我国建筑墙体保温板的发展状况及对策

介绍了国内常用的几类墙体保温板材的发展状况,据此分析了保温板材存在的不足之处,提出从政策管理和技术革新两个方面来发展我国的保温板材,为相关研究人员和企业提供了参考。

聚苯保温板墙体日光温室性能的研究

聚苯保温板墙体日光温室是一种后墙为10cm聚苯保温板+棉毡的日光温室,近年来在河北省有一些发展。该研究以聚苯保温板墙体日光温室为试材,以土墙日光温室为对照,采用试验分析法,进行越冬番茄栽培,研究温室的气温变化和增温保温性能,以期在河北省设施蔬菜生产上得以推广应用。结果表明:聚苯保温板墙体日光温室与土墙日光温室相比,1—2月日平均气温低0.06～1.68℃,日最高气温高0.45～15.41℃,日最低气温低0.12～1.72℃,平均日最低气温8.88℃。聚苯保温板墙体日光温室蓄热保温性能略低于土墙日光温室,但是具有建造成本低、土地利用率高、白天升温快、无需下挖等特点,能够满足茄果类蔬菜越冬生产的需要,在冀中南地区有较大的推广应用价值。

关于苯板外保温墙体施工的探讨

一、施工准备阶段。1．审查施工图纸，熟悉墙体各部位的构造：明确门、窗洞口、装饰线条、伸缩缝等部位的尺寸、位置、标高等方面的施工技术要求及节点做法。

寒冷地区光伏墙体综合传热特性的数值模拟研究

近年来BIPV项目逐渐增多,对光伏墙体的研究多以光伏组件电热性能为重点,少有结合节能墙体热工性能对不同构造光伏墙体的综合传热特性优化开展的研究。以天津地区为应用场景,分别建立符合天津市居住建筑四步节能设计技术指标的基础墙体、普通光伏墙体和嵌入保温隔热一体化板的新型光伏墙体的传热模型,采用ANSYS FLUENT软件对其温度分布、表面热流密度进行数值模拟,对模拟结果进一步分析获得不同类型墙体的传热系数和光伏组件的电性能。结果表明:较基础墙体,夏季普通光伏墙体内表面得热量可增加46.88%,冬季普通光伏墙体内表面失热量可减少5.47%;新型光伏墙体中的保温隔热层厚度宜不小于20 mm,此时,夏季新型光伏墙体内表面得热量最大可增加18.16%,冬季新型光伏墙体内表面失热量最小可减少20.07%。基于计算结果,寒冷地区的建筑外墙应用光伏组件时,散热构造措施可简化。

Experimental study on axial compressive behaviors of prefabricated composite thermal insulation walls after single-side fire exposure

The axial bearing capacity of prefabricated composite walls composed of inner and outer concrete wythes,expandable polystyrene(EPS)boards and steel sleeve connectors is investigated.An experimental study on the axial bearing capacity of four prefabricated composite walls after fire treatment is carried out.Two of the prefabricated composite walls are normal-temperature specimens,and the others are treated with fire.The damage modes and crack development are observed,and the axial bearing capacity,lateral deformation of the specimens,and the concrete and reinforcing bar strain are tested.The results show that the ultimate bearing capacity of specimens after a fire is less than that of normal-temperature specimens;when the insulation board thicknesses are 40 mm and 60 mm,the decrease amplitudes are 20.8%and 16.8%,respectively.The maximum lateral deformation of specimens after a fire is greater than that of normal-temperature specimens,and under the same level of load,the lateral deformation increases as the insulation board thickness increases.Moreover,the strain values of the concrete and reinforcing bars of specimens after a fire are greater than those of normal-temperature specimens,and the strain values increase as the thickness of insulation board increases.