冷面霜层生长过程及其抑制对策实验研究  

Experimental Study on Growth Process and Inhibition of Cold Frost

作　　者：董涛 夏鹏[1] DONG Tao;XIA Peng(School of Mechanical Engineering,Shanghai University of Engineering Science,Shanghai,201620,China)

机构地区：[1]上海工程技术大学机械工程学院,上海201620

出　　处：《轻工机械》2018年第4期44-47,共4页Light Industry Machinery

摘　　要：针对目前制冷设备在制冷过程中易结霜导致蒸发器外侧的换热热阻增加,传热系数降低等问题,课题组进行了憎水性抑霜涂层的研究。设计了采用半导体制冷方式的试验装置,通过与温度传感器连接的温控器来控制并实时测量冷表面温度,采用体视显微镜对结霜过程进行观测并测量出霜层在每个时刻的厚度变化,并在显微镜上连接CCD摄像头,将放大的图片通过视频电缆传输到计算机。对比实验表明:憎水性表面能有效延缓霜晶的形成,且在一定时间范围内,憎水性表面霜层的厚度始终小于普通铝表面。同时,运用热力学理论分析了憎水性表面霜层生长较慢的原因,当接触角达到极限180°时,冰晶就不能粘附在冷表面上。因此憎水性涂层能够有效抑制霜层的生长。Aiming at the refrigeration equipment current problems of frosting phenomenon,heat resistance increasing and heat transfer coefficient decreasing outside the evaporator the study of hydrophobic defrosting coating was carried out.The research group designed the test device with semiconductor refrigeration, measured the temperature by the temperature controller connected with temperature sensor and real-time measurement of cold surface temperature,observed and measured the frost thickness changes at each time of the frosting process by stereo microscope,connected CCD camera to the microscope,magnified picture cable was transmitted to the computer. The comparison experiments show that the hydrophobic coat can effectively delay the formation of frost,and the hydrophobic coat frost thickness is always lower than aluminum surface in a certain period of time. The reason why the frost layer grows slowly on the hydrophobic coat is analyzed by thermodynamic theory,and when the contact angle reaches 180° limit,ice crystals cannot adhere to the cold surface. So the hydrophobic coat can effectively restrain the growth of frost.

关 键 词：制冷系统 结霜 憎水性表面 抑制结霜 霜高生长 

分 类 号：TB61[一般工业技术—制冷工程]