scholarly journals Pengaruh jumlah haluan pipa paralel pada kolektor surya plat datar absorber batu kerikil terhadap laju perpindahan panas

2016 ◽  
Vol 6 (2) ◽  
Author(s):  
M. Wirawan ◽  
R. Kurniawan ◽  
Mirmanto Mirmanto
Keyword(s):  
Renewable Energy ◽  
Solar Radiation ◽  
Solar Energy ◽  
Thermal Energy ◽  
Solar Collector ◽  
Alternative Energy ◽  
Mesh Size ◽  
The Other ◽  
Energy Crisis ◽  
Better Than

Recently the use of energy increases. It leads to the energy crisis. Therefore, it is important to promote alternative energy (renewable energy). One of renewable energies, which is potential in Indonesia, is solar enrgy. Solar energy can be harvested using a solar collector. This device can collect or absorb solar radiation and convert it to thermal energy. In this study, two identical collectors are used. One collector consists of 7 pipes and the other comprises 9 pipes. The overall dimension of the collector is 100 cm x 80 cm x 10 cm and the absorber of the collector is made of gravels with a mesh size of 9.5 -12.5 mm. The collectors are placed with a slope of 15o facing to North. The volumetric rates of water used in the experiments are 300 cc / min, 350 cc / min and 400 cc / min. The results show that the collector with 9 pipes is better than that with 7 pipes.

scholarly journals Heliosystem of Auxiliary Heat Supply for a Mining Enterprise

2020 ◽  
Vol 7 (1) ◽  
pp. G9-G14
Author(s):  
S. Shkrylova ◽  
V. Kostenko ◽  
I. Skrynetska
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Electric Power ◽  
Thermal Energy ◽  
Solar Collector ◽  
Alternative Energy ◽  
Experimental Studies ◽  
Hot Water ◽  
Ecological Crisis ◽  
Stable Operation

In the conditions of the global ecological crisis in the world and Ukraine, the issue of finding alternative energy sources becomes relevant. One of the most common types of renewable energy is solar energy. In Ukraine today, the most promising direction of using solar energy is its direct transformation into low-potential thermal energy. To get electric power, solar radiation is the mere alternative to electric power generated from mined fuel, and without the pollution of air and water, or adverse consequences manifested in global warming. The disadvantage of this type of installation is the limitation of the duration of light time, as well as the effect of cloudiness. During the day, the number of solar radiation changes, to stabilize it is necessary to accumulate and accumulate it for further use, the technical implementation of stable operation of solar installation due to the use of terrestrial radiation and the accumulator of a specific part of solar energy is proposed. The purpose of the work is experimental studies to ensure the stable operation of the solar collector under cloudy conditions. The paper is aimed at the stabilization of the operation of the solar installation and to obtain additional heat after the Sun’s cloud cover. The use of a solar thermal collector is advisable in solar heating and hot water systems in conditions of alternating solar radiation. The results of physical modeling have proved the efficiency of the method of combining types of thermal radiation, due to the accumulation of energy it is possible to increase the quantitative index of solar energy in the conditions of cloudiness by 3 times Keywords: alternative energy, solar energy, solar collector, thermal energy, clouds, terrestrial radiation, ecology.

scholarly journals Analysis of Nanofluids Behavior in Concentrated Solar Power Collectors with Organic Rankine Cycle

2019 ◽  
Vol 2 (3) ◽  
pp. 22 ◽  
Author(s):  
Samuel Sami
Keyword(s):  
Solar Radiation ◽  
Thermal Energy ◽  
Solar Collector ◽  
Base Fluid ◽  
Solar Power ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
The Other ◽  
Enhancement Effect ◽  
Thermal Oil

In this paper, the performance of nanofluids in a Parabolic Trough Concentrating Solar Collector (CSP)-based power generation plant, an Organic Rankine Cycle (ORC), and a Thermal Energy Storage (TES) system is studied. This study is intended to investigate the enhancement effect and characteristics of nanofluids Al2O3, CuO, Fe3O4 and SiO2 in integrated concentrating solar power (CSP) with ORC, and TES under different solar radiations, angles of incidence, and different nanofluid concentrations. The refrigerant mixture used in the ORC loop to enhance the ORC efficiency is an environmentally sound quaternary mixture composed of R134a, R245fa, R125, R236fa. The results showed that the power absorbed, and power collected by the CSP collector and thermal energy stored in the storage tank are enhanced with the increase of the solar radiation. It was also found that the CSP hybrid system efficiency has been enhanced mainly by the increase of the solar radiation and higher nanofluid concentrations over the thermal oil as base fluid. Also, the study concludes that the nanofluid CuO outperforms the other nanofluids—Al2O3, Fe3O4 and SiO2—and has the highest CSP solar collector performance compared to the other nanofluids and thermal oil base fluid under study at similar conditions. Finally, it was found that the model’s prediction compares fairly with data reported in the literature; however, some discrepancies exist between the model’s prediction and the experimental data.

