scholarly journals RESOLUTION IN PHOTOVOLTAIC POTENTIAL COMPUTATION

2016 ◽  
Vol III-4/W1 ◽  
pp. 89-96
Author(s):  
N. Alam ◽  
V. Coors ◽  
S. Zlatanova ◽  
P. J. M. Oosterom
Keyword(s):  
Solar Energy ◽  
Incident Energy ◽  
Computation Time ◽  
Diffuse Radiation ◽  
Time Interval ◽  
Object Surface ◽  
Precise Estimation ◽  
Building Models ◽  
Depth Analysis ◽  
Energy Incident

In this paper, an analysis of the effect of the various types of resolution involved in photovoltaic potential computation is presented. To calculate solar energy incident on a surface, shadow from surrounding buildings has been considered. The incident energy on a surface has been calculated taking the orientation, tilt and position into consideration. Different sky visibility map has been created for direct and diffuse radiation and only the effect of resolution of the factors has been explored here. The following four resolutions are considered: 1. temporal resolution (1, 10, 60 minutes time interval for calculating visibility of sun), 2. object surface resolution (0.01, 0.1, 0.375, 0.75, 1.25, 2.5 and 5 m<sup>2</sup> as maximum triangle size of a surface to be considered), 3. blocking obstacle resolution (number of triangles from LoD1, LoD2, or LoD3 CityGML building models), and 4. sky resolution (ranging from 150 to 600 sky-patches used to divide the sky-dome). Higher resolutions result in general in more precise estimation of the photovoltaic potential, but also the computation time is increasing, especially as realizes that this computation has to be done for every building with its object surface (both roofs and façades). This paper is the first in depth analysis ever of the effect of resolution and will help to configure the proper settings for effective photovoltaic potential computations

scholarly journals RESOLUTION IN PHOTOVOLTAIC POTENTIAL COMPUTATION

2016 ◽  
Vol IV-4/W1 ◽  
pp. 89-96
Author(s):  
N. Alam ◽  
V. Coors ◽  
S. Zlatanova ◽  
P. J. M. Oosterom
Keyword(s):  
Solar Energy ◽  
Incident Energy ◽  
Computation Time ◽  
Diffuse Radiation ◽  
Time Interval ◽  
Object Surface ◽  
Precise Estimation ◽  
Building Models ◽  
Depth Analysis ◽  
Energy Incident

In this paper, an analysis of the effect of the various types of resolution involved in photovoltaic potential computation is presented. To calculate solar energy incident on a surface, shadow from surrounding buildings has been considered. The incident energy on a surface has been calculated taking the orientation, tilt and position into consideration. Different sky visibility map has been created for direct and diffuse radiation and only the effect of resolution of the factors has been explored here. The following four resolutions are considered: 1. temporal resolution (1, 10, 60 minutes time interval for calculating visibility of sun), 2. object surface resolution (0.01, 0.1, 0.375, 0.75, 1.25, 2.5 and 5 m<sup>2</sup> as maximum triangle size of a surface to be considered), 3. blocking obstacle resolution (number of triangles from LoD1, LoD2, or LoD3 CityGML building models), and 4. sky resolution (ranging from 150 to 600 sky-patches used to divide the sky-dome). Higher resolutions result in general in more precise estimation of the photovoltaic potential, but also the computation time is increasing, especially as realizes that this computation has to be done for every building with its object surface (both roofs and façades). This paper is the first in depth analysis ever of the effect of resolution and will help to configure the proper settings for effective photovoltaic potential computations.

scholarly journals Remote Sensing for Cultural Heritage Assessment and Monitoring: The Case Study of Alba Iulia

2021 ◽  
Vol 13 (3) ◽  
pp. 1406 ◽  
Author(s):  
Cristian Moise ◽  
Iulia Dana Negula ◽  
Cristina Elena Mihalache ◽  
Andi Mihai Lazar ◽  
Andreea Luminita Dedulescu ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Cultural Heritage ◽  
Heritage Management ◽  
Time Interval ◽  
Urban Landscapes ◽  
Persistent Scatterer Interferometry ◽  
Heritage Site ◽  
Depth Analysis ◽  
Assessment And Monitoring ◽  
Historical Past

