ABSTRACT

This paper aimed to investigate the temperature dependence of thermal conductivity of heat-treated rubberwood (HTR). Rubberwood specimens were thermally treated at 180°C with three different durations of 15, 25 and 35 h, respectively. Thermal conductivity values of HTR at various mean temperature ranges were then examined. That of untreated rubberwood (UTR) was also measured as a comparison. The result showed that thermal conductivity of UTR and HTR increased with increasing temperature for all durations as a linear relationship in which the values of HTR were lower at all examined temperatures. The rate of change of thermal conductivity with temperature of HTR for durations of 15 and 25 h and UTR was similar (∼0.0004 W/mK/°C). However, rubberwood heat treated for 35 h was much less sensitive to temperature compared with the UTR, showing a relatively small change of thermal conductivity with temperature (∼0.0001 W/mK/°C), which is comparable to typical insulation materials. This indicates that heat treatment could improve the thermal stability of rubberwood subjected to varying temperatures. In view of environmental and energy concerns, HTR should therefore be considered as one of the best potential raw materials for energy efficient building construction.

抽象的

本文旨在研究热处理橡胶木（HTR）的导热系数与温度的关系。橡胶木标本分别在180°C和15、25和35 h的三个不同持续时间下进行热处理。然后检查了HTR在各种平均温度范围内的热导率值。还比较了未经处理的橡胶木（UTR）的木材。结果表明，UTR和HTR的热导率在所有持续时间内均随着温度的升高而增加，呈线性关系，其中在所有检查温度下HTR值均较低。在15小时和25小时以及UTR期间，HTR温度的热导率变化率相似（〜0.0004 W / mK /°C）。但是，与UTR相比，热处理35小时的橡胶木对温度的敏感性要差得多，导热系数随温度的变化相对较小（〜0.0001 W / mK /°C），与典型的绝缘材料相当。这表明热处理可以提高橡胶木在不同温度下的热稳定性。考虑到环境和能源问题，HTR因此应被视为节能建筑的最佳潜在原材料之一。