Passivhaus Institut

Dynamic building simulations with Dynbil

Prediction of thermal comfort and energy demand for innovative building concepts

Tools such as the PHPP with its steady-state energy balance method are insufficient for some uncommon planning tasks. For these, a very detailed analysis of the thermal processes in the building needs to be carried out. Such tasks may include e.g. buildings with unusually large glazing areas, special wall-structures, extremely large or small storage capacities, heating loads that fluctuate greatly over time, special requirements for indoor conditions etc.
The dynamic building simulation software Dynbil developed by the PHI allows a very detailed analysis of the thermal processes in the building. Heat storage, solar heat gains, internal head loads, ventilation processes etc. can be analysed with a temporal resolution of one hour or less.

Besides the classic application of thermal building simulation, which is the prediction of temperature and heating/cooling performance, it is also possible to calculate air humidity and moisture retention in building components.

The great advantages of dynamic simulation include the high temporal resolution, the depiction of temporally and spatially varying temperatures and the accuracy of the algorithms to the underlying physical principles.

The dynamic simulation programme DYNBIL is continuously being maintained and developed further and is applied mainly in research projects, but also for clients in the private sector.

Our services

DYNBIL calculations for the building sector in research projects and as contract work


Passive House in Darmstadt Kranichstein, Germany: Excellent correlation of simulation and measurements


Passive House office building, Wagner & Co., Cölbe, Germany
Flow path during night flushing	Planning goals achieved - Cooling period predictions made in the planning phase were confirmed during building use and show a overheating frequency of 3%.