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Energy saving potential of heat removal using natural cooling water in the top zone of buildings with large interior spaces

机译：内部空间大的建筑物顶部区域使用自然冷却水进行散热的节能潜力

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摘要

Generally, ventilation with outdoor air is used to directly remove heat in the top zone of large-space buildings to conserve energy. However, this will increase the latent cooling load because a large amount of humidity can be introduced to the interior when the outdoor air is humid. Therefore, a new method that incorporates a natural cooling water system in the top zone and does not introduce moisture is proposed in this study. The cooling tower as the source of natural cooling water and dry fan coil units (FCUs) as the terminal of removing heat were selected as an example of this new method. In order to analyze the energy saving potential of the new method, 9 cases involving different heat source distributions and cities were simulated by CFD, and 3 more cases with the traditional method were discussed. The results show that the traditional method increases the system energy consumption when the outdoor air humidity is high, and the biggest growth rate is 57.4%. But, the new method can be applied in different cities and in different heat source distributions, and can achieve a considerably high energy saving rate, ranging from 5.2% to 21.4%. The energy saving rate increases as the heat source ratio between the bottom zone and top zone decreases, because more heat can be removed by the dry FCUs. The energy saving rate varies by city, due to the different cooling water temperature. This new method will help guide the design of HVAC systems in large-space buildings. (C) 2017 Elsevier Ltd. All rights reserved.
机译：通常，使用室外空气进行通风可直接去除大空间建筑物顶部的热量，以节省能源。但是，这将增加潜在的冷却负荷，因为当室外空气潮湿时会向室内引入大量的湿度。因此，本研究提出了一种在顶部区域采用自然冷却水系统且不引入水分的新方法。这种新方法的示例是选择冷却塔作为自然冷却水的来源，以及将干燥风扇盘管单元（FCU）作为除热的终端。为了分析该新方法的节能潜力，通过CFD模拟了9个涉及不同热源分布和城市的案例，并讨论了3个使用传统方法的案例。结果表明，传统方法在室外空气湿度较高时会增加系统能耗，最大增长率为57.4％。但是，该新方法可以应用于不同城市和不同热源分布，并且可以实现相当高的节能率，范围从5.2％到21.4％。随着底部区域和顶部区域之间的热源比率降低，节能率会提高，因为干燥的FCU可以去除更多的热量。由于冷却水温度不同，节能率因城市而异。这种新方法将有助于指导大空间建筑中的HVAC系统设计。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Building and Environment》 |2017年第11期|323-335|共13页
  • 作者

    Liang Chao; Shao Xiaoliang; Li Xianting;

  • 作者单位

    Tsinghua Univ, Sch Architecture, Dept Bldg Sci, Beijing 100084, Peoples R China|Tsinghua Univ, Minist Educ, Key Lab Eco Planning & Green Bldg, Beijing, Peoples R China;

    Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Beijing 100083, Peoples R China;

    Tsinghua Univ, Sch Architecture, Dept Bldg Sci, Beijing 100084, Peoples R China|Tsinghua Univ, Minist Educ, Key Lab Eco Planning & Green Bldg, Beijing, Peoples R China;

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

    Air conditioning; Large space; Natural cooling; Dry FCU; Energy saving;

    机译：空调;大空间;自然冷却;干式FCU;节能;

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