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Journal articles on the topic 'Loop Heat Pipe (LHP)'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Putra, Nandy, Wayan Nata Septiadi, Rosari Saleh, Rardi Artono Koestoer, and Suhendro Purbo Prakoso. "The Effect of CuO-Water Nanofluid and Biomaterial Wick on Loop Heat Pipe Performance." Advanced Materials Research 875-877 (February 2014): 356–61. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.356.

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The determinants of heat pipe performances are its wick and working fluid, instead of controlled by the material, dimension, and the shape of heat pipe. This study aimed to determine the effect of using nanofluid on the performance of Loop heat pipes (LHP) with CuO-water nanofluid that using biomaterials wick. LHP was made of 8 mm diameter copper pipe, with the diameter of evaporator and the condenser was 20 mm respectively and the length of the heat pipe was 100 mm. The wick was made of biomaterials Collaria Tabulate and the working fluid was CuO-water nanofluids where the CuO nanoparticles w

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2

Asmara, Dimas Panji, Mukhsinun Hadi Kusuma, Giarno Giarno, and Darwin Rio Budi Syaka. "STUDI EKSPERIMEN PENGARUH WICK PIPA KAPILER PADA MODEL LOOP HEAT PIPE." SIGMA EPSILON - Buletin Ilmiah Teknologi Keselamatan Reaktor Nuklir 25, no. 2 (2021): 74. http://dx.doi.org/10.17146/sigma.2021.25.2.6365.

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Kecelakaan yang terjadi pada Pembangkait Listrik Tenaga Nuklir Fukushhima Dai – Ichi memacu para periset di bidang keselamatan nuklir untuk menggunakan sistem pendingin pasif dalam rangka meningkatkan keselamatan termal isntalasi nuklir. Salah satu teknologi sistem pendingin pasif yang potensial untuk diterapkan adalah Loop Heat Pipe (LHP) karena memiliki kemampuan pembuangan kalor yang baik. Tujuan penelitian ini adalah untuk mengetahui pengaruh performa wick berupa pipa kapiler dalam rangka meningkatkan unjuk kerja termal dan distribusi suhu pada LHP. Metode eksperimen dilakukan dengan mengo

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3

Fadillah, Rizky, Mukhsinun Hadi Kusuma, Giarno Giarno, and Ahmad Kholil. "STUDI PENGARUH FILLING RATIO PADA MODEL LOOP HEAT PIPE." SIGMA EPSILON - Buletin Ilmiah Teknologi Keselamatan Reaktor Nuklir 25, no. 2 (2021): 65. http://dx.doi.org/10.17146/sigma.2021.25.2.6366.

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Pembuangan panas sisa hasil peluruhan pada saat sistem pendingin aktif mengalami kegagalan masih menjadi permasalahan termal. Loop heat pipe (LHP) sebagai salah satu teknologi sistem pendingin pasif berpotensi untuk dimanfaatkan dalam menangani permasalahan termal tersebut. Tujuan studi ini adalah untuk mengetahui pengaruh filling ratio terhadap unjuk kerja termal model LHP yang dibuat pada berbagai variasi filling ratio yang diberikan dan fenomena perpindahan kalor yang terjadi di dalamnya. Metode eksperimen dilakukan dengan cara mengoperasikan LHP pada filling ratio 100 %, 150 % dan 200%. Da

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4

Dongxing, Gai, Sun Jingyu, Chen Chen, and Chen Ting. "Hysteresis phenomena in flat-type loop heat pipe." Thermal Science, no. 00 (2020): 166. http://dx.doi.org/10.2298/tsci191010166d.

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Testing of loop heat pipes (LHPs) showed that the heat-load dependence of the operating temperature was not always unambiguous. It may have hysteresis phenomena. The temperature hysteresis had a certain relationship with previous history of the power variation, and also related to the initial parameters of the LHP. It has been found that the temperature hysteresis of the LHP was related to the gas-liquid distribution in the compensation chamber (CC) which depended on the interaction between heat leak of evaporator and the reflux liquid from condenser. The temperature of the LHP evaporator rose

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5

Nemec, Patrik, Martin Smitka, and Milan Malcho. "Heat Removal from Bipolar Transistor by Loop Heat Pipe with Nickel and Copper Porous Structures." Scientific World Journal 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/724740.

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Loop heat pipes (LHPs) are used in many branches of industry, mainly for cooling of electrical elements and systems. The loop heat pipe is a vapour-liquid phase-change device that transfers heat from evaporator to condenser. One of the most important parts of the LHP is the porous wick structure. The wick structure provides capillary force to circulate the working fluid. To achieve good thermal performance of LHP, capillary wicks with high permeability and porosity and fine pore radius are expected. The aim of this work was to develop porous structures from copper and nickel powder with differ

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6

Gabsi, Inès, Samah Maalej, and Mohamed Chaker Zaghdoudi. "Modeling of Loop Heat Pipe Thermal Performance." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 81, no. 1 (2021): 41–72. http://dx.doi.org/10.37934/arfmts.81.1.4172.

