电站地下厂房通风空调系统从2007年投入运行后，蜗壳层、水轮机层的管路结露严重。对电站运行工况进行了长期连续测试，结果表明：4—6月，结露现象较普遍，水管壁面温度低于环境空气的露点温度；7—8月，水管壁面温度高于环境空气的露点温度，结露现象基本消失。提出了具体的防结露措施：采用难燃型橡塑保温材料对部分管路进行保温；同时，根据季节选择适当的通风量，合理设计气流组织，相应开启不同数量的冷冻除湿机。%Since the operation of ventilation and air conditioning system of underground plants in 2007,the moisture condensation phenomenon occurs seriously on the pipeline.Performs the long-term and continuous test for operation condition of hydropower station.The result shows that condensation occurs commonly when surface temperature of water tube is lower than dew-point temperature of the ambient air from April to June,while this phenomenon vanishes basically from July to August since the surface temperature of water tube is higher than dew-point temperature of ambient air.Presents the following detailed anti-condensation measures, including performing the insulation on part of tubes with nonflammable material,selecting appropriate ventilation rate according to seasons,designing reasonable air distribution,and operating different numbers of refrigeration dehumidification machines.
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