Calcolatore Indice IREQ

CALCULATION OF REQUIRED INSULATION, IREQ AND
DURATION LIMITED EXPOSURE, Dlim

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 > 100 (high permeability: the outer layer of the fabric allows air to pass easily.)5 < p ≤ 100 (moderate permeability)p ≤ 5 (low permeability: the outer layer of fabrics does not allow air to pass through, technical fabric.)p = 8 (windproof fabrics)
w (m/s), Walking speed (normally lower)
v (m/s), Relative air velocity (0.4 to 18 m/s)
rh (%), Relative humidity
0.5 (Brief, short-sleeve shirt, fitted trousers, calf lenght socks, shoes)0.6 (Underpants, shirt, fitted trousers, socks, shoes)0.7 (Underpants, coverall, socks, shoes)0.8 (Underpants, shirt, coverall, socks, shoes)0.9 (Underpants, shirt, trousers, smock, socks, shoes)1.0 (Briefs, undershirt, underpants, shirt, overalls, calf length socks, shoes)1.1 (Underpants, undershirt, shirt, trousers, jacket, vest, socks, shoes)1.3 (Underpants, shirt, trousers, jacket, coverall, socks, shoes)1.4 (Undershirt, underpants, insulated trousers, insulated jacket, socks, shoes)1.5 (Briefs, Tshirt, shirt, fitted trousers, insulated coveralls, calf length socks, shoes)1.6 (Underpants, undershirt, shirt, trousers, jacket, overjacket, hat, gloves, socks, shoes)1.9 (Underpants, undershirt, shirt, trousers, jacket, overjacket, overtrousers, socks, shoes)2.0 (Underpants, undershirt, shirt, trousers, jacket, overjacket, overtrousers, socks, shoes, hat, gloves)2.2 (Undershirt, underpants, insulated trousers, insulated jacket, overtrousers, overjacket, socks, shoes)2.5 (Undershirt, underpants, insulated trousers, insulated jacket, overtrousers, overjacket, socks, shoes, hat, gloves)3( Arctic clothing systems)4.2( Arctic clothing systems) Icl (clo), AVAILABLE basic clothing insulation (1 clo = 0.155 W/m2K)

Iclr: 1.9 Iclr is the corrected Icl value for the effects of wind penetration and activity, taking into account the air permeability of the outer garment layer.

M: 157.9 W, is the metabolic rate value calculated by the analysis method.

IREQ & Dlim RESULTS (minimal to neutral)

Insulation Required, IREQ to (clo)

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

Duration limited exposure, Dlim (calculated from IREQneutral) (hours)

CALCULATION OF REQUIRED RECOVERY TIME, RT

W (W/m2), Rate of mechanical work, (normally 0)
Ta (C), Ambient air temperature, (normally warmer!)
Tr (C), Mean radiant temperature, (normally warmer!)
p > 100 (high permeability: the outer layer of the fabric allows air to pass easily.)5 < p ≤ 100 (moderate permeability)p ≤ 5 (low permeability: the outer layer of fabrics does not allow air to pass through, technical fabric.)p = 8 (windproof fabrics)
w (m/s), Walking speed (normally lower)
v (m/s), Relative air velocity (normally lower!)
rh (%), Relative humidity
0.5 (Brief, short-sleeve shirt, fitted trousers, calf lenght socks, shoes)0.6 (Underpants, shirt, fitted trousers, socks, shoes)0.7 (Underpants, coverall, socks, shoes)0.8 (Underpants, shirt, coverall, socks, shoes)0.9 (Underpants, shirt, trousers, smock, socks, shoes)1.0 (Briefs, undershirt, underpants, shirt, overalls, calf length socks, shoes)1.1 (Underpants, undershirt, shirt, trousers, jacket, vest, socks, shoes)1.3 (Underpants, shirt, trousers, jacket, coverall, socks, shoes)1.4 (Undershirt, underpants, insulated trousers, insulated jacket, socks, shoes)1.5 (Briefs, Tshirt, shirt, fitted trousers, insulated coveralls, calf length socks, shoes)1.6 (Underpants, undershirt, shirt, trousers, jacket, overjacket, hat, gloves, socks, shoes)1.9 (Underpants, undershirt, shirt, trousers, jacket, overjacket, overtrousers, socks, shoes)2.0 (Underpants, undershirt, shirt, trousers, jacket, overjacket, overtrousers, socks, shoes, hat, gloves)2.2 (Undershirt, underpants, insulated trousers, insulated jacket, overtrousers, overjacket, socks, shoes)2.6 (Undershirt, underpants, insulated trousers, insulated jacket, overtrousers, overjacket, socks, shoes, hat, gloves)3( Arctic clothing systems)4,5( Arctic clothing systems) Icl (clo), AVAILABLE basic clothing insulation (normally lower!)

RT RESULTS (neutral)

Required recovery time (hours)

CALCULATION OF WINDCHILL TEMPERATURE, twc

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

Wind chill temperature, twc (C)