Transactions on Energy Systems and Engineering Applications

Influence of window design and environmental variables on the window opening behavior of occupants and energy consumption in residential buildings

Sivapriya Chelliah, Subbaiyan Gnanasambandam, Srinivas Tadepalli — Thu, 06 Feb 2025 00:00:00 +0000

Building energy use, thermal comfort, natural ventilation, and indoor air quality are influenced by the occupant behavior related to the opening and closing of windows in residential buildings. Studies about window opening and closing behaviour focused mainly on environmental variables (indoor temperature and air quality, climatic factors) and contextual parameters (season, time of the day). This paper investigates the influence of factors related to window design and environmental variables on the frequency of opening and closing the windows and the duration of windows in the open position. The impact of window opening behavior on residential energy consumption is also explored in this study. Data related to window characteristics, ease of operation, hours of windows in open/closed state, and frequency of opening and closing the windows are collected through a questionnaire survey from 365 residences. Energy consumption data is obtained from utility bills and weather data from the meteorological department. Among 365 residences, window opening and closing behaviour were monitored in three residences with loggers for a year to validate the data collected through the questionnaire survey. This study reiterated the influence of environmental variables on the windows’ open duration and the frequency of opening and closing the windows. The results reveal that the window characteristics influence the windows’ open duration and the frequency of opening and closing the windows. The study divulged that energy consumption is influenced by the hours the window is in an open state and the frequency of opening and closing the windows.

An evaluation on industrial applications using leakage inductance and series capacitance converter

Mon, 10 Feb 2025 00:00:00 +0000

The Leakage Inductance and Series Capacitance (LLSC) resonant converters are exhaustively employed in a wide assortment of industries involving consumer electronics due to their benefits of good efficiency, higher power density, immunity to electromagnetic interference, low EMI and harmonic distortion, wide production extends, voltage stress is lowered and frequency at high operating characteristic. Three of the most prominent converters with LLSC topologies are explored along with thorough analyses of their merits and disadvantages. The background of LLSC resonant converters are also discussed. A significant amount of research is also being done regarding large - scale production of LLSC resonant converters, namely in order to charge electric automobiles (EVs), solar systems, LED lighting drivers, and power supply for LCD TVs. Eventually, the growth of LLSC resonant converter is explained.

Design optimization and analysis of switched reluctance motor using genetic algorithm optimization technique

Amit N. Patel — Wed, 26 Feb 2025 00:00:00 +0000

This paper presents efficiency optimization of switched reluctance motor based on genetic algorithm optimization technique. Switched reluctance motor (SRM) is considered for various applications due to its simple and robust construction. It is very essential to improve efficiency of switched reluctance motor. In this paper, optimization of 8/6 switched reluctance motor is achieved by using genetic algorithm with efficiency as its objective function. The objective of the paper is to identify the best switched reluctance motor design that provides better efficiency to satisfy the unique requirements of various applications. Using finite element analysis, a design validation of motor and characterization was made. It is analyzed that analytical results and simulation results are very close which establishes correctness of designs. The optimization result shows that the newly developed SRM design achieved better efficiency. The efficiency is increased from 82.75 % to 86.19 % with minor increase in weight. Improvement in efficiency can lead to lower energy usage, longer motor life span, and better performance.

Investigations and power quality improvement of optimally located large scale RES integrated with conventional distribution system with custom power devices

Tanvi Upadhyay, Jitendra Jamnani — Wed, 14 May 2025 00:00:00 +0000

Non-conventional energy sources are gaining popularity since they have no carbon footprint. As the world's population rises and technology advances, so does the need for power. A conventional grid is combined with renewable energy sources (RES) to supply this need. This link compromises the electrical grid's capacity to run safely and securely despite its benefits. Concerns about system power quality are the most prominent difficulty since they directly influence consumer devices and grid system performance. This article examines the power quality issues and associated worldwide standards for a conventional power network. This article presents simulated examinations of the impact of Photovoltaic (PV) and Wind Energy Conversion System (WECS) on the power quality of the Distribution System using the Modified IEEE 33 Node Radial Distribution Test System. This inquiry considers power quality concerns such as voltage fluctuations, voltage magnitude changes, and system harmonics. The Particle Swarm Optimisation (PSO) approach is used to find the ideal position for the PV system. The D-STATCOM is used to improve the system's voltage profile and harmonics. For simulational analysis, the MATLAB/Simulink software environment is employed.

