One of the first multi-zone models, LEAK, was published by Jackman in 1970. Since then, at least 50 other models have been developed. Along with the development of computers models have become more detailed. Today it is possible to model very complex buildings and ventilation systems with more than 100 different zones. Thermal simulation programs have also developed tremendously in the same period. At first the two types of programs were developed separately. Multi-zone models incorporated simple routines for the energy transport and the thermal simulation programs incorporated simple single-zone models for the mass flow. In recent years much work has been carried out to combine multi-zone models and thermal simulation programs, e.g. CODYRUN and TRNSYS. In Denmark multi-zone models have rarely been used, whereas thermal simulation programs have been widely used. The Danish Building Research Institute has developed a thermal simulation program called BSim2002. This user-friendly program is a de facto standard in Denmark. Therefore, the objective of this work is to provide an accurate and user-friendly simulation tool that will enable engineers to calculate yearly IAQ and energy savings when using natural ventilation as the main ventilation principle. This will be obtained by constructing a multi-zone model for the airflow that at a later time can be incorporated into BSim2002. The objective of the present research is to establish a model that makes it possible to calculate the airflow inside the building. Special effort will be devoted to the calculation of temperature gradients in each zone and night cooling in summer. The project is funded through the Hybrid Ventilation Centre Aalborg University and performed in cooperation with the Danish Building Research Institute.
Effective start/end date01/08/200031/12/2004