保温材料中的水会改变保温材料的热性能，从而显著影响管道中的流体和气体流动特性。本文报道了几种常见的管道保温材料，如硅酸钙、多孔玻璃、矿棉、珍珠岩、高温珍珠岩、聚异氰脲酸酯、聚氨酯和气凝胶在不同含水量和试验温度下的吸湿性和导热性。使用改进的瞬态平面源探头测量导热系数。 每个样品都使用水浴浸没法进行长达30天的等温吸水。在每个浸没期后，测量水含量和导热系数。对以下三种含水饱和度水平进行测试:在10°C（50°F）、20°C（68°F）和35°C（95°F）条件下浸泡6小时和30天。根据结果，不同的测试温度似乎对导热系数没有显著影响，而每种材料的含水量显示出显著影响。 还可以看出，材料的吸水特性明显受其细胞结构的影响。例如，粒状和开孔材料吸收的水含量高达379%（按重量计），导热系数增加约262%，而闭孔泡沫吸收的水含量仅为94%（按重量计），导热系数增加约391%。与吸收相对少量水的材料相比，吸收大量水的材料的热导率表现出更线性的增加。 引用:ASHRAE论文:2015年ASHRAE年会，佐治亚州亚特兰大

Water within thermal insulation can significantly affect the fluid and gas flow properties through the pipelines by altering the thermal properties of the insulation material. This paper reports on moisture absorption and thermal conductivity of some common pipeline insulation materials such as calcium silicate, cellular glass, mineral wool, perlite, high temperature perlite, polyisocyanurate, polyurethane, and aerogel at different water contents and test temperatures. The thermal conductivity was measured using a modified transient plane source probe. Each sample underwent isothermal water absorption using water bath submersion for a range of periods up to 30 days. After each submersion period, the water content and thermal conductivity were measured. Testing was performed for the following three water saturation levels: as-received, 6 hours, and 30 days immersion at 10°C (50°F), 20°C (68°F), and 35°C (95°F). Based on the results, the different testing temperatures did not seem to have a significant effect on the thermal conductivity, whereas the water content for each material showed a significant effect. It was also seen that the water absorption characteristics of the materials were clearly influenced by their cellular structure. For example, the granular and open-celled materials absorbed as much as 379% water content by weight with about 262% increase in thermal conductivity, whereas the closed-cell foams absorbed as little as 94% by weight with about 391% increase in thermal conductivity. The materials that absorbed a considerable amount of water showed a more linear increase in thermal conductivity than the materials that absorbed a relatively small amount.