Climate Michel model

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The Klima-Michel model is an energy balance model for the human organism. The model was presented by Jendritzky in 1990 and is now used by the German Weather Service . It is based on a comfort equation by Fanger (1972) and his PMV value and contains a humidity-dependent correction for warm, humid conditions according to Gagge (1986). By taking into account the variables relevant for the human heat balance, the model is able to describe the temperature perception of an average person in terms of comfort, heat load and cold stress. For this average person, called Michel, different assumptions apply: a height of 1.75 meters, a body weight of 75 kilograms, a body surface of 1.9 square meters and an age of about 35 years.

The thermal sensation is described as a function of the activity of the person, the heat insulation of the clothing, the air temperature , the wind speed (see also wind chill ), the water vapor pressure ( air humidity , see also Humidex ) and the mean radiation temperature (mainly exposure to direct solar radiation ). For human activity, a work performance of 116 watts per square meter of body surface is generally estimated, which corresponds roughly to faster walking.

As a result of the calculations, for the sake of clarity, the perceived temperature in degrees Celsius is used to describe the thermal sensation . People's clothing is always adapted to the conditions in order to achieve the highest possible level of comfort.

literature

  • Poul O. Fanger: Thermal Comfort. Analysis and Applications in Environmental Engineering . Warriors, Malabar, Fla. 1982, ISBN 0-89874-446-6
  • Adolf Gagge et al. a .: A Standard Predictive Index of Human Response to the Thermal Environment . In: American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE): Transactions , Vol. 92 (1986), pp. 709-731
  • Gerd Jendritzky et al. a .: Methodology for the spatial evaluation of the thermal components in the human bioclimate (updated Klima-Michel-Modell) . In: Contributions from the Academy for Spatial Research and Regional Planning , Vol. 114 (1990)
  • Henning Staiger u. a .: Perceived temperature. The physiologically fair evaluation of heat and cold stress when staying outdoors with the measure of degrees Celsius . In: Annalen der Meteorologie , Vol. 33 (1997), pp. 100-107

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