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The present work deals with the heat transfer performance of a copper-water loop heat pipe (LHP) with a flat oval evaporator in steady-state operation. Modeling the heat transfer in the evaporator was particularly studied, and the evaporation heat transfer coefficient was determined from a dimensionless correlation developed based on experimental data from the literature. The model was based on steady-state energy balance equations for each LHP component. The model results were compared to the experimental ones for various heat loads, cooling temperatures, and elevations, and a good agreement

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7

Wu, Shen Chun, Jhih Huang Gao, Zih Yan Huang, et al. "Effect of Increasing Wick Evaporation Area on Heat Transfer Performance for Loop Heat Pipes." Advanced Materials Research 711 (June 2013): 223–28. http://dx.doi.org/10.4028/www.scientific.net/amr.711.223.

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This study investigates the effects of increasing the evaporating area of wick in a loop heat pipe (LHP). This work attempts to improve the performance of the loop heat pipe by increasing the number of grooves and thereby the surface area of the wick. The number of grooves is increased from eight to twelve. Experimental results show that increasing the number of grooves not only increases the surface area of the wick but also enhances LHP performance. When the evaporating surface area increases by 50%, which corresponds to increasing the number of grooves from eight to twelve, the heat transfe

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8

Nedaivozov, A. V., and V. N. Afanasiev. "Experimental Investigation of the Operation Modes of a Flat Loop Heat Pipe." Mechanical Engineering and Computer Science, no. 1 (March 1, 2019): 1–12. http://dx.doi.org/10.24108/0119.0001448.

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The paper presents the experimentally investigated operation modes of a flat loop heat pipe (LHP). The LHP is an efficient heat transfer device operating on the principle of evaporation-condensation cycle and successfully applied in space technology, including cooling heat-stressed components of electronic devices and computer equipment.We have experimentally studied how design parameters of the vapor line and its coolant flow influence on the LHP operation mode and also have determined the causes for emerging oscillatory mode of the LHP operation at low heat load. The paper depicts the experi

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9

Rong, Yangyiming, Weitao Su, Shuai Wang, Bowen Du, Zujun Mao, and Shaozhi Zhang. "Investigation of a Gas-Pump-Driven Loop Heat Pipe." Energies 17, no. 21 (2024): 5283. http://dx.doi.org/10.3390/en17215283.

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A loop heat pipe (LHP) is an efficient method of conserving energy in data center cooling applications. In scenarios where the installation is constrained by height or distance limitations, pump driving is needed. This paper examines the performance changes induced by a gas pump both experimentally and theoretically. An adjustable, oil-free linear compressor is utilized as a gas pump. The evaporator is a finned-tube heat exchanger and the condenser is a water-cooled plate heat exchanger. When the filling ratio of the working fluid is insufficient, employing a gas pump can enhance the heat tran

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10

Zhang, Xian Feng, and Shuang Feng Wang. "Experimental Investigation of Heat Transfer Performance of a Miniature Loop Heat Pipe with Flat Evaporator." Applied Mechanics and Materials 71-78 (July 2011): 3806–9. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3806.

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The present work experimentally investigated the operating characteristics of a miniature loop heat pipe (LHP) under different power cycle. The miniature LHP with flat evaporator of 8mm thick is made of copper. The evaporator with sintered copper power wick is in series structure with compensation chamber. Water is working fluid. It is found that the LHP can start up at heat load of 15W with temperature oscillation and the maximum heat load is 160W with Rl=0.068°C/W. The LHP operates unstably under low heat load. The oscillating frequency of temperature rises with heat load increased. The oper

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11

Yang, Yang, Zhu Kai, Wang Yabo, Wei Jie, and Sarula Chen. "Experimental analysis of a Vapour-Liquid Separated Flat Loop Heat Pipe Evaporator System." MATEC Web of Conferences 307 (2020): 01055. http://dx.doi.org/10.1051/matecconf/202030701055.

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In this paper, a unique operation mechanism of loop heat pipe (LHP) was proposed. To test the performance of LHP under this new mechanism, a visual flat LHP evaporator prototype and an open experimental system were designed and assembled, and start-up experiment and variable heat load experiment were done respectively to obtain the actual operation characteristics, such as the evaporator thermal resistance (Re), total thermal resistance (Rt), start-up time and temperature of base plate. The proposed LHP had better overall performance during the start-up tests when He value of EC was set to 0.5

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12

Haryanto, Dedy, Giarno Giarno, Sumantri Hatmoko, Yoyok Dwi Setyo Pambudi, and M. Hadi Kusuma. "Thermal Resistance of the Loop Heat Pipe Prototype in Steady State Conditions." Semesta Teknika 26, no. 2 (2023): 214–21. http://dx.doi.org/10.18196/st.v26i2.18788.

