Weatherability Studies on External Insulation Thermal System of Expanded Polystyrene Board,Polystyrene Granule and Polyurethane Foam

Atmospheric exposure tests including two experimental stages of high temperature-spraying water cycle and heating-refrigeration cycle were carried out on three currently used ETIS of expanded polystyrene（EPS） board,polystyrene granule mortar and polyurethane foam in order to study the weatherablility of external thermal insulation system（ETIS）.The change rules of adhesive strength were hereby studied at different time period of atmospheric exposure tests.The experimental results show that the adhesive strength of three kinds of ETIS changes a little during high temperature-spraying water cycle,but the adhesive strength of ETIS with EPS board decreases significantly after heating-refrigeration cycle.The lowering rate of adhesive strength with painting finishes is obviously faster than that of tile finishes for ETIS of EPS board during heating-refrigeration cycle.The weatherability of ETIS with EPS board is worse than the other two,and ETIS of polystyrene granule mortar and polyurethane foam are more suitable than ETIS of EPS board in cold area.

Impact of light-weight external thermal insulation materials on building surrounding thermal environment in summer

The method for calculating wall surface heat storage coefficient was introduced,and the coefficients of several common walls with light-weight external thermal insulation materials and the traditional solid clay brick wall were calculated.In order to study the impact of light-weight external thermal insulation materials,a contrasting experiment was carried out between an external insulated room and an uninsulated room in August,2010,in Chongqing,China.The result shows that outside surface heat storage coefficient of the insulated wall is much less than that of the traditional wall.However,during sunny time,the surface temperature of external walls of the insulated room is obviously higher than that of the uninsulated room.In different orientations,due to different amounts of solar radiation and being irradiated in different time,the contrasting temperature difference(CTD) appears different regularity.In a word,using light-weight external thermal insulation materials has a negative impact on building surrounding thermal environment and people's health.Finally,some suggestions on how to eliminate the impact,such as improving the surface condition of the building envelop,and plating vertical greening,are put forward.

THERMAL EFFECTS OF BUILDING′S EXTERNAL SURFACES IN CITY——Characteristics of Heat Flux into and out of External Wall Surfaces

This study examined the thermal effects of building′s external wall surfaces, using observational data of spatial-temporal distribution of surface temperature, air temperature, and heat flux into and out of external surface. Results indicate that external wall surface temperature and nearby air temperature vary with the change of orientation, height and season. In general, the external wall surface temperature is lower near the ground, and is higher near the roof, than nearby air temperature. But north wall surface temperature is mostly lower than nearby air temperature at the same height; south wall surface temperature during the daytime in December, and west wall surface temperature all day in August, is respectively higher than nearby air temperature. The heat fluxes into and out of external wall surfaces show the differences that exist in the various orientations, heights and seasons. In December, south wall surface at the lower sites emits heat and north wall surface at the higher sites absorbs heat. In April, all external wall surfaces, emit heat near the ground and absorb heat near the roof. In August, west wall surface all day emits heat, and other wall surfaces just show the commensurate behavior with that in April.

Finite Element Analysis of External Thermal Insulation Composite System:Thin Rendered Expanded Polystyrene Board

The finite element model of an external thermal composite insuiation system, thin rendered expanded polystyrene （ EPS ） board, was built with ANSYS 1.0, which had two forms： one with window and one without window. The finite element analysis results show that the EPS board had very good insulation capacity at both high or low temperature, stress concentration was produced in the center of wall and around window, and the maximum deformation was observed at the edge of board and the minimum deformation was in the center.

Advanced Deterioration Diagnosis Model for Building External Wall Tiles

In 1981 Taiwan entered a period of intense construction, meaning that today many buildings are more than 30 years old. Lack of maintenance has led to frequent safety incidents involving external walls. This study focuses on a deterioration diagnostic model for external wall tiles of aged buildings, using both stage 1 and stage 2 diagnostic methods. The visual test results are categorized based on impact on public safety, and renovation strategies are proposed. Stage 1 diagnosis mainly adopted the DER visual inspection deterioration assessment method. For enhance the accuracy, this research adopted the Infrared Thermal Imaging detection method to double confirm the visual inspection results. After producing an external wall tile Condition Indicator (CI). For stage 1 diagnostic results that fall in a gray area, stage 2 diagnosis was carried out using a tap tone test, followed by fast Fourier transform and pattern recognition to analyze the tapping results. Finally, the study provides a deterioration evaluation criteria for external wall tiles replacement recommendations and a standard operating procedure for deterioration diagnosis. The study also recommends directions for future amendment of regulations, and provides a basis of reference for the government in determining urban renewal, renovation and maintenance strategies.

