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Research Papers

Correlation Between Transmittance and LWIR Apparent Emissivity of Soda-Lime Glass During Accelerated Aging Test for Solar Applications

[+] Author and Article Information
Vincent Guiheneuf

IUT de Sénart-Fontainebleau,
CERTES (EA 3481),
University of Paris-Est,
36 rue Georges Charpak,
Lieusaint 77567, France
e-mail: vincent.guiheneuf@u-pec.fr

Olivier Riou

IUT de Sénart-Fontainebleau,
CERTES (EA 3481),
University of Paris-Est,
36 rue Georges Charpak,
Lieusaint 77567, France
e-mail: olivier.riou@u-pec.fr

Fabien Delaleux

IUT de Sénart-Fontainebleau,
CERTES (EA 3481),
University of Paris-Est,
36 rue Georges Charpak,
Lieusaint 77567, France
e-mail: fabien.delaleux@u-pec.fr

Pierre-Olivier Logerais

IUT de Sénart-Fontainebleau,
CERTES (EA 3481),
University of Paris-Est,
36 rue Georges Charpak,
Lieusaint 77567, France
e-mail: pierre-olivier.logerais@u-pec.fr

Jean-Félix Durastanti

IUT de Sénart-Fontainebleau,
CERTES (EA 3481),
University of Paris-Est,
36 rue Georges Charpak,
Lieusaint 77567, France
e-mail: durastanti@u-pec.fr

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 December 20, 2016; final manuscript received March 17, 2017; published online May 16, 2017. Assoc. Editor: Marc Röger.

J. Sol. Energy Eng 139(4), 041006 (May 16, 2017) (6 pages) Paper No: SOL-16-1518; doi: 10.1115/1.4036415 History: Received December 20, 2016; Revised March 17, 2017

In solar power plants, both in photovoltaic (PV) and concentrated ones, the electrical output is a key parameter for the development of solar energy. To ensure relevant predictability of electrical output, the durability of photovoltaic panels or concentrating systems has to be warranted. The assessment of the optical performance durability of the front glass throughout the lifetime of the solar power plant involves using a nondestructive method in the field without disrupting the energy generation of such systems. The aim of this work is to experiment a new accurate nondestructive method to evaluate the aging impact of glass used in solar energy conversion systems. The results bring out a correlation between the apparent emissivity, used as an aging indicator, in a spectral bandwidth of 8–12 μm and the integrated transmittance in the visible range, i.e., 400–800 nm for a float glass of 2 mm thickness aged under damp heat (DH). The optical characterizations of the soda-lime glass exposed to the DH test highlight the relevance of apparent emissivity used like a nondestructive aging indicator. The sensitivity coefficient of apparent emissivity, which is defined as the ratio of partial derivative of integrated transmittance (δT) to the partial derivative of apparent emissivity (δε), reaches 3.83, meaning that the apparent emissivity is three times more sensitive than the integrated transmittance for the case study.

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References

Figures

Grahic Jump Location
Fig. 1

Thermacam E300 normal LWIR apparent emissivity εΔλ of glass as a function of the emitting temperature for different exposure times under damp heat conditions (85 °C/85% RH)

Grahic Jump Location
Fig. 2

Normalized gap of apparent emissivity for emitting temperature of 68 °C and 98 °C as a function of exposure time under damp heat conditions (85 °C/85% RH). Error bars represent standard deviation.

Grahic Jump Location
Fig. 3

Spectral transmittance T(λ) and spectral reflectance R(λ) of glass samples before and after 1000 h of damp heat exposure (Reproduced with permission from Guiheneuf et al. [21]. Copyright 2016 by Corrosion Engineering Science and Technology.)

Grahic Jump Location
Fig. 4

Normalized gap of integrated transmittance δTΔλ within 290–400 nm (○) and 400–800 nm (▴) as a function of exposure on time under damp heat conditions. Error bars represent standard deviation. (Reproduced with permission from Guiheneuf et al. [21]. Copyright 2016 by Corrosion Engineering Science and Technology.)

Grahic Jump Location
Fig. 5

Integrated transmittance TΔλ in the range Δλ = 400–800 nm as a function of normal LWIR apparent emissivity for different emitting temperatures: 68 °C, 78 °C, 98 °C, and 108 °C. Error bars represent standard deviation.

Grahic Jump Location
Fig. 6

Integrated transmittance TΔλ in (a) the range Δλ = 400– 800 nm and (b) the range Δλ = 290–400 nm as a function of normal LWIR apparent emissivity for an emitting temperature of 98 °C. Error bars represent standard deviation.

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