Experimental Study on Unsteady State Properties of Ceiling Radiant Cooling Panels System

摘要

Ceiling radiant cooling panels (CRCP) system is more comfortable and energy-saving than the traditional convection air-conditioning system according to the research of pioneers. The former research was concentrated in the feasibility, thermal comfort, and energy saving of the CRCP system. Changes of the system parameters are not described systematically under unsteady state. There are hardly any complete and credible reference materials for engineers to design CRCP system of buildings. In this paper, the radiant thermal performance was studied in the experimental platform, and the operating data of the CRCP system was collected in the startup phase and regulating phase of the platform. The results shows that the thermal inertia of the metal radiant panel is small and the response of thermal parameters is very fast under unsteady state in the experiment. The distribution of the surface temperature is uniform on the cool ceiling, and the heat transfer resistances are basically the same among different cooling panels. Learning the changing rules of the CRCP system would provide the engineers reference materials for running control, design, and assessment of the system in the future.