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自然光通过双层玻璃幕墙后其照度显著下降,透光率仅为10%~20%,在减少空调系统能耗时却影响了自然采光。通过室内自然光的照度测量发现,自然光照度在室内随纵深呈指数形式递减,在晴天和全阴天时距玻璃幕墙较近的位置(玻璃幕墙到1/2纵深)照度值都是高于500 lux的,而在3/4纵深后的工作面照度低于300 lux,室内可以采用部分自然光照明。结合建筑照明平面图,采取优化灯具控制回路开关设置的方法提高自然光利用率时,照明系统能耗将降低50%;采用主动式的采光设计,利用自然光时则照明系统将节能75%以上。 相似文献
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百叶遮阳对室内光环境的影响 总被引:1,自引:0,他引:1
利用Radiance和Daysim等光照模拟软件对百叶外遮阳从照度、光照均匀度、眩光等多方面定量分析其倾角的变化对室内光环境的影响情况。选择了三个处在不同光照分区的城市分析在不同的全年光照条件下百叶遮阳不同倾角对室内全年照明能耗的影响。模拟结果显示:百叶对室内照度的影响很大,百叶遮阳在90°时,室内照度下降了70%,60°时下降了86%,30°时下降了93%;百叶遮阳的增加可以有效地提高室内照度的均匀性;晴天,百叶遮阳可以有效降低室内照度至视觉舒适度范围,阴天,其对室内照度不利,导致室内照明能耗增加;在不同光照条件下,百叶遮阳对全年照明能耗的影响不同。 相似文献
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根据太阳光不同光谱对于采暖空调负荷和建筑采光的影响,建立了不同光谱特性下全年采暖空调照明能耗计算模型.利用该模型可以计算玻璃幕墙建筑能耗以及确定不同目标能耗的玻璃幕墙的热工参数,分析不同的玻璃幕墙的性能参数.模型更全面、准确地反映了玻璃幕墙热工性能参数对于建筑总能耗的影响,使玻璃幕墙的热工性能参数的选择更具有针对性和科学性. 相似文献
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广州某典型办公楼垂直百叶遮阳的综合节能分析 总被引:1,自引:0,他引:1
在夏热冬暖地区,降低窗和玻璃幕墙的外遮阳系数是降低空调能耗的有效方法之一,然而降低窗的外遮阳系数的同时也减少了对自然光的利用,从而增加了照明能耗.因此,需要对空调能耗和照明能耗进行权衡判断.本文对某办公楼的全年空调能耗和照明能耗进行了模拟,以建筑全年空调能耗和照明能耗的总和为控制指标,对建筑垂直外百叶遮阳结构(百叶出挑长度、百叶数和百叶倾角)进行了优化设计分析.结果表明,增加百叶出挑长度或增加百叶数,空调耗电量降低,照明耗电量增大,总能耗降低.但是,改变百叶偏角,空调和照明的总耗电量先是增大,而后减少,当百叶偏角为-15°时,总耗电量出现最大值. 相似文献
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双层皮玻璃幕墙建筑的能耗分析和优化设计 总被引:3,自引:0,他引:3
介绍了双层皮玻璃幕墙的研究背景及构造。从理论上分析了气流排热、壁面对流及太阳辐射等因素对建筑能耗的影响。应用EnergyPlus分析了通风腔风速、遮阳策略、朝向和结构参数对建筑能耗的影响。 相似文献
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Jan de Boer 《Bauphysik》2006,28(1):27-44
Daylight and thermal energy performance of facades in office buildings, Part 1: Daylight performance. Regarding the impact on indoor illumination facade systems have to provide an appropriate visual indoor environment. In addition daylight penetrating the room through the facades should favourably influence the overall building energy balance. Daylight utilization can directly reduce energy consumption for electric lighting and can indirectly – due to the higher luminous efficacy of daylight compared to commonly used artificial lighting systems – reduce the thermal loads within the conditioned building spaces. In part 1 of this contribution the influence of different facade solutions on room illumination is systematically investigated by means of a parametric study of significant room, outdoor, environmental and climatic parameters for ten facade systems. The facade systems considered are conventional, permanently shaded, and light redirecting systems. The analysis of system performance is based on newly developed characteristics which allow the analysis and optimization of different facade systems under working conditions. Part 2 of the contribution shows the energetic interaction of the facade dependent internal loads by artificial lighting system and solar heat gains. 相似文献
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采用Ecotect Analysis 2015和DeST软件,探究气凝胶玻璃作为围护结构对东北地区建筑的采光及建筑能耗的影响,模拟地址选取沈阳,模拟时间为1年,模拟模型为普通二层办公建筑。结果显示,光学性能方面,气凝胶玻璃应用后的可见光照度均能达到标准最低要求495lx,室内最低也达到540lx,天棚玻璃光线直射处的可见光照度降低了1419.3lx,避免了眩光;热学性能方面,相较于同样厚度的传统中空玻璃系统,使用气凝胶玻璃模拟的室内全年冷负荷量降低了10.65个百分点。研究发现,气凝胶玻璃作为建筑外围护结构时,可保证建筑应有的采光效果,在提高采光舒适度的前提下还能有效降低建筑能耗。 相似文献
