Since 2006 the working group “„Climatology of Extreme Environments“ at Ruhr-University Bochum is conducting climatological studies in Schellenberger Eishöhle at Untersberg (Berchtesgaden Alps). In the course of the research activities the work was repeatedly limited due to the energy supply at the study site. Over the years more and more questions arose during data analysis, which we could not clarify with our standard methods. Since these difficulties also exist at many other ice cave sites, we began to develop the calcFlow method in the course of my dissertation, which uses air temperature measurement to determine the airflow in the ice cave. In the presentation we present the method as well as first results of the determination of the energy balance of one passage section.