基于CFD的辐射冷顶板与风扇耦合系统性能优化
Performance optimization of coupled system of radiant cooling ceiling and fan based on CFD
摘要：
吸音板用来解决辐射式天花板供冷系统的噪声问题,但其阻碍了辐射换热。本文提出通过风扇的调风作用来优化辐射冷顶板与风扇耦合系统,基于CFD模拟讨论了耦合系统的室内气流分布、热舒适及换热系数变化,研究了吸音板安装方式、风扇转速和风扇转向对辐射天花板性能的影响。结果表明:风扇的加入增大了顶板的对流换热系数和总换热系数;随着风扇转速的增大,室内的空气温度和人体热舒适性评价指标(PMV)降低;风扇向上吹风的效果优于向下吹风,吸音板竖直安装优于水平安装。
Abstract：
The acoustical panel is used to solve the noise problem of the radiant ceiling cooling system, but it hinders the radiant heat transfer. This paper proposes to optimize the coupled system of radiant cooling ceiling and fan by adjusting the wind of the fan. Based on CFD simulation, the indoor air distribution, thermal comfort and heat transfer coefficient of the coupled system are discussed. The effects of the installation mode of the acoustical panel, fan speed and fan steering on the performance of the radiant ceiling are studied. The results show that the addition of the fan enhances the convection heat transfer coefficient and the total heat transfer coefficient of the ceiling. With the increase of fan speed, indoor air temperature and human thermal comfort evaluation index (PMV) decrease. The upward-blowing effect of the fan is better than the downward-blowing effect. The vertical installation of the acoustical panel is better than the horizontal installation.
Keywords:radiant ceiling; fan; acoustical panel; CFD simulation; thermal comfort; heat transfer coefficient