Energy Yield of Solar Panels in the System of their Position Control

2014 ◽  
Vol 521 ◽  
pp. 37-40 ◽  
Author(s):  
Miroslav Rimár ◽  
Štefan Kuna ◽  
Marcel Fedák
Keyword(s):  
Solar Radiation ◽  
Position Control ◽  
Climatic Conditions ◽  
Energy Yield ◽  
Solar Panels ◽  
Fixed Position ◽  
Heat Transfer Medium ◽  
Incident Solar Radiation ◽  
The Third ◽  
Solar Radiation Intensity

The contribution deals with the climatic conditions in which a solar rotatable structure with flat solar panels was placed on the roof of the building in which the Department of Process Technique is located. There was designed a control system of the structure in order to achieve an increase in efficiency of solar panels. Presented are three ways of the rotatable structure positioning. During the first measurements, the data were obtained and recorded with a fixed position of the solar panels, the second measurements were carried out while the solar panels were rotating along the ecliptic without being dependent on the actual value of the solar radiation intensity, while with the third measurements the rotation was initiated depending on the intensity of the incident solar radiation on the collectors surface. The archived data obtained from individual measurements are presented in the graphs which show the advantage of solar panels rotation in terms of achieving higher temperatures of a solar fluid and a heat transfer medium of an accumulation tank.

Numerical Simulation of a Novel Solar-Powered Hybrid Energy System with Cooling and Heating

2011 ◽  
Vol 374-377 ◽  
pp. 470-474
Author(s):  
Hui Long Luo ◽  
Xiao Chen ◽  
Jin Hui Peng
Keyword(s):  
Solar Radiation ◽  
Energy System ◽  
Climatic Conditions ◽  
Coefficient Of Performance ◽  
Water Heater ◽  
Performance Simulation ◽  
Hybrid Energy System ◽  
Hybrid Energy ◽  
Solar Radiation Intensity ◽  
Solar Powered

A novel solar-powered hybrid energy system with cooling and heating is presented, which consists of an adsorption ice maker subsystem and water heater subsystem. It can be used as an ice maker and water heater hybrid system or a single water heater respectively according to incident solar radiation intensity. A numerical model is developed to predict the performances of the hybrid energy system. Performance simulation and analysis on the hybrid energy system have been made. Simulation results show that, under the climatic conditions of daily solar radiation being about 12-20MJ/m2, the hybrid energy system can be used as an ice maker and a water heater effectively, its daily solar cooling COP (coefficient of performance) is about 0.173 - 0.181, the daily heating coefficient of performance is about 0.294-0.327.

scholarly journals Analysis of influence of climatic factors on selecting types of solar panels

2020 ◽  
Vol 2020 (2) ◽  
pp. 21-26
Author(s):  
Sergey Vladimirovich Golovko ◽  
Dmitry Anatolyevich Zadorkin
Keyword(s):  
Solar Cell ◽  
Solar Radiation ◽  
Cell Surface ◽  
Alternative Energy ◽  
Climatic Factors ◽  
Climatic Conditions ◽  
Solar Panels ◽  
Efficient Operation ◽  
The Impact ◽  
Solar Rays

The article outlines the problem of the influence of climatic factors on the efficiency of solar panels operation. Not long ago the idea of free electricity seemed incredible. However, the development of technologies rapidly progresses, and the alternative energy captures more and more supporters every day. The popularity of solar panels is growing quite rapidly, since photovoltaic converters are an efficient source of electricity. But for more efficient operation of solar cells it is necessary to create the specific conditions, taking into account the location of the unit. There have been considered the factors of more efficient operation of the photovoltaic converters: the hash climatic conditions and the intensity of solar radiation depending on the angle of reducing the impact of the solar rays onto the solar cell surface.

scholarly journals Efficiency of solar radiation conversion in photovoltaic panels

2018 ◽  
Vol 10 ◽  
pp. 02014 ◽  
Author(s):  
Sławomir Kurpaska ◽  
Jarosław Knaga ◽  
Hubert Latała ◽  
Jakub Sikora ◽  
Wiesław Tomczyk
Keyword(s):  
Solar Radiation ◽  
Ambient Temperature ◽  
Conversion Efficiency ◽  
Radiation Intensity ◽  
Radiation Energy ◽  
Climatic Conditions ◽  
Ambient Conditions ◽  
Photovoltaic Panels ◽  
Solar Radiation Intensity ◽  
Radiation Conversion