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The nuclear accident at the Fukushima Daiichi nuclear power plant in March 2011 in Japan caused a tsunami and submerged the emergency diesel generator resulting in a station blackout (SBO). Based on the accident, a study was conducted on the use of passive safety systems as a support for active safety systems in nuclear reactor cooling systems. The Loop Heat Pipe (LHP) prototype is a small-scale LHP research facility, one of which is used to determine the characteristics and heat transfer events in LHP. Calculations to determine the thermal resistance of the LHP prototype need to be carried ou

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13

Chen, Yan, Wei Chang, Shu Sheng Zhang, and Chun Sheng Guo. "Steady Sate Modeling of LHP and Analysis." Advanced Materials Research 430-432 (January 2012): 1834–38. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1834.

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An ammonia-stainless steel steady state modeling of loop heat pipe was established, the impacts on the LHP operating temperature induced by alterable heat loads under 3 operating cases (the different position between evaporator and condenser, the changing of ambient temperature and the changing of heat sink temperature) were analyzed and conclusions were made. Changing the position between evaporator and condenser has a significant influence on the LHP operating temperature. Anti-gravity operation will reduce the performance of the LHP, this phenomenon is obviously in low heat load range. Furt

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14

Nugraha, Aziz Yudha, Mukhsinun Hadi Kusuma, Giarno Giarno, and Wardoyo Wardoyo. "STUDI EKSPERIMEN PENGARUH BEBAN KALOR TERHADAP UNJUK KERJA TERMAL MODEL LOOP HEAT PIPE." SIGMA EPSILON - Buletin Ilmiah Teknologi Keselamatan Reaktor Nuklir 25, no. 2 (2021): 84. http://dx.doi.org/10.17146/sigma.2021.25.2.6368.

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Sistem pendingin pasif sangat diperlukan sebagai redundance apabila sistem pendingin aktif pada instalasi nuklir mengalami kegagalan operasi. Konspe teknologi sistem pendinginan pasif yang potensial digunakan dalam menyerap dan membuang kalor dengan baik adalah loop heat pipe (LHP). Diharapkan LHP menjadi solusi manajemen termal dalam keselamatan pengoperasian instalasi nuklir. Tujuan studi eksperimen ini adalah untuk mengetahui fenomena perpindahan kalor yang terjadi di dalam model LHP yang dibuat sendiri dan bagaimana unjuk kerja termalnya dalam menyerap dan melepas kalor. Metode yang diguna

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15

Martvoňová, Lucia, Milan Malcho, Jozef Jandačka, et al. "Enhancing Small Heat Source Performance through Gravitational Loop Heat Pipes." Machines 11, no. 8 (2023): 813. http://dx.doi.org/10.3390/machines11080813.

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This experimental study aimed to validate the integration of a gravitational loop heat pipe (GLHP) with respect to a gas fireplace insert. The GLHP was utilized to enhance the efficiency of the fireplace by preheating the combustion air with waste heat from flue gases. The experiment involved monitoring key parameters such as vapor and condensate temperatures and absolute pressure within the LHP. The results demonstrated that a filling volume of 0.1 L of water in the LHP allowed for successful operation, while exceeding 0.2 L resulted in flooding and decreased system efficiency. Challenges rel

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16

Gakal, P., D. Mishkinis, A. Leilands, I. Usakovs, R. Orlov, and Y. Rogoviy. "Analysis of working fluids applicable for high-temperature loop heat pipe applications." IOP Conference Series: Materials Science and Engineering 1226, no. 1 (2022): 012036. http://dx.doi.org/10.1088/1757-899x/1226/1/012036.

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Abstract An objective of this study was to perform an analysis of available working fluids and select those one(s) that will be able to comply with the specific requirements of the ultra-high bypass ratio (UHBR) engine air bleed system and ensure efficient LHP operation. A multi-step approach was applied to analyse more than 700 working fluids and select four potential candidates, taking into account (1) working fluids compliance with EU regulations; (2) working fluids freezing, boiling, and critical points for the operating temperature range; (3) working fluids specific properties that influe

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17

Lin, Bingyao, Rongjian Xie, and Leren Tao. "Study of the heat transfer performance of a loop heat pipe with aluminum wick." Thermal Science, no. 00 (2021): 248. http://dx.doi.org/10.2298/tsci200904248l.