scholarly journals Analysis of the Use of Photovoltaic Solar Energy as a Source of Alternative Energy in Manaus City

2019 ◽  
Vol 7 (11) ◽  
pp. 380-387
Author(s):  
Maíra Raquel Dinelli Pequeno ◽  
Renata Sabrina De Matos Marques ◽  
Sara Dos Santos Santarém ◽  
David Barbosa de Alencar ◽  
Ricardo Silva Parente
Keyword(s):  
Energy Source ◽  
Renewable Energy ◽  
Solar Radiation ◽  
Solar Energy ◽  
Alternative Energy ◽  
Fossil Fuels ◽  
Sustainable Growth ◽  
Grid System ◽  
Technology Knowledge ◽  
Photovoltaic Solar Energy

The need for other sources of renewable energy is present, due to sustainable growth and aiming at the dull use of fossil fuels, which is a non-renewable energy responsible for the greenhouse effect and, in its end, can generate conflicts between countries, due to its dependence. . Brazil has an advantage, in front of other countries that already use this energy source frequently, because it is the country with the highest rate of solar radiation, is not enjoyed in abundance, because it is not so accessible due to poor incentives and lack of technology knowledge. As a clean and sustainable alternative photovoltaic solar energy becomes attractive. Based on these data, this work conducts an analysis of the photovoltaic solar grid system on grid (grid) system, to take as an alternative energy.

scholarly journals PENGARUH JUMLAH PIPA TERHADAP LAJU PELEPASAN KALOR PADA KOLEKTOR SURYA ABSORBER BATU GRANIT

2015 ◽  
Vol 5 (2) ◽  
Author(s):  
Made Wirawan ◽  
Mirmanto Mirmanto ◽  
Rudy Sutanto
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Ambient Temperature ◽  
Alternative Energy ◽  
The Other ◽  
The Sun ◽  
Solar Collectors ◽  
Glass Cover ◽  
The North ◽  
Alternative Energies

Fossil energies as un-renewable energies have been getting depletion. Therefore, the use of alternative energy should be raised. One of the alternative energies is solar energy. Solar energy does not pollute the environment and is categorized as a renewable energy which is free and plentiful.   In this research, the solar energy was used to heat water by operating granite absorber solar collectors. The water was flowed naturally from a higher tank and adjusted using a valve fitted at the outlet of the collector.  The volumetric rates of the water were 200, 250 and 300 cc/minutes. Two identical solar collectors with an overall dimension of 0,8 m x 1 m x 0,1 m were placed under the sun and faced to the North with an inclination angle of 15°. One collector contained 5 parallel pipes and the other comprised 7 parallel pipes.  Data obtained in this research are glass cover temperatures, an ambient temperature, absorber temperatures, inlet and outlet water temperatures, and water volumetric rates. The results show that the 7 parallel pipe collector products higher outlet water temperature and energy than the 5 parallel pipe collector. Consequently, in the process of energy removal/discharge, the heat stored in the 7 parallel pipe collector runs out quicker.   

Micro Solar Thermal Collector Glazing for Enhanced Thermal Energy Harvesting

2012 ◽  
Author(s):  
E. Ogbonnaya ◽  
L. Weiss
Keyword(s):  
Solar Energy ◽  
Thermal Energy ◽  
Alternative Energy ◽  
Capture Efficiency ◽  
Solar Thermal ◽  
Small Scale ◽  
Collector Plate ◽  
Research Areas ◽  
Area Of Interest ◽  
Solar Thermal Collector

Increasing focus on alternative energy sources has produced significant progress across a wide variety of research areas. One particular area of interest has been solar energy. This has been true on both large and small-scale applications. Research in this paper presents investigations into a small-scale solar thermal collector. This approach is divergent from traditional micro solar photovoltaic devices, relying on transforming incoming solar energy to heat for use by devices like thermoelectrics. The Solar Thermal Collector (STC) is constructed using a copper collector plate with electroplated tin-nickel selective coating atop the collector surface. Further, a unique top piece is added to trap thermal energy and reduce convective, conductive, and radiative losses to the surrounding environment. Results show a capture efficiency of 92% for a collector plate alone when exposed to a 1000 W/m2 simulated solar source. The addition of the top “glazing” piece improves capture efficiency to 97%. Future work will integrate these unique devices with thermoelectric generators for electric power production. This will yield a fully autonomous system, capable of powering small sensors or other devices in remote locations or supplementing existing devices with renewable energy.

