辐射冷却末端实际空间制冷特性及影响因素研究

Research on the actual space cooling capacity and influencing factors of radiant cooling terminal

为了研究冷却流体参数对于辐射冷却末端实际制冷性能的影响规律,搭建了小室模拟实际房间,采用了房间热平衡的实验测试方式来精准计量辐射冷却末端的实际制冷能力,研究分析了流量、进水温度、铺设方式等因素对于辐射板实际空间制冷能力的影响。实验结果表明,通过增大进水流量和降低进水温度(不低于露点温度)的方式均可提高单位面积辐射冷却末端的实际空间制冷能力。在0.5 m~3/h流量工况下,随着进水温度从18.42℃降低至14.53℃,单位面积辐射板的实际空间制冷能力从41.48 W/m^(2)增大至95.19 W/m^(2)。仅顶板铺设辐射板是提高单位面积辐射板制冷能力的最佳铺设方式,相对于顶板+底板双壁面铺设辐射板而言,仅顶板铺设辐射板时的单位面积辐射板实际空间制冷量可提高18.6%~46.67%。

In order to study the influence of cooling fluid parameters on the actual cooling capacity of the radiant cooling terminals,a small room was builded to simulate the actual room,the experimental test of the room heat balance was used to accurately measure the actual cooling capacity of the radiant cooling terminals the room,the influence of flow rate,the inlet water temperature,the way of laying on the actual space cooling capacity was analyzed.The experimental results show that the actual space cooling capacity per unit area of radiant cooling end can be increased both by increasing the inlet water flow rate and by decreasing the inlet water temperature (not lower than the dew point temperature).Under the condition of 0.5 m~3/h flow rate,as the inlet water temperature is reduced from 18.42℃ to 14.53℃,the actual space cooling capacity per unit area of radiant plate is increased from 41.48 W/m^(2) to 95.19 W/m^(2).Only the top plate laying radiation plate is the best laying way to improve the cooling capacity per unit area of radiation plate,compared with the top plate and bottom plate double wall laying radiation plate,only the top plate laying radiation plate when the actual space cooling capacity per unit area of radiation plate can be increased by 18.6%~46.67%.