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Experimental investigation of heat transfer during night-time ventilation

机译：夜间通风换热的实验研究

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摘要

Night-time ventilation is seen as a promising approach for energy efficient cooling of buildings. However, uncertainties in the prediction of thermal comfort restrain architects and engineers from applying this technique. One parameter essentially affecting the performance of night-time ventilation is the heat transfer at the internal room surfaces. Increased convection is expected due to high air flow rates and the possibility of a cold air jet flowing along the ceiling, but the magnitude of these effects is hard to predict. In order to improve the predictability, heat transfer during night-time ventilation in case of mixing and displacement ventilation has been investigated in a full scale test room. The results show that for low air flow rates displacement ventilation is more efficient than mixing ventilation. For higher air flow rates the air jet flowing along the ceiling has a significant effect, and mixing ventilation becomes more efficient. A design chart to estimate the performance of night-time cooling during an early stage of building design is proposed.
机译：夜间通风被认为是建筑物节能冷却的一种有前途的方法。但是，热舒适性预测中的不确定性限制了建筑师和工程师应用此技术。基本上影响夜间通风性能的一个参数是房间内部表面的热传递。由于高空气流速和冷空气沿天花板流动的可能性，预计对流会增加，但是这些影响的大小很难预测。为了提高可预测性，已经在大型测试室中研究了混合通风和置换通风时夜间通风期间的热传递。结果表明，对于低空气流量，置换通风比混合通风更有效。对于更高的空气流量，沿着天花板流动的空气射流具有显着的效果，并且混合通风变得更加有效。提出了一个设计图，用于估计建筑物设计早期阶段夜间制冷的性能。

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  • 来源
    《Energy and Buildings》 |2010年第3期|366-374|共9页
  • 作者

    N. Artmann; R.L. Jensen; H. Manz; P. Heiselberg;

  • 作者单位

    Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Building Technologies, CH-8600 Duebendorf, Switzerland Hybrid Ventilation Centre, Department of Civil Engineering, Aalborg University, DK-9000 Aalborg, Denmark;

    Hybrid Ventilation Centre, Department of Civil Engineering, Aalborg University, DK-9000 Aalborg, Denmark;

    Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Building Technologies, CH-8600 Duebendorf, Switzerland;

    Hybrid Ventilation Centre, Department of Civil Engineering, Aalborg University, DK-9000 Aalborg, Denmark;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    passive cooling; night-time ventilation; experiments; heat transfer; temperature efficiency; mixing ventilation; displacement ventilation;

    机译：被动冷却夜间通风;实验;传播热量;温度效率混合通风置换通气;

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