Search results for "Maximum error"

showing 3 items of 3 documents

One diode circuital model of light soaking phenomena in Dye-Sensitized Solar Cells

2018

Abstract In this work, we report on the modelling of light soaking effect on Ruthenium-based Dye Sensitized Solar cells (DSSCs). Such a phenomenon can be detected when exposing the cells at increasing hours of illumination and produces a reversible performance increase. Starting from the results obtained through the electro-optical characterization of the cells, we applied a one-diode circuital-model. Our results show a good agreement between the experimental and the simulated data, with a mean square error in the order of 10−12 and a maximum error in current lower than 0.6%. Finally such results allowed us to infer some precise trends followed by the cells main electrical parameters and of…

Dye sensitized solar cells (DSSCs)Materials scienceAtomic and Molecular Physics and OpticElectrical modelchemistry.chemical_element02 engineering and technologyElectro-optical characterization010402 general chemistry01 natural sciencesMaximum errorSettore ING-INF/01 - ElettronicaPhotovoltaicsParameters estimationElectrical and Electronic EngineeringDiodebusiness.industryElectronic Optical and Magnetic MaterialLight soaking021001 nanoscience & nanotechnologyAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic MaterialsRutheniumDye-sensitized solar cellchemistrySimulated dataOptoelectronics0210 nano-technologybusinessOne-diode modelPhotovoltaic
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On the numerical solution of the distributed parameter identification problem

1991

A new error estimate is derived for the numerical identification of a distributed parameter a(x) in a two point boundary value problem, for the case that the finite element method and the fit-to-data output-least-squares technique are used for the identifications. With a special weighted norm, we get a pointwise estimate. Prom the error estimate and also from the numerical tests, we find that if we decrease the mesh size, the maximum error between the identified parameter and the true parameter will increase. In order to improve the accuracy, higher order finite element spaces should be used in the approximations.

PointwiseParameter identification problemPoint boundaryNorm (mathematics)Applied mathematicsNumerical testsInverse problemMaximum errorFinite element methodMathematics
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A very simple model for computing global solar radiation

1990

Abstract In this paper a very simple model for predicting the daily global solar radiation at any Italian location using as input of a few extensively measured meterological parameters is proposed. In fact the daily radiation G (MJ m−2) is here correlated only with the sunshine duration s (h) and the noon altitude of the sun on the 15th of the month h n (degrees) by the following equation: G= Ks 0.5 (sin h n ) 1.15 where only one value of the factor K is used. The validity of this formula is verified fixing K = 7.8 and using the data from 34 Italian stations displaced at various latitudes, altitudes or geographical situations (inland or coastal site). The test results show that the deviatio…

SIMPLE (dark matter experiment)Global solar radiationAltitudeMeteorologySunshine durationGeneral EngineeringMicroclimateNoonMaximum errorMathematicsLatitudeSolar & Wind Technology
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