Thermal comfort analysis of coupled fan and radiant air conditioning system
A system that couples radioactive cooling and acoustical panels was proposed to solve the noise problem of the radiant ceiling cooling system,and a fan(blowing down)was added between the radiant ceiling and the acoustical panels to offset the decrease of radiant heat exchange due to the panels.The study was focused on the airflow distribution,thermal comfort and the change of heat transfer coefficient of the coupled system.The influencing factors include the coverage rate of the acoustical panels,fan speed and room height.The results show that the addition of fan enhances the convection and total heat transfer of the ceiling.With the increase of fan speed and the decrease of acoustical panels coverage,the indoor air temperature decreases.Compared with the radiant ceiling cooling system without fan,the PMV value is reduced by 0.37～0.40 at high speed of the fan.The total heat transfer coefficient is increased by 28.4%～45.4%.The growth rate of total heat transfer coefficient reaches the peak when the coverage rate of the acoustical panels is 16%.It suggests that the discomfort at higher room temperature can be compensated by increasing the indoor air flow.The research results provide a promising and practical design scheme for the implementation of radiant ceiling system.
radiation ceilingfanacoustical panelsCFDPMVheat transfer coefficient
万方数据
维普
