Next Article in Journal
Impacts of Bioenergy Policies on Land-Use Change in Nigeria
Next Article in Special Issue
Energy-Saving Analysis of Solar Heating System with PCM Storage Tank
Previous Article in Journal
Analysis of Combined Cycle Power Plants with Chemical Looping Reforming of Natural Gas and Pre-Combustion CO2 Capture
Previous Article in Special Issue
Phase Change Materials in Transparent Building Envelopes: A Strengths, Weakness, Opportunities and Threats (SWOT) Analysis
Open AccessArticle

Analytical Investigation of the Heat-Transfer Limits of a Novel Solar Loop-Heat Pipe Employing a Mini-Channel Evaporator

1
School of Engineering, University of Hull, Hull HU6 7RX, UK
2
Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China
*
Authors to whom correspondence should be addressed.
Energies 2018, 11(1), 148; https://doi.org/10.3390/en11010148
Received: 21 November 2017 / Revised: 2 January 2018 / Accepted: 4 January 2018 / Published: 8 January 2018
(This article belongs to the Special Issue Solar Technologies for Buildings)
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. View Full-Text
Keywords: solar loop-heat pipe; mini-channel evaporator; solar collector; heat transfer; limit solar loop-heat pipe; mini-channel evaporator; solar collector; heat transfer; limit
Show Figures

Figure 1

MDPI and ACS Style

Diallo, T.M.O.; Yu, M.; Zhou, J.; Zhao, X.; Ji, J.; Hardy, D. Analytical Investigation of the Heat-Transfer Limits of a Novel Solar Loop-Heat Pipe Employing a Mini-Channel Evaporator. Energies 2018, 11, 148.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop