Use Of Alternative Energy Sources Research Articles

Contribution of Fuel Wood Income from Natural Forests to Household Economy in Delanta District, Northeastern Ethiopia

For Ethiopia’s rural homes, particularly those in the Delanta district, fuelwood is the primary energy source. This suggests that the impact of fuel wood from the forest to family energy use or income is significant. The goal of the current study was to estimate how much annual fuel wood harvested from forests contributes to household consumption and monetary income. 96% of the forest’s income comes from fuelwood. In the study area, it contributes 2,013,539 Birr, or 33%, of all family income. 703,014 ETB, or 23.8% of the total subsistence income, and 1,310,525 ETB, or 40.65% of the total cash income of the tested households, are both covered by fuelwood from the forest. Both socioeconomic and physical characteristics close to the users influenced how dependent a household was on fuelwood income from the forest. The data obtained from randomly selected households by survey method have been subjected to multiple regression analysis and obtained that households’ reliance on fuelwood income from the forest was significantly influenced by factors such as age, educational level, number of trees owned, distance to forest, distance to market, and nonforest income, all of which had a negative and significant impact. The only significant factor that significantly and positively influences reliance on fuelwood income from the forest is the number of family members. Therefore, preserving a natural forest through the use of alternative energy sources, such as electricity, or encouraging a plantation on one’s own property is a potential discipline for mandating climate change prevention.

The role of institutional diversity in sustainable water use: Performance comparison among water user organizations

AbstractThe aim of this study was to compare the performance of water user organizations (WUOs) in the agricultural sector in terms of their managerial efficiency. A survey was carried out across the study area to evaluate 67 WUOs, including irrigation cooperatives, municipalities, village legal entities (VLEs) and water user associations (WUAs). The findings were then used to create a management performance index. It has been determined that municipalities excel in terms of physical performance, irrigation cooperatives in enterprise and social performance and WUAs in institutional and investment performance. The general management performance index revealed that the most successful WUOs in the Konya closed basin were WUAs. Therefore, proposals have been put forward to begin institutionalization processes in other institutions to attain the successful institutionalization in WUAs. Additionally, the shift towards prepaid systems is recommended to mitigate collection problems, while water should be priced according to the full cost method. Finally, supporting the use of alternative energy sources for irrigation is crucial.

Application of alternative sources of energy resources: Economic aspects

The topic of research related to alternative energy sources is relevant, since with the constant growth of the population and the development of industry around the world, the demand for energy continues to increase, at a time when traditional energy sources (coal, oil, and gas) are limited and subject to exhaustion. Alternative energy sources offer new opportunities to meet the growing demand for energy, they can provide more stable prices and reduce dependence on energy imports, and do not emit greenhouse gases or pollute the environment. The purpose of this paper is to study the economic viability and potential of alternative energy sources in order to assess their impact on the economy and identify opportunities and challenges. Among the methods used, the analytical method, the statistical method, the functional method, the system analysis method, the deduction method, the synthesis method and the comparison method were applied. The study analysed financial mechanisms that promote the development of alternative energy sources, such as subsidies, tax incentives and investments in renewable energy sources. The effectiveness of these mechanisms and their impact on the development of the industry was studied. Special attention was paid to the economic risks associated with alternative energy sources, including the instability of prices for equipment and technologies, as well as changes in legislation and regulation. The current state and dynamics of the market for alternative energy sources were analysed, as well as the growth potential and the share of alternative energy sources in the overall energy system were determined. The positive impact of the use of alternative energy sources on the economy and society is assessed. The results obtained are of practical value and can be used to make decisions related to the use of alternative energy sources and improve this process at a new level.