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This study used aluminum (Al) powder as a raw material to fabricate a wick for loop heat pipes (LHPs) by the powder metallurgy method and took advantage of the excellent corrosion resistance, low density and low cost of Al. The average pore diameter, porosity and permeability of the Al wicks were 9 ?m, 47.65%, and 2.1?10-13 m-2, respectively. Then, to verify the feasibility of the Al wick, it was installed into a LHP to test the heat transfer performance. The experimental results showed that the LHP could transport a heating load of 130 W with a thermal resistance of 0.04 KW-1 under horizontal

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18

Gao, Jhih-Huang, Shen-Chun Wu, Ya-Wei Lee, Ta-Li Chou, and Yan-Chun Chen. "The Study of Novel Self-Rewetting Fluid Application to Loop Heat Pipe." Applied Sciences 12, no. 6 (2022): 3121. http://dx.doi.org/10.3390/app12063121.

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The purpose of this paper is to develop SRF formulations for LHP performance enhancement. In this paper, the solute of SRF is prepared, and butanol and its isomer, 2-butanol, are selected. In this paper, concentrations of the 2-butanol aqueous solution (10%, 15%, and 20%) plus the butanol 6% aqueous solution were used to measure the surface tension of four different formulations of SRF and water. It was found that the higher the solute concentration became, the stronger the Marangoni effect was, and the more obvious the surface tension change of the 2-butanol 20% aqueous solution was. Water, t

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19

Cai, Bing, Weizhong Deng, Tong Wu, et al. "Experimental Study of a Loop Heat Pipe with Direct Pouring Porous Wick for Cooling Electronics." Processes 9, no. 8 (2021): 1332. http://dx.doi.org/10.3390/pr9081332.

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A pouring silicate wick was manufactured to explore the influence of process and physical properties on the production and performance of loop heat pipes (LHP). This paper theoretically analyzed the advantages of pouring porous wick and introduced the technology of pouring silicate directly on evaporator. Based on this, the heat transfer performance of copper-methanol LHP system with pouring porous wick was tested under different positions. The results showed that with the input of multiple heat sources, the LHP could start up and maintain a stable temperature from 40 W to 160 W. When the vapo

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20

Reynaldi, Rifa, Mukhsinun Hadi Kusuma, Giarno Giarno, and Dyah Arum Wulandari. "STUDI PENGARUH LAJU ALIRAN UDARA PENDINGIN PADA CONDENSER TERHADAP DISTRIBUSI SUHU MODEL LOOP HEAT PIPE." SIGMA EPSILON - Buletin Ilmiah Teknologi Keselamatan Reaktor Nuklir 25, no. 2 (2021): 54. http://dx.doi.org/10.17146/sigma.2021.25.2.6371.

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Penggunaan sistem pendingin pasif perlu ditingkatkan dalam rangka meningkatkan keselamatan operasi instalasi nuklir. Salah satu teknologi sistem pendingin pasif yang berpotensi untuk digunakan adalah loop heat pipe (LHP). Tujuan studi eksperimen ini adalah mempelajari pengaruh besarnya laju aliran udara pendingin terhadap pembuangan kalor oleh model LHP, dan mempelajari fenomena perpindahan kalor yang terjadi di dalamnya. Dalam studi ini peneliti melakukan eksperimen dengan mengoperasikan model LHP pada berbagai variasi laju aliran pendinginan udara sebesar 0 m/s, 1 m/s, 1,5 m/s dan 2 m/s. Pem

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21

Htoo, Kyaw Zin, Phuoc Hien Huynh, Keishi Kariya, and Akio Miyara. "Experimental Study on Thermal Performance of a Loop Heat Pipe with Different Working Wick Materials." Energies 14, no. 9 (2021): 2453. http://dx.doi.org/10.3390/en14092453.

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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 i

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22

Huynh, Hien Phuoc, Htoo Zin Kyaw, Keishi Kariya, and Akio Miyara. "Experimental Study on Thermal Performance of Loop Heat Pipe with Flat-Rectangular Evaporator Under Gravity Assisted Condition." EPI International Journal of Engineering 1, no. 2 (2018): 40–46. http://dx.doi.org/10.25042/epi-ije.082018.06.

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In company with extreme developments of electronic devices, there are some unavoidable challenges to the conventional cooling methods such as high heat dissipation, limitation of cooling space, reliable operation as well as saving energy consumption. Therefore, the necessity of studying on new or how to improve the existing technologies is undoubted. Among various methodologies, the loop heat pipe (LHP) whose operation principle base on phase changing process, can be considered as one of the potential solutions of modern electronics cooling. This paper introduces the experimental investigation

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23

Gakal, Pavlo, Igor Rybalchenko, Oleksii Tretyak, and Viacheslav Nazarenko. "Experimental investigation of the performance of a loop heat pipe-based cooling system under ultra-high dypass ratio turbojet engine conditions." Aerospace Technic and Technology, no. 1 (January 23, 2025): 14–27. https://doi.org/10.32620/aktt.2025.1.02.