This paper included analysis the conversion efficiency in photovoltaic panels. The tests were done between February and June at a test stand equipped with three commonly used types of photovoltaic panels: poly- and monocrystalline silicon and with semi-conductive layer made of copper (Cu), indium (In), gallium (Ga) and selenium (Se) (CIGS). Five days of each month were selected for a detailed analysis. They were close to the so-called recommended day for calculations in solar power engineering. Efficiency, calculated as the yield of electrical energy in relation to solar radiation energy reaching the panels was made conditional upon solar radiation intensity and ambient temperature. It was found that as solar radiation intensity and ambient temperature increase, the efficiency of solar radiation conversion into electricity is reduced. Correlation dependence was determined for the test data obtained, describing temperature change of panels depending on climatic conditions. It was found that as panel temperature increases, the conversion efficiency is reduced. Within the tested scope of experiment conditions, the efficiency was reduced in the range between 20.1 and 22.8%. The authors also determined the average efficiency values in individual test months together with average ambient conditions of the environment where the process of solar radiation conversion took place.

Effects of Exterior Sun Shades on Heat Transfer by Solar Radiation

2014 ◽  
Vol 935 ◽  
pp. 61-65 ◽  
Author(s):  
Chih Hong Huang ◽  
Shin Yu Tsai
Keyword(s):  
Heat Transfer ◽  
Solar Radiation ◽  
Building Materials ◽  
Precast Concrete ◽  
Climatic Conditions ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Wall Structures ◽  
Solar Radiation Intensity ◽  
Reduced Scale

Heat transfer in walls, as affected by climatic conditions such as fluctuations in outside air temperature, solar radiation intensity and wind speed as well as wall structures and heat transfer coefficients of materials, becomes a complex and non-steady state. The aim of this paper is to examine the relationship between total whole-day solar radiation and heat absorbed by and released from materials. An reduced scale of experiment was conducted using reduced scale precast concrete slabs and focusing on the effect of heat transfer involving solar radiation, building materials and shading rate. The results show that even though the sun shadings would stem partly the solar radiation into the wall, yet they obstruct in the mean time the release of the heat, which absorbed hours ago. That leads to a temperature raise and uncomfort to the interiors.

scholarly journals A New Method to Determine the Annual Energy Output of Liquid-Based Solar Collectors

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4586 ◽  
Author(s):  
Zukowski ◽  
Radzajewska
Keyword(s):  
Solar Radiation ◽  
Air Temperature ◽  
Hot Water ◽  
Energy Output ◽  
Total Solar Radiation ◽  
Energy Yield ◽  
Solar Collectors ◽  
Solar Panels ◽  
Outdoor Air ◽  
Solar Thermal Collectors

One of the most effective ways to reduce greenhouse gas emissions is the widespread use of solar panels. A new approach to estimating the annual energy output ESC of liquid-based solar thermal collectors is presented in this paper. The main parameters of the surrounding environment that affect the energy yield from solar water heating (SWH) systems are total solar radiation ES and outdoor air temperature θO. Here, two functions are developed that allow the specification of the ESC value based on these two previously determined factors. The article presents the subsequent stages that led to the development of this method. In the first step, the computer model of a solar domestic hot water (SDHW) system was built in the EnergyPlus environment. An object of the modeling procedure was the real solar installation located at Bialystok University of Technology. The database containing the annual energy output of the solar collectors, total solar radiation, and outdoor air temperature was developed based on the results of simulations made for 24 Polish cities. Then, the multiple regression method (implemented in Statistica v.13.1) was used to correlate these variables. Two contour graphs were also developed to determine the energy yield from solar collectors.

scholarly journals Modification of the epicuticular waxes of plant leaves due to increased sunlight intensity

2020 ◽  
Vol 28 (1) ◽  
pp. 29-33
Author(s):  
Y. V. Lykholat ◽  
N. A. Khromykh ◽  
O. O. Didur ◽  
A. A. Alexeyeva ◽  
T. Y. Lykholat
Keyword(s):  
Fatty Acids ◽  
Solar Radiation ◽  
Free Fatty Acids ◽  
Steppe Zone ◽  
Component Composition ◽  
Climatic Conditions ◽  
Epicuticular Waxes ◽  
Plant Leaves ◽  
Solar Radiation Intensity ◽  
Long Chain

