Neuartige Belüftungskonzepte für zukünftige, autonome Fahrzeuge

Abstract

Passenger comfort and ventilation efficiency in cars have attracted the attention of scientists and car manufacturers over the last years. The reason for this increase in interest is theconsiderable potential in terms of improving thermal passenger comfort, increasing efficiency and reducing energy consumption. To ensure a realistic measurement environment, a 1:1 scale generic mid range car was developed, constructed and used to simulate different season conditions. Four thermal manikins simulated the metabolism and obstruction of real passengers. To investigate both thermal comfort and ventilation efficiency, velocity and temperature measurements were performed for horizontal and low momentum vertical ventilation concepts. In particular vertical ventilation concepts turned out to be highly suitable in case of the new car models designed for autonomous driving. To assess thermal comfort with regard to temperature, velocity and radiation, the equivalent temperature of the thermal manikins was determined for steady state and dynamic conditions. Clear differences were found between the vertical and horizontal ventilation concepts. Especially for the heating scenario - representing winter conditions vertical ventilation reveals significant benefits in terms of thermal comfort and heating efficiency. However, in case of cooling for the summer scenario, the horizontal high momentum ventilation offers several advantages regarding thermal comfort. At the conference we would like to present a survey of our work on comfortable and efficient climatization of car cabins. To be more specific, the the results of an experimental study of thermal comfort, heating/cooling efficiency and ventilation efficiency for four different ventilation concepts will be presented.