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建筑体形对建筑负荷及其影响参数敏感度的影响
高枫, 朱能
天津大学
摘要:
设计初期,体形系数与建筑负荷的相关性及负荷相关参数的敏感度排序有助于提升建筑能耗表现。本文以北京气候为背景,对A(体形规律变化)、B(体形非规律变化)两组办公建筑负荷模型实施Morris敏感性分析。全局样本检验下,仅单因素(层数或长宽比)作用下的体形系数与供暖负荷呈线性正相关且具备普遍性。总负荷的高敏感参数中,供暖制冷设定温度、室内负荷参数敏感度排序靠前但受建筑体形影响微弱;垂直外围护结构及屋顶结构参数的敏感度排序靠后,并分别与体形指标S1(平面周长/平面面积)、 S2(1/层数)表现出相似的波动趋势,进而可根据已有案例中的Morris敏感度对相似案例中的参数敏感度进行估算,对于热活动以导热为主的参数,误差率可控制在10%以内。在寒冷地区,单纯的层数或长宽比变化更能保障体形系数对能耗表现评价的准确性,而敏感度估算可快速获得热活动以导热为主的外围护结构参数敏感度。
关键词:  Morris敏感性分析  供暖负荷  制冷负荷  体形系数  敏感度估算
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基金项目:寒冷气候区低能耗公共建筑空间设计理论和方法 国家自然科学基金项目(面上项目,重点项目,重大项目)
Effect of Building Shape on Building load And the Sensitivity of its Influential Parameters
GaoFeng, Zhu Neng
Tianjin University
Abstract:
In early design stage, the correlation between building shape coefficient (SC) and building load as well as the sensitivity of important building loads parameters are helpful in improving building energy performance (BEP). Based on Beijing climate, office-building load models in group A (regular change of shape) and group B (irregular change of shape) were analyzed by Morris sensitivity analysis. Under the global sample test, only the SC under the single-factor change (layer or aspect ratio) was linearly positively correlated with heating load and owned universality. Among high sensitive parameters for total building load, the sensitivity of set-point temperatures and internal loads ranked high and suffered less effect from building shape; sensitivities of some parameters in vertical exterior structure and roof structure ranked low and respectively showed similar fluctuation with S1 (plane circumference/plane area) and S2 (1/ floor number). Then sensitivities of corresponding parameters in a certain building can be estimated based on existing Morris SA results; for parameters whose thermal activity dominated by heat conduction, the error rate of sensitivity estimation can be controlled within 10%. In cold regions, the single-factor shape change can better ensure the accuracy of BEP evaluation based on SC, and the sensitivity estimation can quickly obtain the sensitivity of the exterior envelop structure parameters whose thermal activity dominated by heat conduction.
Key words:  Morris sensitivity analysis  heating load  cooling load  shape coefficient  sensitivity estimation