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首页> 外文期刊>Building and Environment >Cooling efficiency of a brushless direct current stand fan
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Cooling efficiency of a brushless direct current stand fan

机译：无刷直流立式风扇的冷却效率

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摘要

In warm environments, isothermal cooling by deliberately enhanced air movement can maintain thermal comfort using less energy than compressor-based air conditioning. To evaluate the performance of a brushless direct current (DC) stand fan, the cooling fan efficiency (CFE) index was measured in a climatic chamber under four dry-bulb temperatures (24, 26, 28, and 30 ℃), six speed settings (corresponding to centreline speeds in the range 0.6-2.5 m/s at 1 m distance), two fan-manikin distances (1 and 2 m) and two orientations (front, side). The CFE index is defined as the ratio of the whole-body cooling effect generated by non-uniform airflow from the fan to its power consumption (℃/W). The CFE index overcomes the limitations of assessing the cooling effect based just on a few air speed measurements. The results show that the CFE index is influenced by dry-bulb temperature, fan speed setting, and fan-manikin distance, but not by fan-manikin orientation. The lower the temperature and the closer the fan, the higher is the CFE index. Increasing fan speed setting simultaneously enhances whole-body cooling and increases power use. Consequently, the CFE has a non-monotonic relationship with fan speed setting and the peak value is reached for an intermediate speed. As compared with previous testing results using an alternating current stand fan, the CFE index of the DC fan we tested is three times higher. As a complement to air-conditioning, the tested stand fan is a suitable energy-efficient technology for providing thermal comfort in warm environments.
机译：在温暖的环境中，通过故意增强空气流动来进行等温冷却，可以比使用基于压缩机的空调消耗更少的能量来维持热舒适性。为了评估无刷直流（DC）立式风扇的性能，在四个干球温度（24、26、28和30℃），六种速度设置下，在气候室内测量了冷却风扇效率（CFE）指数。 （对应于1 m距离处中心线速度在0.6-2.5 m / s范围内），两个风扇人体模型距离（1和2 m）和两个方向（前，侧面）。 CFE指数定义为风扇不均匀气流产生的整体冷却效果与其功耗（℃/ W）的比值。 CFE指数克服了仅根据一些风速测量评估冷却效果的局限性。结果表明，CFE指数受干球温度，风扇速度设置和风扇人体模型距离的影响，但不受风扇人体模型方向的影响。温度越低，风扇越近，CFE指数越高。同时提高风扇速度设置可增强全身冷却效果并增加能耗。因此，CFE与风扇速度设置具有非单调关系，并且在中等速度时达到峰值。与以前使用交流立式风扇的测试结果相比，我们测试的直流风扇的CFE指数高出三倍。作为空调的补充，经过测试的立式风扇是一种合适的节能技术，可在温暖的环境中提供热舒适感。

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  • 来源
    《Building and Environment》 |2015年第2期|196-204|共9页
  • 作者

    Bin Yang; Stefano Schiavon; Chandra Sekhar; David Cheong; Kwok Wai Tham; William W Nazaroff;

  • 作者单位

    Berkeley Education Alliance for Research in Singapore, 138602 Singapore, Singapore,School of Civil and Environmental Engineering, Nanyang Technological University, 639798 Singapore, Singapore,Department of Applied Physics and Electronics, Umea University, Umea 90187, Sweden;

    Center for the Built Environment, University of California, Berkeley, CA 94720, USA;

    Department of Building, National University of Singapore, 117566 Singapore, Singapore;

    Department of Building, National University of Singapore, 117566 Singapore, Singapore;

    Department of Building, National University of Singapore, 117566 Singapore, Singapore;

    Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Cooling fan efficiency index; Thermal manikin; Equivalent temperature; Thermal comfort; Air movement;

    机译：散热风扇效率指标;人体模型;等效温度热舒适性;空中运动;

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