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

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.

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

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.

Item Type:Article
Impact Factor:cited By 0
Uncontrolled Keywords:Capillary flow; Siphons; Thermal gradients; Thermosyphons, Acceptance half angle; Compound parabolic concentrator; Concentrating collector; Concentration ratio; Evacuated tube solar collector; Exponential growth; Longitudinal direction; Monte-Carlo ray tracing, Heat flux
ID Code:23771
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:19 Aug 2021 13:10
Last Modified:19 Aug 2021 13:10

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