Skip to main content

Research Repository

Advanced Search

Analytical investigation of the heat-transfer limits of a novel solar loop-heat pipe employing a mini-channel evaporator

Diallo, Thierno M.O.; Yu, Min; Zhou, Jinzhi; Zhao, Xudong; Ji, Jie; Hardy, David


Thierno M.O. Diallo

Min Yu

Jinzhi Zhou

Jie Ji

David Hardy


© 2018 by the authors. This paper presents an analytical investigation of heat-transfer limits of a novel solar loop-heat pipe developed for space heating and domestic hot water use. In the loop-heat pipe, the condensate liquid returns to the evaporator via small specially designed holes, using a mini-channel evaporator. The study considered the commonly known heat-transfer limits of loop-heat pipes, namely, the viscous, sonic, entrainment, boiling and heat-transfer limits due to the two-phase pressure drop in the loop. The analysis considered the main factors that affect the limits in the mini-channel evaporator: the operating temperature, mini-channel aspect ratio, evaporator length, evaporator inclination angle, evaporator-to-condenser height difference and the dimension of the holes. It was found that the entrainment is the main governing limit of the system operation. With the specified loop design and operational conditions, the solar loop-heat pipe can achieve a heat-transport capacity of 725 W. The analytical model presented in this study can be used to optimise the heat-transfer capacity of the novel solar loop-heat pipe.


Diallo, T. M., Yu, M., Zhou, J., Zhao, X., Ji, J., & Hardy, D. (2018). Analytical investigation of the heat-transfer limits of a novel solar loop-heat pipe employing a mini-channel evaporator. Energies, 11(1),

Journal Article Type Article
Acceptance Date Jan 4, 2018
Online Publication Date Jan 8, 2018
Publication Date Jan 8, 2018
Deposit Date Apr 2, 2019
Publicly Available Date Apr 3, 2019
Journal Energies
Print ISSN 1996-1073
Electronic ISSN 1996-1073
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 11
Issue 1
Article Number 148
Keywords Solar loop-heat pipe; Mini-channel evaporator; Solar collector; Heat transfer; Limit
Public URL
Publisher URL


Article (3.9 Mb)

Publisher Licence URL

Copyright Statement
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

You might also like

Downloadable Citations