Rakhimov Ergashali Yuldashevich

Scopus Publications

Determining the level of cloud cover using the sky imager
Ergashali Rakhimov, Abdumannob Imyaminov, Bakhrom Omonov, Fozilbek Jamoldinov
Aip Conference Proceedings, 2025
Methodology for calculating heat loss through triple-layer transparent building enclosures
Nilufar Avezova, Ergashali Rakhimov, Makhliyoxon Dekhkonova, Nargiza Dalmuradova, Akmal Vokhidov, Shokhsanam Yuldasheva
Aip Conference Proceedings, 2025
A holistic approach to understanding the impact of battery energy storage systems on the levelized cost of energy of photovoltaic systems
Asliddin Komilov, Ergashali Rakhimov, Bahtiyor Eshchanov, Yusuf Nasrullayev, Shohjahon Davronov, Kangping Li
Journal of Energy Storage, 2025
Evaluation of Wind Energy Potential of Uzbekistan. Part I: Gross Potential Assessment
E.Yu. Rakhimov, N.R. Avezova, F.Z. Jamoldinov, Samad Emamgholizadeh, M. Ziaii
Renewable Energy Research and Applications, 2025
This study analyzes wind speeds across various regions of the Republic of Uzbekistan to assess wind potential at 10 meters above ground level. Utilizing meteorological data from 77 ground-based stations collected between 2000 and 2022 at three-hour intervals, wind power densities were calculated to evaluate wind potential, with average wind speeds determined monthly and annually. Data analysis from 13 regions identified locations with high wind energy potential, computing wind power densities and Weibull distribution parameters for wind speeds. Maps of average annual wind speed and power distribution, along with wind rose diagrams, illustrated predominant wind directions essential for optimal wind turbine placement. The highest average wind speeds were recorded in the Republic of Karakalpakstan, Navoi, Bukhara, Dehkanabad district (Kashkadarya), and Bekabad city (Tashkent region). Notable wind potential was found in Jaslyk district (Karakalpakstan) at 202.01 W/m², Navoi city (94.05 W/m²), and Dehkanabad district (85.33 W/m²). These results suggest that regions with high wind potential offer significant opportunities for efficient wind energy use. A comparison with previous studies on Uzbekistan's wind potential confirmed the accuracy and reliability of the data, indicating a high degree of consistency. This information can guide optimal planning and strategic placement of wind energy installations, furthering the development of “green energy” and enhancing Uzbekistan’s energy security
Energy-Efficient Windows for Passive Buildings
N. R. Avezova, K. A. Samiev, A. M. Mirzabaev, E. Yu. Rakhimov, M. Kh. Dekhkonova, N. N. Dalmuradova, A. U. Vokhidov
Applied Solar Energy English Translation of Geliotekhnika, 2025
Abstract We presented scientific, methodological, and engineering approaches to the application of energy-active window units in the construction of passive houses, taking into account the climatic conditions of the Republic of Uzbekistan’s regions, which significantly enhance the energy efficiency of buildings. We examined international regulations governing the use of passive strategies and based on these, proposed boundary conditions for the parameters and indicators of energy-active window units to ensure their compliance with current standards. A critical analysis of the designs of energy-active window units was conducted, with a proposed classification based on functional purpose, frame material, construction type, tranclucent-filler type, number and arrangement of sealing contours, as well as sash design solutions and operational characteristics. We also evaluated the maximum and minimum outdoor temperatures by month for the period from 2000 to 2023 and developed temperature distribution maps across the regions of the republic. These maps serve as a basis for analyzing seasonal fluctuations and for developing window systems that provide effective insulation and reduce heat loss during cold periods. In light of the increasing number of days with extremely high temperatures, an analysis of data on the average number of hours with temperatures above 35°C was conducted. This provides a comprehensive understanding of the temperature conditions affecting the thermal load on buildings in the republic and serves as a foundation for developing effective energy-saving solutions. A new design of energy-active window units with a triple-glazed transparent enclosure and a heat transfer coefficient reduced to 0.5 W/(m2 K) is proposed, which improves thermal efficiency by 30–50%, utilizing an air layer and L-shaped brackets to simplify operation and enhance insulation properties and efficiency in various climatic conditions.
Assessment of the Technical Potential of PV Stations on the Example of the Fergana Valley. Part II: Analysis of Sunny, Partly Cloudy and Cloudy Days
E. Yu. Rakhimov, N. R. Avezova, Samad Emamgholizadeh, Mansour Ziaii
Applied Solar Energy English Translation of Geliotekhnika, 2024
Abstract The second part of the research presents an analysis of daily average data on cloudiness (cloud cover) in the Fergana Valley based on an 8-point scale for the period of 2000–2022. The main focus is on the number of clear, partly cloudy and cloudy days, as well as the number of days without sun. It was revealed that the largest number of clear days per year was recorded at the Boz weather station (168 days), while the smallest was in Fergana (112 days). As for partly cloudy days, the maximum number was recorded at Yubileinaya weather station (81 days). The maximum number of cloudy days was observed at the Fergana weather station (186 days). Based on the results and the annual dynamics of clear days, the locations in the region of Boz and Kokand weather stations appear to be the most suitable for installing solar power plants due to their potential for the efficient use of sunlight. Also, despite of the summer potential, in winter the number of clear days decreases, which can affect the performance of solar power plants. This is especially true for the Fergana weather station, where the number of cloudy days in December and January can reach 23. On average, the Andijan, Boz, Yubileinaya, Pap, Kokand and Kuva weather stations, observe 3–4 consecutive days without sun per year. At the Fergana weather station, this value is 4–6 days. The obtained results may be useful for the further sun energetic development in this region.
