Thermal and moisture properties of building insulation materials are crucial input parameters for analyzing thermal and moisture transfer phenomena in building environments. Accurate determination of these parameters under different conditions is essential for the correct application and assessment of materials and envelope structures. However, numerous factors influence thermal and moisture properties, and while extensive research has been conducted on this topic, the effects of specimen size on typical thermal and moisture property test values remain unclear. To address the issue of unreliable data caused by random specimen sizes in thermal and moisture property testing of building insulation materials, this study selects three materials—expanded polystyrene (EPS), extruded polystyrene (XPS), and foamed cement—as test subjects to explore the size effects on typical thermal and moisture property test values. The results indicate that specimen size significantly affects the test values for typical thermal and moisture properties, with only a few experiments showing negligible size effects for certain materials. For foamed cement, recommended specimen sizes for thermal conductivity testing using the guarded hot plate method and the transient plane source method are 300 × 300 × 30 mm and 50 × 50 × 30 mm, respectively. Except for equilibrium moisture absorption experiments, the weight of other moisture property tests is generally represented by thickness > planar dimensions.

中文翻译：

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建筑保温材料典型湿热性能测试值的尺寸效应


建筑保温材料的热和湿性能是分析建筑环境中热传递和湿气传递现象的关键输入参数。在不同条件下准确测定这些参数对于正确应用和评估材料和包络结构至关重要。然而，许多因素会影响热性能和湿度特性，虽然已经对该主题进行了广泛的研究，但试样尺寸对典型热性能和湿度性能测试值的影响仍不清楚。为了解决建筑保温材料热湿性能测试中随机试样尺寸导致数据不可靠的问题，本研究选择三种材料——发泡聚苯乙烯 （EPS）、挤塑聚苯乙烯 （XPS） 和泡沫水泥——作为测试对象，探讨尺寸对典型热湿性能测试值的影响。结果表明，试样尺寸会显著影响典型热性能和湿度特性的测试值，只有少数实验表明某些材料的尺寸影响可以忽略不计。对于泡沫水泥，使用保护热板法和瞬态平面源法进行热导率测试的推荐试样尺寸分别为 300 × 300 × 30 毫米和 50 × 50 × 30 毫米。除平衡吸湿实验外，其他水分性能测试的重量一般用厚度 > 平面尺寸表示。