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The Hong Kong climate is sub-tropical with hot and humid weather from May to September and temperate climate for the remaining 7 months period. A mechanical ventilation and air-conditioning (MVAC) system is usually operated to avoid the high temperatures resulting in high peak cooling loads. The facade design has a significant influence on the energy performance of office buildings. This work evaluates different ventilated facade designs in respect to energy savings.Thermal building simulations (TRNSYS) were linked to nodal airflow network simulations (COMIS) for detailed ventilated double-skin facade performance. In order to validate the model, simulations were carried out for an office building in Lisboa; the results were compared with measured data from the same building. The simulation results of surface and air temperatures show good agreement with the measurements. The results of the study can be used to reduce surface temperatures by using different materials for the roller blind that is positioned in the cavity of the double-skin facade. The results can further be used to reduce the high peak cooling loads during the summer period. This may result in significant energy savings and a reduction in the system's cooling capacity. It proved that a careful facade design can play an important role in highly glazed buildings and provides potential for energy efficiency. 相似文献
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本文通过实测,研究了夏季工况下双层垂直绿化对上海地区办公建筑热工环境的影响。实验结果表明,带有双层垂直绿化的办公室室内空气温度较普通房间平均降低了1.5℃,外墙外表面温度平均降低了1.3℃,双层垂直绿化可以有效改善上海地区办公建筑夏季热环境。本文通过实测探索了双层垂直绿化应用于办公建筑的节能潜力,并对双层垂直绿化植被选择、种植方式给出建议。 相似文献
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医院建筑能耗逐年升高,其中空调能耗占总能耗比例较大。在医院建筑的节能改造或能耗状况分析中,多数以单位建筑面积、门诊人数、床位数的能耗来评价医院能耗的高低。以夏热冬暖气候区医院门诊楼为研究对象,通过理论分析建立建筑负荷分析模型,设计建筑负荷正交模拟实验,利用模拟软件De ST进行负荷模拟,研究建筑面积、床位数、门诊量/床位数、医院类型对建筑全年总负荷的影响,模拟结果表明:建筑面积(床位数)越大,门诊量/床位数越大,未开展预约门诊的医院的年总负荷越大,反之越小。建筑年总负荷影响因素的主次顺序为门诊量/床位数建筑面积(床位数)医院类型,其中门诊量/床位数、建筑面积(床位数)对年总负荷影响显著(P0.05);医院类型对年总负荷影响不显著(P0.05)。建议采用人均单位面积能耗占用床位数指标来评价门诊楼的能耗,更加科学。 相似文献
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Maria Kolokotroni Syreeta Robinson-Gayle Stephen Tanno Andrew Cripps 《Building Research & Information》2004,32(1):2-16
The design of a building facade influences internal thermal and lighting conditions and energy use associated with the provision of these conditions. Key decisions about the building facade are usually taken during the concept design stage of a building, while decisions about the method of providing the environmental conditions are often made later in the design process. This dilemma is addressed by the development of a concept design tool that allows the design team to investigate the effect of facade design on the resulting internal environmental conditions, energy use and environmental impact. The concept design tool was developed by performing detailed thermal, lighting and environmental modelling for a number of generic office building facade designs and a range of parameters that affect directly the environmental performance of an office building. The results are presented in a user-friendly interface requiring a minimum number of inputs. Key parameter outputs (such as temperature, lighting levels, heating/cooling energy demand, embodied energy and eco-points) can then be viewed, while a more detailed analysis can also be created for specified facade designs. A parametric analysis of the summary result outputs for selected facade parameters indicates that natural ventilation and cooling can reduce the environmental impact of offices by up to 16%, although heating energy demand could increase significantly. Improving the construction standard of the facade and reducing the internal heat loads can reduce the environmental impact by up to 22%. Use of this tool at early design stages will benefit the design team through an improved understanding of the dynamics between facade design and building services and assist with a more integrated approach. 相似文献