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Research Papers

Performance Comparison and Model Validation of a Conical Solar Reflector and a Linear Fresnel Concentrator

[+] Author and Article Information
M. Imtiaz Hussain

Department of Biosystems Engineering,
Kangwon National University,
Chuncheon 24341, South Korea
e-mail: imtiaz287@hotmail.com

Gwi Hyun Lee

Department of Biosystems Engineering,
Kangwon National University,
Chuncheon 24341, South Korea
e-mail: ghlee@kangwon.ac.kr

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received January 11, 2016; final manuscript received October 7, 2016; published online November 2, 2016. Assoc. Editor: Mary Jane Hale.

J. Sol. Energy Eng 138(6), 061014 (Nov 02, 2016) (10 pages) Paper No: SOL-16-1019; doi: 10.1115/1.4034958 History: Received January 11, 2016; Revised October 07, 2016

Comparative performance assessment and model validation of the linear Fresnel concentrator (LFC) and the conical solar reflector (CSR) systems were performed under identical operating and climatic conditions. This paper analyzes the amount of heat loss by convective heat transfer (natural or forced) from the receiver to ambient air with and without a glass-reinforced plastic sheet enclosure around the collector assembly. The matlab ordinary differential equation (ode) solvers were used for simulation of the transient states. Mathematical models were generated from energy balance equations of the glass cover, absorber pipe, heat transfer fluid, and storage tank for each system. Thermal and optical analyses of the LFC (with and without an enclosure) and CSR systems were carried out by using the measured and calculated results. Satisfactory agreement was found between the experimental data and predicted results. The given models are suitable to simulate the dynamic energy flow across the different components of the LFC and CSR systems.

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Figures

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Fig. 1

Schematic of heat transfer model of absorber assembly for both systems

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Fig. 2

(a) Experimental setup of CSR and (b) reflector and absorber assembly

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Fig. 3

Experimental setup of LFC

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Fig. 4

Schematic layout of CSR and LFC systems

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Fig. 5

Drawing with sizes: (a) CSR collector and (b) LFC collector

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Fig. 6

Daily variation of weather parameters (Nov. 13, 2014)

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Fig. 7

Comparison of predicted and measured temperatures for fluid in the tank

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Fig. 8

Comparison of measured and calculated tank fluid temperatures: (a) CSR and (b) LFC

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Fig. 9

Predicted temperatures of absorber pipe, fluid in pipe, and glass cover for both CSR and LFC systems

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Fig. 10

Actual useful energy collected by LFC system

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Fig. 11

Actual useful energy collected by CSR system

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Fig. 12

Variation of LFC and CSR system efficiencies in function of (Ti−Ta)/Ia parameter

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