Climatic changes observed around the world in recent years are associated with an increase in the solar radiation intensity and temperature and reduction in the humidity. Fluctuations of environmental factors significantly change the conditions for the existence of plants, which dictates the need for adaptive reactions of plant organisms at the different levels of their organization. Such dangerous processes as excessive heating of the surface of plant leaves and water loss can be prevented by the formation of a cuticle, which is a complex composition consisting of cutin and the soluble intracuticular and epicuticular waxes. We suggested that the structure, component composition and properties of the cuticle of trees undergo adaptive changes due to microclimatic conditions in different parts of the tree crown. The study was aimed at the identification and evaluation of light-induced differences in the accumulation and composition of leaf epicuticular waxes of Ulmus trees (native U. minor Mill. and alien U. pumila L.), and was conducted in 2018–2019 in Dnipro city located in the steppe zone of Ukraine. Analysis of the waxes’ chloroform extracts was carried out using GC Shimadzu 2010 PLUS equipped with a flame ionization detector and capillary column SP-2560. The highest amount of epicuticular waxes (12.23 ± 0.39 µg/cm2) was on the sunlit leaves of U. pumila, and wax deposits on the sunned leaves exceeded twice those on the shaded leaves in both U. minor and U. pumila. Long-chain hydrocarbons detected in the epicuticular waxes of both elm species were represented by free fatty acids, aldehydes, alcohols, and n-alkanes in various ratios. In the epicuticular waxes of U. minor, fatty acids dominated both on shaded and sunned leaves, while alkanes together with alcohols were the main components in U. pumila waxes, especially on the sunlit leaves. According to our results, local high illumination of leaves in the crown of both elm species caused increase in share of long-chain alkanes (1.2–1.9 times), but simultaneous reduction of the content of free fatty acids (1.5–16.8 times) in the epicuticular waxes’ composition. General patterns of the leaf epicuticular waxes’ modification due to increased solar radiation and air temperature can indicate the adaptive metabolic responses of woody plants to changing climatic conditions.

scholarly journals Autonomous complex for electro-thermal heating of oil wells fed by a photovoltaic installation

2021 ◽  
Vol 266 ◽  
pp. 04006
Author(s):  
Y.E. Shklyarskiy ◽  
V.V. Starshaya
Keyword(s):  
Solar Radiation ◽  
Energy Savings ◽  
Electricity Consumption ◽  
Reducing Power ◽  
Oil Production ◽  
Electric Heating ◽  
Climatic Conditions ◽  
Total Solar Radiation ◽  
Oil Well ◽  
Solar Panels

Paraffin deposits are a serious problem causing complications in oil production. This article describes the creation of a complex operatingonphotovoltaic installations to combat paraffin deposits. The authors offer an innovative method for accurate calculation of the parameters of photovoltaic installations, taking into account changes in total solar radiation, geographical and climatic conditions, the angle of inclination of solar panels, characteristics of the power source, and oil parameters. Measurements of solar radiation are carried out on the basis of mathematical and simulation modeling in Matlab Simulink. The results of the studies confirm the adequacy of the proposed method of oil well heating. This method of electric heating has a simple design and does not require underground works and well shutdown. Thus, it will improve the efficiency of oil production, prevent the formation of paraffin deposits, and ensure energy savings by reducing power losses and electricity consumption.

Effects of Fresnel Len Application on PV Module Performance

2016 ◽  
Vol 839 ◽  
pp. 177-181
Author(s):  
Paisit Luangjok ◽  
Somchai Maneewan ◽  
Atthakorn Thongtha
Keyword(s):  
Solar Cell ◽  
Solar Radiation ◽  
Fresnel Lens ◽  
Maximum Efficiency ◽  
Solar Panels ◽  
Lower Efficiency ◽  
Solar Module ◽  
Pv Module ◽  
Solar Radiation Intensity ◽  
Module Performance

Effects of shading and blocking of solar radiation intensity through Fresnel lens onto solar cell were investigated in this work. Fresnel lens was made of polyvinyl chloride to concentrate the solar radiation onto the polycrystalline silicon solar cell with the 0.767 m x 0.670 m in size and no cooling under the solar panels. The temperature and efficiency comparisons between solar module with and without Fresnel lens were observed. The performance of the two modules overtime is assessed by monitoring the characteristic I-V and P-V curves. The maximum efficiency of the solar panels with Fresnel lens and without Fresnel lens in each hour was approximately 5-6.7% and 8.8-11.5%, respectively. This lower efficiency of PV module with Fresnel lens was a result of unsuitable distance of Fresnel lens that operated with the PV module.

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