Preliminary results on the determination of solar energy potential using LiDAR technology

2015 ◽  
Vol 6 (1) ◽  
pp. 11-17 ◽  
Author(s):  
G. Szabó ◽  
P. Enyedi ◽  
Gy. Szabó ◽  
I. Fazekas ◽  
T. Buday ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Energy Production ◽  
Alternative Energy ◽  
Surface Model ◽  
Solar Panels ◽  
Energy Potential ◽  
Potential Surfaces ◽  
Large Power ◽  
Automatic Data

According to the challenge of the reduction of greenhouse gases, the structure of energy production should be revised and the increase of the ratio of alternative energy sources can be a possible solution. Redistribution of the energy production to the private houses is an alternative of large power stations at least in a partial manner. Especially, the utilization of solar energy represents a real possibility to exploit the natural resources in a sustainable way. In this study we attempted to survey the roofs of the buildings with an automatic method as the potential surfaces of placing solar panels. A LiDAR survey was carried out with 12 points/m2 density as the most up-to-date method of surveys and automatic data collection techniques. Our primary goal was to extract the buildings with special regard to the roofs in a 1 km2 study area, in Debrecen. The 3D point cloud generated by the LiDAR was processed with MicroStation TerraScan software, using semi-automatic algorithms. Slopes, aspects and annual solar radiation income of roof planes were determined in ArcGIS10 environment from the digital surface model. Results showed that, generally, the outcome can be regarded as a roof cadaster of the buildings with correct geometry. Calculated solar radiation values revealed those roof planes where the investment for photovoltaic solar panels can be feasible.

scholarly journals DEVELOPMENT OF SOLAR ENERGY IN UKRAINE IN THE CONTEXT OF THE TRANSITION TO THE CARBON-NEUTRAL ECONOMY

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
T. Pimonenko ◽  
O. Lyulyov ◽  
N. Letunovska ◽  
O. Lytvynenko ◽  
A. Nazarenko
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Alternative Energy ◽  
Renewable Energy Sources ◽  
Developed Countries ◽  
Energy Sources ◽  
Advantages And Disadvantages ◽  
Alternative Energy Sources ◽  
Research And Innovation ◽  
Leading Position

The article aims to study current trends in the use of solar energy in Ukraine and the world as one of the main directions of decarbonization of the national economy. The authors systematize the prospects, advantages and disadvantages of the development of renewable energy sources. They conducted a comparative analysis of the "efficiency" of solar energy in some countries and Ukraine. The authors determined that the leading position in terms of the share of energy consumed from renewable sources is occupied by countries with developed economies due to the availability of effective motivational mechanisms. From the experience of EU countries, the authors concluded that renewable energy sources form a prerequisite for obtaining additional socio-economic and environmental effects. In the presence of favorable market conditions, renewable energy sources can increase the level of energy security in the country and its energy independence. The article analyzes the legislation of Ukraine on stimulating the development of alternative energy. The authors proposed two opposed ways of further developing solar energy in Ukraine. In particular, the country can implement methods of using alternative energy, which developed countries have successfully implemented. Another area involves increasing research and innovation in implementing, using, maintaining, and utilizing energy-generating devices from alternative energy sources. Despite the polarity of the proposed directions for further development of renewable energy, in both cases, the state policy on attracting investment and promoting the use of energy from alternative energy sources is crucial. In addition, the authors noted the benefits for society from the development and implementation of alternative energy sources. The scaling up and promotion of energy production technologies from alternative sources can reduce carbon emissions, which has been an urgent problem globally.

scholarly journals STUDI POTENSI LIMBAH TEMBAKAU MENJADI BIO-OIL MENGGUNAKAN METODE FAST-PYROLYSIS SEBAGAI ENERGI TERBARUKAN

2020 ◽  
Vol 5 (2) ◽  
pp. 151
Author(s):  
Rafiqi Rajauddin Amin ◽  
Rimbi Rodiyana Sova ◽  
Dewinta Intan Laily ◽  
Dina Kartika Maharani
Keyword(s):  
Renewable Energy ◽  
Alternative Energy ◽  
Renewable Energy Sources ◽  
Rapid Development ◽  
Fast Pyrolysis ◽  
Energy Crisis ◽  
Efficient Production ◽  
Pyrolysis Method ◽  
Bio Oil ◽  
Tobacco Waste

