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Research Papers

Investigations of Different Liquid Based Spectrum Beam Splitters for Combined Solar Photovoltaic Thermal Systems

[+] Author and Article Information
S. S. Joshi

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

A. S. Dhoble

Assistant Professor
Department of Mechanical Engineering,
Visvesvaraya National Institute of Technology,
Nagpur 440010, India
e-mail: asdhoble71@gmail.com

P. R. Jiwanapurkar

Research Scholar
Department of Mechanical Engineering,
Shri Ramdeobaba College of
Engineering and Management,
Nagpur 440013, India
e-mail: p.jiwanapurkar@gmail.com

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 August 19, 2015; final manuscript received November 30, 2015; published online January 13, 2016. Assoc. Editor: Dr. Akiba Segal.

J. Sol. Energy Eng 138(2), 021003 (Jan 13, 2016) (7 pages) Paper No: SOL-15-1267; doi: 10.1115/1.4032352 History: Received August 19, 2015; Revised November 30, 2015

In the spectrum beam split approach of combined solar photovoltaic thermal system (PVT), the complete solar spectrum is splitted. The unwanted part of the solar spectrum for photovoltaic (PV) applications is filtered out and is used separately as heat. In this work, some inexpensive, clear, and easily available selective fluids are identified which can be used as both volumetric heat absorbers and selective spectrum filters for C-Si-based PVT. The electrical performance of a C-Si solar PV cell using these fluid-based filters is analyzed using a solar simulator at 1 Sun, AM 1.5 G. To check the volumetric heat absorbing potential, the required thermophysical properties of these selected fluids are estimated using a solar radiation pyranometer and standard experiments. The study concludes that water, coconut oil, and hydrotreated silicone transformer oil are some of the potential beam splitters and heat absorbers suitable for C-Si based spectrum beam split PVT applications.

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References

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Figures

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Fig. 1

Concept of beam split approach of PVT

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Fig. 2

Concept of ideal spectrum filter for C-Si solar cell

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Fig. 3

(a) Attenuation of solar radiations through an empty filter and (b) Attenuation of solar radiations through different fluids

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Fig. 4

Schematic diagram showing the arrangement of fluid feasibility test

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Fig. 5

Actual photographs showing the arrangement of fluid feasibility test

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Fig. 6

Actual photographs showing selected fluids as optical filters

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Fig. 7

(a) Isc of the solar cell for various fluid filters (filter fluid is at 30 °C) and (b) Isc of the solar cell for various fluid filters (filter fluid is at 80 °C)

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Fig. 8

(a) Voc of the solar cell for various fluid filters (filter fluid is at 30 °C) and (b) Voc of the solar cell for various fluid filters (filter fluid is at 80 °C)

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Fig. 9

(a) Pmax of the solar cell for various fluid filters (filter fluid is at 30 °C) and (b) Pmax of the solar cell for various fluid filters (filter fluid is at 80 °C)

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Fig. 10

(a) Efficiency of the solar cell for various fluid filters (filter fluid is at 30 °C) and (b) Efficiency of the solar cell for various fluid filters (filter fluid is at 80 °C)

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Fig. 11

(a) I–V curves of solar cell using different fluid filters when fluids in filters are at room temperature (filter fluid is at 30 °C) and (b) I–V curves of solar cell using different fluid filters when fluids in filters are at room temperature (filter fluid is at 80 °C)

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