A METHODOLOGY FOR INDOOR AIR-FLOW COMPUTATIONS AND ENERGY ANALYSIS FOR A DISPLACEMENT VENTILATION SYSTEM

This article presents a methodology for the computation of indoor airflow, air quality, space load and energy consumption of a room with a displacement ventilation system. Since airflow and transient heat transfer in the room are interrelated, the indoor airflow and the space load of the room must be predicted simultaneously. In order to reduce the computing costs, a simplified method has been introduced for the predictions. According to the present state of the art, the κ-ε{lunate} turbulence model is suggested for the indoor airflow computations within a room. The air temperature distributions of the room are used in a cooling load program for space load calculations. This is very important for a room with a displacement ventilation system. An optimized algorithm is applied for the estimation of the energy consumption of the room. Finally, an application example is presented. The results indicate that, in a room with the displacement system, the indoor air quality is much better than with a well-mixed system, and the energy savings are significant. © 1990.