing insulation (1 clo = 0.155 W/m2K)

IREQ & Dlim results (minimal to neutral)

Insulation Required, IREQ to (clo)

Required basic clothing insulation (ISO 9920), Icl to (clo)

Duration limited exposure, Dlim to (hours)

Calculation of Required Recovery Time, RT

M (W/m2), Metabolic energy production, (normally lower!)
W (W/m2), Rate of mechanical work, (normally 0)
Ta (C), Ambient air temperature, (normally warmer!)
Tr (C), Mean radiant temperature, (normally warmer!)
p (l/m2s), Air permeability
w (m/s), Walking speed (normally lower)
v (m/s), Relative air velocity (normally lower!)
rh (%), Relative humidity
Icl (clo), Available basic clothing insulation, (normally lower!)

RT Results (neutral)

Required recovery time (hours)

Calculation of Winchill Temperature, twc

v (km/h), Meteorological wind speed (at 10 m)
Ta (C), Ambient air temperature

Results

Wind chill temperature, twc (C)