scholarly journals Using genetic algorithms for estimating Weibull parameters with application to wind speed

2020 ◽  
Vol 10 (1) ◽  
pp. 137-146
Author(s):  
Melih Burak Koca ◽  
Muhammet Burak Kilic ◽  
Yusuf Şahin
Keyword(s):  
Renewable Energy ◽  
Wind Speed ◽  
Weibull Distribution ◽  
Method Of Moments ◽  
Energy Demand ◽  
Model Parameters ◽  
Renewable Energy Resources ◽  
Initial Value ◽  
Important Place ◽  
Iterative Techniques

Renewable energy has become a prominent subject for researchers since fossil fuel reserves have been decreasing and are not promising to meet the energy demand of the future. Wind takes an important place in renewable energy resources and there is extensive research on wind speed modeling. Herein, one of the most commonly used distributions for wind speed modeling is the Weibull distribution with its simplicity and flexibility. Maximum likelihood (ML) method is the most frequently used technique in Weibull parameter estimation. Iterative techniques such as Newton-Raphson (NR) use random initial values to obtain the ML estimators of the parameters of the Weibull distribution. Therefore, the success of the iterative techniques highly depends on the initial value selection. In order to deliver a solution to the initial value problem, genetic algorithm (GA) is considered to obtain the estimators of the model parameters. The ML estimators obtained using the GA and NR techniques are compared with the method of moments (MoM) estimators via Monte Carlo simulation and wind speed applications. The results show that the ML estimators obtained using GA present superiority over MoM and the ML estimators obtained using NR.

scholarly journals The Investigation of Savonius Type and Darrieus H Type Wind Turbine Simulation with Wind Speed Variable

2021 ◽  
Vol 1 (2) ◽  
pp. 19-26
Author(s):  
Wibby Aditya Putra Utama ◽  
Yohandri Bow ◽  
M. Syahirman Yusi
Keyword(s):  
Renewable Energy ◽  
Wind Speed ◽  
Wind Turbine ◽  
Energy Demand ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Vertical Axis ◽  
Renewable Energy Resources ◽  
Vertical Axis Wind Turbine ◽  
Fan Speed

The demand for electrical energy that continues to increase along with the advancement of civilization and also the increasing number of people as well as the reduced level of fulfillment and availability of non-renewable energy sources, it is necessary to have renewable energy resources that capable of fulfill these energy demand in a more environmental friendly. One of the natural energies that we can use is wind energy, which is easy to get and lasts continuously. This research examines the comparison of the power generated from the vertical axis wind turbine savonius type and darrieus H type. The wind that use in this research get from from the fan. The test is doing by varying the wind speed by adjusting the fan speed. The fan is directed to the wind turbine to rotate the wind turbine. To measure the wind speed produced by the fan, a digital anemometer is used. The result of this research is the relation data of voltage to rpm and voltage to wind speed of wind turbine.

Review on Renewable Energy Potential in Australian Subtropical Region (Central and North Queensland)

2011 ◽  
Vol 347-353 ◽  
pp. 3846-3855 ◽  
Author(s):  
Ali Baniyounes ◽  
Gang Liu ◽  
M. G. Rasul ◽  
M. M. K. Khan
Keyword(s):  
Renewable Energy ◽  
Wind Speed ◽  
Spatial Databases ◽  
Cost Effective ◽  
Climatic Conditions ◽  
Energy Resources ◽  
Climatic Data ◽  
Renewable Energy Resources ◽  
Subtropical Region ◽  
Energy Potential

In Australia the future demand for energy is predicted to increase rapidly. Conventional energy resources soaring prices and environmental impact have increased the interest in renewable energy technology. As a result of that the Australian government is promoting renewable energy; such as wind, geothermal, solar and hydropower. These types of energy are believed to be cost-effective and environmentally friendly. Renewable energy availability is controlled by climatic conditions such as solar radiation, wind speed and temperature. This paper aims to assess the potential of renewable energy resources, in particular wind and solar energy in an Australian subtropical region (Central and North Queensland) namely, Gladstone, Emerald, Rockhampton, Yeppoon, Townsville, and Cairns. Analysis is done by using the latest statistical state of Queensland energy information, along with measured data history of wind speed, solar irradiations, air temperature, relative humidity, and atmospheric pressure for those sites. This study has also shown that national assessments of solar and wind energy potential can be improved by improving local climatic data assessments using spatial databases of Central and North Queensland areas.

