Abstract
Most gymnasiums belonging to schools and other public buildings are used for assembly as well as for indoor training. When a gymnasium is used for assembly, the occupants are supposed to be various kinds of people, such as children, elders and handicapped people etc. Therefore the installation of an appropriate HVAC system is required in such gymnasiums. In this paper, the heating system and indoor conditions in a gymnasium are examined with a field study and numerical simulations. The field study in a gymnasium with a heating system was carried out in winter in order to know the actual condition, such as vertical temperature distribution and airflow pattern of supply jet. Based on the result of the field study and previous studies, seven types of heating system with various layouts of supply/exhaust openings and angles of supply jet were selected and studied by numerical analysis. In the macroscopic model simulations, the vertical temperature distribution and the heat load were predicted for each type of heating system. Microscopic simulations (CFD, Computational fluid dynamics) were conducted on the five heating systems that were found to have good efficiency by the macroscopic model. In the microscopic simulation, the details of airflow pattern and temperature distribution were examined and the selection of appropriate heating system in a gymnasium was discussed.
