Worldwide the radiant cooling system is used as an energy-efficient alternative to conventional air conditioning systems. Understanding the heat extraction characteristics of the radiant cooling system is necessary to understand the system’s thermal performance. The radiant cooling system’s heat extraction characteristic differs from conventional air conditioning system. The predominant form of heat transfer is through radiation, that is more than 50% of heat transfer takes place by radiation. In this study, the focus is to evaluate the heat extraction characteristic of the radiant cooling system by varying panel position, area of cooling panel, water mass flow rate, and water set temperature. The ratio of radiative heat flux to total heat flux (q_r/q_tot) is used to evaluate the system’s thermal characteristics. The study’s outcome indicates that the radiative heat transfer coefficient (h_r) varies from 5.7 to 6.03 W/m² K throughout the experimental study, indicating that the h_r value remains relatively constant. The study shows that at steady state, increase in mass flow rate of water and water set temperature increases the percentage of radiative heat flux to total heat flux (q_r/q_tot). At steady state, increase in area of radiant cooling panel decreases the ratio of q_r/q_tot. The radiant cooling panel area restricts the cooling capacity of a radiant cooling system. The cooling capacity can be enhanced for a given area of radiant cooling system by adding fins to the radiant panel or by increasing convective heat transfer. In this study, the cooling capacity of the radiant cooling system is enhanced using a ceiling fan. The outcome shows that when Wall B is active at T_w of 25 °C, there is a 19% increase in the cooling capacity of the radiant cooling system as air velocity in the chamber increases from 0 to 0.95 m/s.

在世界范围内，辐射冷却系统被用作传统空调系统的节能替代方案。了解辐射冷却系统的排热特性对于了解系统的热性能是必要的。辐射冷却系统的排热特性与传统空调系统不同。传热的主要形式是通过辐射，即50%以上的传热是通过辐射进行的。在本研究中，重点是通过改变面板位置、冷却面板面积、水质量流量和水设定温度来评估辐射冷却系统的排热特性。辐射热通量与总热通量之比（q _r / q _tot）用于评估系统的热特性。研究结果表明，在整个实验研究过程中，辐射传热系数（_hr）在5.7至6.03 W/m ^{2  K}_之间变化，表明hr值保持相对恒定。研究表明，在稳定状态下，水的质量流量和水设定温度的增加会增加辐射热通量占总热通量的百分比（q _r / q _tot）。在稳定状态下，辐射冷却板面积的增加会降低q _r / q _tot的比率。辐射冷却面板面积限制了辐射冷却系统的冷却能力。通过在辐射板上添加翅片或增加对流传热，可以增强辐射冷却系统给定区域的冷却能力。在这项研究中，使用吊扇增强了辐射冷却系统的冷却能力。结果表明，当壁 B 在T _w为 25 °C 时激活时，随着腔室内的空气速度从 0 增加到 0.95 m/s，辐射冷却系统的冷却能力增加 19%。