Sustainable energy solutions for thermal load in buildings - Role of heat pumps, solar thermal, and hydrogen-based cogeneration systems

2021 ◽  
pp. 1-25
Author(s):  
Praveen Cheekatamarla ◽  
Vishaldeep Sharma ◽  
Bo Shen
Keyword(s):  
Energy Efficiency ◽  
Renewable Energy ◽  
Carbon Footprint ◽  
Energy Demand ◽  
Primary Energy ◽  
Heat Pumps ◽  
Total Carbon ◽  
Coefficient Of Performance ◽  
Renewable Energy Resources ◽  
The Impact

Abstract Economic and population growth is leading to increased energy demand across all sectors – buildings, transportation, and industry. Adoption of new energy consumers such as electric vehicles could further increase this growth. Sensible utilization of clean renewable energy resources is necessary to sustain this growth. Thermal needs in a building pose a significant challenge to the energy infrastructure. Supporting the current and future building thermal energy needs to offset the total electric demand while lowering the carbon footprint and enhancing the grid flexibility is presented in this study. Performance assessment of heat pumps, renewable energy, non-fossil fuel-based cogeneration systems, and their hybrid configurations was conducted. The impact of design configuration, coefficient of performance (COP), electric grid's primary energy efficiency on the key attributes of total carbon footprint, life cycle costs, operational energy savings, and site-specific primary energy efficiency are analyzed and discussed in detail.

scholarly journals Powering a Sustainable and Circular Economy—An Engineering Approach to Estimating Renewable Energy Potentials within Earth System Boundaries

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4723 ◽  
Author(s):  
Harald Desing ◽  
Rolf Widmer ◽  
Didier Beloin-Saint-Pierre ◽  
Roland Hischier ◽  
Patrick Wäger
Keyword(s):  
Renewable Energy ◽  
Energy Demand ◽  
Great Distance ◽  
World Population ◽  
Earth System ◽  
Energy Access ◽  
Renewable Energy Resources ◽  
System Boundaries ◽  
Energy Mix ◽  
Engineering Approach

This study proposes a method to estimate the appropriability of renewable energy resources at the global scale, when Earth system boundaries/needs and the human demand for chemical energy are respected. The method is based on an engineering approach, i.e., uncertainties of parameters and models are considered and potentials calculated with 99 % confidence. We used literature data to test our method and provide initial results for global appropriable technical potentials (ATP) that sum up to 71 TW , which is significantly larger than the current global energy demand. Consequently, there is sufficient renewable energy potentially available to increase energy access for a growing world population as well as for a development towards increasingly closed material cycles within the technosphere. Solar energy collected on the built environment ( 29 % ) and in desert areas ( 69 % ) represent the dominant part of this potential, followed in great distance by hydro ( 0.6 % ), terrestrial heat ( 0.4 % ), wind ( 0.35 % ), and biomass ( 0.2 % ). Furthermore, we propose indicators to evaluate an energy mix on different levels, from an energy mix in single products to the mix used by the global economy, against the estimated RE potentials, which allow an evaluation and consideration in the design of sustainable–circular products and systems.

scholarly journals Legal and Policy Framework for Renewable Energy and Energy Efficiency Development in Vietnam

2020 ◽  
Vol 1 (1) ◽  
pp. 33-47
Author(s):  
Tran Viet Dung
Keyword(s):  
Energy Efficiency ◽  
Renewable Energy ◽  
Energy Demand ◽  
Large Scale ◽  
Negative Impact ◽  
High Energy ◽  
Renewable Energies ◽  
Policy Framework ◽  
Renewable Energy Resources ◽  
Economic Sectors