Parameters Affecting the Explosion Characteristics of Hybrid Mixtures Arising from the Use of Alternative Energy Sources

Explosions of hybrid mixtures are an interesting theoretical and experimental problem in explosion sciences, because they combine the physicochemical properties of flammable gases and dusts. A hybrid mixture is composed of at least two substances in two or more states. The influence of the common presence of flammable gas on the explosiveness parameters of the combustible dust itself is proven. In this study, we present the effect of higher initiation temperatures, different initial sources of initiation with different energies, and the effect of the volume of explosion chambers on the explosions of hybrid mixtures arising from the use of alternative energy sources. The experiments were carried out in 20 L and 1.00 m3 explosion chambers (according to EN 14034-1+A1:2011–EN 14034-4+A1:2011). The accredited method of the Energy Research Centre, VSB-TU Ostrava, for tests was used. The goal is to approximate the behaviour of these systems under different initiation conditions so that it is possible to avoid excessively conservative or overly optimistic results, which then affect the determination of explosion parameters for practical use. It was found that the volume of the explosion chambers in combination with the used initiation source has a fundamental influence on the course of the explosion characteristics.

ТЕХНИКО-ЭКОНОМИЧЕСКОЕ ОБОСНОВАНИЕ УСТАНОВКИ СОЛНЕЧНЫХ КОЛЛЕКТОРОВ ДЛЯ ИНДИВИДУАЛЬНЫХ ДОМОВ

The hot water supply system of Perm uses solar energy. The aim of the study was to substantiate the economic efficiency of solar collectors and determine their payback period taking into account climatic conditions, equipment cost and economic criteria. The proposed technical solutions of solar energy using were analyzed and compared with electric heating. During the study, the authors defined the required minimum solar collector area for a household (taking into account the hot water standard for Perm) as a functional dependence of the amount of incoming solar insolation on the amount of using heat energy. We evaluated domestic and imported solar collectors on the required parameters. The value of the reduction in the payment for electric energy was taken as the income for the households. The economic efficiency was calculated based on the forecasted average electricity tariff, taking into account inflation from 2 to 16 %. The payback of a solar hot water heating system depends primarily on the cost of purchase, installation of equipment and on the discount rate. The practical significance is to substantiate the economic efficiency of solar collectors for consumers. The methodology and results of the study can be used in private residential construction and in justification of the use of alternative energy sources for Russian regions with low insolation.

Legal security of the use of alternative energy sources in the field of electricity and heat supply

The article is devoted to the establishment of step-by-step processes of formation and development of legislation in the field of obtaining electricity and heat supply from alternative energy sources, taking into account the trends of legal regulation in the countries of the European Union. A comparative analysis of measures to stimulate renewable energy in Ukraine and the European Union has been carried out. The article indicates objective obstacles to the development of alternative energy sources in the field of electricity and heat supply. Prospects and problems of the development of electricity and heat energy production from renewable sources through the prism current legal regulation are given. The compensation mechanism of the «green fariff», the electiveness of its introduction, the state of influence on the economy as a whole in the state are analyzed. The positions of well-known scientists regarding the state of development of renewable energy in determining the prospects for replacing the use of traditional energy sources in the field of electricity and heat supply are characterized. The reasons for the interest in alternative energy sources are indicated, with the simultaneous presentation of one’s own vision of the positive and negative aspects of the spread of such energy sources. The article examines the current state and prospects for the development of heat supply from alternative energy sources, in particular, from biomass, including the advantages and disadvantages of this resource. The reasoning is given that for the successful implementation of the use of renewable energy sources instead of traditional ones in the field of electricity and heat supply, it is necessary to strengthen the renewal and development of legal support in this direction. Formed, based on the research, the state, potential, trends and prospects of alternative energy and heat supply, developed recommendations for improving the institutional and functional support of this institute. The article contains suggestions for improving the institute for obtaining electricity and thermal energy from alternative sources.

