Numerical investigation of the thermal performance of a radiant ceiling cooling panel with segmented concave surfaces

Radiant cooling/heating (RCH) panel systems have recently received increasing attention because of their energy-efficient operation and improved comfort performance. Therefore, this study proposes a novel RCH with segmented concave surfaces. The new has the same surface area as conventional flat panel. A series laboratory tests were conducted to investigate heat transfer characteristics inside chamber equipped Moreover, three-dimensional finite volume simulation was developed transfer, fluid flow, thermal conditions single room proposed panel, results compared those under operating cooling load. First, curvature cord length ratio radius (L/R) optimized in range 0 (flat) 2. In all cases, same, but coverage varied. addition, impact different ratios from 55% 81% influence adding void spaces 29 mm 11 between adjacent curved segments analyzed. showed that achieved good agreement experimental an accuracy 98.9%. played essential role decreasing indoor air temperature by 2 °C reducing floor 1.6 °C. When L/R changed 1.5 at 81%, average decreased 1 2.9 reduced radiation coefficient, hr, 31%, while convection hc, upper increased 174%. Changing only shape enhanced performance environment.