An Experimental Study of Surface Temperature Performance on Wall and Ceiling of Hybrid Radiant Cooling Panels in Tropical Apartment

A hybrid radiant cooling system is needed as one of the strategies to fulfil indoor thermal comfort and building energy efficiency. The integration of ceiling and wall radiant panels is designed to provide effective cooling through a combination of radiation and convection. The hybrid radiant cooling system combined with the airbox convector is expected to control the surface temperature on each panel. This study aims to examine the performance of surface temperature on wall and ceiling radiant panels through a hybrid radiant cooling system that has been integrated with airbox convector units in low-rise residential units in humid tropical climates to control the risk of condensation. The experimental method was carried out in the chamber of a low-rise apartment unit within closed room conditions. The results showed that the surface temperature on the wall radiant cooling panel was 1,03 - 1,72 °C higher than on the ceiling in the case of combined wall and ceiling panels. The increase of air velocity from the airbox convector unit also affects the increasing effectiveness of convective cooling on the radiant cooling panel so that the surface temperature on each panel can be controlled to prevent or reduce the risk of condensation.