Effects of the Aspect Ratio of a Rectangular Thermosyphon on Its Thermal Performance

Chia-Wang Yu, C. S. Huang, C. T. Tzeng and Chi-Ming Lai
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Chia-Wang Yu: Department of Architecture, National Cheng Kung University, Tainan 701, Taiwan
C. S. Huang: Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan
C. T. Tzeng: Department of Architecture, National Cheng Kung University, Tainan 701, Taiwan
Chi-Ming Lai: Department of Civil Engineering, National Cheng Kung University, Tainan 701, Taiwan

Energies, 2019, vol. 12, issue 20, 1-11

Abstract: The natural convection behaviors of rectangular thermosyphons with different aspect ratios were experimentally analyzed in this study. The experimental model consisted of a loop body, a heating section, a cooling section, and adiabatic sections. The heating and cooling sections were located in the vertical portions of the rectangular loop. The length of the vertical cooling section and the lengths of the upper and lower adiabatic sections were fixed at 300 mm and 200 mm, respectively. The inner diameter of the loop was fixed at 11 mm, and the cooling end temperature was 30 °C. The relevant parameters and their ranges were as follows: The aspect ratios were 6, 4.5, and 3.5 (with potential differences of 41, 27, and 18, respectively, between the cold and hot ends), and the input thermal power ranged from 30 to 60 W (with a heat flux of 600 to 3800 W/m 2 ). The results show that it is feasible to obtain solar heat gain by installing a rectangular thermosyphon inside the metal curtain wall and that increasing the height of the opaque part of the metal curtain wall can increase the aspect ratio of the rectangular thermosyphon installed inside the wall and thus improve the heat transfer efficiency.

Keywords: heat transfer; energy; thermosyphon; natural circulation loop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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