木基电热材料电热性能分析及板面温度模拟
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摘要
为了提高木质材料的导热性能,获得一种板面温度分布均匀、节能降耗的地面采暖材料,选取木质材料为基材,碳素材料为导热材料,采用碳纳米技术和人造板技术相结合的工艺制备木基电热材料,并对其电热性能和板面温度进行分析和模拟。研究分析了碳素材料的涂覆形式、功率对木基电热材料的电热性能和板面温度的影响,并借助fluent软件模拟木基电热材料板面温度均匀性以及板面升温的情况,并对模拟数据与实测数据进行了对比分析。结果表明:在相同功率情况下,不同涂覆形式碳素材料发热情况不相同,碳素材料S型涂覆的电热材料发热性能最好,板面温度分布较均匀;不同功率情况下,通电15 min左右材料表面温度均达到35℃以上,所以优选碳素材料S型涂覆形式作为电热材料的内置发热层形式。在此基础上,采用Fluent软件对木基电热材料板面的升温过程的动态仿真进行了模拟,且模拟仿真结果与试验测试数据差值百分比在5%以内,所以仿真模型是有效的。
In order to improve the thermal conductivity of woody materials, get ground heating materials with uniform temperature distribution and energy saving. Wood materials are taken as The base material and carbon materials are used as the thermal conductivity materials. Wood-based electric thermsl materials were prepared by carbon nano-technology and wood-based panel technology, and their electric thermal properties and surface temperature were analyzed and simulated. In the study, we analyzed the influence of the coating form and power of the material on the electric thermal properties and surface temperature. The fluent software was used to simulate the temperature uniformity and temperature rise. The simulation data and measured data were compared. The results show that the thermal conditions of carbon materials with different coating forms are different under the same power. The thermal properties of carbon material S-coated electric thertal material are the best, and the surface temperature distribution is more uniform. Under different power conditions, The surface temperature of all materials is above 35 ℃, so S-coated of carbon material is preferred as the built-in heating layer in the form of electric thermal material. On this basis, Fluent software was used to simulate the dynamic simulation of heating process, and the difference between simulation results and experimental test data was less than 5%, so the simulation model was effective.
In order to improve the thermal conductivity of woody materials, get ground heating materials with uniform temperature distribution and energy saving. Wood materials are taken as The base material and carbon materials are used as the thermal conductivity materials. Wood-based electric thermsl materials were prepared by carbon nano-technology and wood-based panel technology, and their electric thermal properties and surface temperature were analyzed and simulated. In the study, we analyzed the influence of the coating form and power of the material on the electric thermal properties and surface temperature. The fluent software was used to simulate the temperature uniformity and temperature rise. The simulation data and measured data were compared. The results show that the thermal conditions of carbon materials with different coating forms are different under the same power. The thermal properties of carbon material S-coated electric thertal material are the best, and the surface temperature distribution is more uniform. Under different power conditions, The surface temperature of all materials is above 35 ℃, so S-coated of carbon material is preferred as the built-in heating layer in the form of electric thermal material. On this basis, Fluent software was used to simulate the dynamic simulation of heating process, and the difference between simulation results and experimental test data was less than 5%, so the simulation model was effective.
引文
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[3]李平,周成学,陈锐,等.碳纤维材料在发热体方面的应用与开发[J].碳素,1999(2):24-25.
[4]贺福,赵建国.炭纤维的电热性能及其应用[J].新型碳材料,1995(3):5-10.
[5]李焰,夏金童,邵浩明,等.炭/陶复合材料电热性能的研究[J].航空材料学报,2006,26(2):57-62.
[6]刘开琪,许胜西,李林.树脂结合陶瓷/炭复合耐火材料的导电机理[J]耐火材料,1999,33(3):127-129.
[7]Liu K Q.Study on ceramic carbon conductive refractory composites[J].The Third International Symposium on Refractories,Beijing,1998(12):310-304.
[8]Windhorst T,Blount.Carbon-carbon composites:a summary of recent developments and applications[J].Materials and Design,1997,18(l):11-1.
[9]Kim T,Chung DDL.Carbon fiber mats as resistive heating elements[J].Carbon,2003,41(12):2436-2440.
[10]Chen B,Wu K R,Yao W.Characteristics of resistivitytemperature for carbon fiber reinforced concrete[J].Wuhan University of Technology,2006,21(l):121-24.
[11]Chung DDL.Review:Electrical applications of carbon materials[J].Journal of Materials Science,2004,39(8):2645-2661.
[12]Yang C Q,Wu Z S,Huang H.Electrical Properties of different types of carbon fiber reinforced plastics(CFRPs)and hybrid CFRPs[J].Carbon,2007,45(15):3027-3035.
[13]Wang S,Chung DDL.Temperature/light sensing using carbon fiber Polymer matrix composite[J].Composites Part B:Engineering,1999,30(6):591-601.
[14]PHAM TUONG LAM,王新洲,邓玉和.蒙脱土改性杨木板材的工艺研究I:浸渍改性处理工艺[J].中南林业科技大学学报,2016,36(4):95-102.
[15]Fosbury A,Wang S,Pin YF,et al.The inter-laminar interface of a carbon fiber Polymer matrix composite as a resistance heating element[J].Composites Part A:Applied Science and Manufacturing,2003,34(10):933-940.