The development of TRNFLOW was finished in March 2003. Since that date it has already proved it’s strength in various projects like in the simulation of cross ventilation of offices, natural ventilation of double facades and atria’s, the pressure difference at doors of high-rise buildings or pollutant concentration in a building. The Figures 7 and 8 show a multi story building with double facade as an example.

TRNFLOW has demonstrated its suitability for large building models by an example with more than 60 thermal zones and lots of auxiliary nodes. No numerical or other difficulties have been obtained in those runs.