Towards 50years lifetime of PV panels laminated with silicone gel technology

Poulek, V.; Strebkov, D. S.; S.Persic, Irina; Libra, Martin

doi:10.1016/j.solener.2012.07.013

Cited by 69 publications

(39 citation statements)

References 3 publications

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“…The irradiation intensity is low in the wavelengths region of 900 nm ≤ λ ≤ 1,100 nm, but the sensitivity of PV cells is low in this range. The highest sensitivity of crystalline PV cells is in the wavelength region of 500 nm ≤ λ ≤ 900 nm (Poulek, Libra 2010) and such radiation is incident on the PV cell.…”

Section: Methodsmentioning

confidence: 99%

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Temperature changes of I-V characteristics of photovoltaic cells as a consequence of the Fermi energy level shift

Libra¹,

Poulek²,

Kouřím³

2017

Res. Agric. Eng.

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Photovoltaic (PV) energy conversion has grown in importance in the past decade. Number of large PV power plants with nominal power of the order of tens of MW p and a number of smaller PV systems on the roofs were installed (Poulek, Libra 2010). Most of them were installed in Europe, mainly in connection with the subsidy policies of some countries.It is known that changes in operation temperature cause changes of current and voltage of PV cells and PV modules (i.e. I-V characteristic). Increasing temperature decreases the open-circuit voltage. This effect simultaneously increases the short-circuit current (Orioli, Di Gangi 2013; Barukcic et al. 2014; Baig et al. 2015). The efficiency of the photovoltaic energy conversion thus decreases with the increasing temperature (Karatepe et al. 2007). In this paper, this phenomenon is theoretically explained by the theory of solid state physics (Pikus 1965;Snejdar, Frank 1976;Kittel 2005). Similar problems were discussed previously (Carrero et al. 2011;Liu et al. 2011;Ding et al. 2014) in case of common solar cells or by (Strebkov 2010) in case of matrix solar cells. The I-V and P-V characteristics of partially shaded PV system were also discussed (Kofinas et al. 2015). The increasing temperature causes a narrowing of the forbidden gap and a shift of the Fermi energy level toward the centre of the forbidden gap. Both these effects lead to a reduction of the potential barrier in the band diagram of the illuminated PN junction, and thus to a decrease of the photovoltaic voltage. In addition, narrowing of the forbidden gap causes higher generation of electron-hole pairs in the illuminated PN junction and short-circuit current increases.

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Section: Methodsmentioning

confidence: 99%

“…Number of large PV power plants with nominal power of the order of tens of MW p and a number of smaller PV systems on the roofs were installed (Poulek, Libra 2010). Most of them were installed in Europe, mainly in connection with the subsidy policies of some countries.…”

mentioning

confidence: 99%

Temperature changes of I-V characteristics of photovoltaic cells as a consequence of the Fermi energy level shift

Libra¹,

Poulek²,

Kouřím³

2017

Res. Agric. Eng.

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“…Silicone gel laminated PV panel with power reduction about 15% over 50 years service life is possible because of strongly reduced corrosiveness of solar cells in modules by silicone gel. Corrosiveness of solar cells is the main source of failures in EVA laminated PV panels . Typically, fixed (non adjustable) PV arrays should be tilted toward south by an angle equal to the latitude of the array's location to capture the most year round solar energy.…”

Section: Description Of Devices and Principle Of Operation Of Space Mmentioning

confidence: 99%

Experimental implementation of meteorological data and photovoltaic solar radiation monitoring system

Rezk

Tyukhov

Raupov

2015

Int. Trans. Electr. Energ. Syst.

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Summary The main objective of this paper is to describe activity associated with high technologies of real‐time monitoring of the Earth surface and solar energy conversion. A data acquisition system has designed and implemented with facilities for monitoring meteorological data and solar radiation. The system, using photovoltaic monitoring equipment and hardware–software complex “Kosmos–3M”, was developed for taking images of the Earth from National Oceanic and Atmospheric Administration (NOAA) satellites and for handling these images, analyzing many important geographical and meteorological parameters for forecasting of incoming solar radiation. With the help of the proposed monitoring system it is possible to study not only weather but also climatic aspects using solar energy in case of long‐term collecting data at least during 10–30 years. Copyright © 2015 John Wiley & Sons, Ltd.

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“…All systems use simple low cost polar axis tracking system Traxle (Poulek and Libra, 1998). Flat plate glass/-glass bifacial PV panels for pseudo parabolic concentrator systems were encapsulated by the silicone gel technology (Poulek et al, 2012) The new encapsulation method using soft polysiloxane gel differs substantially from the preceding solid polysiloxane encapsulation (Ketola et al, 2008). Although the EVA encapsulant was replaced by the polysiloxane gel, the general design of PV panels is identical to standard ones.…”

Section: Introductionmentioning

confidence: 99%