Study on condensation features of radiant cooling ceiling

摘要

This paper studies the condensation features of radiant panel by means of experiment and simulation. The temperature of radiant panels and relative humidity of the attached layer are tested and their effect on condensation time are analysed, in the start-up stage. In stable stage, the impact of wet source features on the condensation time are analysed using numerical calculation method. The results show that, in the start-up stage, the condensation occurs 6min after the starting. In the start-up stage the surface temperature of radiant decrease quickly. With the increasing of radiant temperature decrease rate, the condensations occur on the panel in advanced. So special attention should be paid on the surface temperature and effective measures should be taken to prevent condensation. In the stable stage, with the increasing of moisture diffusion rate the condensation occurs in advance but the'advanced rate of time decreases accordingly. The panel which is above the wet source was the first to occur dews. Condensation time is proportional to the distance between radiant panel and wet source. And the proportion decreases with the moisture diffusion rate increasing. Therefore, in order to prevent condensation in the stable stage, the temperature of the panel which is above the wet source must be tested and controlled.