Thermal Comfort in Hot Outdoor Environment Under Unsteady Conditions
One of the major problems of outdoor thermal comfort assessment is the quantification of thermophysiological parameters in order to model human heat balance, especially under unsteady conditions. In this context, the aim of this study is to investigate the thermophysiological parameters involved in human heat balance and their contribution to heat fluxes associated with the human body. This applies for a person leaving a typical indoor environment and seating quite under the shade of a tree for 30 min. In order to achieve these simulations, the Instationary Munich Energy-Balance Model (IMEM) is employed. Body temperatures and heat fluxes are modelled for a standard male at intervals of 1 min, using meteorological measurements carried out during ten experimental days under hot summer conditions. Although the current study reveals that the temporal pattern of mean skin temperature has a similar form, there are found marked quantitative differences among the experimental days, varying from 2°C to 3.2°C. This variation depends primarily on the increase of the air temperature.
KeywordsThermal Comfort Radiant Temperature Model Subject Unsteady Condition Skin Wettedness
Prof. Matzarakis A. of the University of Freiburg and Prof. Höppe P., for providing the model IMEM are highly acknowledged.
- ASHRAE (2004) Thermal environmental conditions for human occupancy. ASHRAE standard 55, AtlantaGoogle Scholar
- ISO 8996 (2004) Ergonomics of the thermal environment – determination of metabolic rate. International Organization for Standardization, GenevaGoogle Scholar
- Katavoutas G, Theoharatos G, Flocas HA, Asimakopoulos DN (2010) A field study of heat stress under different thermal and radiation conditions. In: Proceedings of 10th international conference of meteorology, climatology and atmospheric physics, Patras, pp 486–494Google Scholar
- Nishi Y, Gagge AP (1977) Effective temperate scale for use in hypo- and hyperbaric environments. Aviat Space Environ Med 48:97–107Google Scholar