In recent times, satellite-based remote sensing has a growing role in archaeology and inherently in the cultural heritage management process. This paper demonstrates the potential and usefulness of satellite imagery for the documentation, mapping, monitoring, and in-depth analysis of cultural heritage and the archaeological sites located in urban landscapes. The study focuses on the assessment and monitoring of Alba Iulia, which is one of the Romanian cities with the richest historical past. Multitemporal analysis was performed to identify the land use/land cover changes that might contribute to an increased cultural heritage vulnerability to natural disasters. A special emphasis was dedicated to the assessment of the built-up area growth and consequently of the urbanization trend over a large time interval (30 years). Next, the urbanization and urban area expansion impact was further analyzed by concentrating on the urban heat island within Alba Iulia city and Alba Iulia Fortress (located in the center of the city). As temperature change represents a key element of climate change, the temperature trend within the same temporal framework and its impact on cultural heritage were determined. In the end, with regard to the cultural heritage condition assessment, the research was complemented with an assessment of the urban ground and individual building stability, using persistent scatterer interferometry. The results contribute to the detailed depiction of the cultural heritage site in such a manner that the site is monitored over an extensive timeframe, its current state of conservation is accurately determined, and the future trends can be identified. In conclusion, the present study offers reliable results regarding the main factors that might endanger the cultural heritage site as a basis for future preservation measures.

scholarly journals Tilt Angle Optimization and Formulation of Annual Adjustment Models for a Solar Power Plant Setup-able Site at Himachal Pradesh, India

2020 ◽  
Vol 9 (7) ◽  
pp. 1181-1185
Keyword(s):  
Power Plant ◽  
Solar Energy ◽  
Tilt Angle ◽  
Solar Power ◽  
Performance Enhancement ◽  
Diffuse Radiation ◽  
Himachal Pradesh ◽  
Solar Power Plant ◽  
Solar Tracking ◽  
Tracking Devices

Solar tracking devices are quite effective for collecting maximum solar radiations but for vastly spread solar energy collection plant, their usage is suppressed due to large cost involvement. The best alternative to this problem is adjustment of tilt angle at most appropriate position. In this study monthly optimum tilt angle have been identified for a solar power plant setup-able site Kalth (φ 30.85046˚, L 77.06153˚), situated at Himachal Pradesh, India. For diffuse radiation estimation, an isotropic model has been used. By considering the impracticality involved in monthly tilt angle adjustment, various annual adjustment models have been formulated for two, three and four annual adjustments. In order to estimate the increment in solar insolation by adopting these models, Performance Enhancement (PE) have been computed from the conventional method of setting the solar collector tilt equal to latitude angle. The results show that PE is maximum for monthly optimum tilt angles followed by M-4 which is a three annual adjustment model. Based on PE requirement, any of the proposed models can be selected for setting up solar energy collection plant at suggested site.

scholarly journals Evaluation of Optimal Occasional Tilt on Photovoltaic Power Plant Energy Efficiency and Land Use Requirements, Iran

2021 ◽  
Vol 13 (18) ◽  
pp. 10213
Author(s):  
Amirhossein Fathi ◽  
Masoomeh Bararzadeh Ledari ◽  
Yadollah Saboohi
Keyword(s):  
Power Plant ◽  
Solar Radiation ◽  
Solar Energy ◽  
Orientation Angle ◽  
Optimum Operating ◽  
Time Interval ◽  
Time Intervals ◽  
Optimum Time ◽  
Equal Time ◽  
Geographical Regions

The paper studies the optimum panel horizontal orientation angle toward the Sun and the optimum time interval of the panel’s movement. The optimum time intervals or panel movement can change the rate of input energy to the panel surface in Iran. For this purpose, a neural network has been trained to estimate the intensity of solar radiation in Iran. After model validation, the intensity of solar radiation has been estimated by selecting adequate geographical regions. Based on the intensity of sunlight, Iran has been divided into ten regions. In these regions, 40 cities have been randomly selected to study the effect of the panel’s angle variations within appropriate time intervals, as well as equal time intervals. The results show that the choice of the mounting system with the possibility of five angles’ implementation can increase the amount of solar energy between 3.9% and 7.4%. Compared to this number of angles at the equal time intervals, the amount of incoming solar energy has increased by 3% to 7%. In the first and second cases, the area of the power plant increases by about 12% to 24% compared to the yearly optimum tilt angle. Moreover, the amount of radiation incoming to the panel with the optimum operating angle is in alignment with the results of PVsyst software.

