共查询到17条相似文献,搜索用时 203 毫秒
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本文以广州地区某超高层外遮阳建筑作为研究对象,采用STAR-CCM+软件对建筑室内风环境进行模拟,分析在不同遮阳状态下的室内通风状况和变化规律,揭示垂直活动外遮阳对室内自然通风的影响,总结垂直活动外遮阳装置对建筑室内自然通风的影响规律,从而有效地指导节能设计. 相似文献
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以武汉市某居住建筑为研究对象,采用Dest—h能耗模拟软件进行能耗模拟。分析居住建筑用能限值与实际能耗的误差及其产生的原因,研究建筑外围护结构传热系数、遮阳系数、换气次数、建筑朝向、室内空调供暖设备对居住建筑能耗的影响。结果表明:实际能耗远低于居住建筑用能限值的主要原因是空调间歇运行、居民开窗通风和居民的忍受极限。降低建筑外围护结构的传热系数,利用自然通风,选择合理的遮阳形式以及提高空调供暖系统的能效比均能够产生良好的节能效果。 相似文献
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本文采用CFD软件对西安地区某一居住建筑室内流场进行数值模拟,通过模拟结果优化室内空间布局从而增大自然通风量。利用DeST-h软件对优化前后的全年累计冷/热负荷进行动态模拟,分析通风量对能耗的影响;在通风次数一定的情况下,模拟分析复合墙体的材料和结构类型对能耗的影响。结果表明,在利用自然通风和蓄热耦合原理降低建筑能耗的过程中,增大通风量的节能效果优于改变墙体的材料;外保温的节能效果优于内保温;在优化墙体的材料方面,重型墙体结构的节能效果优于轻型墙体结构,其中,内隔墙材料的优化对节能效果最为显著。 相似文献
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Zhang Lin C.K. LeeSquare Fong T.T. ChowTing Yao A.L.S. Chan 《Energy and Buildings》2011,43(1):130-136
Stratum ventilation has been proposed to cope for elevated indoor temperatures recommended by governments in East Asia. TRNSYS is used for computation of the space cooling load and system energy consumption. Typical configurations of an office, a classroom and a retail shop in Hong Kong are investigated. Compared with mixing ventilation and displacement ventilation, stratum ventilation derives its energy saving potential largely from the following three factors: the reduction in ventilation and transmission loads and increased COP of chillers. The year-round energy saving is found to be substantial at 25% and 44% at least when compared with displacement ventilation and mixing ventilation, respectively. 相似文献
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随着住宅节能技术的广泛推行,对窗户的气密性要求越来越高,冬季冷风渗透远远不能满足室内人员对新风的最低需求。为了寻找节能、舒适的通风方式,本研究利用FLUENT对工程中较为常见的通风方式:自然通风方式、自然进机械排通风方式、带热交换的墙式通风器方式、带热交换的通风换气机组方式在气流组织、舒适性能、能耗特性及初投资方面进行了应用效果评价。最终得出:对于层高和装修标准较高的高级住宅中使用带热交换的通风换气机组,可以使通风系统在满足热舒适性和空气品质的基础上,更加节能,而对于一般住宅建筑,自然进机械排通风方式是相对最优选择。 相似文献
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利用Energyplus软件对夏热冬冷地区高大公用建筑空调能耗进行模拟分析,通过正交试验法研究空调能耗受负荷影响因子的影响情况,给出的影响因子排序为设备负荷〉照明负荷〉人员密度〉室内设计温度〉新风量〉窗墙比〉外窗传热系数〉屋面传热系数〉遮阳系数〉外墙传热系数;进一步研究围护结构的影响因子与空调节能的关系,拟合得到节能率与围护结构影响因子间的回归方程,用于指导建筑空调节能设计及改造。 相似文献
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Stratum ventilation has been proposed to accommodate elevated indoor temperatures recommended by governments in East Asia. TRNSYS is used for computation of the space cooling loads, sensible and latent, as well as system energy consumption. Typical configurations of an office, a classroom and a retail shop in Hong Kong are investigated. Desiccant dehumidification with and without solar assistance is utilized for the air treatment under displacement ventilation and stratum ventilation, while simple reheating is adopted under mixed ventilation. Compared with mixing ventilation and displacement ventilation, stratum ventilation derives its energy saving potential largely from the following five factors: the reduction in ventilation, dehumidification and transmission loads, prolonged free cooling period and increased the COP of the chillers. For the office, the year-round energy saving is found to be substantial at 20% and 40% without the need for solar energy provision when compared with displacement ventilation and mixing ventilation respectively. For the classroom and retail shop, the year-round energy saving is at about 25% and at least 37% with the aid of solar energy provision when compared with displacement ventilation and mixing ventilation respectively. 相似文献
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为了对南京地区进行夜问通风的可行性进行预测,选取南京地区某典型办公楼,利用建筑全能耗模拟软件EnergyPlus进行了模拟研究。在典型气象条件下,分别考虑了通风时间,换气次数等因素对室内温湿度及空气比焓的影响。将室内空气焓值的变化等效为空气源热泵空调耗电量,通过对比空调的耗电量与通风风机的耗电量,得出最佳的换气次数,并进行了节能效果分析。结果表明:通风时间选择在室外温度较低的时间段内较为合适。换气次数在不同的通风时间下对应不同的临界点,当换气次数小于临界点的换气次数时,等效空调耗电量大于风机耗电量,此时具有节能效果。当通风时间为6:00~6:30时,换气次数为1-2ac/h时,等效空调的耗电量与风机的耗电量差值的绝对值最大,半小时通风的最大节能达到3.6kWh。 相似文献
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A naturally ventilated cavity roof as potential benefits for improving thermal environment and cooling load of a factory building 总被引:1,自引:0,他引:1
The impact of natural ventilation of a roof cavity on improvement of the thermal environment and reduction of cooling load of a factory building is discussed. A computer program was developed with the logic in a companion paper [1] to observe the effect of cavity ventilation on the operative temperature of the occupied zone in the factory. Comparisons were made between factories with a cavity roof and a single roof in the Japanese climate. Results showed that the cavity roof was superior to the single roof in lowering the operative temperature by about 4.4 °C. When the factory was air conditioned, the cooling load reduction reached approximately 50% during the summer to maintain an operative temperature of 26 °C. Results showed that a naturally ventilated cavity roof has excellent potential for improving the indoor thermal environment and energy savings of factory buildings without complicated cooling installations and life time power consumption. 相似文献