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Experimental Assessment of Thermal Performance and Bridging Effects of Low-Cost Sandwich Panels under a High-Temperature Impinging Jet

機(jī)譯：高溫撞擊噴射下低成本夾心板的熱性能和橋接效果的實驗評價

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Sandwich panels are commonly used across industries for their ability to bear structural and thermal loads. In this paper, a panel chamber matching apparatus was designed to investigate the thermal performance of eight steel-based panels by exposing them to an impinging jet at approximately 550 °C for 30 min. Three types of low-cost materials (polycrystalline filaments, silica aerogel, and aluminum silicate) were used as the insulation core. The temperature of the panel surfaces was measured, as well as the metallic fasteners, including bolts, nails, battens, seams, and angle iron, to examine their thermal bridge effects. Major conclusions include the following: first, the maximum temperature on the impinged surface was consistent among all 20 cases, whereas that of the surface under free convection varied, ranging from 41 to 120 °C, depending on the core and thermal bridges. Second, most of the highest temperatures on opposite surfaces were caused by a section of bare angle iron, and this bridging effect could be significantly reduced by up to 50 °C using a few layers of cloth, although the improvement could be temporary. Bolts and nails were less effective as thermal bridges, while the battens could be more effective. Third, the estimated heat flux of all specimens ranged from 167 to 331 W·m?2.
機(jī)譯：三明治面板通常用于跨行業(yè)，以實現(xiàn)結(jié)構(gòu)和熱負(fù)荷的能力。在本文中，設(shè)計了一種面板室匹配裝置，用于通過將其暴露于大約550℃的撞擊射流30分鐘來研究八鋼基面板的熱性能。使用三種類型的低成本材料（多晶絲，二氧化硅氣凝膠和鋁硅酸鋁）作為絕緣核心。測量面板表面的溫度，以及金屬緊固件，包括螺栓，釘子，板條，接縫和角鐵，以檢查它們的熱橋效果。主要結(jié)論包括以下內(nèi)容：首先，撞擊表面上的最高溫度在所有20例中都是一致的，而自由流對流的表面的變化范圍為41至120°C，取決于芯和熱橋。其次，相對表面上的大多數(shù)最高溫度是由一段裸角鐵引起的，并且這種橋接效果可以使用幾層布明顯減少50°C，盡管改善可能是暫時的。螺栓和指甲的螺栓和釘子效果效果較低，而巴格可能更有效。第三，所有試樣的估計熱通量范圍為167至331W·m-2。

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