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 — 2025-02-06

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

Gundala Srinivasa Rao — 2025-02-10

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 — 2025-02-26

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.

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

Ganesh Sankaran — 2025-02-24

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 — 2025-03-04

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.