The feedback of heat rejection to air conditioning load during the nighttime in subtropical climate
The feedback of heat rejection to air conditioning load during the nighttime in subtropical climate
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DOI：
10.1016/j.enbuild.2006.06.016
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发表时间：
2007-11
影响因子：
6.7
通讯作者：
Chun-Ming Hsieh;T. Aramaki;K. Hanaki
中科院分区：
文献类型：
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作者：
Chun-Ming Hsieh;T. Aramaki;K. Hanaki
台北市地处亚热带，地形属盆地型。夏季总是炎热潮湿，日落后的气温通常高于30°C。城市居住建筑中大量安装了窗式空调器，其排热不仅增加了室外空气温度，而且增加了冷负荷。根据台北市居民使用空调的时间表，计算出台北市空调的排热/建筑能耗和空气温度分布，并预测空调的额外耗电量。两个软件，EnergyPlus（建筑能源计划）和Windperfect（CFD，计算流体动力学软件）在这项研究中使用。在CFD模拟中，使用GIS（地理信息系统）创建了直径为700米的建筑物的几何形状，总网格数超过300万。采用Tam、Tbu和Tac三种指定温度来描述城市冠层内温度的逐时变化和随高度和水平剖面的空间分布。结果表明，随着高度的增加，温度逐渐升高，建筑物附近的温度始终高于环境空气。在19：01 ~次日02：00 h，散热对冷负荷的反馈（惩罚）为10.7%。
Taipei City, located in the subtropical zone, has a basin landform. The summer is always hot and humid and the air temperature right after sunset is typically higher than 30°C. Heat rejection from residential buildings in urban area, equipped with lots of the window type air conditioners, not only increases the air temperature outside, but also burdens the cooling load. Based on the time schedule of air conditioner use of Taipei citizens, the heat rejection/building energy use and the air temperature distribution were evaluated, and finally the additional electric consumption of air conditioners was predicted. Two software, EnergyPlus (building energy program) and Windperfect (CFD, computational fluid dynamics software) were employed in this study. In the CFD simulation, the geometry of buildings that covers 700m in diameter was created with GIS (geographical information system) and the total mesh number was more than 3 millions. Three specified temperatures (Tam, Tbuand Tac) were used to describe the temperature distribution within the urban canopy by hourly time variation and spatial distribution with height and horizontal profile. The results revealed that the temperature gradually increased with height and the temperature next to the buildings was always higher than the ambient air. The feedback (penalty) of heat rejection to cooling load was found 10.7% during 19:01 to 02:00h on the following day.