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Experimental Study on Thermal Performance of a Loop Heat Pipe with Different Working Wick Materials

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  • Kyaw Zin Htoo

    (Graduate School of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan)

  • Phuoc Hien Huynh

    (Department of Heat and Refrigeration Engineering, Ho Chi Minh City University of Technology—VNU—HCM (HCMUT), 268 Ly Thuong Kiet, Ho Chi Minh City 72409, Vietnam)

  • Keishi Kariya

    (Department of Mechanical Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan)

  • Akio Miyara

    (Department of Mechanical Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
    International Institute for Carbon-Neutral Energy Research, Kyushu University, Nishi-ku, Motooka, Fukuoka 819-0395, Japan)

Abstract

In loop heat pipes (LHPs), wick materials and their structures are important in achieving continuous heat transfer with a favorable distribution of the working fluid. This article introduces the characteristics of loop heat pipes with different wicks: (i) sintered stainless steel and (ii) ceramic. The evaporator has a flat-rectangular assembly under gravity-assisted conditions. Water was used as a working fluid, and the performance of the LHP was analyzed in terms of temperatures at different locations of the LHP and thermal resistance. As to the results, a stable operation can be maintained in the range of 50 to 520 W for the LHP with the stainless-steel wick, matching the desired limited temperature for electronics of 85 °C at the heater surface at 350 W (129.6 kW·m −2 ). Results using the ceramic wick showed that a heater surface temperature of below 85 °C could be obtained when operating at 54 W (20 kW·m −2 ).

Suggested Citation

  • Kyaw Zin Htoo & Phuoc Hien Huynh & Keishi Kariya & Akio Miyara, 2021. "Experimental Study on Thermal Performance of a Loop Heat Pipe with Different Working Wick Materials," Energies, MDPI, vol. 14(9), pages 1-23, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2453-:d:543329
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    References listed on IDEAS

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    1. Ebrahimi, Khosrow & Jones, Gerard F. & Fleischer, Amy S., 2014. "A review of data center cooling technology, operating conditions and the corresponding low-grade waste heat recovery opportunities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 622-638.
    2. Chernysheva, M.A. & Yushakova, S.I. & Maydanik, Yu.F., 2014. "Copper–water loop heat pipes for energy-efficient cooling systems of supercomputers," Energy, Elsevier, vol. 69(C), pages 534-542.
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