Estimation of the Influence of Fresnel Lens Temperature on Energy Generation of a Concentrator Photovoltaic System

2011 ◽  
Author(s):  
Thorsten Hornung ◽  
Marc Steiner ◽  
Peter Nitz ◽  
Frank Dimroth ◽  
Sarah Kurtz ◽  
...  
Keyword(s):  
Energy Generation ◽  
Fresnel Lens ◽  
Photovoltaic System

Model (At Least) Twice, Build Once: Experiences With the Design–Bid–Build Process for Solar Photovoltaic Arrays

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Brian Dougherty ◽  
Matthew Boyd
Keyword(s):  
System Modeling ◽  
Energy Generation ◽  
Lessons Learned ◽  
Photovoltaic System ◽  
Solar Photovoltaic ◽  
Modeling Tools ◽  
Design Elements ◽  
Renewable Energy Generation ◽  
Key Events ◽  
Design Bid Build

Commercial-scale solar photovoltaic (PV) arrays were designed, constructed, and are now operational on the Gaithersburg, Maryland campus of the National Institute of Standards and Technology (NIST). A design–bid–build process was followed where the contractors used photovoltaic system modeling tools both during the initial design phase and during the postbid, prebuild phase. To help investigate the specific aspects of the contractors' evolving designs, the authors conducted their own independent photovoltaic system modeling. This independent modeling helped identify design elements that could be improved and so aided efforts to maximize the annual renewable energy generation. An estimated 2.5% gain in annual energy generation is being realized as a result of this independent modeling effort. To provide context for the modeling work and the lessons learned, key events impacting the design–bid–build process are described. The installed systems are summarized and also contrasted with the proposed designs. The power generation at three sites are compared over two different 12-month intervals.

Real-Time Analysis of Energy Generation of a Photovoltaic System Installed in the City of Lajeado, Rio Grande do Sul

2016 ◽  
Vol 26 (2) ◽  
pp. 105-119
Author(s):  
Luís Eduardo Fontana ◽  
Alberto Benguria Bezama ◽  
Camila Hasan ◽  
Munique Marder ◽  
Odorico Konrad
Keyword(s):  
Real Time ◽  
Rio Grande ◽  
Energy Generation ◽  
Photovoltaic System ◽  
Rio Grande Do Sul ◽  
Time Analysis ◽  
Real Time Analysis ◽  
The City

scholarly journals Techno-Economic Performance Analysis of a 40.1 kWp Grid-Connected Photovoltaic (GCPV) System after Eight Years of Energy Generation: A Case Study for Tochigi, Japan

2021 ◽  
Vol 13 (14) ◽  
pp. 7680
Author(s):  
Ghoname Abdullah ◽  
Hidekazu Nishimura
Keyword(s):  
Economic Performance ◽  
Capacity Utilization ◽  
Data Access ◽  
Energy Generation ◽  
Photovoltaic System ◽  
Performance Ratio ◽  
Solar Irradiation ◽  
International Electrotechnical Commission ◽  
Utilization Factor ◽  
And Performance

In this paper, the grid-connected photovoltaic system in Tochigi prefecture, Japan, is presented, and its technical and economic performance after eight years is evaluated. The system has a peak power of 40.1 kWp and has been in operation since 2012. The entire electricity generated by the system was fed into the state grid. The system is suitably monitored for one year (2019) and analyzed using the parameters developed and defined in the standard IEC 61724-1 by the International Electrotechnical Commission. The system’s different parameters included array yield, final yield, capacity utilization factor, and performance ratio of the system. An analytical model with solar irradiation obtained from Power Data Access Viewer was developed to investigate and evaluate the efficiency of the system monthly and annual energy generation by comparing the simulated and measured energy acquired from the inverter. A positive linear relationship is observed between solar irradiation data obtained from Power Data Access Viewer and the grid-connected photovoltaic system energy injected into the utility grid. While an annual total of 48,521 kWh of energy was expected to be generated, 38,071 kWh was generated and injected into the utility in 2019. This study also introduces and explains the mechanism of the Feed-In-Tariff system in Japan. The performance of the grid-connected photovoltaic system under this study was compared with that of other systems installed across the globe.

scholarly journals Experimental Comparison between Spherical and Refractive Optics in a Concentrating Photovoltaic System