Solution of the Radiative Integral Transfer Equations in Rectangular Absorbing, Emitting, and Anisotropically Scattering Homogeneous Medium

2004 ◽  
Vol 126 (1) ◽  
pp. 137-140 ◽  
Author(s):  
Zekeriya Altac¸ ◽  
Mesut Tekkalmaz
Keyword(s):  
Heat Flux ◽  
Incident Energy ◽  
Homogeneous Medium ◽  
Diffuse Radiation ◽  
Bottom Wall ◽  
Tabular Form ◽  
Benchmark Problem ◽  
Net Heat Flux ◽  
Transfer Equations

Radiative integral transfer equations for a rectangular absorbing, non-emitting, and linearly anisotropically scattering homogeneous medium are solved numerically for the incident energy and the net heat flux components using the method of “singularity subtraction.” A benchmark problem is chosen as a rectangular homogeneous cold participating medium which is subject to externally uniform diffuse radiation on the bottom wall. The solutions for the incident energy and net heat flux components for selected points for a square domain are provided in tabular form for benchmarking purposes.

scholarly journals Simulation Analysis of Contributing Factors to Rider Visibility Issues for Car-Motorcycle Accidents

2019 ◽  
Vol 48 (3) ◽  
pp. 203-209
Author(s):  
Danish Farooq ◽  
Janos Juhasz
Keyword(s):  
Collision Avoidance ◽  
High Speed ◽  
Simulation Analysis ◽  
Point Of View ◽  
Time Interval ◽  
Contributing Factors ◽  
Depth Analysis ◽  
Collision Safety ◽  
Motorcycle Accidents ◽  
Safety Systems

Rider visibility has been considered an important issue in car-motorcycle accidents due to the frequency of unperceptive and negligent driving behavior. Mostly car drivers stated that they didn’t see the rider before the collision. This study aims to investigate the contributing factors that reduce rider visibility in point of view of car drivers for car-motorcycle accidents. The study considered the car-motorcycle accidents which occur in the built-up area. Statistical data analysis categorized the accidents into six dominant accident types. Twenty-five accidents were selected by accident types for simulation analysis. The selected accidents were simulated in Virtual Crash software during 5 seconds before the collision. The simulation analysis evaluated that the view obstructions, blind spots and high speed were the contributing factors that reduce rider visibility in car-motorcycle accidents. The simulation plots identified the involvement of contributory factors and variation within the time interval. The comprehensive in-depth analysis also evaluated that no collision avoidance maneuvers were performed by most of the car drivers due to visibility issues before the collision. Safety systems were proposed based on observed factors according to car and motorcycle perspectives for collision avoidance.

Study on Solar Assisted Different Heat Source Heating for School Building in Rural of Gansu

2014 ◽  
Vol 587-589 ◽  
pp. 315-319
Author(s):  
Cai Qin Hou ◽  
Hui Hou
Keyword(s):  
Carbon Dioxide ◽  
Solar Energy ◽  
Heat Source ◽  
Water Supply ◽  
Carbon Dioxide Emissions ◽  
Residential Buildings ◽  
Gansu Province ◽  
Hot Water ◽  
Depth Analysis ◽  
Hot Water Supply

Gansu province is rich in solar energy resources ,solar energy is clean and reproducible energy,it has an important advantage once we use solar energy in heating,supplying hot water in residential buildings. In the vast rural areas of Gansu, carbon emissions is huge because of slow way of heating and dirty fuel,such as briquette ,straw and so on. In this paper, we have a in-depth analysis on different forms of solar assisted heat source for hot water supply and heating, focusing on energy-saving effect, carbon dioxide emissions,and total energy deficit.The results show solar assisted biomass boiler is a worthy manner for heating and hot water supply ,it can save energy more than 60%. More important is it can reduce carbon dioxide emissions large extently.

