Per Sahlin, Lars Eriksson, Pavel Grozman, Hans Johnsson, Alexander Shapovalov and Mika Vuolle
Bibliographic info:
BUILDING SIMULATION, 8, 2003, Eindhoven, Netherlands, p. 1147-1154

In building simulation, as in several other domains, traditional monolithic simulation codes are still in dominance over simulators based on symbolic equations in a general modeling language. Introduced in 1998, IDA Indoor Climate and Energy has become the first widely spread thermal building performance simulator based on the new technology. Developing a full-fledged dynamic whole-building simulation pro- gram is a formidable endeavor in any  setting  and since the first beta version in 1997 a number of les- sons have been learned. The paper shares some of these experiences concerning general program struc- ture and GUI design as well as issues specifically linked to equation-based modeling using a  variable timestep differential-algebraic (DAE) solver.