共查询到19条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
5.
对一栋位于夏热冬冷地区的星级酒店建筑的空调系统进行分析。利用清华大学DeST能耗模拟软件对空调负荷进行逐时计算,并分析不同外窗结构情况下的全年电耗,从而进行经济性分析。通过分析可知:该建筑在空调系统设计中存在能耗高的问题,并随着使用时间的延续能源浪费巨大。建议对该空调系统进行全面改造,同时改造外窗结构也是一种简单而有效的节能手段。 相似文献
6.
7.
8.
9.
自改革开放以来,我国国民经济发展迅速,但在经济高速发展的同时,也带来了较为严重的能源问题,能源过度消耗对我国经济社会持续、健康发展影响巨大。建筑行业作为国民经济的支柱型产业,作为能源消耗大省,建筑能耗在河南省社会总能耗中所占比例较大,高达25%。广东省既有建筑量较大,多为耗能较高的建筑,此类建筑外墙热工性能不足,具有极大外墙能耗。为满足节能减耗需求,进一步减少建筑能耗,开展建筑外墙保温节能改造技术研究具有重要的现实意义。以某建筑工程外墙外保温节能改造为研究对象,对改造前外墙现状及外墙传热系数的计算与测试进行分析,并提出外墙外保温节能改造方案及施工要点,以期降低建筑能耗。 相似文献
10.
11.
Shading should be considered as an integral part of fenestration system design for commercial and office buildings, in order to balance daylighting requirements versus the need to reduce solar gains. In this paper, the simultaneous impact of glazing area, shading device properties and shading control on building cooling and lighting demand was calculated using a coupled lighting and thermal simulation module. The interactions between cooling and lighting energy use in perimeter spaces were evaluated as a function of window-to-wall ratio and shading parameters. An exterior roller shade was used as an example. The impact of shading device type, properties and control on building cooling and lighting energy demand was quantified and analyzed. The simulation results indicate that, if an integrated approach for automatic control of motorized shading is used in conjunction with controllable electric lighting systems, substantial reduction of energy demand for cooling and lighting could be achieved in perimeter spaces, depending on climatic conditions and orientation. 相似文献
12.
针对上海某图书馆建筑内外遮阳,采用计算法进行负荷计算,通过结果分析得到此图书馆在计算时刻下的日最大负荷值。从中可以看出除北向外,外遮阳都有不同程度的节能效果,而北向由于窗口不受太阳直射,没有遮阳效果;内遮阳的节能效果都随着材料的遮阳系数增加而增加。最后进行内外遮阳效果的对比,得到东、西向随遮阳板挑出长度增加,外遮阳节能效果更为显著;南向和北向以遮阳材料系数为0.5的内遮阳为佳。 相似文献
13.
针对太阳能富集地区居住建筑外墙构造特点和室外综合温度条件,以拉萨地区为例进行研究,提出了采暖居住建筑非平衡保温节能墙体构造,其中南墙不做保温、东西墙和北墙采用外保温。在对当地典型居住建筑形式和围护结构现状调研基础上,采用南墙兼顾延迟时间和传热系数,东西墙、北墙单位面积等净失热量的分析方法,确定了非平衡外墙的传热系数,并对以此设计的非平衡保温构造总净热损失和内表面温度进行了分析。给出了非平衡保温构造的计算与分析方法,为同类地区非平衡保温构造设计提供了方法和理论依据。 相似文献
14.
15.
In this paper hour-by-hour computer simulations of cooling load for a public building were carried out under local weather conditions using TRNSYS building computer simulation software. Different passive measures to reduce the cooling load were investigated. These include the envelope insulation, space ventilation, shading, glazing, artificial lighting variation, and evaporative cooling of the structure. The results show as high as 43% reductions in peak cooling load can be achieved using a combination of well-established passive cooling techniques and technologies. The significance of these results stems from the fact that they were obtained under local weather conditions, a matter of importance to building architects, designers, contractors, and builders as well as air-conditioning equipment manufacturers. Although this work was undertaken to improve the thermal performance of school buildings the results were extended to cover the summer school vacation months so that they will benefit public buildings as well. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
16.
隔热涂层降低建筑空调负荷效果的参数分析 总被引:1,自引:0,他引:1
从降低建筑空调负荷的角度出发,对外壁面有隔热涂层的房间建立了稳态传热模型,用数值方法逐一分析了涂层的各种参数,包括导热系数、厚度、表面太阳吸收率、发射率以及地区因素等对空调负荷的影响。研究发现:隔热涂层能显著降低空调负荷及能耗;仅当涂层热阻与墙体热阻之比大于0.2时,涂层导热系数的降低才会对空调负荷产生显著影响;涂层表面太阳吸收率和发射率对空调负荷的影响非常大,是起主导作用的因素;隔热涂层用在太阳辐照密度越大、日最高气温越低、日较差越大的地区节能率越高,越有利于发挥其降低空调负荷及日累计能耗的功能;决定着空调运转时间长短的当地室外气温分布状况对于评价隔热涂层节能效果也有重要影响。 相似文献
17.
18.
19.
Daylighting has long been recognized as a potential energy-efficient design strategy for buildings. Natural light can help reduce the electrical demand and the associated sensible cooling load due to artificial lighting. In Hong Kong, however, many buildings are constructed close to each other and hence the external environment plays a significant role in daylighting designs. This paper investigates the shading effects due to nearby obstructions when daylighting schemes are being employed. We used the computer simulation tool, EnergyPlus, to illustrate the energy performance of a generic commercial building with daylighting controls obstructed by neighbouring buildings of various heights. Analysis of electricity savings was carried out for the perimeter zones of the whole building and individual floors. Regression techniques were conducted to correlate the building energy savings and the angles of obstructions. It was found that the shading effects due to nearby obstructions strongly affect the building energy budget when daylighting designs are used. Building designers should critically consider the external environment in order to achieve energy-efficient building designs. 相似文献