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Volume 11
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10.3390/app11094100
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Article

Modification of a Solar Thermal Collector to Promote Heat Transfer inside an Evacuated Tube Solar Thermal Absorber

by
Rasa Supankanok
1,
Sukanpirom Sriwong
1,
Phisan Ponpo
1,
Wei Wu
2,
Walairat Chandra-ambhorn
1,* and
Amata Anantpinijwatna
1
1
Department of Chemical Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
2
Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
*
Author to whom correspondence should be addressed.
Appl. Sci. 2021, 11(9), 4100; https://doi.org/10.3390/app11094100
Submission received: 7 April 2021 / Revised: 24 April 2021 / Accepted: 25 April 2021 / Published: 30 April 2021
(This article belongs to the Special Issue Intelligent Innovation in Engineering, Applied Sciences and Technology)
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Abstract

Evacuated-tube solar collector (ETSC) is developed to achieve high heating medium temperature. Heat transfer fluid contained inside a copper heat pipe directly affects the heating medium temperature. A 10 mol% of ethylene-glycol in water is the heat transfer fluid in this system. The purpose of this study is to modify inner structure of the evacuated tube for promoting heat transfer through aluminum fin to the copper heat pipe by inserting stainless-steel scrubbers in the evacuated tube to increase heat conduction surface area. The experiment is set up to measure the temperature of heat transfer fluid at a heat pipe tip which is a heat exchange area between heat transfer fluid and heating medium. The vapor/ liquid equilibrium (VLE) theory is applied to investigate phase change behavior of the heat transfer fluid. Mathematical model validated with 6 experimental results is set up to investigate the performance of ETSC system and evaluate the feasibility of applying the modified ETSC in small-scale industries. The results indicate that the average temperature of heat transfer fluid in a modified tube increased to 160.32 °C which is higher than a standard tube by approximately 22 °C leading to the increase in its efficiency by 34.96%.
Keywords: evacuated tube; heat pipe tip; heat transfer fluid; stainless-steel scrubber evacuated tube; heat pipe tip; heat transfer fluid; stainless-steel scrubber

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MDPI and ACS Style

Supankanok, R.; Sriwong, S.; Ponpo, P.; Wu, W.; Chandra-ambhorn, W.; Anantpinijwatna, A. Modification of a Solar Thermal Collector to Promote Heat Transfer inside an Evacuated Tube Solar Thermal Absorber. Appl. Sci. 2021, 11, 4100. https://doi.org/10.3390/app11094100

AMA Style

Supankanok R, Sriwong S, Ponpo P, Wu W, Chandra-ambhorn W, Anantpinijwatna A. Modification of a Solar Thermal Collector to Promote Heat Transfer inside an Evacuated Tube Solar Thermal Absorber. Applied Sciences. 2021; 11(9):4100. https://doi.org/10.3390/app11094100

Chicago/Turabian Style

Supankanok, Rasa, Sukanpirom Sriwong, Phisan Ponpo, Wei Wu, Walairat Chandra-ambhorn, and Amata Anantpinijwatna. 2021. "Modification of a Solar Thermal Collector to Promote Heat Transfer inside an Evacuated Tube Solar Thermal Absorber" Applied Sciences 11, no. 9: 4100. https://doi.org/10.3390/app11094100

APA Style

Supankanok, R., Sriwong, S., Ponpo, P., Wu, W., Chandra-ambhorn, W., & Anantpinijwatna, A. (2021). Modification of a Solar Thermal Collector to Promote Heat Transfer inside an Evacuated Tube Solar Thermal Absorber. Applied Sciences, 11(9), 4100. https://doi.org/10.3390/app11094100

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