Gasification of Lenga (Nothofagus pumilio) chips in a fixed bed system for rural area implementation: Magallanes case study

Arnaldo Verdeza, Humberto Vidal, Yuhan Lenis, Antonio Bula — Thu, 24 Apr 2025 00:00:00 +0000

This research explores the gasification of Lenga wood chips (Nothofagus pumilio) sourced from forest remnants within a fixed-bed gasification system with a 10 kWe capacity. The primary focus is on its potential application in remote rural regions. Utilizing a factorial analysis approach, we examine the influence of particle size (ranging from 3–8 mm to 8–20 mm) and the frequency of bed agitation (occurring every 2, 4, and 6 minutes) on critical performance indicators. Throughout the experimentation, the equivalence ratio (ER) remains constant within the range of 0.17–0.20. Cold efficiency demonstrates variability, spanning from 44.8% to 58.8%. Meanwhile, the High Heating Value (HHV) varies between 6.07 and 7.18 MJ/Nm³, with gasification temperatures fluctuating between 850 and 900 °C. The introduction of bed agitation, whether at high or low frequencies, has a notable impact on gas flow, leading to substantial deviations. Larger particle sizes tend to enhance gas flow and process stability but simultaneously have adverse effects on HHV, ER, and overall process efficiency. During transient analysis, it becomes evident that gas flow requires a prolonged duration to achieve stabilization. Frequent agitation cycles (at a rate of 1/140 s⁻¹) result in fewer deviations but a slower stabilization process, whereas less frequent agitation (1/380 s⁻¹) induces greater variations but accelerates the stabilization phase. This comprehensive investigation offers valuable insights into the optimization of Lenga wood chip gasification, particularly for addressing energy needs in rural areas by harnessing forest residues.

Development of an accessible system to enhance driving instruction for individuals with hearing impairments

Diana Peralta, Giovanni Caicedo, Adolfo Duarte Rueda — Thu, 24 Apr 2025 00:00:00 +0000

This development took place within the framework of Resolution 20223040030355 from the Ministry of Transportation of Colombia, which states that individuals with hearing disabilities have the right to obtain driver’s licenses. Consequently, driving schools must adapt their methodologies to facilitate the participation of these individuals in classes. With the aim of improving these processes for deaf individuals during practical driving lessons, a prototype was created. This prototype incorporates an algorithm to process voice commands and route them to a speech recognition model called VOSK, along with a graphical interface implemented in Python using the PyQt5 library. Tests were conducted during practical sessions in vehicles at a driving school in the city, and a socialization session with members of an association of individuals with hearing disabilities resulted in mostly positive outcomes. The project’s approach introduces innovative methodologies compared to those used in other countries, contributing to educational and inclusive advancement through technology.

Revolutionizing logistics: the road to electrifying goods transport vehicles in India

Ganesh Sankaran — Mon, 24 Feb 2025 00:00:00 +0000

The electrification of goods transport vehicles has emerged as a crucial solution for the environmental and economic issues associated with traditional transportation systems. Progress in battery technology has significantly improved the feasibility of electrifying goods transport vehicles. Nonetheless, there are notable challenges that need to be addressed, including limited charging infrastructure, limited range, and high upfront costs, which serve as significant barriers to widespread electrification adoption in India. This paper provides a comprehensive overview of the status of electrification in goods transport vehicles, emphasizing the environmental benefits, technological advancements, existing challenges, and possible solutions in the Indian Heavy Commercial Vehicle (HCV) segment.

Triboelectric nanogenerator to harness energy from low-frequency and low-amplitude vibrating sources

Om Prakash Prabhakar, Dhananjay Sahu, Raj Kumar Sahu — Tue, 04 Mar 2025 00:00:00 +0000

Dielectric Elastomer Generator (DEG) stands out as a promising electromechanical device to harness energy from non-conventional sources owing to its ability to convert mechanical energy into electrical power. DEG with no rotating part demonstrates a high performance-to-weight ratio with ease in fabrication and compactness that sets it apart from traditional energy harvesting techniques. Triboelectric nanogenerators (TENGs) belong to a self-powered class of DEG that capitalizes on low-frequency and amplitude mechanical sources. Existing models for predicting the performance of TENGs often assume parameters such as frequency, amplitude, and relative permittivity are constant. However, these parameters can vary depending on the specific application. In this study, a modified model is proposed to comprehensively investigate the performance of TENG in real-world conditions considering fluctuations in frequency, amplitude, and varying relative permittivity of elastomer layers. Results indicate that at a higher frequency of 55 Hz, there is a significant increase in output voltage, attributed to the higher energy release rate due to increased velocity. The study also emphasizes the role of the relative permittivity of TENG layers, revealing that elastomer layers with higher dielectric constants generate more voltage and power (151\%) compared to those with lower values, particularly at a separation distance of 0.1mm. The findings of this study exhibit notable concurrence with previously reported values and offer a valuable framework for researchers seeking to tailor energy generators for enhanced performance and precision for harnessing energy from low-frequency and low-amplitude sources.

