author = "Herrero Martin, Rebeca"

Encontrado 22 documentos, página mostrada 1 de 3

Evaluation of misalignments within a concentrator photovoltaic module by the module optical analyzer: a case of study concerning temperature effects on the module performance

Description: Instituto de Energía Solar, Universidad Politécnica de Madrid (IES-UPM) has developed a method [referred to as the luminescence inverse (LI) method] and equipment [called module optical analyzer (MOA)] to fast measure the optical-angular properties of a CPV module without illumination system nor mod...
Language(s): Inglés

Assessment of the optical efficiency of a primary lens to be used in a CPV system

Description: This article summarizes experimental methods to evaluate the performance and to assess the efficiency of a lens that will be used as primary optics in a concentrating photovoltaic system comprising multijunction solar cells. The methods are classified into two groups: those intended to quantify the ...
Language(s): Inglés

Methodology of quantifying curvature of Fresnel lenses and its effect on CPV module performance

Description: Fresnel lenses used as primary optics in concentrating photovoltaic modules may show warping produced by lens manufacturing or module assembly (e.g., stress during molding or weight load) or due to stress during operation (e.g., mismatch of thermal expansion between different materials). To quantify...
Language(s): Inglés

Understanding causes and effects of non-uniform light distributions on multi-junction solar cells: Procedures for estimating efficiency losses

Description: This paper presents the mechanisms of efficiency losses that have to do with the non-uniformity of the irradiance over the multi-junction solar cells and different measurement techniques used to investigate them. To show the capabilities of the presented techniques, three different concentrators (th...
Language(s): Inglés

Hybrid dome with total internal reflector as a secondary optical element for CPV

Description: Secondary optical elements (SOEs) are used in Concentrator Photovoltaic (CPV) modules to allow the concentration ratio to exceed those typically achievable by Fresnel lenses, reducing cell costs, without sacrificing tolerance to tracking errors. One option is a “dome” SOE: a simple, single surface r...
Language(s): Inglés

Power rating based on two different spectroheliometers with lattice-matched (LM) and upright metamorphic (UMM) component solar cells

Description: Synthetic and empirical data have been used to explore the influence of spectral mismatch between MJ cell technologies on outdoor CPV module rating uncertainty. Calibration biases are attenuated by tightly filtering spectral conditions to a spectral matching ratio (SMR) of 1 ± 2.5%. The sensitivity ...
Language(s): Inglés

Measuring primary lens efficiency: A proposal for standardization

Description: This article describes the procedure proposed by IES-UPM to measure the optical efficiency and the irradiance of the focused spot of a primary optic for concentrator PV (CPV). The method using a broadband source (solar simulator) with a solar cell as the sensor and analysis of the focused spot recor...
Language(s): Inglés

Design and modeling of a cost-effective achromatic Fresnel lens for concentrating photovoltaics

Description: This paper presents a novel Fresnel lens capable to significantly reduce chromatic aberration in solar applications. The optical performance of this achromatic lens has been analyzed through ray-tracing simulations, showing a concentration factor three times higher than that attained by a classic Si...
Language(s): Inglés

A novel scanning lens instrument for evaluating Fresnel lens performance: equipment development and initial results

Description: A system dedicated to the optical transmittance characterization of Fresnel lenses has been developed at NREL, in collaboration with the UPM. The system quantifies the optical efficiency of the lens by generating a performance map. The shape of the focused spot may also be analyzed to understand c...
Language(s): Inglés

Thermal effects and other interesting issues with CPV lenses

Description: The Photovoltaic (PV) Module Reliability Workshop was held in Golden, Colorado, on Feb. 28?March 1, 2012. The objective was to share information to improve PV module reliability because such improvements reduce the cost of solar electricity and give investors confidence in the technology. NREL led t...
Language(s): Danés

Encontrado 22 documentos, página mostrada 1 de 3

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