The BREEAM, the LEED and the DGNB certifications as an aspect of sustainable development

Some of the most significant problems of industrialised countries are increasing consumerism, the growing demand for more and more energy and other natural resources, and the depletion of non-renewable sources. The visible consequences are environmental pollution and global warming. To address these issues, there is growing pressure on the use of alternative energy sources, the use of natural resources and the introduction of new technologies. The use of multi-criteria building certification systems, which evaluate their performance, is becoming increasingly common in the building industry. The BREEAM, the LEED, and the DGNB are among the most popular methods for assessing sustainable architecture, and they project management tools. The main task of the article was to define and describe the impact of documents related to sustainable development certificates on contemporary design and living and working conditions, as well as to demonstrate the relationship between the quality of architecture and environmental protection. Another goal is to indicate how dynamically the number of certificates issued in Poland is increasing. The study used the necessary research methods: analysis and criticism of applicable documents and literature, as well as an intuitive method based on personal experience. The scope of the work includes a discussion of the most frequently obtained certificates: the BREEAM, the LEED, and the DGNB, the achievements of which prove the use of solutions conducive to sustainable development.

A systems approach to hazard identification for solar-powered and wave-propelled unmanned surface vehicle

Decarbonization is a trend in the maritime industry and may include the use of alternative energy sources on ships. At the same time, autonomous ships are under development. In the future, the two technologies may be combined. The objective of this study is to identify possible hazards related to the operation of autonomous vessels using green energy sources. An extended and holistic Systems-Theoretic Process Analysis (STPA) based approach is proposed, where both safety and security is considered. Changes in level of autonomy during operation are considered, and an extension of the STPA method is proposed to highlight the interaction between the system and external energy source. A solar-powered and wave-propelled unmanned surface vehicle is analysed. The results show that mission performance may be affected by both safety and security issues, and that considering influences from the environment and the autonomous functionalities of the system together, contributes to identifying hazards. The results are compared to operational experience from multiple field campaigns. The case study focuses on a relatively simple autonomous vehicle, but some functionalities may be shared with Maritime Autonomous Surface Ships (MASS). Hence, implications for utilisation of alternative energy sources on MASS, and effects on risks, are discussed.

Realizing Low-carbon and Climate-resilient Development on Aquaculture

Aquaculture production supports food security, and it is an important commodity for Indonesia's exports. Climate change determines the sustainability of aquaculture production. Low-carbon development is an effort to control the impact of climate change from a mitigation standpoint, while climate-resilience development is an adaptation. In order to realize sustainable aquaculture in a broad and long dimension and in line with the Sustainable Development Goals (SDGs), it is necessary to develop a low-carbon and climate-resilience development strategy. A descriptive analysis was carried out on a review of published literature to develop the concept of low-carbon and climate-resilience development in aquaculture. The keywords used in the literature search are the impact of climate change on aquaculture, low-carbon development, climate-resilience development, and achievement of the SDGs in aquaculture. The research that has been published mostly discusses the potential Green House Gas emissions (GHG) from aquaculture activities, is still very limited and explains efforts to mitigate and adapt aquaculture to climate change. Efficiency and use of alternative energy sources, increased productivity, feed efficiency and effectiveness, effluent management, disease control and water quality management, and superior seeds can be applied in low-carbon emission development. Meanwhile, climate-resilience development that can be implemented includes the implementation of Integrated Multi-Tropical Aquaculture (IMTA) and Regional Integrated Multi-Tropical Aquaculture (RIMTA), closed systems, and Recirculating Aquaculture Systems (RAS), as well as ponds that integrate mangroves.

Scenario Analysis of the Prospects for the Use of Alternative Fuels for Road Transport in Russia

