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| 外墙构造状态对墙体界面接触热阻影响分析 |
| Analysis of the Effect of the State of Construction of External Walls on the Contact Thermal Resistance of the Wall Interface |
| 投稿时间：2025-03-27 修订日期：2025-04-29 |
| DOI： |
| 中文关键词: 墙体 界面接触热阻 填充率 温差 热工性能 |
| 英文关键词:wall interface contact thermal resistance fill rate temperature difference thermal performance |
| 基金项目:湖南省自然科学基金(2023JJ40551) |
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| 摘要点击次数: 24 |
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| 中文摘要: |
| 墙体界面接触热阻是影响墙体热工性能的关键因素,但其预测方法及影响因素的研究仍存在不足。通过对墙体综合热阻特性进行分析,提出一种实验测试结合理论计算反推墙体界面接触热阻的方法。利用大型人工环境仓搭建实验墙体热工性能测试平台,研究了黏结材料填充率(0%~100%)和室内外温差(10 ℃~30 ℃)对墙体界面接触热阻的影响规律。研究发现:墙体界面接触热阻随填充率增加呈非线性递减,降幅逐渐趋缓,表现出饱和现象,三种测试工况下墙体界面接触热阻的最低值分别为0.0329 K/W、0.0271 K/W和0.0232 K/W；墙体界面接触热阻与室内外温差呈负相关性,在低填充率区间(φ<50%)内,温差对接触热阻的影响更为显著,其最大降幅为36%。该方法可在黏结材料填充率及不同室内外温差条件下,快速预测墙体界面接触热阻值,为工程模拟提供修正。 |
| 英文摘要: |
| Wall interface contact thermal resistance is a key factor affecting the thermal performance of walls, but the research on its prediction methods and influencing factors is still insufficient. By analysing the comprehensive thermal resistance characteristics of walls, a method of back-propagating the interfacial contact thermal resistance of walls by combining experimental tests with theoretical calculations is proposed. A large-scale artificial environment warehouse was used to build an experimental wall thermal performance test platform, and the influence of the filling rate of bonding materials (0%~100%) and the indoor-outdoor temperature difference (10 ℃~30 ℃) on the interfacial contact thermal resistance of the wall was investigated. It is found that: the wall interface contact thermal resistance decreases nonlinearly with the increase of filling rate, and the rate of decrease tends to slow down gradually, showing the saturation phenomenon, and the lowest values of the wall interface contact thermal resistance under the three test conditions are 0.0329 K/W, 0.0271 K/W and 0.0232 K/W, respectively; the negative correlation between the wall interface contact thermal resistance and the indoor/outdoor temperature difference, and the negative correlation is observed in the low-filling-rate interval ( φ<50%), the effect of temperature difference on contact thermal resistance is more significant, and its maximum reduction is 36%. The method can quickly predict the contact thermal resistance of the wall interface under different filling rates of bonding materials and different indoor and outdoor temperature differences, and provide corrections for engineering simulations. |
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