文档介绍：中国工程热物理学会传热传质学
学术会议论文编号:123295
相变屋顶非稳态传热特性及影响因素分析
吴国忠1,王晶1,李栋*,1,2,白浩然1,赵岩2
(1. 东北石油大学土木建筑工程学院,黑龙江大庆,163318;2. 哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨,150001)
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摘要:结合大庆地区夏季气候特征,考虑太阳辐射的直接影响,对普通屋顶、隔热屋顶和相变屋顶传热过程进行非稳态数值模拟,分析太阳辐射强度、相变温度、相变潜热、屋顶坡度、多孔介质骨架物性等因素对相变屋顶隔热特性的影响,并得出了以下主要结论:相变材料可以显著增强屋顶结构对室外空气综合温度的衰减作用及延迟效果,但对屋顶结构降温隔热效果的提升作用相对有限。
关键词:相变屋顶;传热特性;太阳辐射;影响因素;非稳态
Unsteady Heat transfer Characteristics and Influence Factors of Phase Change Roof
Wu Guozhong1, Wang Jing1, Li Dong*,1,2, Lin Lin1, Zhao Yan2
(1: School of Architecture and Civil Engineering, Northeast Petroleum University, Daqing 163318, China;2: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract:Under summer climatic features of Daqing area, the unsteady numerical simulation of the heat-transfer process mon roof, insulation roof and phase change roof were proceeded, with the considering of direct influence of solar radiation. The various influencing factors of solar radiation intensity, transformation temperature, transformation latent heat, slope of roof and property of porous medium framework to thermal insulation performance of phase transition roof were analyzed in this results show that, phase change material can observably improve the attenuation multiple and delay time of outside prehensive temperature on roof structure, while the promotion effect on thermal insulation performance of roof structure is relative finite.
Key words:phase change roof; heat transfer characteristics; solar radiation; influencing factors; unsteady
0 引言资助项目:黑龙江省教育厅科研项目(12511024)
*通讯作者:李栋(1979-)男,讲师,在读博士,主要从事室内热环境分析及CFD仿真研究。
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随着经济发展、人民生活水平的提高及城市化、现代化进展的加快,能源的需求不断增大,建筑能耗占国民经济总能耗的比例越来越大,目前已接近28%,而优良的围护结构隔热技术是降低室内热环境能耗的关键。在大多数建筑中,屋顶虽然是建筑物外围护结构表面所占面积较小的部分,但由于其直接接收太阳辐射,其传热量往往大于任何一面外墙,因此研究其隔热机理对降低建筑能耗,发展绿色生态建筑有着尤为重要的意义。
相变材料能在很小的温度范围内储存释放大量的相变潜热,具有良好的蓄能能力和调温性能,目前许多学者开始研究相变材料在建筑隔热结构中的应用[1