沟槽充液式辐射板的供冷性能实验研究

Experimental Study on Cooling Performance of a Grooved Liquid Filled Radiant Panel

本文设计了一种吊顶式新型冷辐射板。辐射板采用铝合金表面结构,辐射板内置13根U型换热铜管,铜管外表面与辐射板内表面形成沟槽式通道,通道内充注传热介质。在人工气候小室内开展了辐射板供冷性能的实验研究。研究结果表明:沟槽式结构及换热通道内充液可显著提高辐射板表面温度的均匀性,消除局部低温冷并可强化冷水与辐射板外表面间的换热能力。在小室温度为27~34℃,冷水供水温度为15~17℃,供水流量为0.1~0.2 L/s时,其单位面积制冷量可达260~720 W/m2。辐射板壁面各点间温度较为均匀,最大温差小于2.9℃。测试条件下,辐射板下方垂直方向上温度梯度小于3℃/m,采用此辐射板供冷可实现较好的热舒适性。

A new cold ceiling radiant panel is designed in this paper. The surface of the radiant panel is made of aluminum alloy, and 13 U type heat exchange copper tubes are built in the radiant panel. The outer surface of the copper tube and the inner surface of the radiant panel form a slot type channel, and the heat transfer medium is filled in the channel. The experimental study on the cooling performance of the radiant panel has been carried out in a small artificial climate chamber. The research results show that: the groove structure and liquid filling in the heat transfer channel can significantly improve the uniformity of the surface temperature of the radiant panel, eliminate the low temperature and enhance the heat transfer between the cold water and the outer surface of the radiant panel. When the temperature of the chamber is 27~34 ℃, the water supply temperature is 15~17 ℃ and the water supply flow rate is 0.1~0.2 L/s, the cooling capacity per unit area can reach 260~720 W/m2. The radiation wall temperature distribution is uniform, the maximum temperature difference is less than 3.4 ℃. Under the test conditions, the temperature gradient in the vertical direction below the radiant panel is less than 3 ℃/m. Therefore, the radiant panel has high thermal comfort in practical application.