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Technical Brief

Use of Silicone Oil and Coconut Oil as Liquid Spectrum Filters for BSPVT: With Emphasis on Degradation of Liquids by Sunlight

[+] Author and Article Information
Sandeep S. Joshi

Department of Mechanical Engineering,
Visvesvaraya National Institute of Technology,
Nagpur, Maharashtra 440010, India
e-mail: sandeepshrijoshi@gmail.com

Ashwinkumar S. Dhoble

Department of Mechanical Engineering,
Visvesvaraya National Institute of Technology,
Nagpur, Maharashtra 440010, India
e-mail: ashwindhoble@rediffmail.com

Manuscript received June 16, 2017; final manuscript received September 2, 2017; published online October 17, 2017. Assoc. Editor: Gerardo Diaz.

J. Sol. Energy Eng 140(1), 014502 (Oct 17, 2017) (9 pages) Paper No: SOL-17-1236; doi: 10.1115/1.4038052 History: Received June 16, 2017; Revised September 02, 2017

The solar photovoltaic thermal system (PVT) facilitates conversion of incoming solar radiations into heat and electricity simultaneously. The beam split photovoltaic thermal system (BSPVT) is one of the PVT systems. In this system, the incoming solar beam is splitted and used separately for PV and thermal system. The feasibility of water, silicone oil, and coconut oil as spectrum filter for C–Si solar photovoltaic system is reported in the literature recently. However, the changes in the optical behavior of the liquids due to extended exposure to sunlight (aging effect) had not been considered in most of the previous studies. The current study includes the methodology for the selection of liquids for BSPVT systems, estimation of external quantum efficiency (EQE) of a solar cell using liquids, and the aging effect on the liquid spectrum filters. The spectral response of the solar cell is analyzed using BENTHAM, (PVE 300) for 300–1100 nm. In this study, it has been observed that the aging of silicone oil reduces the electrical performance of the solar cell. On the other hand, the aged coconut oil improves the electrical performance of the solar cell as compared to the fresh coconut oil spectrum filter.

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References

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Figures

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Fig. 1

Concept of BSPVT system [3]

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Fig. 2

Methodology for selection of liquid for BSPVT systems

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Fig. 3

Fresh and aged liquid samples

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Fig. 4

Absorption spectrum of water

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Fig. 5

Absorption spectrum of fresh and aged silicone oil

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Fig. 6

Absorption spectrum of fresh and aged coconut oil

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Fig. 7

Determination of spectral absorption by the liquids

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Fig. 8

EQE measurement system

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Fig. 9

EQE of the solar cell without any spectrum filter, empty spectrum filter, and silicone oil spectrum filters

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Fig. 10

EQE of the solar cell without any spectrum filter, empty spectrum filter, and water spectrum filter

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Fig. 11

EQE of the solar cell without any spectrum filter, empty spectrum filter, and coconut oil spectrum filters

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Fig. 12

PVT system with liquid spectrum filters

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