• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Building and Environment >Numerical study of a M-cycle cross-flow heat exchanger for indirect evaporative cooling
【24h】

Numerical study of a M-cycle cross-flow heat exchanger for indirect evaporative cooling

机译：间接蒸发冷却的M循环错流换热器的数值研究

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

In this paper, numerical analyses of the thermal performance of an indirect evaporative air cooler incorporating a M-cycle cross-flow heat exchanger has been carried out The numerical model was established from solving the coupled governing equations for heat and mass transfer between the product and working air, using the finite-element method. The model was developed using the EES (Engineering Equation Solver) environment and validated by published experimental data. Correlation between the cooling (wet-bulb) effectiveness, system COP and a number of air flow/exchanger parameters was developed. It is found that lower channel air velocity, lower inlet air relative humidity, and higher working-to-product air ratio yielded higher cooling effectiveness. The recommended average air velocities in dry and wet channels should not be greater than 1.77 m/s and 0.7 m/s, respectively. The optimum flow ratio of working-to-product air for this cooler is 50%. The channel geometric sizes, i.e. channel length and height, also impose significant impact to system performance. Longer channel length and smaller channel height contribute to increase of the system cooling effectiveness but lead to reduced system COP. The recommend channel height is 4 mm and the dimensionless channel length, i.e., ratio of the channel length to height, should be in the range 100 to 300. Numerical study results indicated that this new type of M-cycle heat and mass exchanger can achieve 16.7% higher cooling effectiveness compared with the conventional cross-flow heat and mass exchanger for the indirect evaporative cooler. The model of this kind is new and not yet reported in literatures. The results of the study help with design and performance analyses of such a new type of indirect evaporative air cooler, and in further, help increasing market rating of the technology within building air conditioning sector, which is currently dominated by the conventional compression refrigeration technology.
机译：本文对包含M循环错流换热器的间接蒸发式空气冷却器的热性能进行了数值分析。通过求解耦合的控制方程，建立了产品与产品之间的传热传质方程，建立了数值模型。工作空气，使用有限元方法。该模型是使用EES（工程方程求解器）环境开发的，并通过已发布的实验数据进行了验证。建立了冷却（湿球）效率，系统COP和许多气流/交换器参数之间的相关性。发现较低的通道空气速度，较低的入口空气相对湿度和较高的工质空气比产生较高的冷却效率。建议在干燥和潮湿通道中的平均风速分别不应大于1.77 m / s和0.7 m / s。该冷却器的工作空气与产品空气的最佳流量比为50％。通道的几何尺寸，即通道的长度和高度，也对系统性能产生重大影响。较长的通道长度和较小的通道高度有助于提高系统冷却效率，但会导致系统COP降低。推荐的通道高度为4 mm，无量纲的通道长度（即通道长度与高度的比）应在100到300的范围内。数值研究结果表明，这种新型的M循环热质交换器可以实现与传统的错流式热交换器相比，间接蒸发式冷却器的冷却效率高16.7％。这种模型是新的，尚未在文献中报道。研究结果有助于这种新型的间接蒸发式空气冷却器的设计和性能分析，并且进一步有助于提高建筑空调领域技术的市场价值，目前该领域已被传统的压缩制冷技术所主导。

著录项

  • 来源
    《Building and Environment》 |2011年第3期|p.657-668|共12页
  • 作者

    Changhong Zhan; Xudong Zhao; Stefan Smith; S.B. Riffat;

  • 作者单位

    Department of the Built Environment. University of Nottingham, University Park, Nottingham NC7 2RD, UK School of Civil Engineering, Northeast Forestry University, Harbin 150040, China;

    lnstitute of Energy and Sustainable Development, De Montfort University, The Gateway, Leicester LEI 9BH, UK;

    lnstitute of Energy and Sustainable Development, De Montfort University, The Gateway, Leicester LEI 9BH, UK;

    Department of the Built Environment. University of Nottingham, University Park, Nottingham NC7 2RD, UK;

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

    evaporative cooling; cross-flow; heat and mass transfer; numerical simulation;

    机译：蒸发冷却;横流;传热传质;数值模拟;

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