Condensation effects on energy performance of building window systems
Condensation effects on energy performance of building window systems
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冷凝对建筑窗户系统能源性能的影响
DOI：
10.1016/j.egyr.2021.10.096
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发表时间：
2021
期刊：
影响因子：
5.2
通讯作者：
Memari, Ali
中科院分区：
文献类型：
--
作者：
Duan, Qiuhua;Hinkle, Laura;Wang, Julian;Zhang, Enhe;Memari, Ali
低辐射产品已被广泛接受为玻璃系统（包括单窗格窗户）的节能解决方案或能源改造策略，它可以减少红外辐射能量的发射并提高整个窗户的隔热性能。然而，添加低辐射层可能会增加冷凝风险，进而显着降低窗户的热性能。为了更好地了解低辐射窗户对整体建筑能源使用的冷凝影响，我们扩展了经典的努塞尔特薄膜冷凝模型，建立并验证了简化的基于双膜的分析模型，然后表征了低辐射涂层单层玻璃的冷凝相关热动力学。对忽略和考虑冷凝效应的模拟进行了一系列整个建筑能耗的比较。研究结果表明，如果考虑凝结效应，低辐射单层玻璃相对于原单层玻璃在某些气候条件下可能会对节能目的产生不利影响。使用低辐射产品进行窗户能源改造需要更仔细和全面的能源分析。
Low-e products have been accepted widely as an energy-efficient solution or energy retrofitting strategy for glazing systems, including single-pane windows, which may reduce the emission of radiant infrared energy and improve the insulating properties of overall windows. However, the addition of a low-e layer may increase the condensation risk, and in turn, significantly diminish the window’s thermal performance. To better understand the condensation effects of low-e windows on overall building energy use, we extended the classic Nusselt filmwise condensation model to establish and validate a simplified double-film-based analytical model, and then characterized the condensation-dependent thermal dynamics of low-e coated single-pane glazing. A series of whole building energy use comparisons between simulations ignoring and considering the condensation effect were conducted. The results indicate that if the condensation effect is taken into account, the low-e single-pane glazing may lead to adverse effects on the energy-saving purpose in certain climates relative to the original single-pane glazing. More careful and comprehensive energy analyses are needed to use low-e products for window energy retrofits.