空心砖传热方式及填充物对传热的影响研究
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摘要
采用数值软件模拟了空心砖体的传热过程,分析了导热、对流传热及热辐射这3种传热方式对砖体温度分布和热流量的影响,结果表明,砖体内的温度分布受每种传热方式的影响,其中导热和热辐射对传热量的影响较大,对流传热影响最小。并在此基础上,以孔内填充硬聚氨酯泡沫塑料的情形为例,重点探究了采用孔内填充保温材料的措施对空心砖传热过程的影响及热工性能改善的作用,发现该措施能明显改变砖体内部的传热过程,有效地增加砖体热阻。
The numerical software is utilized to simulate the heat transfer process of hollow brick, and the effects of thermal conduction, convection and radiation on the temperature distribution and heat flux of the brick are analyzed. The results show that the temperature distribution of the brick is subject to every heat transfer method. Thermal conduction and radiation influence greatly on the heat flux and the effect of convection is minimal.The effects of holes filled with insulation materials such as polyurethane foam on the heat transfer process and thermal performance of hollow brick are studied. It shows that this measure can significantly change the heat transfer process of brick and increase the thermal resistance of brick effectively.
The numerical software is utilized to simulate the heat transfer process of hollow brick, and the effects of thermal conduction, convection and radiation on the temperature distribution and heat flux of the brick are analyzed. The results show that the temperature distribution of the brick is subject to every heat transfer method. Thermal conduction and radiation influence greatly on the heat flux and the effect of convection is minimal.The effects of holes filled with insulation materials such as polyurethane foam on the heat transfer process and thermal performance of hollow brick are studied. It shows that this measure can significantly change the heat transfer process of brick and increase the thermal resistance of brick effectively.
引文
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[2]胡静.自然气候条件下建筑物供热与室内环境的数值模拟[D].天津:天津大学,2005.
[3]孙继颖.空心砖与建筑[M].北京:中国建筑工业出版社,1988.
[4]李临平,吴志根,李增耀,等.粘土空心砖结构优化的数值模拟[J].工程热物理学报,2008,29(5):845-848.
[5]Jiapeng Sun,Liang Fang. Numerical simulation of concrete hollow bricks by the finite volumemethod[J]. International Journal of Heat and M ass Transfer,2009,52(23):5598-5607.
[6]段双平.孔型和自然对流对空心砌块传热特性的影响研究[J].墙材革新与建筑节能,2012,(6):30-32.
[7]朱文运,胡文,房向阳,等.混凝土小型空心砌块的热阻实验测量及数值分析[J].建筑科学,2014,30(12):49-54.
[8]姚华军.混凝土多排孔保温砖的孔型设计研究[J].建筑砌块与砌块建筑,2014,(4):7-8.
[9]陶文铨.数值传热学[M].西安:西安交通大学出版社,2001.
[10]段中喆. ANSYS FLUENT流体分析与工程实例[M].北京:电子工业出版社,2015:179-180.
[11]胡坤,顾中浩,马海峰. ANSYS CFD疑难问题实例详解[M].北京:人民邮电出版社,2017:154-155.