The article examines the economic and environmental consequences for the Russian Federation that may be caused by the transition of road transport to natural gas fuel and electricity. According to strategic planning documents, public authorities are pursuing the policy aimed at converting a significant share of road transport to natural gas fuel. As singled out, this policy is mainly motivated by the issues of limiting emissions of harmful substances into the atmosphere from the combustion of oil products. In addition to a positive impact on the environment, this transformation should have a positive impact on the economy, since the use of alternative energy sources reduces transport costs, and construction of the necessary related infrastructure will create additional growth points for the economy.The objective of the study described in the article is to investigate the economic and environmental effects for the Russian Federation from the transfer of road transport to natural gas fuel.Main economic indicators analysed comprise subsidies that are necessary to create conditions for development of the relevant market, changes in budget revenues from the mineral extraction tax and excise duty on oil products, as well as additional gross value added due to multiplier effects in the economy. The study of environmental effects consists in assessing the reduction of emissions of greenhouse gases and particulate matter into the atmosphere.The analysis of the effects for the Russian economy from the transfer of road transport to alternative energy sources has shown that due to the multiplier effect, for the period up to 2035, gross value added will increase by 3,6 trillion rubles, and investments in the necessary infrastructure will amount to about 2,7 trillion rubles, which is about 13 % of the projected investment in the road sector. Due to the use of gas motor fuel and electric vehicles, by 2035 СО2 (carbon dioxide) emissions will be reduced by 11 million tons annually, which represents only 0,5 % of nationwide emissions. This means that the transfer of road transport to alternative energy sources is not effective enough from the point of view of the existing motivation, and the motivation must be changed in favour of positive economic effects.

Kopátsy’ ideas along the dimensions of the ESG framework

The study examines the forward-thinking and innovative ideas of Sándor Kopátsy that align well with the pillars of the increasingly prevalent ESG (Environmental, Social, Governance) framework, anticipating their time. During the research, document analysis was employed, incorporating not only Kopátsy's already published studies but also, uniquely, the unpublished manuscripts found in the digital archive of the Sándor Kopátsy Knowledge Center, as well. Kopátsy's starting point was his close relationship to nature, asserting that nature does exist for humanity. He claimed, that in a society harmonized with nature, people can be more productive, ethical, and achieve a higher cultural level. It is crutial, thus quality workforce, even without abundant capital or raw materials, can position a country at the forefront, parallel to the conscientious and realistically executed use of alternative energy sources. The research was conducted within the framework of the Kopátsy Research Program 2023 Fall.

ЭМПИРИЧЕСКИЙ АНАЛИЗ ВЛИЯНИЯ ЭКОНОМИЧЕСКОЙ ДЕЯТЕЛЬНОСТИ НА СОСТОЯНИЕ ОКРУЖАЮЩЕЙ СРЕДЫ: ПРИМЕР СТРАН БРИКС

The research is devoted to the nexus between economic development and environmental pollution in the BRICS countries. Within the framework of the study, the hypothesis of the Kuznets environmental curve was not verified, but Russia and China have the greatest potential to reach the income level where economic growth is able to "take care" of the environment. Applying the advanced econometric method of Driscoll–Krayy panel data analysis, we found that GDP per capita growth, industrialization and urbanization are the factors most responsible for environmental degradation in the BRICS countries, while the inflow of foreign direct investment, developed financial sector, active integration into the global space, environmental policy and the use of alternative energy sources contribute to environmental improvement. As for the policy implications, the BRICS countries should direct their efforts to create the most favourable conditions for FDI, deepen the financial sector, intensify environmental policy and develop the alternative energy sector.

Energy aspects of automobile transport development

Problem. Improving automobile transport means increasing fuel economy and environmental indicators. Fuel, in a broad sense, means energy used to activate the car's power plant. Potential energy is dispersed in the earth’s interior, on its surface, in the atmospheric air, and even in space. Moreover, some of them exist in different substances. On the one hand, the efficiency of an energy product use is assessed by its energy intensity; on the other hand, it is evaluated by the costs of its production (transportation) and the quality of its transformation into a consumer type of energy. Special attention is paid to renewable and unlimited kinds of energy sources. Goal. The purpose of the study is a qualitative analysis of the road transport development direction from the standpoint of the alternative energy sources use, taking into account the factors that comprehensively determine the economic and environmental indicators at the stages of production and processing of fossil raw materials, production of power plants and conversion, transformation, and transportation of energy in the field of transport technologies. Methodology. The first direction consists of the adaptation (conversion) of the design of thermal internal combustion engines for alternative liquid or gaseous fuel types. The advantage of this approach is minimal costs for engine conversion and fuel production. The second approach involves using hybrid power plants, consisting of a main and auxiliary engine, an energy source or accumulator, an energy converter, and a braking recuperation system. The third direction is the use of non-traditional energy sources. Results. The directions of the development of power plants for motor vehicles related to the increase in the energy density of hydrocarbon fuels, the use of hybrid power plants, and the use of alternative energy sources have been determined. A qualitative assessment of the considered approaches is given. Originality. A comprehensive approach to evaluating the effectiveness of using alternative types of energy in road transport is considered in terms of energy, economic, and environmental indicators. Practical value. The obtained results can be regarded as recommendations when drawing up plans for the evolution of industries of fossil extraction and transformation of other energy resources, the development of motor vehicles, and transport infrastructure technologies, taking into account the natural and industrial potential of the country

