冷水机组末端风盘用铜管和不锈钢管的管内侧加速结垢对比OA

In order to evaluate the anti-fouling potential in fan coils of chillers by replacing the copper tubes with stainless-steel tubes,an experimental rig of accelerated fouling test in the inner sides of tubes is designed and established,and the fouling differences among a cooper smooth tube,a stainless-steel smooth tube and a stainless-steel tube with inner riblets are comparatively investigated.Testing conditions cover the inlet water velocity of 1.2 m/s,the suspension mass concentration of 800 mg/L,and the inlet water temperature of 10 ℃ and 60 ℃.The results show that,the fouling mass in the cooper smooth tube is the largest,which is respectively 39.1%and 48.2%higher than that in the stainless-steel smooth tube and the stainless-steel tube with inner riblets under the cooling condition of chiller,and is respectively 51.4%and 88.9%higher than that in the stainless-steel smooth tube and the stainless-steel tube with inner riblets under the heating condition of chiller.The surface free energy of copper smooth tube is greater than those of stainless-steel tubes,which means that the fouling particulates are more prone to deposit on the copper smooth tube.The crystal forms of fouling layer in the copper smooth tube,the stainless steel smooth tube and the stainless steel tube with inner riblets respectively present as the dense lamellar shape,the large crystal cluster shape and the small crystal cluster shape,which means that the fouling layer on the surface of copper smooth tube is more difficult to remove than that of stainless steel tubes,and the existence of internal riblets can destroy the stability of fouling layer on the surface of stainless steel tubes.