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Experimental study on direct evaporative cooling for free cooling of data centers

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  • Li, Chao
  • Mao, Ruiyong
  • Wang, Yong
  • Zhang, Jun
  • Lan, Jiang
  • Zhang, Zujing

Abstract

With the cold-fog direct evaporative cooling (CDEC) technology, which uses the natural cooling sources, the cooling energy consumption of data centers can be reduced, and thus the cooling cost can be decreased significantly. There are only a few studies on the application of CDEC in data centers. In this paper, CDEC technology is proposed to provide cooling sources for a data center after cooling the high-temperature fresh air and circulated air from the data center. According to the results of experiments, it can be concluded that only when the relative humidity of high-temperature fresh air is lower than 40 %, the treated air meets the air supply requirements of the data center. otherwise, the circulated air need be treated by CDEC in order to ensure that the air temperature can be reduced to below 30 °C and the relative humidity be less than 80 %. Compared with general evaporative cooling, the efficiency can be improved by 2.07 %–28.50 % with CDEC. Besides, according to the orthogonal experiment, the sequence of various influencing factors on the CDEC is: air speed > spray flow rate > spray angle, which provides guidance for the optimization of application of CDEC in data centers.

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  • Li, Chao & Mao, Ruiyong & Wang, Yong & Zhang, Jun & Lan, Jiang & Zhang, Zujing, 2024. "Experimental study on direct evaporative cooling for free cooling of data centers," Energy, Elsevier, vol. 288(C).
    • Handle: RePEc:eee:energy:v:288:y:2024:i:c:s0360544223032838
    DOI: 10.1016/j.energy.2023.129889
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    2. Guo, Haijin & Yu, Hang & Wang, Meng & Liu, Cheng & Li, Chaoen, 2025. "Integrated management of workloads and energy system for data centers," Energy, Elsevier, vol. 327(C).
    3. Kong, Rui & Zhang, Hainan & Tang, Mingsheng & Zou, Huiming & Tian, Changqing & Ding, Tao, 2024. "Enhancing data center cooling efficiency and ability: A comprehensive review of direct liquid cooling technologies," Energy, Elsevier, vol. 308(C).
    4. Wenchao Shi & Xiaochen Ma & Yunran Min & Hongxing Yang, 2024. "Feasibility Analysis of Indirect Evaporative Cooling System Assisted by Liquid Desiccant for Data Centers in Hot-Humid Regions," Sustainability, MDPI, vol. 16(5), pages 1-20, February.

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