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The subject of this article is the heat transfer processes in a loop heat pipe (LHP) to solve the problem of maintaining the temperature regime of the valves of the air-bleeding system of an aircraft engine. The goal was to experimentally substantiate the operability and efficiency of a cooling system based on LHP for the temperature conditions of a perspective aircraft engine with an ultra-high bypass ratio. The task to be solved: to create a test bench for studying heat transfer processes in cooling systems based on LHP. The test bench should reproduce the temperature of the aircraft engine

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24

Wu, Shen Chun, Chuo Jeng Huang, and Jhih Huang Gao. "Effect of Filling Powder Volume Rate in Wick Manufactured for Loop Heat Pipes." Advanced Materials Research 488-489 (March 2012): 321–27. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.321.

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This investigation studies the effect on pressure of the filling volume rate in a manufactured nickel powder capillary structure (wick) for a loop heat pipe (LHP). The filling volume ratio is an index of pressure from 1 to 1.3 to investigate the influence on filling weights of the internal parameters of a wick (permeability, effective pore radius and porosity) and heat transfer performance for LHP. The wick is manufactured, based on the standard and non-pressurized filling weights in the manufactured wick mold. The conversion of a pressure change to a weight change used to investigate the rela

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25

Szymanski, Pawel, Richard Law, Ryan MᶜGlen, and David Reay. "Recent Advances in Loop Heat Pipes with Flat Evaporator." Entropy 23, no. 11 (2021): 1374. http://dx.doi.org/10.3390/e23111374.

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The focus of this review is to present the current advances in Loop Heat Pipes (LHP) with flat evaporators, which address the current challenges to the wide implementation of the technology. A recent advance in LHP is the design of flat-shaped evaporators, which is better suited to the geometry of discretely mounted electronics components (microprocessors) and therefore negate the need for an additional transfer surface (saddle) between component and evaporator. However, various challenges exist in the implementation of flat-evaporator, including (1) deformation of the evaporator due to high i

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26

Jung, Eui Guk, and Joon Hong Boo. "A Novel Analytical Modeling of a Loop Heat Pipe Employing the Thin-Film Theory: Part I—Modeling and Simulation." Energies 12, no. 12 (2019): 2408. http://dx.doi.org/10.3390/en12122408.

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In this study, steady-state analytical modeling of a loop heat pipe (LHP) equipped with a flat evaporator is presented to predict the temperatures and pressures at each important part of the LHP—evaporator, liquid reservoir (compensation chamber), vapor-transport tube, liquid-transport tube, and condenser. Additionally, this study primarily focuses on analysis of the evaporator—the only LHP component comprising a capillary structure. The liquid thin-film theory is considered to determine pressure and temperature values concerning the region adjacent to the liquid-vapor interface within the eva

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Jung, Eui Guk, and Joon Hong Boo. "A Novel Analytical Modeling of a Loop Heat Pipe Employing Thin-Film Theory: Part II—Experimental Validation." Energies 12, no. 12 (2019): 2403. http://dx.doi.org/10.3390/en12122403.

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Part I of this study introduced a mathematical model capable of predicting the steady-state performance of a loop heat pipe (LHP) with enhanced rationality and accuracy. Additionally, investigation of the effect of design parameters on the LHP thermal performance was also reported in Part I. The objective of Part II is to experimentally verify the utility of the steady-state analytical model proposed in Part I. To this end, an experimental device comprising a flat-evaporator LHP (FLHP) was designed and fabricated. Methanol was used as the working fluid, and stainless steel as the wall and tubi

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28

Ivanovskis, L., and D. Mishkinis. "Review of “cold shock” cases in operation of loop heat pipes and related thermal instabilities." Journal of Physics: Conference Series 2766, no. 1 (2024): 012025. http://dx.doi.org/10.1088/1742-6596/2766/1/012025.

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Abstract Loop Heat Pipes (LHP) are passive two-phase heat transfer devices, driven by capillary pumps that source energy for circulation of working fluid solely from the heat source. They have a proven track record in spacecraft thermal control as well as terrestrial applications. However, LHP may experience partial or complete wick dryout and thermal instabilities at rapid power-up steps or (and) rapid condenser cooling conditions change due to a rapid inflow of subcooled liquid from the condenser into the evaporator. Such cases do not have very wide coverage in literature and are usually pre

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29

Szymanski, Pawel, Dariusz Mikielewicz, and Sasan Fooladpanjeh. "Current Trends in Wick Structure Construction in Loop Heat Pipes Applications: A Review." Materials 15, no. 16 (2022): 5765. http://dx.doi.org/10.3390/ma15165765.

