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    梁善庆, 李思程, 柴媛, 傅峰. 内置电热层实木复合地板表面温度变化规律及模拟[J]. 北京林业大学学报, 2018, 40(11): 112-122. DOI: 10.13332/j.1000-1522.20180253
    引用本文: 梁善庆, 李思程, 柴媛, 傅峰. 内置电热层实木复合地板表面温度变化规律及模拟[J]. 北京林业大学学报, 2018, 40(11): 112-122. DOI: 10.13332/j.1000-1522.20180253
    Liang Shanqing, Li Sicheng, Chai Yuan, Fu Feng. Change law and simulation of surface temperature for electric heating engineered wood flooring with built-in electrothermal layer[J]. Journal of Beijing Forestry University, 2018, 40(11): 112-122. DOI: 10.13332/j.1000-1522.20180253
    Citation: Liang Shanqing, Li Sicheng, Chai Yuan, Fu Feng. Change law and simulation of surface temperature for electric heating engineered wood flooring with built-in electrothermal layer[J]. Journal of Beijing Forestry University, 2018, 40(11): 112-122. DOI: 10.13332/j.1000-1522.20180253

    内置电热层实木复合地板表面温度变化规律及模拟

    Change law and simulation of surface temperature for electric heating engineered wood flooring with built-in electrothermal layer

    • 摘要:
      目的研究不同电热层位置和不同结构的电热实木复合地板温度变化规律,为电热实木复合地板的电热性能及结构优化提供理论参考。
      方法采用碳纤维纸作为发热元件,通过热压方式制备具有电热功能的实木复合地板,测试了通电荷载后时间-温度效应、温度不均匀度、电-热辐射转换效率和表面网格温度,分析不同电热层位置对表面温度、温度不均匀度和电-热辐射转换效率的影响,模拟了表面温度二维和三维分布图,探讨不同结构电热实木复合地板正面和背面温度变化规律,拟合了时间-温度变化曲线幂函数方程。
      结果表面温度均随通电荷载时间的增加而增加,最终趋于稳定,切断电源以后,温度快速下降直至与环境温度平衡。随电热层位置下移,发热稳定后表面温度随之降低,电-热辐射转换效率也相应降低。功率密度为200、300、400和500 W/m2,电热层位于近表层时,表面温度比底层温度分别高了17.2%、21.8%、24.8%和26.8%。随功率密度的增加,温度不均匀度增加,电-热辐射转换效率也随之增加,功率密度达到500 W/m2时,电热层位于近表层的电-热辐射转换效率达95.6%。二维和三维模拟图表明:表面温度分布总体呈中间高、四周低趋势,电热层位于表层尤为明显且存在聚热现象。不同结构电热实木复合地板正面表面温度随通电荷载时间增加而增加,背面木材厚度越厚,正面表面温度越高,反之背面温度越低,拟合方程表明时间-温度变化呈幂函数关系,决定系数最高达0.999 9。
      结论电热层位置和地板结构对电热实木复合地板表面温度和电-热辐射转换效率影响显著,电热层位于近表层时更有利于电热性能改善。

       

      Abstract:
      ObjectiveThe temperature variation characteristics of electric heating engineered wood flooring (EHEWF) with different electrothermal layer positions and different structures were investigated in this study, which provides theoretical reference for electrothermal performance and structure optimization of EHEWF.
      MethodCarbon fiber paper was used as heating element to manufactured EHEWF by hot pressing method. The time-temperature effect, temperature unevenness, electric-to-radiant power transfer efficiency and surface grid temperature were investigated and analyzed after heating, also simulated the two-dimensional and three-dimensional distribution of surface temperature. The front and back surface temperature rise law of different structure EHEWF were explored and fitted power-function equation of time-temperature curves.
      ResultThe results showed that the surface temperature increased with the increase of conductive time, and finally stabilized. After the power was cut off, the temperature began to decrease rapidly until it was in equilibrium with the ambient temperature. As the position of electrothermal layer moved down, the surface temperature decreased after heating stabilized, the electric-to-radiant power transfer efficiency was also reduced accordingly. When the power density was respectively 200, 300, 400 and 500 W/m2, the surface temperature of electrothermal layer locating near surface layer was 17.2%, 21.8%, 24.8% and 26.8% higher than the bottom layer. With the increase of power density, the temperature unevenness and electric-to-radiant power transfer efficiency also increased, the electric-to-radiant power transfer efficiency of electrothermal layer locating near surface layer was 95.6% as power density 500 W/m2. Two-dimensional and three-dimensional simulation showed that the overall trend of surface temperature distribution was middle higher than periphery. The temperature trend was especially prominent for electrothermal layer locating surface layer and there was a phenomenon of heat accumulation. The front surface temperature of different structural EHEWF increased with the increase of the load time. The thicker the back surface wood was, the higher the front surface temperature was, and the lower the back temperature was. The fitting equation showed that the time-temperature change was power function, and coefficient of determination was up to 0.999 9.
      ConclusionThe electrothermal layer location and floor structure have significant effects on the surface temperature and electric-to-radiant power transfer efficiency. When the electrothermal layer is located near the surface layer, it is more beneficial to improve the electrothermal performance.

       

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