Experimental examination of heat transfer performance of the heated radiant wall system

In recent years, radiant heating systems have been catching more observation under favor of the many advantages such as; energy saving and thermal comfort. However, owing the fact that limited information on the system dynamics and the heat transfer characteristics of radiant systems, conventional systems are still preferred to radiant systems. Thereupon, radiant ceiling and floor systems are favored to wall systems. Also previous researchers have focused on radiant ceiling and floor systems instead of radiant wall systems. For this reason, a controlled climatic test set-up was built and detailed examinations were conducted. In this regard, to evaluate the heat transfer coefficients of the radiant wall panels, 10 different test cases were run using different supply water temperatures. On the basis of the obtained measurements, in the steady state, heat transfer coefficients, depending on the characteristic temperature differences and the heat transfer rates have been calculated. According to the results, the approximate mean values of 2.40, 5.49 and 8.29 W/m²K were evaluated, respectively for the convective, radiant and total heat transfer coefficients of radiant wall heating systems.