scholarly journals Assessment of the Operating Temperature of Crystalline PV Modules Based on Real Use Conditions

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Giuseppina Ciulla ◽  
Valerio Lo Brano ◽  
Vincenzo Franzitta ◽  
Marco Trapanese
Keyword(s):  
Operating Temperature ◽  
Maximum Power ◽  
Electricity Production ◽  
Electrical Behaviour ◽  
Weather Variables ◽  
Actual Performance ◽  
Photovoltaic Panels ◽  
New Correlation ◽  
Pv Modules

Determining the operating temperatureTcof photovoltaic panelsPVis important in evaluating the actual performance of these systems. In the literature, different correlations exist, in either explicit or implicit forms, which often do not account for the electrical behaviour of panels; in this way, estimatingTcis based only on the passive behaviour of thePV. In this paper, the authors propose a new implicit correlation that takes into account the standard weather variables and the electricity production regimes of aPVpanel in terms of the proximity to the maximum power points. To validate its reliability, the new correlation was tested on two different PV panels (Sanyo and Kyocera panels) and the results were compared with values obtained from other common correlations already available in the literature. The data show that the quality of the new correlation drastically improves the estimation of the photovoltaic operating temperature.

Performansi aktual modul photovoltaik dengan pengarah matahari

2018 ◽  
Vol 12 (2) ◽  
pp. 98 ◽  
Author(s):  
Jalaluddin . ◽  
Baharuddin Mire
Keyword(s):  
Solar Radiation ◽  
Local Time ◽  
Performance Characteristic ◽  
Electrical Energy ◽  
Photovoltaic Module ◽  
Experiment Data ◽  
Actual Performance ◽  
Pv Module ◽  
Solar Tracking ◽  
Pv Modules

Actual performance of photovoltaic module with solar tracking is presented. Solar radiation can be converted into electrical energy using photovoltaic (PV) modules. Performance of polycristalline silicon PV modules with and without solar tracking are investigated experimentally. The PV module with dimension 698 x 518 x 25 mm has maximum power and voltage is 45 Watt and 18 Volt respectively. Based on the experiment data, it is concluded that the performance of PV module with solar tracking increases in the morning and afternoon compared with that of fixed PV module. It increases about 18 % in the morning from 10:00 to 12:00 and in the afternoon from 13:30 to 14:00 (local time). This study also shows the daily performance characteristic of the two PV modules. Using PV module with solar tracking provides a better performance than fixed PV module. 

Explicit model of photovoltaic panels to determine voltages and currents at the maximum power point

Solar Energy ◽  
2011 ◽  
Vol 85 (5) ◽  
pp. 713-722 ◽  
Author(s):  
Etienne Saloux ◽  
Alberto Teyssedou ◽  
Mikhaïl Sorin
Keyword(s):  
Maximum Power ◽  
Explicit Model ◽  
Maximum Power Point ◽  
Photovoltaic Panels ◽  
Power Point

scholarly journals A New MPPT Control for Photovoltaic Panels by Instantaneous Maximum Power Point Tracking

2004 ◽  
Vol 124 (12) ◽  
pp. 1182-1188 ◽  
Author(s):  
Daiki Tokushima ◽  
Masato Uchida ◽  
Satoshi Kanbei ◽  
Hiroki Ishikawa ◽  
Haruo Naitoh
Keyword(s):  
Maximum Power Point Tracking ◽  
Maximum Power ◽  
Maximum Power Point ◽  
Photovoltaic Panels ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point

scholarly journals Compliance with materiality in G4-sustainability reports by electric utilities

2019 ◽  
Vol 14 (3) ◽  
pp. 583-608 ◽  
Author(s):  
Johannes Slacik ◽  
Dorothea Greiling
Keyword(s):  
Content Analysis ◽  
Information Needs ◽  
Electric Utility ◽  
Global Reporting Initiative ◽  
Actual Performance ◽  
Content Type ◽  
Reporting Practices ◽  
Reporting Practice ◽  
Sustainability Reports

