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Sensitivity of night cooling performance to room/system design: Surrogate models based on CFD

机译：夜间制冷性能对房间/系统设计的敏感性：基于CFD的替代模型

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摘要

Night cooling, especially in offices, attracts growing interest. Unfortunately, building designers face considerable problems with the case-specific convective heat transfer by night. The multizone building energy simulation programs they use actually need extra input, from either costly experiments or computational fluid dynamics (CFD) simulations. Alternatively, up-front research on how to engineer best night cooled spaces can thrust the application of night cooling. The authors of underlying paper set up a global surrogate-based optimization procedure to find room/system design solutions which induce a high convective heat flux during night cooling in a generic open plan office. This fully-automated configuration of data sampling, geometry/grid generation, CFD solving and surrogate modelling generated several surrogate models. These surrogate models indicated how the convective heat flux in the night cooled open plan office related to the ventilation concept, the thermal mass distribution, the geometry and the driving force for convective heat transfer. Actually these surrogate models merely guided the data sampling towards the global optimum. However, they also provided additional rough- hewn insights into the global behaviour. The results indicated that cases with thermal mass at the floor produce convective heat fluxes which are significantly higher than the ones with thermal mass at the ceiling. Among these cases, the performance of cross ventilation surpasses the ones of both single sided ventilation and under floor ventilation. Among the cases with a thermally massive ceiling, single sided ventilation seems superior. However, while cross ventilation is generally a robust ventilation concept, single sided ventilation is particularly sensitive to the geometry.
机译：夜间降温，尤其是在办公室，引起了越来越多的兴趣。不幸的是，建筑设计师在夜间因案例而异的对流传热方面面临很多问题。他们使用的多区域建筑能耗模拟程序实际上需要来自昂贵的实验或计算流体力学（CFD）模拟的额外输入。另外，有关如何设计最佳夜间制冷空间的前期研究可能会推动夜间制冷的应用。基础论文的作者建立了一个基于代理的全局优化程序，以查找在常规开放式办公室的夜间制冷过程中引起高对流热通量的房间/系统设计解决方案。数据采样，几何/网格生成，CFD解决方案和代理建模的这种全自动配置生成了多个代理模型。这些替代模型表明，夜间冷却的开放式办公室中的对流热通量与通气概念，热质量分布，几何形状和对流热传递的驱动力有何关系。实际上，这些替代模型仅指导数据采样朝着全局最优方向发展。但是，他们还提供了有关全球行为的其他粗略见解。结果表明，在地板上具有热质量的情况下产生的对流热通量明显高于在天花板上具有热质量的情况。在这些情况下，交叉通风的性能优于单侧通风和地板下通风。在天花板较大的情况下，单面通风似乎更为出色。但是，尽管交叉通气通常是可靠的通气概念，但单侧通气对几何形状特别敏感。

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  • 来源
    《Building and Environment》 |2012年第12期|p.23-36|共14页
  • 作者

    Kim Goethals; Ivo Couckuyt; Tom Dhaene; Arnold Janssens;

  • 作者单位

    Research Croup of Building Physics, Construction and Services, Department of Architecture and Urban Planning, Faculty of Engineering and Architecture, Ghent University, J. Plateaustraat 22, B-9000 Ghent, Belgium;

    Internet Based Communication Networks and Services Research Group, INTEC, IBBT-Ghent University, Gaston Crommenlaan 8 Box 201, B-9050 Ghent, Belgium;

    Internet Based Communication Networks and Services Research Group, INTEC, IBBT-Ghent University, Gaston Crommenlaan 8 Box 201, B-9050 Ghent, Belgium;

    Research Croup of Building Physics, Construction and Services, Department of Architecture and Urban Planning, Faculty of Engineering and Architecture, Ghent University, J. Plateaustraat 22, B-9000 Ghent, Belgium;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    night cooling; convective heat transfer; design; computational fluid dynamics; surrogate modelling;

    机译：夜间降温;对流换热;设计;计算流体动力学;替代模型;

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