【摘要】 沿海地区和岛屿上的建筑玻璃不仅暴露在海洋的热湿环境中，而且受到盐分的沉积和侵蚀，其表面对流换热系数将发生变化。本文以市场上常用的中空Low-E为研究对象，通过加速盐雾试验的方法探究了影响其沉积特征的关键因素，然后在气候风洞内采用直接热平衡法测试了盐分沉积后玻璃试件的表面对流换热系数，并拟合了其与单位面积沉积量之间的函数关系。结果表明，随着喷雾时间变长，玻璃表面的盐斑分布均匀性有所下降，但其尺寸与覆盖面积存在明显的增长趋势，盐水浓度变化不影响其时变规律。不同盐水浓度下，玻璃表面单位面积沉积量与喷雾时间均呈现对数函数关系，但高浓度对应的单位面积沉积量大于低浓度工况，平均增幅为11.6%。随着玻璃表面盐分沉积量增加，其内外表面温度降低，盐分沉积产生的表面附加热阻极小。外、内表面热流亦呈现单调递减趋势，分别衰减为无盐工况的40.3%和40.6%。对流换热系数随沉积量增加呈单调增长趋势，并与单位面积沉积量成线性函数关系，与无盐情况相比，其最大增幅达178.7%。更多还原

【Abstract】 Building glasses in coastal areas and islands are not only exposed to the hydrothermal marine environment, but also subject to salt deposition and erosion, leading to a change in their surface convective heat transfer coefficient. This study took hollow Low-E glass commonly used in the market as the research object, the key factors affecting the salt deposition characteristics were investigated through an accelerated salt spray test. Then, the surface convective heat transfer coefficient of the glass specimens with salt deposition was measured by the direct heat balance method in a climate wind tunnel, and the function relationship between the coefficient and salt deposition per unit area was determined. The results show that the distribution uniformity on the glass surface drops with increasing spray time, but the size of salt spots and coverage area increases significantly, and the change of salt concentration does not affect the time-dependent law. In different salt concentrations, the salt deposition per unit area and spray time show a logarithmic function relationship, but the salt deposition per unit area of high concentration is larger than that of low concentration, with an average increase of 11.6%. With the increase of salt deposition on the glass surface, the interior and exterior surface temperatures drop, and the surface thermal resistance generated by salt deposition is quite small. The heat fluxes on the exterior and interior surfaces also exhibit a monotonically decreasing trend, which attenuates to 40.3% and 40.6% of the salt-free condition, respectively. The convective heat transfer coefficient increases monotonically with the increase of deposition amount, and it is a linear function with the salt deposition per unit area, and the maximum increase reaches 178.7% compared with the salt-free condition.更多还原