The rapid development of industry causes the need for fuel and energy to increase, especially fossil fuels (petroleum). This has the effect of an energy crisis. Biomass is of particular concern as one of the renewable energy sources to address the current energy crisis.  Biomass consists of hemiselulose, cellulose, and lignin that can be converted into liquids (bio-oils) of pyrolysis. One of the wastes that can be converted into bio-oil is tobacco waste. Tobacco waste is produced by more than 2 million tons eachs. The waste has the potential to be further processed into bio oil using fast pyrolysis method with efficient and quality bio-oil manufacturing measures. The bio-oil results from tobacco waste using the fast pyrolysis method have values of carbon, hydrogen, nitrogen, oxygen and other organic compounds and the H/C ratio is greater than the yield of tobacco waste bio-oil using the low pyrolysis method. Where the bio-oil of tobacco waste using the fast pyrolysis method has a high heating value equivalent to the distribution of hydrocarbons from biodiesel, which means it has the potential as an alternative energy to replace petroleum. The potential as a substitute fuel for petroleum must also be balanced with fast and efficient production, maximizing bio-oil production by selecting the reactor and the optimum temperature usedKeywords: Waste, Tobacco, Bio-Oil, Renewable Energy, Fast-pyrolisis

Alternative energy capital of the world? Fix, risk, and solar energy in Los Angeles’ urban periphery

2021 ◽  
pp. 251484862110543
Author(s):  
Sean F Kennedy ◽  
Ryan Stock
Keyword(s):  
Renewable Energy ◽  
Los Angeles ◽  
Solar Energy ◽  
Alternative Energy ◽  
Financial Risk ◽  
Risk Mitigation ◽  
The United States ◽  
Policy Framework ◽  
Energy Infrastructure ◽  
The World

California is one of the most climate-challenged regions of North America and is considered the vanguard of climate action in the United States. California's climate policy framework has strongly promoted the expansion of renewable energy infrastructure, and the state generates more solar energy than any other in the nation. Using the case of Lancaster, a city of 170,000 residents in northern Los Angeles County seeking to position itself as the “alternative energy capital of the world,” this article examines private investments in solar energy infrastructure as a response to California's entwined economic and ecological crises. Drawing on recent scholarship on socioecological fix, we argue that private accumulation through renewable energy infrastructures in California has required both the presence of crisis conditions and innovations in financial risk mitigation that manage tensions between mobility and fixity inherent in the formation of fixed capital. However, a narrow focus on short-term financial risk obviates other forms of risk, including future impacts of extreme weather on grid infrastructure and electricity supply. While this does not foreclose opportunities for solar energy infrastructure to support positive social and ecological transformation, we argue that such opportunities may be constrained under a mode of energy transition predicated on private accumulation.

Designing a novel solar-assisted heat pump system with modification of a thermal energy storage unit

2019 ◽  
Vol 233 (5) ◽  
pp. 588-603 ◽  
Author(s):  
Mustafa Aktaş ◽  
Meltem Koşan ◽  
Erhan Arslan ◽  
Azim Doğuş Tuncer
Keyword(s):  
Energy Storage ◽  
Solar Energy ◽  
Heat Pump ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Solar Collector ◽  
Working Fluid ◽  
Storage Unit ◽  
Heating Systems ◽  
Energy Storage Unit

The integrated usage of solar energy systems, heat pump applications, and thermal energy storage units is an effective way for heating systems due to their sustainability and stability in operations. In this study, a novel direct solar-assisted heat pump with thermal energy system has been designed which uses the solar collector as the evaporator of the heat pump. Besides, two-dimensional transient numeric analyses have been conducted for the thermal energy storage unit using the ANSYS Fluent 16.2 commercial software package. With this direct system, the heat required for heating systems is supplied from the condenser with the heat received from the solar collector of the working fluid. For an effective and high performance system, the solar collector is designed as a double-pass which provided superheating of the working fluid. It is aimed to store the surplus energy from the solar energy in the thermal energy storage unit and to operate the system continuously and efficiently in both sunny and overcast weather conditions. Furthermore, the system has been analyzed theoretically and the results show that coefficient of performance may improve. As a result, this newly designed system can be successfully applied for thermal applications.

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