AbstractVietnam has experienced an economic growth accompanied by increasing energy demand and inadequate supplies. Like most developing countries, the increased inefficient use of energy in Vietnam leads to increased greenhouse gas emissions and high energy costs for consumers. Also, the traditional sources of energy are not sufficient to satisfy the demand of the economic sectors.With the negative impact of climate change on water resources and the depletion of coal, oil and gas reserves, Vietnam must diversify and integrate other forms of renewable energies into its energy mix. The efficient use of renewable energy resources can boost economic development. Thus, the policies for endorsing renewable energies and energy efficiency are playing a vital role in ensuring the sustainable development for Vietnam’s future. This paper examines the legal and policy framework influencing the deployment of renewable energies and energy efficiency in Vietnam. The paper also attempts to identify major barriers to a large scale deployment of renewable energies and energy efficiency technologies and offers some possible solutions.

scholarly journals Government Policy to Encourage Customers to Support Development of Renewable Energy in Indonesia – A Proposal.

2019 ◽  
Vol 1 (1) ◽  
pp. 28-31
Author(s):  
Atmonobudi Soebagio ◽  
Bambang Widodo
Keyword(s):  
Renewable Energy ◽  
Energy Demand ◽  
Power Plants ◽  
Power Grids ◽  
Renewable Energy Resources ◽  
Power Meter ◽  
Solar Power Plants ◽  
The Government ◽  
Supply Capacity ◽  
Smart Grid System

Indonesia is blessed with abundant renewable energy resources. Nevertheless, they have only been used to cover about 5% of the total national energy demand.   To optimize their utilization, the government has to make and implement a policy that will encourage PLN costumers to help increase their on-grid power supply capacity. This policy will provide benefits for islands that are already equipped with PLN power grids. This paper uses Solar Power Plants and household costumers as models to calculate potential on-grid power increase which can be contributed by PLN costumers. A two-way power meter is used to replace the currently used one. This model will be applied to the  conventional grid to demonstrate the compatibility that show how it is applicable even without upgrading the conventional grid to become   smart grid system. The result shows that customers can participate significantly through the flow of their excess energy to grid.

Evaluation of the wind conditions for the acquisition of energy from renewable sources on the base of Sosnowiec city

2013 ◽  
Vol 2 (1) ◽  
pp. 75-81
Author(s):  
Sonia Sarapata
Keyword(s):  
Renewable Energy ◽  
Wind Speed ◽  
Positive Impact ◽  
Renewable Energy Sources ◽  
Energy Resource ◽  
Renewable Energy Resources ◽  
Average Wind Speed ◽  
Sustainable Solutions ◽  
Average Wind ◽  
High Volatility

Abstract Inherent in the continuous development of civilization is a constant increase in demand for electricity. The result of this situation could be a threat to cover domestic demand for electricity generated from domestic sources. It is significant therefore, to increase the energy security of the country, as well as to generate a positive impact on the development and dynamics of social and economic processes which is carried by the development of renewable energy sources. A crucial argument for the need to implement new sustainable solutions is growing environmental degradation and pollution resulting from the acquisition and use of non-renewable energy resources. Renewable energy resource for interest of this analysis is the wind. A crucial feature of the wind is its high volatility. Wind speed is characterized by diurnal, seasonal and long-term variation. The study area is Sosnowiec city. The analysis covers the data from the period 2002 - 2011 obtained using a meteorological station located in the Department of Earth Sciences, University of Silesia in Sosnowiec. Analyzed data are observations of wind speed measured at the height of 10m above the ground - average values of 10 minutes. The mean and maximum daily, monthly and annual values of wind speed have been calculated, and on their basis, a relevant analysis have been made. Average wind speed value for the analyzed area of the analyzed period (2002 - 2011) is 1,70m/s, while the maximum wind speed value is 3,78m/s. Sosnowiec is located in zone IV - unfavorable for the use of wind energy.

