ABSTRACT

For the development of functional honeycomb plates (FHPs) and efficient resource utilization of straw, based on the measurement of the equivalent thermal conductivity (λ_E) of paper honeycomb plates (HPs) and FHPs, including straw-core paper honeycomb plates (SHPs), under cold-left and hot-right conditions, the influence mechanism of the system geometry parameters on the convective heat transfer of HPs and the heat insulation performance of FHPs by fillers are discussed. The results are as follows. 1) Compared with the case of hot-above and cold-below conditions, the convective heat transfer ratio of HP increases substantially under cold-left and hot-right conditions. 2) The main heat transfer modes of the FHPs are radiative heat transfer between the wall (including the panel and side) and filling material and solid heat conduction in the filling material, supplemented by a small amount of heat conduction through air or local convection heat transfer in the void. 3) The higher the temperature is, the greater the FHP equivalent thermal conductivity, with little influence from the heat transfer direction. 4) It is relatively conservative to use the heat transfer effect of HPs and FHPs to evaluate that of beetle elytron plates (BEPs) and functional beetle elytron plates (FBEPs). This study lays a foundation for the application of multifunctional BEPs and HPs in building envelopes.

摘要

为了开发功能性蜂窝板 (FHP) 和高效利用秸秆资源，基于等效热导率 (λ _E) 纸蜂窝板 (HPs) 和 FHPs，包括稻草芯纸蜂窝板 (SHPs)，在冷左和热右条件下，系统几何参数对 HPs 对流换热和热量的影响机制讨论了填料对 FHPs 的绝缘性能。结果如下。1）与上热下冷工况相比，左冷和右热工况下HP的对流传热比显着增加。2）FHPs的主要传热方式为墙体（包括面板和侧面）与填充材料之间的辐射传热和填充材料中的固体热传导，辅以少量通过空气的热传导或局部对流热在虚空中转移。3）温度越高，FHP等效导热系数越大，受传热方向的影响越小。4）用HPs和FHPs的传热效应来评价甲虫elytron板（BEPs）和功能性甲虫elytron板（FBEPs）是相对保守的。本研究为多功能 BEP 和 HP 在建筑围护结构中的应用奠定了基础。