JAVA applet for ISO 11079

CALCULATION OF REQUIRED CLOTHING INSULATION (IREQ),
DURATION LIMITED EXPOSURE (Dlim),
REQUIRED RECOVERY TIME (RT),
and Wind Chill Temperature (twc)

IREQ 2008 ver 4.2, Hakan O. Nilsson and Ingvar Holmer.
BOOKMARK THIS PAGE in order to ALWAYS use the LATEST VERSION of the code.

Disclaimer and references at the end of the document.

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

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 WINDCHILL TEMPERATURE, twc

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

Wind chill temperature, twc (C)


Disclaimer
The authors disclaim all obligations and liabilities for damages arising from the use or attempted use of the information, including, but not limited to, direct, indirect, special and consequential damages, and attorneys' and experts' fees and court costs.
Any use of the information will be at the risk of the user.

References
ISO 11079, 2007-12-15, ERGONOMICS OF THE THERMAL ENVIRONMENT - DETERMINATION AND INTERPRETATION OF COLD STRESS WHEN USING REQUIRED CLOTHING INSULATION (IREQ) AND LOCAL COOLING EFFECTS

Web-contact: Ingvar Holmer

Email: ingvar.holmer@design.lth.se