Integration of contaminant behaviour predictionwithin whole building simulation

Stand-alone software for predicting contaminant transport and behaviour is well developed, but to be more effective, it needs to be integrated within whole building simulation. This paper describes implementation of such a model within whole building dynamic simulation. The model is further enhanced by allowing specification of filter efficiencies, source/sink models, first order chemical reactions, contaminant based control and scheduled ambient concentration profiling. The model was validated against analytical solutions and for complex cases against CONTAM and COMIS. Empirical validation was carried out using information from IEA Task 23. The paper concludes with a case study illustrating the impact of including dynamic thermal and wind pressure conditions on predicted contaminant concentrations and flows.