Assessing the impact of charcoal production activities on the Shea Nut tree vegetation cover

Charcoal remains the main energy cooking source for urban dwellers in Uganda. The Shea Nut tree produces quality charcoal which is efficient and locally made. Therefore, it is facing increasing threats from the local communities so as to meet the mushrooming demand. The study analyses the state of the Shea Nut tree, drivers of charcoal production, predict Shea Nut tree vegetation coverage, and establish mechanisms for sustainable utilization and conservation of the Shea Nut trees in Kapelebyong District. Landsat images were classified using likelihood classification in ArcGIS and interviews were conducted whilst geospatial, Stata, and Nvivo tools were used for analysis. The findings reflect a sharp declining trend in the coverage of the shea Nut trees by 2.3% and 6% from 2002-2012 and 2012-2022 respectively. The major drivers include high demand from urban areas, the need for income, and unemployment. As a result, it is predicted that by 2032, the coverage will have reduced to only 713 hectares (7.3%) from 1277 hectares (10.6%) in 2022. Therefore, charcoal production with other land uses has greatly resulted in Shea Nut tree deterioration. The study recommends the use of alternative energy sources, the provision of alternative income-generating activities for the local communities, Government of Uganda through NFA needs to enforce the ways through which Shea Nut trees are managed and utilized in order to minimize illegal cutting.

The impact of urban air pollution on human health

Atmospheric air can be polluted as a result of the ingress of various chemicals into it, which have a harmful effect on human health, causing an exacerbation of cardiovascular, airborne diseases, diseases of the gastrointestinal tract and the endocrine system, and exceeding the norms of dust content in the air leads to an increase in incidence of allergies and bronchial asthma. The relevance of the subject under study lies in the investigation of the sources of air pollution, as they lead to an increase in the degree of morbidity and mortality among the population. This, in turn, requires a radical change in the way people live, as well as the adoption of specific measures to ensure the reduction of air pollution. In this regard, the objective of this study was to perform a comprehensive analysis of the ecological and hygienic conditions of atmospheric air and evaluate its impact on human health due to pollution. The study incorporated empirical research methods such as empirical description and comparison to analyze emissions of pollutants, assess population morbidity rates, and conduct correlation and regression analyses. Official data from the State Committee of Uzbekistan on Statistics and scientific papers were utilized, alongside statistical analysis techniques and logical reasoning to investigate atmospheric air pollution and its impact on public health. The study analysed the indicators of emissions of pollutants into the atmosphere in the Republic of Uzbekistan as a whole and by regions. Furthermore, the paper provides a detailed analysis of the general morbidity of the population of the Republic of Uzbekistan and indicators of the incidence of cardiovascular diseases, based on which a correlation and regression analysis was performed. In addition, the morbidity rates of the population with diseases of the respiratory system and eye diseases throughout the Sirdaryo Region were analysed. The study revealed that Uzbekistan experiences high levels of environmental pollution, with a direct correlation found between atmospheric pollutants and the incidence of cardiovascular diseases, respiratory organ issues, and eye conditions. To protect the atmosphere, reducing pollutant emissions and implementing sustainable development principles, such as industrial modernization and the use of alternative energy sources, are necessary. The results highlight the importance of identifying pollutant types, their properties, and release conditions for effective pollution assessment. The practical significance of this study is to optimize the data of environmental monitoring of urban air pollution in the Republic of Uzbekistan, where in general there is a high level of pollutants in the atmosphere, which affects the health of the population.

