This paper presents the concept of air-conditioning and thermal environment of the monumental historic auditorium at the University of Wroclaw. There are several requirements to be taken into account concerning the air-conditioning, since this is both a museum and an assembly hall. To maintain the required air parameters, as well as good air quality, comfort airconditioning was designed, using an all-air system with heat recovery. A heat-humidity balance for the auditorium using dynamic thermal calculations was derived by use of a computer program -the building thermal model ESP-r. The concept of the air distribution in the auditorium was validated and improved, numerically predicting the flow of air, heat, humidity and carbon dioxide, using the computer code CFD ANSYS Airpak. This confirmed that the air-conditioning can ensure the airing of the auditorium and the maintaining of air parameters within the required ranges.

This paper presents the results of tests on the two-zone airflow pattern that forms in a room with displacement ventilation under conditions of various heat sources and airflow rates. The position of the interface layer between the zones was determined experimentally by tracer gas concentration measurement and by applying a plume model for a point heat source. The following heat sources were used: a plume simulator, a desk lamp, a computer, a round plate and a human body. Quasi-laminar diffusers supplied the air. The test results show that, in order to define the interface position in displacement ventilation where real extensive heat sources are used, it is possible to apply the experimentally completed model of a plume above a point heat source.