外墙保温一体化系统黏结性能影响因素及机理研究

外墙保温系统是建筑节能的主要路径之一,建筑外墙保温一体化系统是目前上海市主流应用的外墙保温系统。基于外墙保温一体化系统应用现状,分析了不同类型界面处理剂,不同施工环境条件和拉拔尺寸等因素对外墙保温一体化系统黏结性能的影响规律。研究成果对促进外墙保温一体化系统性能提升、保障建筑外立面安全具有指导意义。

预制内外复合保温模壳拼装墙体热工性能研究

为探究预制内外复合保温模壳拼装墙体结构中的卡板连接件对墙体热工性能的影响,通过热工理论计算、试验研究、ANSYS有限元热分析模拟软件3种方法,对比分析了无连接件、不同数量连接件以及双面抹灰不同条件下墙体的传热系数。结果表明:在无连接件条件下,实际墙体热工试验测试值与热工理论计算值的误差较小;连接件数量越多,热桥效应越明显,墙体的热工性能越差;采用有限元模拟软件对墙体进行热工设计结果较精确,可作为设计依据;研究结果可为模壳拼装墙体在超低能耗建筑的应用及能耗分析提供借鉴。

外墙保温研究现状及发展趋势

建筑节能需求随建筑业发展逐步增大,外墙保温是解决节能问题的方式之一。从外墙的保温方式入手,对国内外外墙保温的现状进行综述,并通过比较指出现阶段保温方式做法存在的问题。目前,众多仿生建筑以及仿生结构案例快速涌现,为外墙保温提供了思路。通过对动物翅膀表面以及皮毛等部位进行深入研究后发现,其具有的各类结构能够应用到外墙表面,极大地提高了外墙的光热转化效率,或者通过这种结构来降低自身的热传导率,减少热量的损失,保温效果也能得到相应的提高,在节省材料的同时,能够实现节能减排的效果。

Assessment of Building External Wall Thermal Performance Based on Temperature Deviation Impact Factor under Discontinuous Radiant Heating

As the variation and timely meeting thermal environment requirement of indoor air temperature has a close relationship with the thermal performance of building external wall under discontinuous radiant heating condition, one appropriate assessment method or index for assessing the building external wall thermal performance is very necessary. In order to reasonably evaluate the thermal performance of external wall under discontinuous radiant heating condition and build the direct connections and interactions among the indoor air temperature, external wall inner surface temperature and outdoor air temperature, the first and second impact factors of temperature deviation were established, based on one mathematical model of room heat transfer. For one experimental room and four types of external walls under discontinuous radiant heating condition, both the influence of the external wall inner surface temperature deviation on the indoor air temperature and that of the outdoor air temperature deviation on the external wall inner surface temperature were determined effectively with the first and second impact factors of temperature deviation. In addition, favourable performance for the self-insulation and inner insulation walls were found, due to their superiority in effectively and timely improving the indoor thermal environment under discontinuous radiant heating condition.

超低能耗建筑外墙聚氨酯空腔发泡保温施工技术

传统超低能耗建筑外墙保温基本为无机、有机板材复合外保温系统,施工过程中质量不稳定,系统主要问题包括空鼓、开裂、饰面层脱落、渗漏、细部节点出现热桥等。以在建项目工程为案例,深入介绍了超低能耗建筑外墙聚氨酯空腔发泡保温系统施工工艺及无热桥施工技术,归纳了外墙聚氨酯空腔发泡保温技术的施工应用要点及注意事项,总结了聚氨酯空腔发泡外墙保温技术优势,旨在改进超低能耗建筑外墙施工技术,在满足建筑节能要求的前提下,降低成本,加快推进超低能耗建筑高质量发展。

既有建筑外墙外保温节能改造及经济效益分析

随着社会的发展,许多二十世纪八九十年代建造的房屋外墙结构保温隔热性能已经不足以满足当今需求,从而导致能耗过高、室内热环境恶化。为此,我国正在积极推进绿色发展,努力实现低碳、可持续的生产和生活方式。为节约资源能源,改善居住环境,有必要对旧有建筑墙体进行改造。结合济南市某节能改造项目,介绍了一种新型外墙外保温工艺,并对其经济效益进行了综合研究,结果表明,该工艺节能效果好,经济效益显著。

严寒地区办公建筑外墙保温系统优化及碳减排分析

合理选择保温材料及厚度是实现低碳建筑的重要途径。以典型办公建筑为对象,选取严寒地区3个不同城市(漠河、哈尔滨、沈阳),模拟4种保温材料对建筑能耗的影响,结合生命周期评价与生命周期成本分析构建生态效率模型,核算建筑外保温系统的全生命周期碳排放及经济成本,并识别出具有最优生态效率的建筑外保温系统。结果表明,严寒地区采用建筑外保温系统能够带来良好的建筑节能及碳减排效果,但生命周期碳排放与经济成本结果具有明显差异,城市地理位置和保温材料类型影响其厚度优化。从地理位置角度,低纬度城市沈阳的建筑外墙保温系统具有最低的碳排放和经济成本,高纬度城市反之;从碳排放和成本效果来看,聚氨酯板>挤塑聚苯板>岩棉板>模塑聚苯板;3个城市采用聚氨酯板,从生态效率来看65 mm>60 mm>50 mm,其生命周期碳排放为101.95~184 kgCO_(2)eq/(m2∙a),经济成本为8.24~15.17元/(m^(2)∙a)。

