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Thermal conductivity of lofty nonwovens in space and planetary vacuum environment

机译：太空和行星真空环境中崇高非织造布的导热系数

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摘要

For planetary exploration, new thermal insulation materials are needed to deal with unique environmental conditions presented to extravehicular activity (EVA). The thermal insulation material and system used in the existing space suit were specifically designed for low orbit environment. They are not adequate for low vacuum condition commonly found in planetary environments with a gas atmosphere. This study attempts to identify the types of lofty nonwoven thermal insulation materials and the construction parameters that yield the best performance for such application. Lofty nonwovens with different construction parameters are evaluated for their thermal conductivity performance. Three different types of fiber material: solid round fiber, hollow fiber, and grooved fiber, with various denier, needling intensity, and web density were evaluated. They were tested in three different vacuum conditions: low orbit high vacuum (10-5torr), intermediate vacuum (10-3torr), and Mars atmosphere low vacuum (8 torr), using the guarded-hot-plate method. The performance of the materials was correlated with each construction parameter. The results show that the grooved fiber material is the best insulation material among the three types of fiber tested. The geometry of the grooved fiber lengthens the path for heat transfer and lowers the thermal conductivity of the material. More testing and data are needed in order to validate the trend to relate the thermal conductivity performance of the materials to the fiber size, needle intensity, and web density of the materials.
机译：对于行星勘探，需要新的隔热材料来处理呈现给素质活动（EVA）的独特环境条件。现有空间套装中使用的隔热材料和系统专为低轨道环境设计。它们不适合具有气氛气氛的行星环境中常见的低真空条件。本研究试图识别崇高无纺热绝缘材料的类型和施工参数，从而产生这种应用的最佳性能。评估具有不同施工参数的崇高非织造织物进行导热性能。三种不同类型的纤维材料：固体圆形纤维，中空纤维和带槽纤维，具有各种旦尼尔，针刺强度和幅材密度。它们在三种不同的真空条件下测试：低轨道高真空（10-5托），中间真空（10-3Torr）和MARS气氛低真空（8托），使用防护热板法。材料的性能与每个结构参数相关。结果表明，沟槽纤维材料是测试三种类型的最佳绝缘材料。凹槽光纤的几何形状延长了热传递的路径，并降低了材料的导热率。需要进行更多的测试和数据，以验证趋势以将材料的导热性性能与材料的纤维尺寸，针强度和幅材密度相关联。

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