scholarly journals Concept of Bee-Eyes Array of Fresnel Lenses as a Solar Photovoltaic Concentrator System

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Nura Liman Chiromawa ◽  
Kamarulazizi Ibrahim
Keyword(s):  
Solar Cell ◽  
Concentration Factor ◽  
Flux Distribution ◽  
Transmission Efficiency ◽  
Solar Photovoltaic ◽  
High Concentration ◽  
Photovoltaic Application ◽  
Fresnel Lenses ◽  
Optical Concentrator ◽  
Mathematical Relations

This paper presents a proposal of a new configuration of an optical concentrator for photovoltaic application which may enhance the efficiency of solar cells. Bee-eyes array Fresnel lenses concentrator proposed here provide high concentration factor which is greater than1000x at the 20th zone. In addition, the system also provides room for increasing the number of zones to achieve the high concentration factor if needs arise. The transmission efficiency greater than 90% has been achieved with f-number of ≥1.25. Mathematical relations derived to obtain flux distribution at the absorber plane and the transmission efficiency as well as the position of the solar cell were used in the ray tracing simulations for 6, 18, 36, 60, 90, 126, 168, 216, 270, and 330 suns concentration systems. A transmission efficiency is linearly decreasing with the increase in the number of arrays in which the transmission efficiency of 94.42% was recorded at the array of 6 suns and 74.98% at 330 suns.

A Novel High Concentration Fresnel Lens as a Solar Concentrator

2021 ◽  
pp. 1-29
Author(s):  
Kuldeep Awasthi ◽  
Desireddy Shashidhar Reddy ◽  
Mohd. Kaleem Khan
Keyword(s):  
Optical Axis ◽  
Spherical Aberration ◽  
Spherical Surface ◽  
Fresnel Lens ◽  
High Concentration ◽  
Aperture Diameter ◽  
Convex Lens ◽  
Flat Base ◽  
Fresnel Lenses ◽  
Outer Vertex

Abstract This paper describes the design methodology for a novel Fresnel lens. The original Fresnel lens is obtained from a plano-convex lens, whose spherical surface is split into a number of divisions (called facets), collapsed onto the flat base. Thus, all the facets of the original Fresnel lens have the same radius as that of the plano-convex lens. The proposed design aims to achieve better ray concentration and reduced spherical aberration than the original Fresnel lens by constructing spherical facets with unequal radii. The centers and radii of facets are constrained so that the ray refracted from the bottom vertex of each facet on one side of the optical axis and the ray refracted from the outer vertex of the corresponding facet on the other side of the optical axis must intersect at the focal plane. The proposed lens design has resulted in a 275% gain in the concentration ratio and a 72.5% reduction in the spherical aberration compared to the original lens of the same aperture diameter and number of facets. The performance of both novel and original Fresnel lenses when used as solar concentrators with a conical coil receiver is evaluated. The novel Fresnel lens led to increased heat gain and resulted in a compact solar collector design.

scholarly journals Determination of Technological Features of a Solar Photovoltaic Cell Made of Monocrystalline Silicon P+PNN+

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Cristian-Petre Fluieraru ◽  
Gabriel Predușcă ◽  
Horia Andrei ◽  
Emil Diaconu ◽  
Petru Adrian Cotfas ◽  
...  
Keyword(s):  
Solar Cell ◽  
Renewable Energy Sources ◽  
Electronic Devices ◽  
Photovoltaic Cell ◽  
Monocrystalline Silicon ◽  
Semiconductor Materials ◽  
Solar Photovoltaic ◽  
Photovoltaic Solar Cell ◽  
Photovoltaic Solar Cells

The development in the field of semiconductor materials and electronic devices has a great impact on systems with renewable energy sources. Determination of the functional parameters of photovoltaic solar cells is essential for the subsequent usage of these semiconductor devices. Research was made on type P+PNN+ monocrystalline silicon wafers. Crystallographic measurements of the photovoltaic solar cell were made by means of FESEM-FIB Auriga Workstation. Initial data were selected from the study of models found in the specialized literature. The experimental results were compared to classical mathematical models. Measurements made on the photovoltaic solar cell were realised in laboratory conditions on the NI-ELVIS platform produced by National Instruments.

scholarly journals Theoretical Investigation of the Temperature Limits of an Actively Cooled High Concentration Photovoltaic System

