Optical scatter measurement and analysis of innovative daylight scattering materials

Mohanty, Lipi; Yang, Xiaoming; Wittkopf, Stephen

doi:10.1016/j.solener.2011.10.027

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…DRCs such as the exemplary that exhibit a visible geometry and therefore non-uniformity require the adjustment of the sampling aperture [26,27]. It must be set large enough relative to the the scale of the sample that the averaged BSDF is representative for the entire sample.…”

Section: Measuring the Bsdf Of The Production Samplementioning

confidence: 99%

Accordance of Light Scattering from Design and De-Facto Variants of a Daylight Redirecting Component

Noback¹,

Grobe²,

Wittkopf³

2016

Buildings

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Abstract:For the systematic development of a small-scale daylight-redirecting louver system the impact of manufacturing on light scattering characteristics has to be quantified, localized and understood. In this research, the accordance of the measured scattering distributions of a de-facto production sample V1 with the computed predictions based on its design geometry V2 are quantified for selected incident light directions. A metric describing the global accordance of distributions is adapted to quantify their overall difference. A novel metric of local accordance allows further analysis. A particular low global accordance between V1 and V2 is found for an incident elevationTo test the hypothesis that this result can be explained by observed geometric deviations, a simulation model V3 replicating these is compared to the design. The hypothesis is supported by the resulting high degree of accordance. The low local accordance for individual outgoing light directions indicates geometric non-uniformity of the sample V1. This method has been found useful for product development and quality assurance. Beyond their application in the proposed method, global and local accordance have potential applications in all fields of light scattering measurements.

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Section: Measuring the Bsdf Of The Production Samplementioning

confidence: 99%

Accordance of Light Scattering from Design and De-Facto Variants of a Daylight Redirecting Component

Noback¹,

Grobe²,

Wittkopf³

2016

Buildings

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“…The system at the Solar Energy Research Institute of Singapore (SERIS) is a specialized instrument for the angularly resolved measurement of optical scatter in the reflection and trans-mission hemispheres and follows the standard practice of goniometry as defined in ASTM 2387-05 [7]. Reflectances are measured for both PV modules with planar and textured glass, for eight angles of incidence: 10 • , 20 • , 30 • , 40 • , 50 • , 60 • , 70 • , and 80 • .…”

Section: A Angular Lossmentioning

confidence: 99%

“…For F d , the integration is performed over the tilted PV module viewing area of the sky; for F a , the integration is performed over the ground viewing area; for F h , the integration is performed over the viewing area of the horizon band. By numerically solving (4), angular loss factors F d , F a , and F h as a function of the tilt angle of the PV modules with a planar and textured glass are obtained and approximated using (5)- (7). For the planar module, the equations are…”

Section: B Angular Loss Factormentioning

confidence: 99%

Comparison of Angular Reflectance Losses Between PV Modules With Planar and Textured Glass Under Singapore Outdoor Conditions

Khoo

Singh²,

Walsh³

et al. 2014

IEEE J. Photovoltaics

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Photovoltaic (PV) modules are rated under standard test conditions with normally incident light, whereas under outdoor conditions photons arrive on a PV module surface at all angles. In this study, the angular losses of PV modules with a planar and textured front glass are investigated for the tropical conditions of Singapore. Angular reflectance for both modules is first measured using a goniophotometer. From the measurements, the angular loss factors due to the different radiation components are calculated. Then, the angular losses under Singapore outdoor conditions are determined using three transposition models: Liu and Jordan, Hay and Davies, and Perez et al. Two 60-cell PV modules with a planar and textured glass are fabricated and measured outdoors for validation of the modeling results. Outdoor measurement results show that the PV module with textured glass captures 1.4% extra light compared with the PV module with planar glass for the 6-mo period studied. Next, the annual angular loss, monthly angular loss, and typical meteorological day angular loss for both module structures are studied. For all cases studied, the PV module with textured glass has consistently lower angular losses compared with the PV module with a planar glass.

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“…However, these modules have to meet the standard requirements for glass in buildings for luminous and solar characteristics of glazing according to EN 410 [6]. Studies describing these performance characteristics of PV glazing extended by the angle dependece properties can be found in [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Measurement and Calculation of Luminous Characteristics of Photovoltaic Glazing Samples

Šujanová¹,

Hraška²

2016

AMM

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Photovoltaic glazing is a relatively novel type of glazing material, suitable for application in nearly-zero energy buildings. As a special type of building integrated photovoltaic (BIPV), it generates energy from solar radiation and ensures the performance characteristics of building envelope. This paper presents a combined approach of evaluation of luminous characteristics of glazing based on photopic and circadian action spectra. Measurements were performed on 6 photovoltaic glazing samples with amorphous silicon solar cells. The samples differ in type of spacing and rear glazing colour. The results have shown that PV glazing with coloured glazing should be used with caution, especially in rooms with high daylighting requirements. Obtained results can be used during designing process to evaluate impact of PV glazing on visual comfort.

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Optical scatter measurement and analysis of innovative daylight scattering materials

Cited by 12 publications

References 7 publications

Accordance of Light Scattering from Design and De-Facto Variants of a Daylight Redirecting Component

Accordance of Light Scattering from Design and De-Facto Variants of a Daylight Redirecting Component

Comparison of Angular Reflectance Losses Between PV Modules With Planar and Textured Glass Under Singapore Outdoor Conditions

Measurement and Calculation of Luminous Characteristics of Photovoltaic Glazing Samples

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