Study on restraining frost growth at initial stage by hydrophobic coating and hygroscopic coating
Study on restraining frost growth at initial stage by hydrophobic coating and hygroscopic coating
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DOI：
10.1016/j.enbuild.2010.09.012
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发表时间：
2011-05
影响因子：
6.7
通讯作者：
Liang Cai;Rong-han Wang;P. Hou;Xiao-song Zhang
中科院分区：
文献类型：
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作者：
Liang Cai;Rong-han Wang;P. Hou;Xiao-song Zhang
为了寻找抑制霜层生长的有效方法，对普通纯铜、憎水涂层（车蜡涂层）和吸湿涂层（甘油涂层）表面霜层生长过程进行了实验研究。这些过程被摄影记录下来。采用数字图像处理方法对实验图像进行了定量分析。结果表明，疏水涂层和吸湿涂层对结霜初期的生长有明显的影响。与正常铜表面相比，疏水涂层表面和吸湿涂层表面结霜时间较晚，霜层高度较低，分布稀疏，冰晶沉积较少。吸湿涂层厚度对霜高的影响不明显。而吸湿涂层厚度对霜层高度有明显的影响。涂层越厚，对霜层生长的影响越大。因此，疏水涂层和吸湿涂层都能在霜层形成初期抑制霜层的生长，在制冷空调设备换热器中应用疏水涂层和吸湿涂层具有广阔的前景。
For finding an effective method of restraining frost growth, the growing processes of frost on the surfaces of normal copper, hydrophobic coating (car wax coating) and hygroscopic coating (glycerol coating) were studied experimentally. The processes were recorded by photography. The quantitative analysis to the experimental images by digital image processing method was conducted. The results indicate that there is evident effect of hydrophobic coating and hygroscopic coating on frost growth at initial stage. Compared to normal copper surface, frost on the hydrophobic coating surface and on the hygroscopic coating surface appears later with lower frost height, sparse distribution and less aggradations of ice crystals. There is no evident effect of hygroscopic coating thickness on frost height. However, there is evident effect of hygroscopic coating thickness on frost height. The thicker the coating is, the effect on frost growth is bigger. Therefore, frost growth can be restrained by both hydrophobic coating and hygroscopic coating at the initial stage of its formation, and application of hydrophobic coating and hygroscopic coating to heat exchanger in refrigeration and air conditioning equipments would be promising.