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Thermal control systems have been introduced as an important part of electronic devices, enabling thermal management of their electronic components. Loop heat pipe (LHP) is a passive two-phase heat transfer device with significant potential for numerous applications, such as aerospace applications, high-power LEDs, and solar central receivers. Its advantages are high heat transfer capability, low thermal resistance, long-distance heat transfer, and compact structure. The essential role of wick structures on the performance of LHPs has already been highlighted, but no comprehensive review is av

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Zhao, Yihang, Mingshan Wei, and Dan Dan. "Modeling, Design, and Optimization of Loop Heat Pipes." Energies 17, no. 16 (2024): 3971. http://dx.doi.org/10.3390/en17163971.

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Thermal management technology based on loop heat pipes (LHPs) has broad application prospects in heat transfer control for aerospace and new energy vehicles. LHPs offer excellent heat transfer performance, reliability, and flexibility, making them suitable for high-heat flux density, high-power heat dissipation, and complex thermal management scenarios. However, due to limitations in heat source temperature and heat transfer power range, LHP-based thermal management systems still face challenges, especially in thermohydraulic modeling, component design, and optimization. Steady-state models im

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31

Riehl, Roger R. "ADVANCED TWO-PHASE PASSIVE THERMAL CONTROL DEVICES: LOOP HEAT PIPES AND PULSATING HEAT PIPES." Revista de Engenharia Térmica 5, no. 1 (2006): 54. http://dx.doi.org/10.5380/reterm.v5i1.61661.

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This paper presents the development of two-phase passive thermal control devices that can be used at both ground and space applications. These devices operate by acquiring heat through their evaporation section and rejecting through their condensation section, keeping a tight control on the heat source temperature without the presence of moving parts. Recent researches with loop heat pipes (LHPs) have showed the great capability of such a device in managing high levels of heat while keeping the source temperature within certain levels. For this case, experimental tests of a LHP are presented,

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32

Zhu, Kai, Xueqiang Li, Hailong Li, Xiaoqing Chen, and Yabo Wang. "Optimization of A Loop Heat Pipe (LHP) with Wick Separated from Heating Surface." Energy Procedia 158 (February 2019): 2409–16. http://dx.doi.org/10.1016/j.egypro.2019.01.293.

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Monticelli, Michele, Antonella Accardo, Marco Bernagozzi, and Ezio Spessa. "A Comparative Life Cycle Analysis of an Active and a Passive Battery Thermal Management System for an Electric Vehicle: A Cold Plate and a Loop Heat Pipe." World Electric Vehicle Journal 16, no. 2 (2025): 100. https://doi.org/10.3390/wevj16020100.

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This study extends beyond conventional Battery Thermal Management System (BTMS) research by conducting a Life Cycle Analysis comparing the environmental impacts of two technologies: a traditional active cold plate system and an innovative passive Loop Heat Pipe (LHP) system. While active cold plate BTMS requires continuous energy input during operation and charging, leading to significant energy consumption and emissions, the passive LHP BTMS operates without external power or moving parts, substantially reducing the climate change impact. This analysis considered two materials for LHP constru

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Lu, Pan, Teng Gao, Quanwang Chen, and Xiaohan Ren. "Energy Saving Thermal Management of Space Remote Sensor and Validation." Energies 16, no. 2 (2023): 864. http://dx.doi.org/10.3390/en16020864.

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An energy-efficient thermal control management method for space remote sensors using optical, mechanical, electrical, and thermal integration is proposed. The satellite power resources are insufficient, so an energy-efficient loop heat pipe (LHP) is designed for six intermittently operating detectors. The charge-coupled device (CCD) has a total heat generation of 72 W and operates for 8 min per orbital cycle. The LHP includes a capillary pump, six cold plates, and two radiators. The working fluid of the LHP is high-purity ammonia and the material of the wick is ceramic. The drive power on the

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Berti, Lucas Freitas, Paulo Henrique Dias dos Santos, Carlos Renato Rambo, Dachamir Hotza, and Edson Bazzo. "Steady State Thermal Behaviour of Ceramic Wick Structure for Application in Two Phase Heat Transfer Devices." Advanced Materials Research 1082 (December 2014): 302–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1082.302.

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This work reports on results from two phase heat transfer devices assembled with ceramic capillary structure. It is firstly presented the manufacturing of the ceramic wick structures and afterwards the characterization of the morphological-and fluid-dynamical properties of these ceramic wick structures. As closing results, it is presented the thermal behaviour of two different two phase heat transfer devices, i.e. a Capillary Pumped Loop and a Loop Heat Pipe. The properties of the ceramic wick structure are within the desirable range for a correct functioning of these devices, e.g. porosity, p

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Wu, Shen Chun, Kuei Chi Lo, Jia Ruei Chen, Chen Yu Chung, Weie Jhih Lin, and Shen Jwu Su. "Effect of Sintering Temperature Curve in Wick Manufactured for Loop Heat Pipe with Flat Evaporator." Applied Mechanics and Materials 595 (July 2014): 24–29. http://dx.doi.org/10.4028/www.scientific.net/amm.595.24.

