Multi-perspective analysis and design guidance of passive chilled beam for room cooling: A numerical investigation

Passive chilled beam (PCB) systems have attracted considerable attention for the application in public buildings due to its improving energy efficiency and thermal comfort. The ventilation performance of the PCB is comprehensively evaluated using a validated numerical model in the present study. Three key influencing factors are considered: PCB cooling capacity (qPCB), aspect ratio (AR), and false ceiling configuration. The results indicate that the overall indoor temperature is reduced from 25.2 °C to 22.7 °C with increasing qPCB from 20 to 60 W/m2. However, the vertical temperature difference is increased by 0.2 °C in the seated position and 0.6 °C in the standing position. Comprehensive analysis indicates that an optimal AR within the range of 0.17–0.20 results in the most uniform indoor temperature field, minimizes the extent of overcooled zones, and optimizes the distribution of PMV and PD, achieving a balance between cooling efficiency and thermal comfort. The installation of a false ceiling leads to an increase in indoor temperature by approximately 0.3 °C, compared to the scenario without a false ceiling. Hollow square false ceiling present better overall performance, with a more uniform indoor temperature distribution and a reduced sensation of the cold air.