Individually controlled localized chilled beam combined with chilled ceiling: Thermal environment

Journal article, 2025

This study evaluates the performance of an individually controlled localized chilled beam combined with a chilled ceiling system (LCBCC) in a test room under summer conditions using physical measurements and thermal manikin experiments. The thermal environment generated by the LCBCC is compared with the mixing ventilation combined with a chilled ceiling system (MVCC) at room temperatures of 26°C and 28°C. Results indicate that compared to MVCC the LCBCC improved the thermal environment at the targeted workstation exposed to strong radiant asymmetry from the window, while maintaining a comparable thermal environment in the remaining part of the occupied zone. Measurements of air velocity, air temperature, and radiant temperature asymmetry confirm that LCBCC mitigates localized heat sources and provides a comfortable thermal environment with minimal risk of discomfort, such as draught. Whole-body and segmental equivalent temperatures derived from manikin data closely correlate with human subject responses from the previous study, demonstrating their reliability in predicting thermal sensation. The study also highlights the importance of individual airflow control in adapting to occupant-specific preferences and activities. Findings of the study offer insights for optimizing LCBCC design, operation, and integration in practical applications.