Radiant cooling ceiling systems have already been proven to potentially provide an improved thermal
comfort environment. This work conducted a full-scale experiment in an office, and a computational
fluid dynamics (CFD) simulation study for a radiant cooling ceiling system integrated with air dehumidification
equipment installed in this test space. The obtained results from the experiment were
compared with the values from the CFD simulation to validate the accuracy of the model. Predicted mean
vote (PMV) index was used to assess the original indoor thermal condition and improved conditions
according to the simulation results. Experimental variables included supply air temperature from the
diffuser, surface temperature, and the area of the cooling panels. In addition, diffuser position in the
mechanical ventilation system was analyzed that provided suggestions on improving the design of
radiant cooling ceiling panels. This study proposed solutions alongside limitations on improving indoor
thermal comfort and energy efficiency using a radiant cooling ceiling system in the subtropical regions of
Taiwan