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This paper specifically addresses the effect of the sintering temperature curve in manufacturing nickel powder capillary structure (wick) for a loop heat pipe (LHP) with flat evaporator. The sintering temperature curve is composed of three regions: a region of increasing temperature, a region of constant temperature, and a region of decreasing temperature. The most important region is the increasing temperature region, as the rate of temperature increase directly affects the performance of the wick.When the slope of the region of increasing temperature is 0.8 (equivalent to 8 OC/min), the stru

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Кисеев, В. М., та О. В. Сажин. "Интенсификация теплопередачи в двухфазных системах с капиллярными насосами". Журнал технической физики 92, № 1 (2022): 22. http://dx.doi.org/10.21883/jtf.2022.01.51847.221-21.

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Heat transfer in capillary pumped loops (CPL) is carried out by transferring the mass of the circulating coolant in the form of liquid and vapor. Therefore, the hydrodynamics of the phases in the CPL determines their heat transfer capacity (heat flow or the product of the heat flow by the heat transfer length). The influence of structural, hydraulic and thermo-physical properties of capillary structures used as capillary pumps in two-phase thermal control systems (Loop Heat Pipes - LHP) on their heat transfer capacity has been analyzed. Methods of increasing the heat transfer capacity of LHP,

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Zhang, Tao, Gang Pei, Qunzhi Zhu, and Jie Ji. "Experimental study of a novel photovoltaic solar-assisted heat pump/loop heat-pipe (PV-SAHP/LHP) system." IOP Conference Series: Earth and Environmental Science 52 (January 2017): 012017. http://dx.doi.org/10.1088/1742-6596/52/1/012017.

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Blauciak, Krzysztof, Pawel Szymanski, and Dariusz Mikielewicz. "The Influence of Loop Heat Pipe Evaporator Porous Structure Parameters and Charge on Its Effectiveness for Ethanol and Water as Working Fluids." Materials 14, no. 22 (2021): 7029. http://dx.doi.org/10.3390/ma14227029.

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This paper presents the results of experiments carried out on a specially designed experimental rig designed for the study of capillary pressure generated in the Loop Heat Pipe (LHP) evaporator. The commercially available porous structure made of sintered stainless steel constitutes the wick. Three different geometries of the porous wicks were tested, featuring the pore radius of 1, 3 and 7 µm. Ethanol and water as two different working fluids were tested at three different evaporator temperatures and three different installation charges. The paper firstly presents distributions of generated p

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Zheng, Suzheng, Binyao Lin, Chenyang Zhao, Xue Zhou, Nanxi Li, and Deping Dong. "Numerical Investigation with Experimental Validation of Heat and Mass Transfer during Evaporation in the Porous Wick within a Loop Heat Pipe." Energies 16, no. 5 (2023): 2088. http://dx.doi.org/10.3390/en16052088.

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The heat transfer performance of the evaporator significantly affects the heat transfer capacity of the loop heat pipe (LHP). The vapor blanket can be formed once the vapor penetrates the wick especially at high heat flux, resulting in an unsaturated state of the wick and deteriorating the evaporator performance. It is crucial to understand the liquid–vapor behavior for enhancing the LHP performance by investigating the fundamental heat and mass transfer in the wick with phase-change. However, previous modeling studies only considered a single-phase flow or complete saturation in the wick, and

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Huang, Jin, Liang Chang, Baiyang Dong, Jianping Wang, and Hulin Huang. "Variable Switching System for Heat Protection and Dissipation of Ultra-LEO Satellites Based on LHP Coupled with TEC." Aerospace 11, no. 7 (2024): 539. http://dx.doi.org/10.3390/aerospace11070539.

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Ultra-low Earth orbit (LEO) satellites are widely used in the military, remote sensing, scientific research, and other fields. The ultra-LEO satellite faces the harsh aerothermal environment, and the complex variable attitude task requires the radiator of the satellite to not only meet the heat dissipation requirements of the load but also to resist aerothermal flux. In this study, the aerothermal flux of 160–110 km was calculated, and the loop heat pipe (LHP) coupled with a thermo-electric cooler (TEC) and multi-layer insulation (MLI) were applied to ultra-LEO satellites to determine the vari

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Ling, Li, Yijun Xia, Li Zhao, et al. "Experimental investigation on the thermal performance of a novel loop heat pipe (LHP) with micro-channel structure." Applied Thermal Engineering 238 (February 2024): 122046. http://dx.doi.org/10.1016/j.applthermaleng.2023.122046.

