The effects of external wall insulation thickness on annual cooling and heating energy uses under different climates
The effects of external wall insulation thickness on annual cooling and heating energy uses under different climates
复制标题
DOI：
10.1016/j.apenergy.2011.12.009
复制
发表时间：
2012-09
期刊：
影响因子：
11.2
通讯作者：
D. Pan;M. Chan;S. Deng;Zhongping Lin
中科院分区：
文献类型：
--
作者：
D. Pan;M. Chan;S. Deng;Zhongping Lin
外墙保温通过影响冷热能源的使用，在建筑能耗中起着重要的作用。本文研究了中国不同气候条件下外墙保温厚度对年冷暖能耗的影响。首先，引入了年冷热用电量总和的能量增益比（EGR）和相对变化率（RVR）两个指标来评价外墙保温厚度对节能潜力的影响；其次，给出了办公楼内四个不同的外部区域的模型空间，并对模型空间的设置进行了描述。最后，对中国广州、上海和北京3个不同气候条件下，不同外墙保温厚度的4个不同外区的年冷暖能耗进行了模拟分析。结果表明，在北京气候条件下，增加各向外区的外墙保温厚度，节能效果显著，因为采暖能耗占主导地位，且随着保温厚度的增加，节能效果显著降低。在上海的气候条件下，将外墙保温厚度增加到26mm以上并不会减少朝南的外区每年的供暖和制冷能源消耗总量，但会有助于节省面向其他三个方向的外区能源。然而，对于广州气候下的所有外部区域，通过增加外墙保温厚度来减少年供暖和制冷能耗的总和几乎是不可能的。
External wall insulation plays an important role in building energy consumption through affecting cooling and heating energy uses. In this paper, a study on the effects of external wall insulation thickness on annual cooling and heating energy uses under different Chinese climates is reported. Firstly, two indexes: Energy Gain Ratio (EGR) and Relative Variation Ratio (RVR) of the sum of annual cooling and heating energy uses, to assess the effects of external wall insulation thickness on energy saving potential are introduced. Secondly, a model space having four different exterior zones facing four different orientations in an office building is presented and the settings of the model space described. Lastly, the simulated annual cooling and heating energy uses for the four different exterior zones at different external wall insulation thicknesses under three different climates in China, Guangzhou, Shanghai and Beijing, are reported. The results suggested that energy saving was significant by increasing the external wall insulation thickness in exterior zones facing all orientations under Beijing’s climate, since the heating energy use was dominant and can be reduced remarkably with the increase in insulation thickness. Under Shanghai’s climate, increasing external wall insulation thickness to over 26mm would not reduce the sum of annual heating and cooling energy uses in the south-facing exterior zone, but would help save energy in exterior zones facing the other three orientations. For all exterior zones under Guangzhou’s climate, it was, however, hardly possible to reduce the sum of annual heating and cooling energy uses by increasing the external wall insulation thickness.