Special Issue (UTCI)

International Journal of Biometeorology

, Volume 56, Issue 3, pp 429-441

First online:

UTCI-Fiala multi-node model of human heat transfer and temperature regulation

  • Dusan FialaAffiliated withErgonSim – Comfort Energy EfficiencyInstitute of Building Technologies (IBBTE), University of Stuttgart Email author 
  • , George HavenithAffiliated withEnvironmental Ergonomics Research Centre, Loughborough University
  • , Peter BrödeAffiliated withLeibniz Research Centre for Working Environment and Human Factors (IfADo)
  • , Bernhard KampmannAffiliated withDivision of Applied Physiology, Occupational Medicine and Infectiology, Department of Safety Engineering, Bergische Universität Wuppertal
  • , Gerd JendritzkyAffiliated withMeteorological Institute, Albert-Ludwigs-Universität Freiburg

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The UTCI-Fiala mathematical model of human temperature regulation forms the basis of the new Universal Thermal Climate Index (UTC). Following extensive validation tests, adaptations and extensions, such as the inclusion of an adaptive clothing model, the model was used to predict human temperature and regulatory responses for combinations of the prevailing outdoor climate conditions. This paper provides an overview of the underlying algorithms and methods that constitute the multi-node dynamic UTCI-Fiala model of human thermal physiology and comfort. Treated topics include modelling heat and mass transfer within the body, numerical techniques, modelling environmental heat exchanges, thermoregulatory reactions of the central nervous system, and perceptual responses. Other contributions of this special issue describe the validation of the UTCI-Fiala model against measured data and the development of the adaptive clothing model for outdoor climates.


Physiological simulation Human exposure Outdoor environment Multi-segmental model Thermoregulatory system