Problems following the application of optimal operative temperatures estimated on the basis of PMV and the necessity to apply correct values in the new Czech Government Directive No. 523/2002 Code led to experiments based on the physiological human body response instead of solely people's feelings in a given environment. On the basis of experiments on 32 subjects (university students) it has been possible to estimate: a) the total balance of hygrothermal flows between the human body and the environment, b) the optimal operative temperature as a function of the subject's activity, c) the thermoregulatory range for each optimal operative temperature, i.e. maximal (category C_(max)) limited by the onset of sweating, minimal (category C_(min)) limited by the onset of shivering (category C can be applied to naturally ventilated buildings), optimal (comfort level - category A) defined by time constant 0.368 (can be applied to air conditioned buildings), and submaximum (decreased comfort level - category B) defined by time constant 0.632 (can be applied to buildings with basic air conditioning systems).
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