On the relationship factor between the PV module temperature and the solar radiation on it for various BIPV configurations

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.

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Novas Considerações sobre a Fotoproteção no Brasil: Revisão de Literatura/New Considerations on the Photoprotection in Brazil: Literature Review

REVISTA CIÊNCIAS EM SAÚDE ◽

10.21876/rcsfmit.v5i3.375 ◽

1970 ◽

Vol 5 (3) ◽

pp. 80-96

Author(s):

Mayara Motta Melo ◽

Clarissa Santos de Carvalho Ribeiro

Keyword(s):

Skin Cancer ◽

Solar Radiation ◽

Literature Review ◽

Sun Exposure ◽

International Consensus ◽

De Se ◽

Literature Reviews ◽

Relationship Of ◽

The Relationship ◽

Harmful Effects

RESUMOA incidência do câncer de pele vem aumentando a cada ano. Sabe-se que entre outros fatores, a radiação solar é a principal responsável pelo desenvolvimento dessa patologia. A prevenção, feita através da fotoproteção, teria grande impacto nesse cenário. No entanto, as orientações sobre como se proteger dos malefícios do sol devem ser coerentes com a incidência solar da região, os hábitos da população e o fototipo da pele. Os conceitos sobre fotoproteção foram definidos por entidades européias e norte americanas e não devem ser reproduzidos para o Brasil de forma aleatória, pois a incidência solar no Brasil é muito maior, a população tem fototipos diferentes e o hábito de se expor ao sol é muito mais frequente. Portanto, faz-se necessário elaborar conceitos próprios para o Brasil e conscientizar a população sobre os perigos da radiação solar para que a incidência do câncer de pele reduza definitivamente. Essa revisão visa mostrar a relação da radiação solar no Brasil com a pele dos brasileiros e evidenciar a importância da fotoproteção para essa população. Para isso foi feito um levantamento de artigos originais, revisões de literatura, consensos brasileiros e internacionais e livros de dermatologia.Palavras-chave: Fotoproteção, Câncer de pele, Exposição solar, Radiação ultravioleta, Vitamina D. ABSTRACTThe incidence of skin cancer is increasing every year. It is known that among other factors, solar radiation is the main responsible for the development of this pathology. Prevention, made by photoprotection, would have great impact in this scenario. However, the guidelines on how to protect themselves from the sun's harmful effects should be consistent with the sunlight of the region, the habits of the population and the phototype skin. The concepts of photoprotection were defined by European and North American entities and should not be played for Brazil at random, as the solar incidence in Brazil is much higher, people have different skin types and the habit of sun exposure is much more frequent. Therefore, it is necessary to draw up own concepts for Brazil and raise awareness about the dangers of solar radiation, so that the incidence of skin cancer can be definitely reduced. This review aims to show the relationship of solar radiation in Brazil with the skin of Brazilian and to highlight the importance of sun protection for this population. With this purpose, it was made a survey of original articles, literature reviews , Brazilian and international consensus and dermatology books.Keywords: Photoprotection, Skin cancer, Sun exposure, Ultraviolet radiation, D vitamin.

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The role of L/W in the solar radiation for Saharian cities

E3S Web of Conferences ◽

10.1051/e3sconf/20199105006 ◽

2019 ◽

Vol 91 ◽

pp. 05006

Author(s):

Rami Qaoud ◽

Alkama Djamal

Keyword(s):

Solar Radiation ◽

Solar Energy ◽

Energy Levels ◽

Direct Solar Radiation ◽

Test Field ◽

Natural Lighting ◽

The Difference ◽

The Impact ◽

The Relationship

The urban fabric of the desert cities is based on the principle of reducing the impact of urban canyons on direct solar radiation. Here comes this research, which is based on a comparative study of the periods of direct solarisation and values of the solar energy of urban canyons via two urban fabrics that have different building densities, where the ratio between L/W is different. In order to obtain the real values of the solar energy (thermal, lighting), the test field was examined every two hours, each three consecutive days. The measurement stations are positioned by the three types of the relationship between L/W, (L≥2w, L=w, L≤0.5w). According to the results, we noticed and recorded the difference in the periods of direct solarization between the types of urban engineering canyons, reaching 6 hours a day, the difference in thermal values of air, reaching 4 °C, and the difference in periods of direct natural lighting, reaching 6 hours. It should be noted that the role of the relationship between L/W is to protect the urban canyons by reducing the impact of direct solar radiation on urban canyons, providing longer hours of shading, and reducing solar energy levels (thermal, lighting) at the urban canyons. This research is classified under the research axis (the studies of external spaces in the urban environment according to the bioclimatic approach and geographic approach). But this research aims to focus on the tracking and studying the distribution of the solar radiation - thermal radiation and lighting radiation - in different types of street canyons by comparing the study of the direct solarization periods of each type and the quantity of solar energy collected during the solarization periods.