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4603
Author(s):  
Carlo Renno
Keyword(s):  
Physical Phenomenon ◽  
Electric Energy ◽  
Fresnel Lens ◽  
Energy Performance ◽  
Photovoltaic System ◽  
Experimental Comparison ◽  
Spherical Mirror ◽  
Acceptance Angle ◽  
Optical Efficiency ◽  
Solar Tracking

Since there are not standard configurations of the Concentrating Photovoltaic (CPV) systems, several types of optics are designed and analyzed. In this paper, the optical performances of a spherical mirror and a commonly used Fresnel lens of the same diameter are compared, highlighting their impact on the CPV system energy performance. First, the absolute and percentual variation trends of optical concentration factor and optical efficiency as function of the distance between each optical system and receiver are analyzed. The concentration levels obtained by means of the spherical mirror are much higher than the Fresnel lens, with maximum values of optical efficiency equal to 72.8% and 24.1%, respectively. The analysis of the concentration reduction due to a solar-tracking failure has also allowed the estimation of the acceptance angle, thus observing that the spherical mirror requires a less accurate solar tracker with respect to the Fresnel lens, especially if a secondary optics is adopted. As for the energy comparison, the spherical mirror allows increase of the Triple-Junction (TJ) cell temperature up to about 65 °C higher than the environmental temperature and to reach an electrical power of about 15 W in correspondence of a concentrated solar radiation of 470 kW/m2. Finally, the deviation between the cumulative electric energy produced by the TJ cell in the cases of correct and incorrect solar tracking and for the configurations with and without secondary optics has been also evaluated for both the optics. The equations experimentally obtained in this paper represent a more accurate tool to describe the physical phenomenon in comparison with the equations theoretically obtained for similar CPV systems. The results can be used to design a real CPV system that adopts a Fresnel lens or a spherical mirror. The equations experimentally obtained in this paper represent a more accurate tool to describe the physical phenomenon in comparison with the equations theoretically obtained for similar CPV systems. The results can be used to design a real CPV system that adopts a Fresnel lens or a spherical mirror.

scholarly journals Possibilities of Using Fuel Cells for Energy Generation in Agricultural Greenhouses: A Case Study in Crete, Greece

2019 ◽  
Vol 11 (8) ◽  
pp. 113
Author(s):  
John Vourdoubas
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Renewable Energy Sources ◽  
Specific Energy Consumption ◽  
Energy Generation ◽  
Proton Exchange ◽  
Photovoltaic System ◽  
Low Carbon ◽  
Solar Pv ◽  
Solar Photovoltaics

The possibility of using fuel cells powered by solar hydrogen for energy generation in greenhouses with reference to the island of Crete, Greece has been examined. Change of fossil fuels used in greenhouses with renewable energies and sustainable energy technologies is very important for mitigation of climate change. Various renewable energy sources and low carbon emission technologies including geothermal energy, biomass, solar photovoltaics and co-generation systems have been used so far. Use of solar photovoltaics for generating electricity consumed in water electrolysis for hydrogen production has been investigated. Hydrogen feeding a proton exchange membrane fuel cell co-generating electricity and heat was used in a greenhouse located in Crete, Greece. The system could be useful in a stand-alone greenhouse with annual specific energy consumption at 150 KWh/m2. A solar photovoltaic system with nominal power at 33.33 KWp powering an electrolytic cell at 5.71 KW could produce annually 2,083 kg hydrogen. The hydrogen could feed a fuel cell at 1.71 KWel generating annually all the electricity required in a greenhouse of 1,000 m2. Co-produced heat could also cover 11.11% of the annual heat requirements in the greenhouse. It was found though that the overall electric efficiency of the system was very low at 4.5%. The low overall efficiency and the size of the solar-PV required indicate that the abovementioned energy system is not suitable in commercial agricultural greenhouses.

Design of Linear Fresnel Lens for Concentrated Photovoltaic System

2013 ◽  
Vol 860-863 ◽  
pp. 32-36
Author(s):  
Je Heon Song ◽  
Jin Hee Yu ◽  
Jun Ho Lee ◽  
Won Keon Jang ◽  
Dong Gil Lee
Keyword(s):  
Sensitivity Analysis ◽  
Fresnel Lens ◽  
Photovoltaic System ◽  
Solar Concentrator ◽  
Medium Concentration

This paper describes the design of a linear Fresnel concentrating lens for a medium concentration type solar concentrator and reports the results of a sensitivity analysis.

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