复合保温外墙体系施工技术研究

随着我国能源消耗的不断增加,工程方对居住建筑节能的要求也在不断提高。当前,我国的建筑节能设计标准已经从节能50%以上到了第一阶段节能幅度大于75%以上的要求,总之,建筑节能设计已成为行业发展的当务之急。针对外墙施工存在经济效益差的问题,开展复合保温外墙体系施工技术研究。提出一种全新的施工方案,其中包括:墙体骨架和面板安装、泡沫混凝土填充浇筑和一体化保温板复合外墙保温体系施工。通过对新施工技术的经济效益分析得出,新技术更具经济效益,每平米的造价更低。

民用建筑节能检测中常用外墙保温隔热材料检测方法研究

为解决民用建筑能耗大的问题,本文结合某工程的实际情况,详细分析了民用建筑外墙保温隔热材料节能检测原理后,针对在检测过程中存在的问题,提出了相应的解决措施,其中涵盖了优化改善检测环境、创新升级检测设备以及做好取样工作等,旨在提升常用外墙保温隔热材料在民用建筑中的应用质量和效率,促进建筑行业的节能化发展,以期为相关人员提供参考和借鉴。

某工程建筑外墙外保温系统饰面砖脱落原因鉴定

随着建筑围护结构保温技术的进步和发展,建筑外墙外保温系统已被广泛使用。在大量建筑工程应用外保温技术的过程中,由于建筑所处气候条件、系统材料使用、施工工艺等方面的因素,外保温工程出现大面积裂缝、脱落以及空鼓。本文以某工程为实例,分析引起外墙饰面砖脱落的各方面原因,为避免此类危害提供一定的理论依据。

房屋建筑工程外墙保温施工技术分析

在城市化过程中,建筑工程起到了重要的作用。为了更好地满足目前城镇化发展和人们对于建筑工程的需要,达到提高建筑工程的绿色环保和舒适性的目的,本文从建筑外墙保温施工方面着手,着重研究了建筑外墙保温施工技术以及施工工艺,并探讨了该技术的优越性,最后通过具体工程案例探讨建筑外墙保温技术的实际应用。

建筑外墙外保温系统节能施工技术探析

伴随当下社会的不断进步,科学技术的日益提高同样促使建筑行业迈入了一个崭新的台阶,这也就促使人们开始将目光转移到居住环境上来,尤其是房屋建筑方面的需求也越来越高。当前,与建筑物外保温有关的技术已引起社会各方的高度重视,它直接影响着人类是否能够获得一个更为舒适的居住环境。作者从建筑外墙外保温系统节能技术的概况入手,对外墙外保温系统的施工工艺进行了较为系统的讨论,希望可以为提高我国建筑外墙外保温工程的品质,同时也为相关研究提供一些借鉴。

高层建筑外墙保温施工技术及节能材料的应用研究

在土建建筑绿色节能设计与施工要求的前提下,高层建筑外墙面的保温施工,也要采取重量轻、强度高、采光好的墙体保温材料,从不同保温层材料的物理特性、施工工艺等角度出发,进行建筑外墙保温施工重要工序的规划设计。通过围绕高层建筑外墙保温、节能、环保等的建设需求,探讨不同类别建筑材料的结构构造、通风状况与保温效果,并设置建筑工程保温施工的执行流程,以满足现代建筑工程的保温、节能与降耗要求。

外墙外保温工程施工技术要点及应用研究

外墙外保温工程是现代建筑工程中非常重要的子分部之一,它能够有效地提高建筑物的保温性能,降低能源消耗,延长建筑物的使用寿命。本文将从施工工艺流程、施工方法要点、作业安全等方面,对外墙外保温工程施工技术进行探讨。

大居市属保障房项目外墙外保温系统高坠风险分析及维修治理方法探讨

近年来,建筑外墙外保温系统的开裂、空鼓和高坠事件时有发生,成为社会关注的焦点问题。文章以典型某大居市属保障房项目为例,对建筑外墙外保温系统构造、黏结强度、外墙面损伤、空鼓及材料抗压强度进行检测,分析采用无机保温砂浆外保温系统的外墙产生开裂、空鼓乃至脱落的原因;在此基础上,提出与之相对应的维修方法、技术要点和保障措施。