Paper Conference

Proceedings of BauSim Conference 2014: 5th Conference of IBPSA-Germany and Austria


Simulation der raumklimatischen Zustände in der Umgebung einer Person bei verschiedenen Lüftungssystemen

W. Kozak, R. Gritzki, A. Perschk, M. Rösler, C. Felsmann

Abstract: The Fanger’s global thermal comfort model envisions small relevance of relative humidity for the comfort perception of human subjects. However in many cases a local discomfort or health problems are reported because of too high or too low humidity. Up to date this phenomenon is not reflected in the local comfort criteria. The thresholds beyond which the humidity is judged too high or too low are fuzzy and require further research. The only way to get the detailed and clear solution of the above stated open questions is to conduct extensive measurements of human subjects and their thermal sensations in varying environments. In this paper we hope to provide an approximate solution by using the combination of computational simulation with the results of simplified evaporation experiments. It is assumed that the sensation of dryness or stuffiness of the air is caused mainly by the too intensive or insufficient evaporation from the skin. Following this premise a model of water evaporation through the non sweating human skin has been developed. It considers the influence of air parameters on the evaporation rate that has been quantified by measurements in a climate chamber. This model has been used to emulate the conditions occurring in different HVAC systems and calibrated in order to argree with the known models and data. The further development of the model has been discussed.
Pages: 415 - 422