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Mechanically Aspirated Solar Radiation Shields: A CFD and Neural Network Design Analysis

10.1115/imece2001/htd-24287 ◽

2001 ◽

Author(s):

B. M. Fichera ◽

R. L. Mahajan ◽

T. W. Horst

Keyword(s):

Neural Network ◽

Solar Radiation ◽

Temperature Sensor ◽

Temperature Measurements ◽

Analysis And Design ◽

Computational Fluid Dynamics Analysis ◽

Radiation Shields ◽

Input Variables ◽

The Relationship

Abstract Accurate air temperature measurements made by surface meteorological stations are demanded by climate research programs for various uses. Heating of the temperature sensor due to inadequate coupling with the environment can lead to significant errors. Therefore, accurate in-situ temperature measurements require shielding the sensor from exposure to direct and reflected solar radiation, while also allowing the sensor to be brought into contact with atmospheric air at the ambient temperature. The difficulty in designing a radiation shield for such a temperature sensor lies in satisfying these two conditions simultaneously. In this paper, we perform a computational fluid dynamics analysis of mechanically aspirated radiation shields (MARS) to study the effect of geometry, wind speed, and interplay of multiple heat transfer processes. Finally, an artificial neural network model is developed to learn the relationship between the temperature error and specified input variables. The model is then used to perform a sensitivity analysis and design optimization.

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The seasonal variability of the amount of global solar radiation reaching the ground in urban and rural areas on the example of Warsaw and Belsk

Miscellanea Geographica ◽

10.1515/mgrsd-2016-0022 ◽

2016 ◽

Vol 20 (4) ◽

pp. 29-37

Author(s):

Kinga Nelken ◽

Kamil Leziak

Keyword(s):

Solar Radiation ◽

Urban Area ◽

Rural Area ◽

Rural Areas ◽

Meteorological Data ◽

Global Solar Radiation ◽

Urban Station ◽

Reverse Relationship ◽

Urban And Rural Areas ◽

The Relationship

AbstractThe aim of this paper is to determine the contemporary differences in the inflow of global solar radiation in Warsaw (urban station) and Belsk (rural station). The meteorological data used comprised daily sums of global solar radiation (in MJ•m−2) and the duration of sunshine (in hours) for the period 2008 2014. On clear days in spring and summer, the rural area receives more solar radiation in comparison to the urban area, whereas in autumn a reverse relationship occurs. On cloudy days in all seasons, the rural area receives more solar radiation than the urban area, and the relationship is the strongest in winter. Differences between urban and rural areas on cloudy days are smaller than those observed on clear days.

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A dynamic model for series and parallel resistance of photovoltaic cell using material properties extraction and energy tunnel

ECTI Transactions on Electrical Engineering, Electronics, and Communications ◽

10.37936/ecti-eec.2018161.171324 ◽

2017 ◽

Vol 16 (1) ◽

pp. 9-21

Author(s):

Kotchapong Sumanonta ◽

Pasist Suwanapingkarl ◽

Pisit Liutanakul

Keyword(s):

Series Resistance ◽

Photovoltaic Cell ◽

Photovoltaic Module ◽

Practical Application ◽

Pv Module ◽

Proposed Model ◽

Outdoor Test ◽

The Relationship ◽

Parallel Resistance ◽

Novel Model

This article presents a novel model for the equivalent circuit of a photovoltaic module. This circuit consists of the following important parameters: a single diode, series resistance (Rs) and parallel resistance (Rp) that can be directly adjusted according to ambient temperature and the irradiance. The single diode in the circuit is directly related to the ideality factor (m), which represents the relationship between the materials and significant structures of PV module such as mono crystalline, multi crystalline and thin film technology. Especially, the proposed model in this article is to present the simplified model that can calculate the results of I-V curves faster and more accurate than other methods of the previous models. This can show that the proposed models are more suitable for the practical application. In addition, the results of the proposed model are validated by the datasheet, the practical data in the laboratory (indoor test) and the onsite data (outdoor test). This ensures that the less than 0.1% absolute errors of the model can be accepted.

