高孔洞率复合保温砌块设计及热工性能影响因素
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摘要
提出了高孔洞率复合保温砌块孔型的设计方法,同时采用ABAQUS有限元软件进行数值模拟,分析了复合保温砌块的孔型排布、孔洞率和材料导热系数对其热工性能的影响.结果表明:复合保温砌块的热阻随孔洞率的提高而增加,随实体材料导热系数的降低而增加,随填充的保温材料导热系数的降低而增加;通过数值模拟计算,得到了复合保温砌块热阻与孔洞率、实体材料导热系数、保温材料导热系数的关系公式;在灰缝对墙体传热影响很小的情况下,当砌块孔洞率为60%时,240mm厚单一砌块墙体的传热系数能达到0.29W/(m2·K),满足砌块和墙体热工性能大幅提升的需求.
A method for designing high porosity composite insulation block was proposed.The numerical simulation of composite insulation block was carried out by using ABAQUS finite element software.The influence of pore configuration,porosity and thermal conductivity of materials on the thermal performance of the composite insulation block was studied.The results show that the thermal resistance of the composite insulation block increases with increase of porosity,decrease of thermal conductivity of the matrix material and filled thermal insulation materials.Through numerical simulation,the relation formulas between the thermal resistance of composite insulation block and porosity,thermal conductivity of the matrix materials,filled thermal insulation materials were obtained.In the case that the mortar joint has little effect on heat transfer of wall,when the porosity of the block is 60%,the heat transfer coefficient of 240 mm thickness single block wall can reach 0.29 W/(m2·K),it can meet the demand of substantial improvement of the thermal performance of block and wall.
A method for designing high porosity composite insulation block was proposed.The numerical simulation of composite insulation block was carried out by using ABAQUS finite element software.The influence of pore configuration,porosity and thermal conductivity of materials on the thermal performance of the composite insulation block was studied.The results show that the thermal resistance of the composite insulation block increases with increase of porosity,decrease of thermal conductivity of the matrix material and filled thermal insulation materials.Through numerical simulation,the relation formulas between the thermal resistance of composite insulation block and porosity,thermal conductivity of the matrix materials,filled thermal insulation materials were obtained.In the case that the mortar joint has little effect on heat transfer of wall,when the porosity of the block is 60%,the heat transfer coefficient of 240 mm thickness single block wall can reach 0.29 W/(m2·K),it can meet the demand of substantial improvement of the thermal performance of block and wall.
引文
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[2] ZACH J,NOVK V.Study of the use of vacuum insulation as integrated thermal insulation in ceramic masonry blocks[J].Procedia Engineering,2016,151:206-213.
[3]于献青,张国永.烧结复合保温砌块的研制和工程应用[J].墙材革新与建筑节能,2016(6):35-38.YU Xianqing,ZHANG Guoyong.Development and engineering application of sintered composite insulation block[J].Wall Materials Innovation and Building Energy Saving,2016(6):35-38.(in Chinese)
[4]孙孟琪,蹇守卫,何桂海,等.烧结保温砌块孔结构参数的数值模拟与优化设计[J].砖瓦,2015(5):8-12.SUN Mengqi,JIAN Shouwei,HE Guihai,et al.Numerical simulation and optimization design on the pore structure parameters of fired insulation block[J].Brick&Tile,2015(5):8-12.(in Chinese)
[5]浮广明,宋方方,宋心,等.基于ANSYS的烧结保温空心砌块孔型优化设计研究[J].砖瓦,2017(10):12-18.FU Guangming,SONG Fangfang,SONG Xin,et al.Research on optimum design of hollow block of sintered heat insulation block based on ANSYS[J].Brick&Tile,2017(10):12-18.(in Chinese)
[6]张国永,王立,刘亚辉,等.烧结复合保温砌块热工性能数值模拟研究[J].新型建筑材料,2016(11):39-41.ZHANG Guoyong,WANG Li,LIU Yahui,et al.Numerical simulation on thermal property of fired composited insulation block[J].New Building Materials,2016(11):39-41.(in Chinese)
[7]石亦平,周玉蓉.ABAQUS有限元分析实例详解[M].北京:机械工业出版社,2006:1-63.SHI Yiping,ZHOU Yurong.Detailed solution of ABAQUS finite element analysis examples[M].Beijing:Machinery Industry Press,2006:1-63.(in Chinese)
[8]张万仓,金立虎,张文涛.混凝土空心砌块与混凝土砖实用手册[M].北京:中国建材出版社,2007:226-231.ZHANG Wancang,JIN Lihu,ZHANG Wentao.Practical handbook for concrete hollow block and concrete brick[M].Beijing:China Building Materials Press,2007:226-231.(in Chinese)