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1902 ◽  
Author(s):  
Asmaa Ahmed ◽  
Katie Shanks ◽  
Senthilarasu Sundaram ◽  
Tapas Kumar Mallick
Keyword(s):  
Solar Cell ◽  
Concentration Ratio ◽  
Photovoltaic System ◽  
Thermal System ◽  
Outlet Temperature ◽  
Water Mixture ◽  
High Concentration ◽  
Cell Temperature ◽  
Photovoltaic Thermal System ◽  
Different Types

Concentrator photovoltaics have several advantages over flat plate systems. However, the increase in solar concentration usually leads to an increase in the solar cell temperature, which decreases the performance of the system. Therefore, in this paper, we investigate the performance and temperature limits of a high concentration photovoltaic Thermal system (HCPVT) based on a 1 cm2 multi-junction solar cell subjected to a concentration ratio from 500× to 2000× by using three different types of cooling fluids (water, ethylene glycol and water mixture (60:40), and syltherm oil 800). The results show that, for this configuration, the maximum volumetric temperature of the solar cell did not exceed the manufacturer’s recommended limit for the tested fluids. At 2000× the lowest solar cell temperature obtained by using water was 93.5 °C, while it reached as high as 109 °C by using syltherm oil 800, which is almost equal to the maximum operating limit provided by the manufacturer (110 °C). Overall, the best performance in terms of temperature distribution, thermal, and electrical efficiency was achieved by using water, while the highest outlet temperature was obtained by using syltherm oil 800.

Use of Silicone Oil and Coconut Oil as Liquid Spectrum Filters for BSPVT: With Emphasis on Degradation of Liquids by Sunlight

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Sandeep S. Joshi ◽  
Ashwinkumar S. Dhoble
Keyword(s):  
Solar Cell ◽  
Silicone Oil ◽  
Spectral Response ◽  
Coconut Oil ◽  
Aging Effect ◽  
Photovoltaic System ◽  
Electrical Performance ◽  
Thermal System ◽  
Solar Photovoltaic ◽  
Photovoltaic Thermal System

The solar photovoltaic thermal system (PVT) facilitates conversion of incoming solar radiations into heat and electricity simultaneously. The beam split photovoltaic thermal system (BSPVT) is one of the PVT systems. In this system, the incoming solar beam is splitted and used separately for PV and thermal system. The feasibility of water, silicone oil, and coconut oil as spectrum filter for C–Si solar photovoltaic system is reported in the literature recently. However, the changes in the optical behavior of the liquids due to extended exposure to sunlight (aging effect) had not been considered in most of the previous studies. The current study includes the methodology for the selection of liquids for BSPVT systems, estimation of external quantum efficiency (EQE) of a solar cell using liquids, and the aging effect on the liquid spectrum filters. The spectral response of the solar cell is analyzed using BENTHAM, (PVE 300) for 300–1100 nm. In this study, it has been observed that the aging of silicone oil reduces the electrical performance of the solar cell. On the other hand, the aged coconut oil improves the electrical performance of the solar cell as compared to the fresh coconut oil spectrum filter.

Characteristics of Nanostructured TiO2 Prepared by One-Step Soaking Method for Photovoltaic Application

2014 ◽  
Vol 705 ◽  
pp. 3-7
Author(s):  
Mi Sun Park ◽  
Shi Joon Sung ◽  
Dae Hwan Kim
Keyword(s):  
Solar Cell ◽  
Reaction Time ◽  
Solar Cell Device ◽  
Flat Structure ◽  
Substrate Orientation ◽  
Short Reaction Time ◽  
Photovoltaic Application ◽  
One Step ◽  
Inorganic Semiconductor ◽  
Photovoltaic Characteristics

Nanostructured TiO2 films were prepared by a one-step soaking method, which has many advantages, such as simple fabrication, a short reaction time, and fast growth. We have investigated the growth of TiO2 films by the substrate orientation of the soaking method, which had an effect on the nanostructure of the TiO2 films. The TiO2 films prepared by this method had various structures: particulate-flat structure and sphere-flat structure. To determine the effect of the nanostructure of TiO2 films on the photovoltaic characteristics of solar cells, solar cell devices using the inorganic semiconductor Sb2S3 as a sensitizer were fabricated by chemical bath deposition (CBD). Our solar cell device, using TiO2 film with a sphere-flat structure as a photoelectrode, exhibited JSC, VOC, FF, and η values of 11.82 mA / cm2, 0.49 V, 30.27 %, and 1.74 %, respectively.

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