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首页> 外文学位 >Microchannel radiator: An investigation of microchannel technology with applications in automotive radiator heat exchangers.
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Microchannel radiator: An investigation of microchannel technology with applications in automotive radiator heat exchangers.

机译：微通道散热器：对微通道技术及其在汽车散热器热交换器中的应用的研究。

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摘要

Microchannels have been used in electronics cooling and in air conditioning applications as condensers. Little study has been made in the application of microchannels in automotive heat exchangers, particularly the radiator. The presented research captures the need for the design improvement of radiator heat exchangers in heavy-duty vehicles in order to reduce aerodynamic drag and improve fuel economy. A method for analyzing an existing radiator is set forth including the needed parameters for effective comparisons of alternative designs. An investigation of microchannels was presented and it was determined that microchannels can improve the overall heat transfer of a radiator but this alone will not decrease the dimensions of the radiator. Investigations into improving the air-side heat transfer were considered and an improved fin design was found which allows a reduction in frontal area while maintaining heat transfer. The overall heat transfer of the design was improved from the original design by 7% well as 52% decrease in frontal area but at the cost of 300% increase in auxiliary power. The energy saved by a reduction in frontal area is not substantial enough to justify the increase of auxiliary power.;The findings were verified through a computational fluid dynamic model to demonstrate the heat transfer and pressure drop of microchannel tubes. The results confirmed that heat transfer of microchannels does improve the thermal performance of the radiator but the pressure drop is such that the net benefit does not outweigh the operating cost. An additional CFD study of the new fin geometry and air-side heat transfer predictions was conducted. The results of the study confirmed the theoretical calculations for the fin geometry.
机译：微通道已经在电子设备冷却和空调应用中用作冷凝器。微通道在汽车换热器，特别是散热器中的应用研究很少。提出的研究表明，需要对重型车辆的散热器热交换器进行设计改进，以减少空气动力阻力并提高燃油经济性。提出了一种用于分析现有散热器的方法，该方法包括用于有效比较替代设计所需的参数。提出了对微通道的研究，并确定微通道可以改善散热器的整体传热，但仅此一项并不能减小散热器的尺寸。考虑了改善空气侧传热的研究，并发现了改进的散热片设计，可以在保持传热的同时减小正面面积。该设计的总传热比原始设计提高了7％，正面面积减少了52％，但以辅助功率增加300％为代价。额叶面积减少所节省的能量不足以证明增加辅助功率是合理的。通过计算流体动力学模型验证了发现，以证明微通道管的传热和压降。结果证实，微通道的传热确实改善了散热器的热性能，但是压降使得净收益不超过运行成本。对新的散热片几何形状和空气侧传热的预测进行了额外的CFD研究。研究结果证实了翅片几何形状的理论计算。

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  • 作者

    Checketts, Gus Thomas.;

  • 作者单位

    University of North Texas.;

  • 授予单位 University of North Texas.;
  • 学科 Mechanical engineering.;Automotive engineering.
  • 学位 M.S.
  • 年度 2014
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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