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Wu, Shen Chun, Shih Syuan Yan, Chen Yu Chung, and Shen Jwu Su. "The Study of PTFE Wicks Application to Loop Heat Pipes with Flat Evaporator." Applied Mechanics and Materials 775 (July 2015): 54–58. http://dx.doi.org/10.4028/www.scientific.net/amm.775.54.

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This study investigates the application of PTFE wicks to flat-plate loop heat pipes (FLHPs). PTFE’s low heat transfer coefficient effectively prevents heat-leakage, which is a problem with using metal wicks, lowering the operating temperature and pressure. This paper uses PTFE particles to form wicks, and the effect of PTFE on flat-plate LHP performance is investigated. Experimental results shows that the highest heat load reached was 100W, with lowest thermal resistance of 0.61°C/W, and heat flux of about 10W/cm2, For the wick properties, the wick had an effective pore radius of the wick was

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Szymański, Paweł, Piotr Radomski, Jae-Ho Jeon, and Dariusz Mikielewicz. "Analysis of Key Material Parameters of Evaporator Wicks and Working Fluids for a Loop Heat Pipe Operating in the Temperature Range of 500–700 K." Materials 18, no. 12 (2025): 2798. https://doi.org/10.3390/ma18122798.

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This study presents a preliminary evaluation of candidate wick material and working fluid for a flat-loop heat pipe (F-LHP) designed to operate within the temperature range of 500–700 K. The selection process considered key thermal and physical parameters, including thermal conductivity, chemical compatibility between wick and fluid, capillary pressure generation, pressure drop across the wick structure, and structural integrity at elevated temperatures. A range of metallic and ceramic wick materials, along with suitable high-temperature working fluids, were reviewed and compared based on perf

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Liu, Xuexiang, Haowen Liu, Xudong Zhao, Zhonghe Han, Yu Cui, and Min Yu. "A novel neural network and grey correlation analysis method for computation of the heat transfer limit of a loop heat pipe (LHP)." Energy 259 (November 2022): 124830. http://dx.doi.org/10.1016/j.energy.2022.124830.

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Zhu, Kai, Xiaoqing Chen, Baomin Dai, Mingzhu Zheng, Yabo Wang, and Hailong Li. "Operation characteristics of a new-type loop heat pipe (LHP) with wick separated from heating surface in the evaporator." Applied Thermal Engineering 123 (August 2017): 1034–41. http://dx.doi.org/10.1016/j.applthermaleng.2017.05.140.

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Yu, Min, Fucheng Chen, Siming Zheng, et al. "Experimental Investigation of a Novel Solar Micro-Channel Loop-Heat-Pipe Photovoltaic/Thermal (MC-LHP-PV/T) System for Heat and Power Generation." Applied Energy 256 (December 2019): 113929. http://dx.doi.org/10.1016/j.apenergy.2019.113929.

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Yuan, Tianhao, Zeyu Liu, Linlin Zhang, Suiju Dong, and Jilong Zhang. "The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings." Processes 11, no. 11 (2023): 3081. http://dx.doi.org/10.3390/pr11113081.

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An air-conditioning system (ACS), which consumes large amounts of high-grade energy, is essential for maintaining the indoor thermal environment of modern buildings. However, an ACS consumes almost half of the total energy of the building. Therefore, it is necessary to reduce the energy consumption of the ACS to promote energy conservation and emission reduction in the building sector. In fact, there is an abundance of waste heat and low-grade energies with the potential to be utilized in ACS in nature, but many of them are not utilized efficiently or cannot be utilized at all due to the low e

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Zhang, Xingxing, Jingchun Shen, Deborah Adkins, et al. "The early design stage for building renovation with a novel loop-heat-pipe based solar thermal facade (LHP-STF) heat pump water heating system: Techno-economic analysis in three European climates." Energy Conversion and Management 106 (December 2015): 964–86. http://dx.doi.org/10.1016/j.enconman.2015.10.034.

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Chen, Yan, Yan Qu, and Shu Sheng Zhang. "Design and Simulation of Visual Miniature Loop Heat Pipe." Advanced Materials Research 605-607 (December 2012): 346–51. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.346.

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A miniature loop heat pipe (MLHP) with a glass condenser was designed and manufactured. Stress analysis on compensation chamber/evaporator and glass condenser is made to confirm strength of loop heat pipe using the software MSC NASTRAN. Results indicate this new structure loop heat pipe can meet the design requirements and secure to work well. A system level performance analysis was made about heat transfer and fluid flow characteristics inside loop heat pipe using the software of SINDA/FLUINT. This miniature loop heat pipe realized visualization research of phase change phenomenon to some ext

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