ENHANCEMENT OF ENERGY EFFICIENCY AND BIOSPHORE COMPATIBILITY OF BUILDINGS AND STRUCTURES IN UKRAINE

The use of alternative energy sources is one of the most important areas of modern energy policy, aimed both at improving the environment and saving traditional fuel and energy resources. Adopted legislative and regulatory acts contributed to the rapid growth of "green" energy in Ukraine. The meaning of the ecological and energy optimization process is not to replace one energy source with another, but economic and industrial transformation, decarbonization and decentralization. 
 A technical solution to the problem regarding the source of alternative energy due to the use of heat in the surface layers of the earth's crust is proposed. At the depth of placement of probes-heat exchangers, which are structurally part of heat pump installations, the soil temperature is practically unchanged throughout the year and is positive. Non-freezing glycol solutions are used to increase the operational reliability of the installations. 
 To study the process of thermal interaction in the zone of placement of heat exchanger probes, mathematical modeling using the finite element method was applied. As a result, a significant array of data was obtained, which reflects the dynamics of temperature fields in different modes of operation of ground-source heat pump installations with vertical probes. 
 Of particular interest is the analysis of temperature fields along the depth of the well. After the seasonal selection of heat - the end of the heating period - the minimum temperature of the soil in the boundary zone of the geothermal probe is not lower than 0 0С. That is, freezing of soil rocks does not occur. 
 In the warm period of the year, due to, for example, the working air conditioning system of the building, the energy source of which is the heat pump installation, regeneration of the primary circuit takes place. The average temperature of the rocks between the probes at the beginning of August is, according to calculations, 6.5 0С. 
 The obtained results of analytical studies were used in the design of a ground heat pump installation for the energy supply needs of a public building with an estimated thermal capacity of 200 kW.

Human ovarian aging is characterized by oxidative damage and mitochondrial dysfunction.

Are human ovarian aging and the age-related female fertility decline caused by oxidative stress and mitochondrial dysfunction in oocytes? We found oxidative damage in oocytes of advanced maternal age, even at the primordial follicle stage, and confirmed mitochondrial dysfunction in such oocytes, which likely resulted in the use of alternative energy sources. Signs of reactive oxygen species-induced damage and mitochondrial dysfunction have been observed in maturing follicles, and even in early stages of embryogenesis. However, although recent evidence indicates that also primordial follicles have metabolically active mitochondria, it is still often assumed that these follicles avoid oxidative phosphorylation to prevent oxidative damage in dictyate arrested oocytes. Data on the influence of ovarian aging on oocyte metabolism and mitochondrial function are still limited. A set of 39 formalin-fixed and paraffin-embedded ovarian tissue biopsies were divided into different age groups and used for immunofluorescence analysis of oxidative phosphorylation activity and oxidative damage to proteins, lipids, and DNA. Additionally, 150 immature oocytes (90 germinal vesicle oocytes and 60 metaphase I oocytes) and 15 cumulus cell samples were divided into different age groups and used for targeted metabolomics and lipidomics analysis. Ovarian tissues used for immunofluorescence microscopy were collected through PALGA, the nationwide network, and registry of histo- and cytopathology in The Netherlands. Comprehensive metabolomics and lipidomics were performed by liquid-liquid extraction and full-scan mass spectrometry, using oocytes and cumulus cells of women undergoing ICSI treatment based on male or tubal factor infertility, or fertility preservation for non-medical reasons. Immunofluorescence imaging on human ovarian tissue indicated oxidative damage by protein and lipid (per)oxidation already at the primordial follicle stage. Metabolomics and lipidomics analysis of oocytes and cumulus cells in advanced maternal-age groups demonstrated a shift in the glutathione-to-oxiglutathione ratio and depletion of phospholipids. Age-related changes in polar metabolites suggested a decrease in mitochondrial function, as demonstrated by NAD+, purine, and pyrimidine depletion, while glycolysis substrates and glutamine accumulated, with age. Oocytes from women of advanced maternal age appeared to use alternative energy sources like glycolysis and the adenosine salvage pathway, and possibly ATP which showed increased production in cumulus cells. The immature oocytes used in this study were all subjected to ovarian stimulation with high doses of follicle-stimulating hormones, which might have concealed some age-related differences. Further studies on how to improve mitochondrial function, or lower oxidative damage, in oocytes from women of advanced maternal age, for instance by supplementation of NAD+ precursors to promote mitochondrial biogenesis, are warranted. In addition, supplementing the embryo medium of advanced maternal-age embryos with such compounds could be a treatment option worth exploring. The study was funded by the Amsterdam UMC. The authors declare to have no competing interests. N/A.