Purpose Materiality as an emerging trend aims to make sustainability reports (SR) more relevant for stakeholders. This paper aims to investigate whether the reporting practice of electric utility companies (EUC) is in compliance with the materiality principle of the Global Reporting Initiative (GRI) when disclosing SR. Design/methodology/approach A twofold content analysis focusing on material aspects (MAs) is conducted, followed by correlation analysis. Logic and conversation theory (LCT) serves to evaluate the communication quality of documented materiality in SR by EUC. Findings The coverage and quality of documented MAs in SR by EUC do not meet the requirements for relevant and transparent communication. Materiality does not guide the reporting practice and is not taken seriously. Research limitations/implications Mediocre quality of coverage and communication in SR shows that stakeholders’ information needs are not considered adequately. The content analysis is limited in focusing on merely documented aspects rather than on actual performance. Originality/value This study considers the quality of communication of documented materiality through the lens of LCT. It contributes to the academic debate by introducing LCT as a viable theoretical perspective for analyzing SR. The paper evaluates GRI-G4 reporting practices in the electricity sector, which, while under-researched is crucial for sustainability. It also contributes to the emerging body of empirical research on the relevance of materiality as a guiding principle for sustainability reporting.

Analiza kapaciteta i uslova izgradnje fotonaponskih sistema na krovovima školskih objekata u Srbiji

2020 ◽  
Vol 22 (1-2) ◽  
pp. 21-28
Author(s):  
Iva Batić ◽  
◽  
Željko Đurišić
Keyword(s):  
Electricity Consumption ◽  
Plant Production ◽  
Electricity Production ◽  
School Buildings ◽  
Photovoltaic Systems ◽  
Photovoltaic Panels ◽  
Passive Construction ◽  
Production And Consumption ◽  
Roof Area ◽  
Installed Capacity

School and school gym buildings represent a relevant potential for construction of photovoltaic panels, to be integrated into roofs of these buildings. Given that roof structures are passive, construction of photovoltaic systems does not interfere with the building functionality, does not it in any way adversely affect the environment. Installation of photovoltaic systems on building roofs brings the production and consumption of electricity closest possible, therefore such systems ensure significant reduction in power losses in transmission and distribution grids. In addition to locally produced electricity, construction of photovoltaic systems on the school buildings’ roofs produces an educational effect as well. By installing a measuring and acquisition system which would include the measuring data on the photovoltaic power plant production parameters and school electricity consumption into school labs, technology would be closer to students, as well as possibilities to meet the demand for electricity from this basic renewable energy source. This paper presents the results of evaluations of the available roof surfaces of school buildings in Serbia for the photovoltaic panels installation. For each category of school building, an estimate of possible annual production per unit of average roof area was made. Summarizing all the results, estimates of possible installed capacity and annual electricity production for different scenarios are given.

scholarly journals Photovoltaic greenhouses: evaluation of shading effect and its influence on agricultural performances

2014 ◽  
Vol 45 (4) ◽  
pp. 168 ◽  
Author(s):  
Sergio Castellano
Keyword(s):  
Energy Efficiency ◽  
Rural Areas ◽  
Threshold Value ◽  
Plant Production ◽  
Photovoltaic Systems ◽  
Scientific Evaluation ◽  
Shading Effect ◽  
Photovoltaic Panels ◽  
Pv Modules ◽  
San Rafael

During the last years, European government remuneration polices promoted the realisation of photovoltaic systems integrated with the structures instead of on ground photovoltaic (PV) plants. In this context, in rural areas, greenhouses covered with PV modules have been developed. In order to interdict the building of greenhouses with an amount of opaque panels on covering not coherent with the plant production, local laws assigned a threshold value, usually between 25% and 50%, of the projection on the soil of the roof. These ranges seem not to be based on scientific evaluation about the agricultural performances required to the building but only on empirical assessments. Purpose of this paper is to contribute to better understand the effect of different configurations of PV panels on the covering of a monospan duo-pitched roof greenhouse in terms of shading effect and energy efficiency during different periods of the year. At this aim, daylighting and insolation analysis were performed by means of the software Autodesk<sup>®</sup> Ecotect<sup>®</sup> Analysis (Autodesk, Inc., San Rafael, CA, USA) on greenhouse model with different covering ratio of polycrystalline photovoltaic panels on the roof.

