Calculation of the Condensation Rate of the Radiant Cooling Panel in Hot and Humid Climate

摘要

The condensation rate on the radiant cooling panel in hot and humid air is an important parameter for engineering design of the radiant cooling,which varies with the locations of the radiant cooling such as the wall,floor and ceiling.The nature of condensation on radiant cooling in humid air is natural convection flows resulting from the combined buoyancy effects of thermal and mass diffusion.In this paper,the steady-state condensation rate on the radiant panels was calculated by the simplified N-S equations with Boussinesq approximation and the analogy between heat and mass transfer.The theory results were compared with the experiment results described in previous literature.As the characteristic length is 1m,the mass transfer coefficient of the radiant floor is about 0.8×10-3m/s,the one of the radiant vertical wall is about 2.4×10-3m/s and the one of the radiant ceiling is about 3.7×10-3m/s.As a result,the condensation rate of radiant ceiling is 4 times larger than that of radiant floor and about 1.5 times larger than that on the radiant wall.This research is useful to quantitatively describe the condensation risk on radiant cooling panels with the estimated exposure time to hot and humid air.