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An empirical correlation of ambient temperature impact on PV module considering natural convection

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v19.i2.pp627-634 ◽

2020 ◽

Vol 19 (2) ◽

pp. 627

Author(s):

Kamil Jadu Ali ◽

Ahmed Hasan Mohammad ◽

Ghanim Thiab Hasan

Keyword(s):

Natural Convection ◽

Solar Radiation ◽

Ambient Temperature ◽

Analytical Model ◽

Incident Angle ◽

Tracking System ◽

Empirical Correlations ◽

Pv Module ◽

Pv Modules ◽

Temperature Impact

<p><span>In this paper, the effect of the ambient temperature on the PV modules for different angles of inclinations and different intensities of the solar radiation on the surface of the PV module is considered by using empirical correlations for natural convection. An analytical model based on the energy balance equilibrium between the PV module and the environment conditions has been used. Also an expression for calculating the electric power of silicon PV modules in a function of the ambient temperature, the intensity of the solar radiation, the incident angle of the solar radiation to the surface of the PV module and the efficiency of the PV modules at STC conditions have been used. By comparing the obtained both results, it can be seen that the largest deviation between the power values obtained by the analytical model and expression is about (5 %). The results obtained indicates that in the case of a small number of PV modules corresponding to the required number for an average household, it is more economical to invest additional resources in increasing the PV module's surface area than in case of the PV module with sun tracking system. </span></p>

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Interaction of Concentrated Solar Radiation with Materials

10.47363/jnsrr/2020(2)115 ◽

2020 ◽

pp. 1-3

Author(s):

Muhammad-Sultanhan Paizullahanov ◽

◽

Rasul Akbarov ◽

Abdurashid Abdurakhim Uglu ◽

Kholmatov, Muslimbek Mukhsinjon ugli Sobirov ◽

...

Keyword(s):

Dielectric Properties ◽

Solar Radiation ◽

Recovery Process ◽

Solar Furnace ◽

Structure And Properties ◽

Technological Parameters ◽

Fine Grained ◽

Concentrated Solar Radiation ◽

The Relationship ◽

Synthesis Of Materials

The paper analyzes approaches to modeling the processes of interaction of concentrated solar radiation with materials. The experimental results obtained on the synthesis of materials from a melt in a solar furnace are presented. It is shown that when melting in a solar furnace under the influence of concentrated solar radiation of high density due to the acceleration of the recovery process, it is possible to obtain a fine-grained microstructure that gives the material enhanced mechanical and dielectric properties. It is shown that the relationship between the structure and properties of the materials obtained with the technological parameters of melting and cooling in a solar furnace can be used as an approach to modeling the interaction of concentrated solar radiation with materials

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Monitoring the performances of a maximum power point tracking photovoltaic (MPPT PV) pumping system driven by a brushless direct current (BLDC) motor

International Journal of Renewable Energy Development ◽

10.14710/ijred.8.2.193-201 ◽

2019 ◽

Vol 8 (2) ◽

pp. 193

Author(s):

Ba Abdellahi ◽

Mohamed El Mamy Mohamed Mahmoud ◽

Ne Ould Dah ◽

Amadou Diakité ◽

Aroudam El Hassen ◽

...

Keyword(s):

Solar Radiation ◽

Water Flow ◽

Bldc Motor ◽

Maximum Power Point ◽

Pumping System ◽

Point Tracking ◽

Power Point Tracking ◽

Dc Power ◽

Power Point ◽

The Relationship

Nowadays, water pumping systems powered by solar-cell generators are one of the most important applications. It’s a promising alternative to conventional electricity and diesel based pumping systems, especially for applications like community water supplies and irrigation. This study presents a monitored standalone photovoltaic solar direct pumping system using the Maximum Power Point Tracking (MPPT) algorithm to optimize the solar photovoltaic conversion efficiency. It was done at ISET-Rosso in Mauritania. The experimental setup based on Lorentz PS1200C-SJ8-5 pumping system consists of four photovoltaic (PV) panels, inverter PS1200, BLDC motor, centrifugal pump and a storage tank. The system has been monitored, in order to determine the relationship between: the DC power produced by the PV generator and the solar radiation; the water flow and the DC power and by then the relationship between the water flow and the solar radiation. The effect of ambient temperature and solar radiation on the PV panels was also done under Matlab/Simulink environment and compared to the experimental results. ©2019. CBIORE-IJRED. All rights reserved

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