Trust in Ultima Thules: Social Capital and Renewable Energy Development in Iceland and Greenland. Part I

2020 ◽  
pp. 182-219
Author(s):  
Aliaksei PATONIA ◽  
Keyword(s):  
Social Capital ◽  
Renewable Energy ◽  
Energy Demand ◽  
Energy Development ◽  
Cultural Factors ◽  
Renewable Energy Resources ◽  
Renewable Power ◽  
Renewable Energy Development ◽  
The Difference ◽  
Energy Strategies

Iceland — an independent republic — and Greenland — an autonomous country within Denmark — represent two nations with similar geographical, economic, and historical backgrounds. Isolated from the continents, both are significantly affected by an adverse climate, making their economies dependent on trade and import. Nevertheless, despite their similarities, their national energy patterns differ substantially. Specifically, Iceland covers most of its energy mix with local renewables, whereas Greenland meets most of the energy demand with imported hydrocarbons. This paper investigates the reasons for Greenland lagging behind Iceland in terms of developing renewable energy resources. It hypothesises that, apart from the commonly-mentioned geographical, institutional, and cultural factors, the difference in social capital level has significantly contributed to the countries’ divergent energy strategies. In this sense, Iceland’s higher social capital stock stimulates its renewable power progress, whereas Greenland’s lower social capital level hampers it. To examine this hypothesis, the article constructs a ‘social capital tripod’, which assumes specific geographical, institutional, and cultural factors to be linked to renewable energy development through social capital. The findings demonstrate that Greenland, being dependent on hydrocarbon import, has a significantly lower expected level of social capital than Iceland, which runs mostly on renewables, therefore generally aligning with the research hypothesis.

Transportation Algorithm for Optimizing Renewable Energy Resources Utilization at Rural Areas

2014 ◽  
Vol 699 ◽  
pp. 853-857 ◽  
Author(s):  
Abraham Debebe Woldeyohannes ◽  
Dereje Engida Woldemichael ◽  
Lim Chye Ing ◽  
Eng Ze Ru
Keyword(s):  
Renewable Energy ◽  
Rural Area ◽  
Rural Areas ◽  
Energy Demand ◽  
Research Area ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Viable Option ◽  
Transportation Model ◽  
Decision Making Tool

This paper aims to address the issues related to renewable energy (RE) resources optimization at rural areas. A transportation algorithm is proposed in order to optimize the utilization of renewable energy and allocate various renewable energy resources to different demand stations. A rural area in Sarawak, Malaysia is selected as a pilot area for implementing the proposed method. The total annual energy demand for the pilot research area is 860,567.12 kWh, while the annual renewable energy potentially available is 879,419.48 kWh. The simulation results of this transportation model reflect that although there is a potential for solar and wind energy at the selected rural area, the model has selected hydropower and biomass as a more viable option. The results obtained from the proposed transportation model have been verified with the results of other RE studies. It is proven that the developed model could be used as a decision making tool to evaluate application of various alternative renewable energy resources and to determine the optimal location for development of these resources.

Environmental and economic evaluation of solar panel wastes recycling

2019 ◽  
Vol 37 (4) ◽  
pp. 412-418 ◽  
Author(s):  
Çağdaş Gönen ◽  
Elif Kaplanoğlu
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Energy Demand ◽  
Economic Value ◽  
Environmental Benefits ◽  
Energy Resources ◽  
Photovoltaic Module ◽  
Renewable Energy Resources ◽  
Photovoltaic Modules ◽  
A Chain

Owing to rising population and increasing energy demand, renewable energy resources become the most convenient and promising solution. Hence, solar power plant investments and photovoltaic module numbers have risen sharply. Turkey is one of the tight followers of the energy trends, thanks to its rising energy demand and economic power. However, the consequences of the massive plant wastes importance in term of economically and environmentally have not been understood yet. Almost 70% of the modules are formed by glass and the rest accumulates economically valuable metal materials, which are silver, aluminium and copper. These three main materials are substantially important in the overall waste. Not only the economic value, but also the environmental impacts of the mining effluents to excavate these metals are causing emission problems. As a chain reaction, the higher energy demand triggers a search for new and renewable energy resources. This is why popularity of solar energy has increased. Solar energy can be absorbed and transformed through photovoltaic modules, which contain glass and three main metals. In order to respond for the production of modules, metals are fundamental. This need triggers the need of metals mining excavations and emissions. In this respect, in the near future, thanks to the rising investments on photovoltaic modules and the CO2 emissions coming from mining, the wastes of photovoltaic modules and the need of recycling will become more important. That is why, in this study it is aimed to present environmental benefits and economic recoveries of recycling photovoltaic module in Turkey.

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