Vol. 2 No. 1 (2024)

Open Access

Article

Article ID: 426

Nonlinear controller for SEPIC with single variable to tune

by Youssef El Haj, Vijay Sood, Ahmed Sheir, Ruth Milman

Energy Storage and Conversion, Vol.2, No.1, pp. 2(1); , 2024; 84 Views, 0 Untitled Downloads, 47 PDF Downloads

This work proposes a systematic approach to design a novel integral sliding mode controller (ISMC) for a single-ended primary-inductor converter (SEPIC) with only one tunable parameter where the upper and the lower bounds are derived. The designed surface results in a minimal chattering behaviour at the output voltage as well as at the duty cycle and allows for operating the SEPIC at a fixed switching frequency. The proposed controller can withstand up to a 70% variation in the input voltage and 100% variation on the load side in addition to superior performance for a cold start. The proposed controller and the corresponding mathematical formulation were simulated in a Simulink environment and experimentally tested via a scaled prototype. The proposed controller performance is also compared to a Type-II and integral Linear-Quadratic Regulators (LQR).

Open Access

Article

Article ID: 515

Heat transfer characteristics in Williamson fluid flow in a vertical channel with chemical reaction and entropy production

by Amala Olkha, Mukesh Kumar

Energy Storage and Conversion, Vol.2, No.1, pp. 2(1), 515; , 2024; 32 Views, 17 PDF Downloads

This research endeavor investigates the natural convection flow of Williamson fluid in the region between two vertical parallel flat plates via porous medium. Impacts of viscous dissipation, joule heating, exponential space-and thermal-dependent heat sources (ESHS/THS) are invoked. Mass transfer is also studied accounting chemical reaction impact. The governing non-linear PDEs are reduced to ODEs in non-dimensional form under adequate transformation relations. The numerical technique, namely, Runge–Kutta fourth-order is utilized to tackle the problem with shooting method. Additionally, second law analysis is presented in terms of entropy production. The effects of numerous regulating parameters occurred in the problem relevant to flow, heat and mass transport, and entropy production are discussed via graphical mode of representation. Moreover, the quantities of physical significance are computed, displayed in graphical form, and discussed. For verification of acquired results, a comparison is also made using HPM with prior research and found to be in excellent agreement. It is concluded that the fluid temperature field enhances with upsurging values of pertinent parameters. The influence of the convective surface parameter and order of reaction are found to make augmentation in mass diffusion. Further, effect of Joule heating is noticed to rise rate of heat transfer while reverse scenario observed with upsurging values of heat source parameters. The influence of viscous dissipation is seen to grow entropy production.

Open Access

Review

Article ID: 457

Review on green resources and AI for biogenic solar power

by Jyoti Bhattacharjee, Subhasis Roy

Energy Storage and Conversion, Vol.2, No.1, pp. 2(1); , 2024; 118 Views, 97 PDF Downloads

The need for clean and renewable energy has grown dramatically during the past few years. As potential candidates for producing green energy in this region, photovoltaic and bio-solar energy technologies have arisen. This review presents a novel approach for designing and developing photovoltaics and bio-solar cells using eco-friendly materials and artificial intelligence (AI) techniques. An intriguing architecture is outlined for a bio-solar cell that fuses photovoltaic electronics with photosynthetic organisms. A recyclable thin-film solar cell serves as the basis of our photovoltaic system. To further maximize the effectiveness of the device, we use AI algorithms. According to statistical calculations, the proposed bio-solar cell can produce a sizable amount of electricity while being ecologically sound. This paper outlines significant advances in developing solar cells and photovoltaics using green nanomaterials and AI, which provide exciting potential for improving energy harvesting capacity. This review also presents an overview of the effects of the potential commercialization of our strategy, its social and environmental benefits, and its pitfalls.

Open Access

Review

Article ID: 491

Battery and/or supercapacitor?—On the merger of two electrochemical storage system families

by Yuping Wu, Rudolf Holze

Energy Storage and Conversion, Vol.2, No.1, pp. 2(1), 491; , 2024; 65 Views, 30 PDF Downloads

Similarities and analogies between materials, structures, operating and construction principles of secondary batteries and supercapacitors and their electrodes are presented, named and reviewed in context. On the material level several materials used both in batteries and supercapacitors are addressed, implications from observations made in one application for the other one are highlighted. On the electrode level a continuous change of architectural details is observed when going from an electrode with high charge storage capability to an electrode supporting high currents is detected, again this overlap provides instructive ideas for both fields. On the cell level combinations of electrodes from both fields yielding hybrid devices are an obvious outcome again with implications for both fields. Ideas and suggestions for further research and development based on a deeper exchange between both families are developed.

Open Access

Review

Article ID: 480

A Mini Review on Electroosmotic Phenomena in Porous Media

by Yan Gao, Chunling Wang, Zhuo Gong, Zhiqiang Li

Energy Storage and Conversion, Vol.2, No.1, pp. 2(1), 480; , 2024; 32 Views, 23 PDF Downloads

Electroosmosis phenomenon in porous media finds widespread applications in various fields such as microfluidic systems, polymer electrolyte membrane fuel cells, oil and gas engineering, wastewater sludge dewatering and groundwater dynamics etc. Therefore, the electroosmotic flow mechanism in porous media have attracted broad interests from multiple disciplines. This paper provides an overview on the physical mechanisms and mathematical models for electroosmosis in porous media. The background of electric double layer theory and state-of-art research progress on pore-scale models for electroosmotic flow through porous media are reviewed. Two typical and significant research topics, electroosmosis under pressure coupling effect and nanoscale electroosmotic phenomena, are then focused on. The advances in theoretical analysis, numerical simulation and experimental measurements are summarized. Finally, the potential research directions for the electroosmotic flow in porous media are addressed out.

Open Access

Review

Article ID: 436

Towards sustainable solar energy solutions: Harnessing supercapacitors in PV systems

by Kerim Karabacak

Energy Storage and Conversion, Vol.2, No.1, pp. 2(1), 436; , 2024; 64 Views, 39 PDF Downloads

The integration of supercapacitors in photovoltaic (PV) energy systems holds immense potential for enhancing energy storage, reliability, and efficiency. This article provides a comprehensive overview of recent advancements, challenges, and opportunities in the utilization of supercapacitors within PV systems. Fundamental principles of supercapacitor operation, including charge storage mechanisms and electrode materials, are discussed, highlighting their unique advantages such as high power density and rapid charge/discharge capabilities. Various integration strategies, including parallel and series configurations, as well as system-level control algorithms, are examined to optimize energy management and performance. Case studies and real-world examples demonstrate the effectiveness of integrated PV and supercapacitor systems across different applications and scales. According to the results of the research, 235 publications have been made on the subject in the last fifteen years and the number of publications has doubled in the last five years. Additionally, future research directions focus on improving energy density, efficiency, and cost-effectiveness, as well as addressing challenges related to temperature sensitivity and system scalability. Overall, the integration of supercapacitors in PV systems offers promising solutions for advancing sustainable energy solutions and accelerating the transition towards a cleaner, greener future.