Using hydrogen energy to improve energy security and ESG transformation

Subject. This article discusses the prospects for the use of alternative energy sources and the problem of reducing greenhouse gas emissions. Objectives. The article aims to assess the potential of hydrogen energy in terms of ensuring economic growth in Russia. Methods. For the study we used the methods of systems, comparative, structural, and logical analyses. Conclusions. In Russia, there are strategic prerequisites for the development of hydrogen energy, and one of them is a large area of territories that are subject to special requirements for environmental friendliness. Alternative energy sources can be used to produce hydrogen, which will reduce the environmental stress.

MANAGEMENT METHOD OF ELECTRICITY GENERATION SYSTEM USING WIRELESS TECHNOLOGIES

The subject of the study is the method of control and monitoring of the electricity generation system. The goal of the work is to investigate and develop a method for controlling the electricity generation system using wireless technologies. Relevance. The issues of energy efficiency and the use of alternative energy sources are relevant and important in modern conditions. In particular, solar energy is one of the most perspective areas in solving these problems. It is necessary to have the ability to monitor and control the generation process for optimal use of solar energy. The developed method should control the power generation system using wireless technologies and have flexible modes of operation. The development of the method of effective search for the point of maximum power and the power generation system in general is one of the most important tasks of the work. The object of the study is the process of control and monitoring of the electricity generation system. Research methods. Solar panel operation methods at maximum power: PWM (Pulse Width Modulation) and MPPT (Maximum Power Point Tracking). Results. The management method for the electricity generation system using wireless technologies is proposed in this work. A solar panel and a generator were chosen for electricity generation. The control of generation and system operation is based on the work of a microcontroller, which, in turn, transmits current data and the ability to control the system to a mobile application via a Wi-Fi module. This method can be used in a "Smart Home" system and other systems aimed at sustainable energy supply for consumers. Conclusion. The developed management method of the electricity generation system is planned to be used in systems of sustainable power supply for consumers. The method can be improved by integrating with other wireless technologies and adding other objects of electricity generation in the future.

Numerical investigation of the effect of rectangular and semicircular cavities filled with phase change materials installed on the solar wall.

The use of alternative energy sources, particularly solar energy, in buildings is rising and spreading around the globe. In this paper, a solar wall is analyzed using a numerical method. On the wall, a number of obstacles are placed in two shapes, rectangular (REC) and semicircular (SEC). The cavities are filled with organic phase-change materials. This study was performed in 7 h in the absence of solar radiation on the wall for different dimensions of obstacles in 5 different modes. Various temperatures have been investigated, including exhaust air temperature (TAR), Trombe wall temperature (TWL), and mean volume % of molten PCM in cavities. COMSOL software is used to carry out this numerical study. The results of this study showed that the use of SECs compared to RECs causes the TWL to be higher. In the most extreme case, at a 16 cm aspect ratio, the use of SECs gives a 2.1 °C increase in TWL relative to the REC one. The outlet TAR is also increased by the usage of SECs. The use of larger dimensions of the cavities has increased the TAR leaving the wall so that the TAR after 7 h of the absence of solar radiation, in the most significant case of SECs, was more than 295.5 K. The use of SECs also increases the PCM freezing time. In the largest case of cavities, using SECs increases the freezing time by 15 min compared to RECs.