Retracted:Battery technologies: Exploring different types of batteries for energy storage
Ergashali Rakhimov, Diyorbek Khoshimov, Shuxrat Sultonov, Fozilbek Jamoldinov, Abdumannob Imyaminov, Bahrom Omonov
Bio Web of Conferences, 2024
Battery technologies play a crucial role in energy storage for a wide range of applications, including portable electronics, electric vehicles, and renewable energy systems. This comprehensive article examines and compares various types of batteries used for energy storage, such as lithium-ion batteries, lead-acid batteries, flow batteries, and sodium-ion batteries. Detailed discussions on their characteristics, advantages, limitations, recent advancements, and key performance metrics provide valuable insights into the selection and implementation of these battery technologies for diverse energy storage needs. The article also includes a comparative analysis with concrete numbers and tables, showcasing energy density, cycle life, self-discharge rates, temperature sensitivity, and cost. By exploring the latest literature and research in battery technologies, this article aims to provide stakeholders with up-to-date information for making informed decisions regarding the adoption of battery technologies in energy storage systems.
Retraction: Battery technologies: Exploring different types of batteries for energy storage (BIO Web of Conferences (2024) 84 (05034) DOI: 10.1051/bioconf/20248405034)
Ergashali Rakhimov, Diyorbek Khoshimov, Shuxrat Sultonov, Fozilbek Jamoldinov, Abdumannob Imyaminov, Bahrom Omonov
Bio Web of Conferences, 2024
Battery technologies play a crucial role in energy storage for a wide range of applications, including portable electronics, electric vehicles, and renewable energy systems. This comprehensive article examines and compares various types of batteries used for energy storage, such as lithium-ion batteries, lead-acid batteries, flow batteries, and sodium-ion batteries. Detailed discussions on their characteristics, advantages, limitations, recent advancements, and key performance metrics provide valuable insights into the selection and implementation of these battery technologies for diverse energy storage needs. The article also includes a comparative analysis with concrete numbers and tables, showcasing energy density, cycle life, self-discharge rates, temperature sensitivity, and cost. By exploring the latest literature and research in battery technologies, this article aims to provide stakeholders with up-to-date information for making informed decisions regarding the adoption of battery technologies in energy storage systems.
Corrugated non-stationary optical fiber
T. Akhmadjanov, E.Yu. Rakhimov
Nanosystems Physics Chemistry Mathematics, 2023
Using numerical methods, we study the fractal properties of the optical paths difference for rays propagating in a model of a homogeneous optical fiber with periodically curved (corrugated) wall and other wall periodically oscillating according to the sine law. Also the angle of entry of the rays into the optical fiber and their coordinates in the exit plane is investigated.
Selection and Justification of Rational Technical Solutions for Power Supply Systems based on Solar Energy
N. R. Avezova, E. Yu. Rakhimov, N. N. Dalmuradova, J. O. Izzatillayev, A. U. Vokhidov, A. B. Tarasenko, I. I. Yuldashev
Applied Solar Energy English Translation of Geliotekhnika, 2022
Abstract This article discusses the issue of choosing the location and capacity of a photovoltaic (PV) plant in a rational way for the power supply of the designed capacity of the planned devices and equipment (office equipment, night/day lighting, and alarm systems) as part of the newly constructed building of the JSCB Uzpromstroybank branch in Nukus, the Republic of Karakalpakstan. Based on the climatic and actinometrical database for the city of Nukus (for the period 2005–2020), the natural and technical potential of renewable energy sources (solar energy) of the region is determined. The average hourly power consumption of the planned part of the facility is determined on the basis of the technical parameters of the installed electrical switchboard for power supply on working days is 48.3 kWh, connection to the network of part of the facility was provided through an 80 kVA battery. According to preliminary calculations, to compensate for this energy consumption, the possibility of installing a PV plant based on a 60.3 kW grid system, using the roof section of the building to the maximum. Six different scenarios of system operation using PV*SOL and PVsyst software products have also been developed, where one of the main criteria for choosing a rational solution is the replacement coefficient of traditional energy resources of at least 30%. From the considered scenarios, the most rational options for improving the reliability and stability of the power supply system of the selected part of the facility are determined, as well as rational indicators of the orientation and angle of inclination of PV panels to the horizon, the payback period, the required number of panels, the maximum reduction of CO2 emissions, and on the basis of these scenarios, the technical, economic, and environmental efficiency of the system are determined.