Surface wettability analysis using a microdroplet: a numerical approach

Ganesh Meshram, Gloria Biswal, Ashish Khelkar — Mon, 10 Mar 2025 00:00:00 +0000

Analysis of hydrophobicity is essential for learning about the characteristics of molecules, surfaces, and materials that reject water. Using a two-dimensional (2D) pseudo-potential multiphase lattice Boltzmann approach with a D2Q9 model, this work examines the influence of solid-fluid interaction strength on wettability and hydrophobicity of smooth surfaces. To ascertain the contact angle and assess the accuracy of the numerical model, the study considers the equilibrium state of a water droplet on a smooth surface. In a 200×200 lattice unit domain, droplets having a radius of 60 lattice units are used to assess the hydrophobicity of smooth surfaces. According to the research, there is a large rise in the contact area between solid walls and water droplets when the solid-fluid interaction parameter is raised, which leads to a greater degree of hydrophobicity. By measuring the contact angle between the solid and fluid-vapor interface for different surfaces, it is observed that as G_ads becomes more negative, the contact angle decreases, indicating increased surface hydrophobicity, and the effect on droplet spreading is also highlighted in the research.

An adaptive energy monitoring system for a hybrid power plant using renewable energy

Girija Sankar Panigrahi Girija, Anjan Kumar Sahoo Anjan — Fri, 14 Mar 2025 00:00:00 +0000

Classical power plants powered by fossil fuels produce significant amounts of Greenhouse and toxic gases, together with additional environmentally harmful contaminants. Consequently, the greatest solution for the current issue is a power plant based on renewable resources. Researchers strongly advocate hybrid power plants (HPP) since environmental factors affect the affordability of renewable energy sources of a specific place as well as the time of availability. The present study emphasizes on developing an inventive model for a hybrid system using batteries, solar and wind energy that regulates the power generation as well as distribution according to the affordability of clean energy sources which satisfies load demand, charges or discharges the battery, and injects or utilizes grid power and/or electricity. The MALTAB/Simulink platform has been used to model and simulate the suggested hybrid power station and the EMS.

A case study of the energy performance of A-J hostel block in IIM, Bangalore

Kirti Nikam, Akash KB — Wed, 02 Apr 2025 00:00:00 +0000

Hostel accommodations are vital to urban landscapes, serving diverse occupants like students and travelers. With rising energy demands and environmental concerns, enhancing the energy performance of hostels is increasingly essential. This research focuses on hostel buildings in Bangalore, India, a city known for its technological and educational excellence. Using advanced computational analysis and simulation tools such as Autodesk 2024 Revit and Insight, the study evaluates current energy consumption patterns and proposes optimization strategies. Detailed digital models of selected hostels are developed to examine factors influencing energy efficiency, including architectural design, insulation quality, and HVAC systems. The findings offer insights for hostel stakeholders in Bangalore and beyond, providing a framework for better energy efficiency and sustainability. Strategies encompass passive design principles and renewable energy integration. A case study of an IIM Bangalore hostel block demonstrates potential energy savings and cost reductions through these measures. The paper emphasizes that by adopting energy-efficient practices, hostels can significantly contribute to a greener urban environment.

Study on an indirect solar dryer for drying sliced bitter gourd using PCM

M.K. Murthi, P. Manoj Kumar, Sunil Kumar Bandili, Pradeep Johnson, M. Sakthivel — Wed, 14 May 2025 00:00:00 +0000

Solar dryers are of significant importance in the food industry since they facilitate the preservation of various edible products, including cereals, vegetables, and fish, by effectively extracting moisture from products. In the current study, an indirect type cabinet solar dryer had been constructed to dry the bitter gourd pieces. To enhance the efficacy of the solar dryer during late evening hours, an inorganic salt, sodium thiosulfate pentahydrate (Na₂S₂O₃. 5H₂O) serving as a phase changing material (PCM), was incorporated into the collecting area of the dryer. The study examined the process parameters, including the moisture ratio, dryer inlet temperature and the outlet temperature, for the dehydration of sliced bitter gourds in two scenarios: an indirect solar dryer without phase change material (IDSD), and a solar dryer with PCM (IDSD-PCM). The experiment involved maintaining a constant mass flow rate of air at 0.07 kg/s, while operating the dryer for a duration of nine hours in an experimental day. The findings obtained were evaluated, and the impact of incorporating PCM into the indirect solar dryer was examined and reported. The findings of the study indicated that the inclusion of PCM inside the collecting area had a substantial impact on the temperature of the drying chamber, particularly during the late evening hours. Furthermore, the utilization of PCM resulted in a notable increase of 5.1% per day in the proportion of moisture extracted from sliced bitter gourds.

