...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Building and Environment >Impact of computational domain on the prediction of buoyancy-driven ventilation cooling
【24h】

Impact of computational domain on the prediction of buoyancy-driven ventilation cooling

机译：计算域对浮力驱动通风降温预测的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Traditional solar heated cavity structures such as solar chimneys make use of the stored solar energy in the interior wall to enhance natural ventilation of buildings but integration of photovoltaic devices into the exterior wall of such a structure can result in different proportions of heat distribution on both interior and exterior walls. This paper presents results of CFD simulation of the buoyancy-driven airflow and heat transfer in vertical cavities of different heights and widths with different total heat fluxes and wall heat distributions for ventilation cooling. Two sizes of computational domain were used for simulation - a small domain same as the physical size of a cavity and a large extended domain that is much larger than the cavity. The predicted natural ventilation rate and heat transfer coefficient have been found to depend on not only the cavity size and the quantity and proportion of heat distribution on the cavity walls but also the domain size. The difference in the predicted ventilation rate or heat transfer coefficient using the small and large domains is generally larger for wider cavities where heat distribution on two vertical walls is highly asymmetrical; incoming air would be distorted from symmetrical distribution across the inlet opening; and/or significant reverse flow would occur at the outlet opening. The difference in the heat transfer coefficient is generally less than that in the ventilation rate. In addition, a cavity with symmetrical heating has a higher ventilation rate but lower heat transfer coefficient than does an asymmetrically heated cavity.
机译：传统的太阳能加热型腔结构（例如太阳能烟囱）利用内壁中存储的太阳能来增强建筑物的自然通风，但是将光伏设备集成到这种结构的外壁中可能会导致两个内部空间的热量分配比例不同和外墙。本文介绍了CFD模拟浮力驱动的气流和不同高度和宽度，不同总热通量和不同壁热分布的垂直空腔中的换热的结果，以进行通风冷却。模拟使用了两种大小的计算域-一个与型腔物理尺寸相同的小域和一个比型腔大得多的大扩展域。已经发现预测的自然通风速率和传热系数不仅取决于腔的尺寸以及腔壁上热分布的数量和比例，还取决于区域的尺寸。对于两个垂直壁上的热量分布高度不对称的较宽的空腔，使用大和小区域的预测通气率或传热系数之差通常会更大。进入的空气会因进气口的对称分布而变形；和/或大量的逆流将发生在出口处。传热系数的差异通常小于通风速率的差异。另外，与非对称加热的腔相比，具有对称加热的腔具有更高的通风率，但传热系数更低。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号