Experimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation

The installation and operation of enhanced geothermal systems (EGS) involves many challenges. These challenges include the high cost and high risk associated with the investment capital, potential large working-fluid leakage, corrosion of equipment, and subsiding land. A super-long heat pipe can be...

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Autores principales:	Jiwen Cen, Feng Li, Tingliang Li, Wenbo Huang, Juanwen Chen, Fangming Jiang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	super-long gravity heat pipe geothermal energy exploitation phase-change heat transfer two phase flow length-diameter ratio Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/00ad1b38039445d1b051f62f3d2a938b
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spelling	oai:doaj.org-article:00ad1b38039445d1b051f62f3d2a938b2021-11-25T19:01:26ZExperimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation10.3390/su1322124812071-1050https://doaj.org/article/00ad1b38039445d1b051f62f3d2a938b2021-11-01T00:00:00Zhttps://www.mdpi.com/2071-1050/13/22/12481https://doaj.org/toc/2071-1050The installation and operation of enhanced geothermal systems (EGS) involves many challenges. These challenges include the high cost and high risk associated with the investment capital, potential large working-fluid leakage, corrosion of equipment, and subsiding land. A super-long heat pipe can be used for geothermal exploitation to avoid these problems. In this paper, a high aspect-ratio heat pipe (30 m long, 17 mm in inner diameter) is installed vertically. Experiments are then carried out to study its heat-transfer performance and characteristics using several filling ratios of deionized water, different heating powers, and various cooling-water flowrates. The results show that the optimal filling-ratio is about 40% of the volume of the vaporizing section of the heat pipe. Compared with a conventional short heat pipe, the extra-long heat pipe experiences significant thermal vibration. The oscillation frequency depends on the heating power and working-fluid filling ratio. With increasing cooling-water flow rate, the heat-transfer rate of the heat pipe increases before it reaches a plateau. In addition, we investigate the heat-transfer performance of the heat pipe for an extreme working-fluid filling ratio; the results indicate that the lower part of the heat pipe is filled with vapor, which reduces the heat-transfer to the top part. Based on the experimental data, guidelines for designing a heat pipe that can be really used for the exploitation of earth-deep geothermal energy are analyzed.Jiwen CenFeng LiTingliang LiWenbo HuangJuanwen ChenFangming JiangMDPI AGarticlesuper-long gravity heat pipegeothermal energy exploitationphase-change heat transfertwo phase flowlength-diameter ratioEnvironmental effects of industries and plantsTD194-195Renewable energy sourcesTJ807-830Environmental sciencesGE1-350ENSustainability, Vol 13, Iss 12481, p 12481 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	super-long gravity heat pipe geothermal energy exploitation phase-change heat transfer two phase flow length-diameter ratio Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350
spellingShingle	super-long gravity heat pipe geothermal energy exploitation phase-change heat transfer two phase flow length-diameter ratio Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350 Jiwen Cen Feng Li Tingliang Li Wenbo Huang Juanwen Chen Fangming Jiang Experimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation
description	The installation and operation of enhanced geothermal systems (EGS) involves many challenges. These challenges include the high cost and high risk associated with the investment capital, potential large working-fluid leakage, corrosion of equipment, and subsiding land. A super-long heat pipe can be used for geothermal exploitation to avoid these problems. In this paper, a high aspect-ratio heat pipe (30 m long, 17 mm in inner diameter) is installed vertically. Experiments are then carried out to study its heat-transfer performance and characteristics using several filling ratios of deionized water, different heating powers, and various cooling-water flowrates. The results show that the optimal filling-ratio is about 40% of the volume of the vaporizing section of the heat pipe. Compared with a conventional short heat pipe, the extra-long heat pipe experiences significant thermal vibration. The oscillation frequency depends on the heating power and working-fluid filling ratio. With increasing cooling-water flow rate, the heat-transfer rate of the heat pipe increases before it reaches a plateau. In addition, we investigate the heat-transfer performance of the heat pipe for an extreme working-fluid filling ratio; the results indicate that the lower part of the heat pipe is filled with vapor, which reduces the heat-transfer to the top part. Based on the experimental data, guidelines for designing a heat pipe that can be really used for the exploitation of earth-deep geothermal energy are analyzed.
format	article
author	Jiwen Cen Feng Li Tingliang Li Wenbo Huang Juanwen Chen Fangming Jiang
author_facet	Jiwen Cen Feng Li Tingliang Li Wenbo Huang Juanwen Chen Fangming Jiang
author_sort	Jiwen Cen
title	Experimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation
title_short	Experimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation
title_full	Experimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation
title_fullStr	Experimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation
title_full_unstemmed	Experimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation
title_sort	experimental study of the heat-transfer performance of an extra-long gravity-assisted heat pipe aiming at geothermal heat exploitation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/00ad1b38039445d1b051f62f3d2a938b
work_keys_str_mv	AT jiwencen experimentalstudyoftheheattransferperformanceofanextralonggravityassistedheatpipeaimingatgeothermalheatexploitation AT fengli experimentalstudyoftheheattransferperformanceofanextralonggravityassistedheatpipeaimingatgeothermalheatexploitation AT tingliangli experimentalstudyoftheheattransferperformanceofanextralonggravityassistedheatpipeaimingatgeothermalheatexploitation AT wenbohuang experimentalstudyoftheheattransferperformanceofanextralonggravityassistedheatpipeaimingatgeothermalheatexploitation AT juanwenchen experimentalstudyoftheheattransferperformanceofanextralonggravityassistedheatpipeaimingatgeothermalheatexploitation AT fangmingjiang experimentalstudyoftheheattransferperformanceofanextralonggravityassistedheatpipeaimingatgeothermalheatexploitation
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Experimental Study of the Heat-Transfer Performance of an Extra-Long Gravity-Assisted Heat Pipe Aiming at Geothermal Heat Exploitation

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