module performance
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Author(s):  
zhang caixia ◽  
Honglie Shen ◽  
Jun Chen ◽  
Hua LI

Abstract Partial shading is very common in photovoltaic (PV) systems. The mismatch losses and hot-spot effects caused by partial shading can not only affect the output power of a solar system, but also can bring security and reliability problems. This paper centers on the silicon crystalline PV module technology subjected to operating conditions with some cells partially or fully shaded. A comparison of the electrical and hot-pot performance results for four different connection mode PV modules without shading and with partial or full shading is presented. Bypass diode of different modules would start up in the different conditions with increasing shading area. We found that the regular half-cell module degraded about 60% than its non-shaded power, which is about 30% less than the other three modules, when the short edges of these modules were shaded. The highest hot-spot temperature of the regular half-cell module was 75.5C, which is the lowest among the four modules before diode started up.


2021 ◽  
Author(s):  
Issa Faye ◽  
Ababacar Ndiaye ◽  
Elkhadji Mamadou

The variation of the incidence angle over the year is an important parameter determined the performance of the module. The standard orientation of the module or a PV system, the perpendicular positioning of the sun to the module’s surface occurs twice a year. In outdoor exposed, angular losses of the module decrease the output of the PV or the system of PV. Although these losses are not always negligible, they are commonly not taken into account when correcting the electrical characteristics of the PV module or estimating the energy production of PV systems. This chapter is focused on the measurement of the angular response and spectral radiation (global and direct radiation) of solar cells based on two different silicon technologies, monocrystalline textured (m-Si) and non textured (mc-Si). The analysis of the source of deviation from the theoretical response, especially those due to the surface reflectance. As main contributions, the effects of glass encapsulation on the angular response of the modules are investigated by comparing the electrical parameter of the textured module to no textured and quantify electrical angular losses in this measurement area.


2021 ◽  
Vol 6 ◽  
Author(s):  
Dirk Tempelaar ◽  
Bart Rienties ◽  
Quan Nguyen

An important goal of learning analytics (LA) is to improve learning by providing students with meaningful feedback. Feedback is often generated by prediction models of student success using data about students and their learning processes based on digital traces of learning activities. However, early in the learning process, when feedback is most fruitful, trace-data-based prediction models often have limited information about the initial ability of students, making it difficult to produce accurate prediction and personalized feedback to individual students. Furthermore, feedback generated from trace data without appropriate consideration of learners’ dispositions might hamper effective interventions. By providing an example of the role of learning dispositions in an LA application directed at predictive modeling in an introductory mathematics and statistics module, we make a plea for applying dispositional learning analytics (DLA) to make LA precise and actionable. DLA combines learning data with learners’ disposition data measured through for example self-report surveys. The advantage of DLA is twofold: first, to improve the accuracy of early predictions; and second, to link LA predictions with meaningful learning interventions that focus on addressing less developed learning dispositions. Dispositions in our DLA example include students’ mindsets, operationalized as entity and incremental theories of intelligence, and corresponding effort beliefs. These dispositions were inputs for a cluster analysis generating different learning profiles. These profiles were compared for other dispositions and module performance. The finding of profile differences suggests that the inclusion of disposition data and mindset data, in particular, adds predictive power to LA applications.


2021 ◽  
Vol 1973 (1) ◽  
pp. 012020
Author(s):  
Sarah Yahya Hattam ◽  
Mahdi Hatf Kadhum Aboaltabooq ◽  
Hazim A. Al-Zurfi

2021 ◽  
Author(s):  
Robert Krysko ◽  
Umar Alqsair ◽  
Abdulaziz Alasiri ◽  
Sertac Cosman ◽  
Alparslan Oztekin

2021 ◽  
Author(s):  
Takeshi Tayagaki ◽  
Haruya Shimura ◽  
Ayumi Sasaki ◽  
Masahiro Yoshita

Photovoltaic modules (PVM) output power is sensitive to fluctuations in temperature and the concentration of solar insolation during sustained disclosure. The 20% of solar insolation will be converted into useful electrical energy, while the rest will be dissipated in the form of heat, which in rotate will increase the operating heat of the PVM and it negatively affects the open circuit voltage (Voc), resulting in a decrease in the power alteration productivity and an irreversible rate of cell deprivation. Appropriate cooling techniques are therefore crucial to preserve the operating temperature of the module under standard test conditions (STC). There are two different methods for cooling PVMs, namely active and passive these methods are subdivided into different techniques which are discussed one by one in literature review; in this paper the techniques for cooling PVMs are comprehensively reviewed


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