Solid-wall U -values: heat flux measurements compared with standard assumptions
Solid-wall U -values: heat flux measurements compared with standard assumptions
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实心壁 U 值：热通量测量值与标准假设的比较
DOI：
10.1080/09613218.2014.967977
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发表时间：
2014
影响因子：
3.9
通讯作者：
Li F
中科院分区：
文献类型：
--
作者：
Li F
在评估住宅的能源性能时，实心墙的假设U值是一个重要的不确定性来源。用于库存量能源需求评估和能源认证的英国实心墙的典型U值为2.1 Wm−2K−1。使用集中热质量和逆参数估计技术重新分析(基于40块砖实心墙和18面石墙)，得出这两种实心墙类型的平均值为1.3 ± 0.4 Wm−2K−1。在对政策的众多影响中，这表明标准的英国实心墙U值可能不适合用于能源认证或评估实心墙保温的投资经济性。对于库存级别的能源建模，更改实心墙的假定U值将使估计的年均空间采暖需求减少16%，并导致库存的一部分更改能源性能认证(EPC)频段。分析表明，住宅建筑中能源使用的多样性可能受到单个建筑构件物理特性的异质性的影响，也可能受到居住者行为变化的影响。政策评估和指导材料需要通过定期以经验数据为基础，承认和说明物理建筑特征的这种变化。
The assumedU-values of solid walls represent a significant source of uncertainty when estimating the energy performance of dwellings. The typicalU-value for UK solid walls used for stock-level energy demand estimates and energy certification is 2.1 Wm−2K−1. A re-analysis (based on 40 brick solid walls and 18 stone walls) using a lumped thermal mass and inverse parameter estimation technique gives a mean value of 1.3 ± 0.4 Wm−2K−1for both solid wall types. Among the many implications for policy, this suggests that standard UK solid-wallU-values may be inappropriate for energy certification or for evaluating the investment economics of solid-wall insulation. For stock-level energy modelling, changing the assumedU-value for solid walls reduces the estimated mean annual space heating demand by 16%, and causes a proportion of the stock to change Energy Performance Certification (EPC) band. The analysis shows that the diversity of energy use in domestic buildings may be as much influenced by heterogeneity in the physical characteristics of individual building components as it is by variation in occupant behaviour. Policy assessment and guidance material needs to acknowledge and account for this variation in physical building characteristics through regular grounding in empirical field data.