Identifying disruptive innovation in the IT sector: a framework for evaluating intercompany impact

Hossein Rouhani Zeidanloo, Miroslav Špaček — Mon, 28 Apr 2025 00:00:00 +0000

In the dynamic Information Technology (IT) sector, accurately assessing disruptive potential is crucial for companies aiming to maintain competitive advantages and preempt emerging threats. This study introduces a robust framework for evaluating the disruptive potential of IT companies, with a specific focus on company-to-company impacts. Our approach diverges from traditional models by integrating a holistic, multi-dimensional perspective that includes business model innovation, market dynamics, network effects, and customer adoption trends. Our approach incorporates a situational model that contextualizes disruptive dynamics within specific industry conditions, alongside a scoring model that systematically quantifies the potential impact of innovations. The framework was developed through an extensive literature review, expert interviews, and an analysis of both historical and contemporary case studies. Specifically, the historical case study examines Apple's disruption of Nokia in the smartphone market, while the contemporary case study analyzes the competitive dynamics between Mondoo and Lacework in the cybersecurity domain. These case studies provide an in-depth application of the framework, demonstrating its utility in both retrospective analysis and real-time market evaluation. This development process was significantly enriched by the primary author’s direct industry experience in a Silicon Valley cybersecurity startup, ensuring that the framework addresses real-world complexities and needs. Our research contributes a practical tool adapted to the IT sector's unique characteristics, offering strategic insights for IT professionals, strategists, and policymakers to effectively navigate and leverage disruption opportunities. The practical applications of this framework extend beyond academic discussion, providing actionable guidance for identifying and addressing potential disruptions in the IT landscape.

Business intelligence for decision-making in royalties project management

Sat, 03 May 2025 00:00:00 +0000

This article highlights the critical role of specialized digital tools in enhancing project management and monitoring in Colombia's public sector, it showcases how Microsoft Office 365 and Power Platform have been effectively utilized to optimize royalty-funded initiatives, automating processes and improving decision-making through advanced data análisis. These tools enable process optimization, task automation, and enhanced data analysis, significantly improving the administration of resources and facilitating timely, well-informed decision-making. The methodology is quantitative and complementary information is taken from the technical and legal opinions of the participating professionals. For its execution, a combined approach had to be followed: a PMBOK methodology that gave a clear roadmap and an agile SCRUM methodology capable of highly prioritizing schedule management to provide effective results. In this process, the tools used are Power BI, Power Apps, and Power Automate; these are used to automate tasks and improve operational efficiency by addressing specific issues and contributing to project management and project optimization. Through this project, a proper technological infrastructure has been built for senior management strategic management, planning team tactical management, and operative monitoring to implement BI systems successfully. The project is structured in several phases: initial preparation and planning; implementation; and personnel training, emphasizing continuous training and personnel adaptation to manage resistance to change. Implementing BI and digital tools facilitates teams to work closely together, with noticeable improvements in coordination and operational efficiency. This paper deals with the optimization of monitoring project management of the SGR in the Office of the Attorney General of the Nation, and this experience seeks to be an example to other entities and to inspire them to walk these paths toward a culture of innovation and permanent improvement within the public sector in Colombia. These Microsoft tools are available to most national public servants and contractors, so generating the solution does not imply additional costs. The experience is well documented in the present work and provides a replicable model that can adapt to multiple contexts, promoting greater efficacy and efficiency in public administration.

Agile methodologies for the digital transformation of a Colombian telecommunications company

Wed, 07 May 2025 00:00:00 +0000

Contemporary business dynamics drive the adoption of agile methodologies as an effective response to rapid market evolution and the need for organizational adaptability. However, implementing traditional environments faces significant challenges, especially for companies rooted in traditional practices, such as telecommunications companies in Colombia. This research project is dedicated to implementing agile methods, specifically Objectives and Key Results (OKR), in a traditional organizational context. It is recognized that challenges arise when attempting to integrate these approaches into organizational contexts that maintain practices rooted in tradition, which hinders the cultural change necessary to achieve the entity's strategic objectives. Presumably, successful implementation of OKRs must facilitate deep cultural transformation, achieve effective alignment with strategic objectives, and proactively address internal objections through engagement and communication strategies. For this purpose, we designed a methodology to implement agility in the technical transformation of a company in the TELCO sector in Colombia, considering the challenges it proposes and seeking to address them methodologically.