Developing and Evaluation of Various Correlations for Diffuse Solar Radiation for Urla (Izmir, Turkey)

2012 ◽  
Vol 135 (2) ◽  
Author(s):  
Orhan Ekren
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Tracking System ◽  
Diffuse Radiation ◽  
Energy System ◽  
Solar Irradiation ◽  
Total Solar Radiation ◽  
Total Radiation ◽  
Diffuse Solar Radiation ◽  
Tilted Surface

Characteristics of site-specific solar irradiation is required to optimize a solar energy system. If no tracking system is used, the amount of electricity or heat produced by solar energy depends on the total solar radiation on a tilted surface. Although pyranometer measures direct plus diffuse solar radiation on a horizontal surface, there are many locations where diffuse radiation is not measured. Also, diffuse radiation is necessary to determine the total radiation on a tilted surface. Therefore, in this study, new correlations for diffuse solar radiation is proposed as a function of atmospheric parameters for Urla (Izmir, Turkey). After applying the statistical procedure on the measured data, seven new correlations are proposed for the ratio of hourly average diffuse and total radiation. Also, the ratio of monthly average daily diffuse and total radiation for this region is proposed.

scholarly journals Identification of “bottlenecks” in the systems of adaptability in peach cultivars to specific abiotic factors limiting plant growth and development and affecting individual phases of ontogenesis to develop optimal algorithms for further breeding

2021 ◽  
Vol 181 (4) ◽  
pp. 112-119
Author(s):  
I. A. Dragavtseva ◽  
V. A. Dragavtsev ◽  
A. P. Kuznetsova ◽  
A. V. Klyukina
Keyword(s):  
Low Temperatures ◽  
Abiotic Factors ◽  
Time Interval ◽  
Environment Interaction ◽  
Developmental Phase ◽  
Negative Effects ◽  
Genotype Environment Interaction ◽  
Depth Analysis ◽  
New Strategy ◽  
Developmental Phases

Modern breeding, especially when fruit plants cultivated for decades at the same location are concerned, requires a new strategy to develop cultivars resistant to abiotic limfactors of the environment. A more in-depth analysis of genotype–environment interaction phenomena is needed, as modern studies have shown that the level of plant productivity and yields is determined not by specific “genes of quantitative traits”, but mainly by the emergent (newly occurring when a lim-factor of the environment changes at the ontogenetic and phytocenotic levels) effects of the genotype–environment interaction (GEI). New knowledge is needed about the values of contributions to the productivity of a cultivar made by each of the genetic–physiological systems of plant adaptability (GPS-ad) when exposed to a particular lim-factor of the environment at a particular phase of ontogenesis. For the first time, aiming at finding promising peach genotypes for further breeding, we studied their adaptability to low temperatures in different horticulture zones of Krasnodar Territory.Shifts in the effects of low-temperature environmental stressors in the developmental phases of cultivars (produced by climate change) were analyzed in the time interval of 1985–2018.The presence of hereditary adaptive reserves for increasing peach productivity for each phase of development in the process of studying the phenomena of GEI was disclosed. Recommendations are given to breeders on phase-to-phase breeding of future cultivars: how to protect their production process at each developmental phase from negative effects of low temperatures. 

scholarly journals Implementation of Big Data Analytics for Simulating, Predicting & Optimizing the Solar Energy Production

2021 ◽  
Author(s):  
Jabar Yousif
Keyword(s):  
Big Data ◽  
Renewable Energy ◽  
Solar Energy ◽  
Energy Production ◽  
Big Data Analytics ◽  
Quantitative Measure ◽  
Design Stage ◽  
Depth Analysis ◽  
Qualitative Variables ◽  
Mathematical Techniques

<p>This paper investigated and reviewed the current big data methods and tools in solar energy production. It discusses the comprehensive two-stage design and evaluation for examining the optimal structure for renewable energy systems. In the design stage, technical and economic aspects are discussed based on a robust analysis of all input/output variables for determining the highest performance. Next, assess and evaluate the effectiveness of each method under different circumstances conditions. Then convert each qualitative indicator into a quantitative measure using extensive data analysis methods to determine the overall performance of the various qualitative variables. The paper also provides an in-depth analysis of the mathematical techniques used in measuring the efficiency of the renewable energy production system and discussing future axes of work in the field of specific energy.</p>

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