Assessment of the Technical Potential of Photovoltaic Convertors: The Case of the Fergana Valley Part I: Dynamics of Climate Data Changes in the Region
N. R. Avezova, E. Yu. Rakhimov, S. E. Frid, N. N. Dalmuradova, Sh. A. Muminov
Applied Solar Energy English Translation of Geliotekhnika, 2022
Adjustments to the indicators of the heating and cooling degree-days for regions of the Republic of Uzbekistan
N R Avezova, E Yu Rakhimov, N N Dalmuradova, M B Shermatova
Iop Conference Series Earth and Environmental Science, 2021
A Way to Verify the Actinometric Data of On-Ground and Satellite Observations for the Republic of Uzbekistan
E. Yu. Rakhimov
Applied Solar Energy English Translation of Geliotekhnika, 2021
Resource Indicators of Solar Photovoltaic Plants in the Republic of Uzbekistan. Part 2. Verifying Satellite Actinometric and Reanalysis Data for Conditions in Uzbekistan
N. R. Avezova, S. E. Frid, N. V. Lisitskaya, E. Yu. Rakhimov
Applied Solar Energy English Translation of Geliotekhnika, 2019
Actinometric Data for Flat Receivers Solar Energy Units Performance Estimation
S. E. Frid, E. Yu. Rakhimov, B. B. Boliev
Applied Solar Energy English Translation of Geliotekhnika, 2019
Influence of Ambient Temperature, Wind Speed, Emissivity, and Average Working Temperature of Light-Absorbing Heat-Exchange Panels of Flat-Plate Solar Water-Heating Collectors on Their Thermal Losses Through Translucent Coatings
N. R. Avezova, R. R. Avezov, A. U. Vokhidov, E. Yu. Rakhimov, U. Kh. Gaziev
Applied Solar Energy English Translation of Geliotekhnika, 2019
Influence of Meteorological Factors on the Thermal Loss Coefficient of Light-Absorbing Heat Exchange Panels of Flat-Plate Solar Water Heating Collectors through Transparent Coatings of Their Casings
R. R. Avezov, N. R. Avezova, A. U. Vokhidov, E. Yu. Rakhimov, N. O. Usmonov
Applied Solar Energy English Translation of Geliotekhnika, 2018
Resource Indicators Used for Solar Photovoltaic Plants in Uzbekistan Part 1
N. R. Avezova, E. Yu. Rakhimov, J. O. Izzatillaev
Applied Solar Energy English Translation of Geliotekhnika, 2018
Dependence of Techno-Economic and Ecological Indicators of Flat-Plate Solar Water Heating Collectors in Hot Water Supply Systems from the Temperature of Heating Water
N. R. Avezova, E. Yu. Rakhimov, A. E. Khaitmukhamedov, B. B. Boliev, A. Yu. Usmonov
Applied Solar Energy English Translation of Geliotekhnika, 2018
Determination of the Convective Heat-Exchange Coefficient in Inner Channels of Light-Absorbing Heat-Exchange Panels of Flat-Plate Solar Water-Heating Collectors Based on the Results of Their Short-Term Thermal Testing in Full-Scale Conditions
R. R. Avezov, N. R. Avezova, E. Yu. Rakhimov, A. U. Vokhidov
Applied Solar Energy English Translation of Geliotekhnika, 2018
Orientation of heated premise in the design of insolation passive heating systems
N. R. Avezova, E. Yu. Rakhimov
Applied Solar Energy English Translation of Geliotekhnika, 2017
Calculation of the temperature of the internal surface of the heat-removing channel wall of the ray-absorbing heat-exchange panels of flat-plate solar water-heating collectors
R. R. Avezov, E. Yu. Rakhimov, A. M. Mirzabaev
Applied Solar Energy English Translation of Geliotekhnika, 2017
Analysis of the solar energy potential of the Republic of Uzbekistan
E. Yu. Rakhimov, Sh. E. Sadullaeva, Yu. G. Kolomiets, Kh. K. Tashmatov, N. O. Usmonov
Applied Solar Energy English Translation of Geliotekhnika, 2017
The evaluation of heat capacity and choice of materials for short-term storage of diurnal solar heat surplus in passive solar heating systems
R. R. Avezov, D. U. Abdukhamidov, M. A. Kuralov, E. Yu. Rakhimov, Sh. B. Imomov
Applied Solar Energy English Translation of Geliotekhnika, 2016
Impact of the partial absorption of solar radiation in translucent covers of the flat-plate solar collector housing on the heat losses of their light-absorbing heat-exchange panel into the ambient
N. R. Avezova, A. U. Vokhidov, D. U. Abdukhamidov, E. Yu. Rakhimov
Applied Solar Energy English Translation of Geliotekhnika, 2016

Rakhimov Ergashali Yuldashevich

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Scopus Publications