Experimental Investigation Thermal Performance of Loop Heat Pipe Operating with Different Working Fluids


Electronics cooling, Loop heat pipe, Working fluids, Gravity assisted condition, Water, Ethanol, Boiling heat transfer, Condensation heat transfer.

How to Cite

Phuoc Hien Huynh, Kyaw Zin Htoo, Keishi Kariya, Akio Miyara. Experimental Investigation Thermal Performance of Loop Heat Pipe Operating with Different Working Fluids. J. Adv. Therm. Sci. Res. [Internet]. 2019 Jun. 10 [cited 2022 May 18];6(1):19-30. Available from: https://www.avantipublishers.com/index.php/jatsr/article/view/877


 Nowadays, due to the tremendous development of data centers (DCs), studying the effective cooling methods that can face to the challenges such as the high power or heat flux dissipation and the efficient electricity consumption in DCs has never been unnecessary. Loop heat pipe (LHP), a two-phase heat transfer device, is being considered as one of the potential solutions for the above problems. This paper introduces the experimental study on the thermal performances of LHP functioning under gravity assisted condition with different working fluids that are water and ethanol (C2H5OH). This LHP has the flat-rectangular evaporator with the stainless-steel (SS) sintering wick installed inside. The results demonstrate that under the same condenser cooling condition, water LHP performed better than ethanol LHP. In the case of water LHP, when heating power was increased from 33 to 535 W, the temperature at the top surface of the heating block raised from 38oC to 110oC. With the ethanol LHP, this temperature reached 133oC at the heating power of 395 W. If temperature limitation of microprocessors functioning inside the DCs is recognized at 85oC, the cooling capabilities of LHP are 220 W and 350 W corresponding to the working fluid are ethanol and water respectively. In addition, the discussions about the difference in boiling heating transfer characteristics as well as condenser performances between water LHP and ethanol LHP are also presented in this study.


Sohel Murshed SM and Nieto de Castro CA. A critical review of traditional and emerging techniques and fluids for electronics cooling. Renew. Sustain. Energy Rev 2017; 78: 821-33. https://doi.org/10.1016/j.rser.2017.04.112

Nadjahi C, Louahlia H and Lemasson S. Sustainable Computing : Informatics and Systems. Sustain. Comput. Informatics Syst 2018; 19: 14-28. https://doi.org/10.1016/j.suscom.2018.05.002

Habibi A and Halgamuge SK. A Review on e ffi cient thermal management of air- and liquid-cooled data centers : From chip to the cooling system. Appl Energy 2017; 205: 1165-88. https://doi.org/10.1016/j.apenergy.2017.08.037

Zhang H, Shao S, Xu H, Zou H and Tian C. Free cooling of data centers : A review 2014; 35: 171-82.

Maydanik YF. Loop heat pipes. Applied Thermal Engineering 2005; 25: 635-657. https://doi.org/10.1016/j.applthermaleng.2004.07.010

Launay S, Sartre V and Bonjour J. Parametric analysis of loop heat pipe operation : a literature review. International Journal of Thermal Sciences 2007; 46: 621-36. https://doi.org/10.1016/j.ijthermalsci.2006.11.007

David Reay RM, Peter Kew. Heat Pipe Theory, Design, and Applications, 6th ed. Butterworth-Heinemann 2014.

SMC Cooperation, Sintered metal element (EB/ES Series) pp. 103-118 https://www.smcworld.com/products/- en/s.do?ca_id=537 (accessed Nov. 27th,2017)

Ebrahimi K, Jones GF and Fleischer AS. A review of data center cooling technology, operating conditions and the corresponding low-grade waste heat recovery opportunities. Renew. Sustain. Energy Rev 2014; 31: 622-38. https://doi.org/10.1016/j.rser.2013.12.007

Incropera DP, Frank P, DeWitt. Fundementals of heat and mass transfer. 6th ed. John Wiley & Sons 2007.

Phuoc Hien Huynh, Kyaw Zin Htoo, Tuhin AR, Keishi Kariya. Akio Miyara "Experimental study on thermal performance and boiling heat transfer of loop heat pipe operating under gravity assisted condition," in 2017 JSRAE Annual Conference, p. E221.

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Copyright (c) 2019 Phuoc Hien Huynh, Kyaw Zin Htoo, Keishi Kariya, Akio Miyara