Remote monitoring of vital and activity parameters in chronic transfusion dependent patients: a case-crossover pilot using wearable biosensors (Preprint)

2021 ◽  
Author(s):  
Rik Tonino ◽  
Mackenzie Tweardy ◽  
Jaap Jan Zwaginga ◽  
Stephan Wegerich ◽  
Martin Roelof Schipperus
Keyword(s):  
Quality Of Life ◽  
Heart Rate ◽  
New Technologies ◽  
Standard Of Care ◽  
Red Cell ◽  
Web Based ◽  
Actual Performance ◽  
Red Cell Transfusion ◽  
Induced Changes

BACKGROUND Little is known if and to what extent outpatient RBC transfusions benefit chronic transfusion dependent patients. Costs, labour, and small but remaining side effects of RBC transfusions cause restrictive transfusions strategy to be the standard of care. However, the actual performance and quality of life of patients who require RBC’s on a regular basis are hardly accounted for. OBJECTIVE The aim of this study is to understand how new technologies and techniques like wearable biosensor devices and web-based testing can be used to measure physiological changes and functional activity in a cohort of transfusion-dependent patients. METHODS We monitored 5 patients who regularly receive transfusions during one transfusion cycle with the VitalPatch biosensor, the Withings Steel HR, and web-based cognitive and quality of life testing. RESULTS The deployed devices rendered qualitative and usable data. Heart rate and cognition showed to be significantly improved by RBC transfusions. Activity and quality of life measures did not show transfusion-induced changes. CONCLUSIONS The accelerateIQ platform, Withings Steel HR, and the CANTAB platform are usable for extracting and analysing data. Red cell transfusions significantly and reversibly decrease heart rate and increase sustained attention in our cohort of five red cell transfusion-dependent patients.

Simulation of Sugarcane Residues Co-Gasification (Vinasse-Straw-Bagasse) for Different Equivalence Ratios and Gasifying Agents

2021 ◽  
Vol 15 (1) ◽  
pp. 50-60
Author(s):  
Cláudia C. Santos ◽  
Janaine dos A. Oliveira ◽  
Igor de A. Barbieri ◽  
Filipe A. E Monhol
Keyword(s):  
Return On Investment ◽  
Energy Content ◽  
Operating Temperature ◽  
Energy Potential ◽  
Fuel Gas ◽  
Gasification Process ◽  
Thermoelectric Plant ◽  
Thermodynamic Equilibrium Model ◽  
Sugarcane Industry

This study evaluates the co-gasification of the main residues of the sugarcane industry (vinasse, bagasse and straw), in order to recover their energy and give an appropriate destination, making them suitable for use as fuel gas (syngas). To verify the feasibility of energy conversion through gasification, thermodynamic equilibrium model for gasification process was carried out and verified by literature available data. The gasification parameters for different gasification agents and equivalence ratio values were then obtained, such as: syngas composition and energy content, operating temperature, production rate and conversion efficiency. For equivalence ratios (ER) between 0.35 and 0.4 and temperatures around 750 °C, the quality of the syngas obtained is better, but a higher energy content is obtained in ER values of 0.2. There is a high H2/CO ratio for the gasifying agent formed by air and steam, and when using oxygen-enriched air, there is a change in the ER value that generates better syngas quality (to 0.3–0.35) and an increase in its energy content. There is also a possible better return on investment in a thermoelectric plant for the lowest ER values, which can increase gains by up to 21.4% and decrease the installation’s payback. The results indicate that the co-gasification of the waste is feasible, allowing a better use of its energy potential.

Are Individuals Sensitive to Changes in Performance when Interrupted?

2016 ◽  
Vol 60 (1) ◽  
pp. 241-245
Author(s):  
Cyrus K. Foroughi ◽  
Nicole E. Werner ◽  
Deborah A. Boehm-Davis
Keyword(s):  
Likert Scale ◽  
Subjective Ratings ◽  
Actual Performance ◽  
Essay Quality

Although there is an abundance of research showing how interruptions disrupt performance, there is little evidence regarding whether individuals believe they are personally affected by interruptions. The goal for this research was to determine whether individuals are sensitive to changes in performance when interrupted. Thirty-two participants wrote essays while interrupted or not interrupted and rated the quality of their essay on a 7-point Likert scale. Afterwards, the participants answered a separate 7-point Likert scale question that directly asked whether they believed that the interruptions negatively affected their performance. Participants' subjective ratings of their essay quality were not affected by the presence or absence of an interruption even though actual essay quality suffered from the interruptions. Additionally, a majority of the participants claimed that the interruptions had no or little impact on performance. Our data suggest individuals may not be sensitive to differences in their actual performance when interrupted.

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