Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio

Thermosyphon based evacuated tube solar collectors have seen exponential growth in the last few decades for domestic hot water applications. The output temperatures of such collectors can be increased by integrating evacuated tube receivers with compound parabolic concentrators (CPCs) to meet many i...

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Main Authors: Akhter, J., Gilani, S.I., Al-Kayiem, H.H., Ali, M.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.23771 /
Published: Taylor and Francis Ltd. 2021
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087354116&doi=10.1080%2f01457632.2020.1777004&partnerID=40&md5=05479e67587240484a025e7c789ab723
http://eprints.utp.edu.my/23771/
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spelling utp-eprints.237712021-08-19T13:10:41Z Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio Akhter, J. Gilani, S.I. Al-Kayiem, H.H. Ali, M. Thermosyphon based evacuated tube solar collectors have seen exponential growth in the last few decades for domestic hot water applications. The output temperatures of such collectors can be increased by integrating evacuated tube receivers with compound parabolic concentrators (CPCs) to meet many industrial heat loads. This paper presents a new concept of increasing concentration of solar radiation along the length of an evacuated tube receiver coupled with a modified CPC with 52.5° and 38.5° acceptance half-angles at the inlet and outlet sides respectively. The effect of varying concentration ratio in the longitudinal direction is analyzed in terms of increasing heat flux and temperature gradient between the inlet and outlet of the receiver. Monte Carlo ray-tracing analysis confirmed a gradual increase of power density along the length of the receiver paired with the modified CPC. The daily average energy collection by the modified CPC was comparable with that of equal aperture area CPC with a fixed concentration ratio along its length. The experimental results demonstrated about a 15 higher temperature gradient in the case of CPC with a varying concentration ratio as compared to equal aperture area CPC with a fixed concentration ratio single-phase thermosyphon flow. © 2020 Taylor & Francis Group, LLC. Taylor and Francis Ltd. 2021 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087354116&doi=10.1080%2f01457632.2020.1777004&partnerID=40&md5=05479e67587240484a025e7c789ab723 Akhter, J. and Gilani, S.I. and Al-Kayiem, H.H. and Ali, M. (2021) Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio. Heat Transfer Engineering, 42 (13-14). pp. 1117-1131. http://eprints.utp.edu.my/23771/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description Thermosyphon based evacuated tube solar collectors have seen exponential growth in the last few decades for domestic hot water applications. The output temperatures of such collectors can be increased by integrating evacuated tube receivers with compound parabolic concentrators (CPCs) to meet many industrial heat loads. This paper presents a new concept of increasing concentration of solar radiation along the length of an evacuated tube receiver coupled with a modified CPC with 52.5° and 38.5° acceptance half-angles at the inlet and outlet sides respectively. The effect of varying concentration ratio in the longitudinal direction is analyzed in terms of increasing heat flux and temperature gradient between the inlet and outlet of the receiver. Monte Carlo ray-tracing analysis confirmed a gradual increase of power density along the length of the receiver paired with the modified CPC. The daily average energy collection by the modified CPC was comparable with that of equal aperture area CPC with a fixed concentration ratio along its length. The experimental results demonstrated about a 15 higher temperature gradient in the case of CPC with a varying concentration ratio as compared to equal aperture area CPC with a fixed concentration ratio single-phase thermosyphon flow. © 2020 Taylor & Francis Group, LLC.
format Article
author Akhter, J.
Gilani, S.I.
Al-Kayiem, H.H.
Ali, M.
spellingShingle Akhter, J.
Gilani, S.I.
Al-Kayiem, H.H.
Ali, M.
Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio
author_sort Akhter, J.
title Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio
title_short Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio
title_full Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio
title_fullStr Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio
title_full_unstemmed Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio
title_sort performance evaluation of a modified compound parabolic concentrating collector with varying concentration ratio
publisher Taylor and Francis Ltd.
publishDate 2021
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087354116&doi=10.1080%2f01457632.2020.1777004&partnerID=40&md5=05479e67587240484a025e7c789ab723
http://eprints.utp.edu.my/23771/
_version_ 1741196729612500992
score 11.62408

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