Iranian Research Organization for Science and Technology (IROST)Hydrogen, Fuel Cell & Energy Storage2980-853712320251028Optimization of Renewable Energy and Hydrogen Production for Residential Load in Alberta: A CFD Study149168153510.22104/hfe.2025.7296.1335ENMd SaidurRahmanFaculty of Engineering and Applied Science, Memorial University of Newfoundland and Labrador, St. John’s, Canada0000-0001-8485-1301Hassan AhmadJanFaculty of Engineering and Applied Science, Memorial University of Newfoundland and Labrador, St. John’s, CanadaMuhammad RazibHasanFaculty of Engineering and Applied Science, Memorial University of Newfoundland and Labrador, St. John’s, CanadaAminEtminanFaculty of Engineering and Applied Science, Memorial University of Newfoundland and Labrador, St. John’s, Canada0000-0003-0173-7939Journal Article20250705Hydrogen, as an energy carrier, can potentially transform future energy systems significantly. However, most current commercial hydrogen production methods are carbon-intensive, contributing to atmospheric emissions. To achieve sustainable development, integrating renewable energy sources into distributed energy systems is crucial. When applied to hydrogen production, these renewable sources can drive significant growth and progress toward a cleaner, more sustainable energy future. This study aims to optimize the use of renewable energy sources in Alberta, focusing on utilizing excess electricity for hydrogen production. The novelty of this research lies in evaluating Alberta's solar and wind energy potential to lower residential electricity costs, while simultaneously harnessing surplus electricity from a hybrid system for green hydrogen production. The optimization results show that combining solar photovoltaic, wind turbines, and grid power can provide electricity at a cost 15% lower than the standard grid price. Additional financial key performance indicators, such as net present cost, return on investment, and internal rate of return, further validate the feasibility of this approach for Alberta’s residential electricity sector. Water electrolysis, a promising method for hydrogen production using renewable energy, is shown to benefit from the optimized model. The results demonstrate that surplus electricity can significantly reduce hydrogen production costs. Numerical analysis of water electrolysis reveals that the hydrogen gas volume fraction can reach up to 0.2 near the electrode surface and at the electrode's top due to gas accumulation and flow rate dynamics. Furthermore, the distance between the electrode and separator plays a crucial role in hydrogen production; increasing this distance significantly reduces hydrogen output. Analyzing the mid-separator current density in the laminar flow regime suggests that maintaining a consistent current density can enhance electrode longevity and ensure stable hydrogen production.https://hfe.irost.ir/article_1535_748ba69d3e8d1af87f84fee909eef339.pdfIranian Research Organization for Science and Technology (IROST)Hydrogen, Fuel Cell & Energy Storage2980-853712320250701Utilization of a Fifth-Order Model for Analyzing Stirling Oscillators169180149210.22104/hfe.2024.7207.1329ENShahriarNiknejadDepartment of Mechanical Engineering, Iranian Research Organization for Science and Technology (IROST), Tehran, IranAmirFassihDepartment of Mechanical Engineering, Iranian Research Organization for Science and Technology (IROST), Tehran, IranAmirMobiniDepartment of Mechanical Engineering, Iranian Research Organization for Science and Technology (IROST), Tehran, IranHeybatollahJokarDepartment of Mechanical Engineering, Firouzabad Higher Education Center, Shiraz University of Technology, Shiraz, IranShahryarZareDepartment of Mechanical Engineering, Iranian Research Organization for Science and Technology (IROST), Tehran, IranJournal Article20250630In this study, for the first time, the design of a free-piston Stirling oscillator (FPSO) using a fifth-order model is addressed. Initially, the free-piston Stirling oscillator is introduced. Then, considering the limited heat transfer coefficient, the fifth-order mechanical model of the oscillator is derived. Subsequently, the design parameters, including the stiffness and mass of the power piston and displacer piston, as well as the cross-sectional area of the rod connecting to the displacer piston, are examined. Then, the design parameters are estimated based on the objectives (a desired frequency between 70 and 100 rad/s, and the real value of the dominant closed-loop pole between 5 and 17) and the fifth-order mechanical model. Nonlinear analysis is then performed to investigate the effects of variations in frequency and the real value of the dominant closed-loop poles on the output power and phase difference between the pistons of the oscillator. The results of this study demonstrate that the use of a fifth-order model offers a more accurate evaluation and analysis of the dynamic behavior of this type of oscillator.https://hfe.irost.ir/article_1492_e655c7716a4b3ea67f48c6322fc42ed6.pdfIranian Research Organization for Science and Technology (IROST)Hydrogen, Fuel Cell & Energy Storage2980-853712320251101Enhanced Cooling System Design for Single and Double Pass Condensers: A Comprehensive Technical, Chemical, Economic, and Environmental Feasibility Study181192149310.22104/hfe.2024.7178.1328ENMohammadDanesh AzariDepartment of Mechanical Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, IranSeyyed FaramarzRanjbarDepartment of Mechanical Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran0000-0001-5154-4786FaramarzTalatiDepartment of Mechanical Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, IranMoharramJafariDepartment of Mechanical Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, IranJournal Article20250715The escalating global crises of fossil fuel depletion and emission threats are motivating developed nations to adopt electric vehicles (EVs) as a sustainable transportation alternative. While EVs offer notable advantages, including reduced environmental impact, they also present challenges such as high initial costs, increased electronic waste pollution, and potential electricity supply constraints. Some countries are exploring hydrogen-based fuels for internal combustion engines, but challenges related to hydrogen storage and safety remain significant. To address these issues, research is increasingly focused on transitioning internal combustion engines to low-emission technologies, such as reactivity-controlled compression ignition (RCCI) engines, and incorporating hydrogen-enriched biofuels. This study investigates the performance of RCCI engines using various ammonium hydroxide energy shares (30%, 35%, and 40%) as hydrogen carriers, combined with biodiesel derived from waste lather fat (WLFO) blended with 100 ppm of nanoparticles. The results reveal that a blend comprising 35% ammonium hydroxide and 65\% WLFO achieves substantial reductions in nitrogen oxides (9.2%), hydrocarbons (27%), and smoke (26%) compared to conventional diesel in an RCCI engine. Additionally, this blend maintains comparable heat release rates, brake thermal efficiency, and brake-specific energy consumption, demonstrating its potential as a cleaner and efficient alternative fuel.https://hfe.irost.ir/article_1493_1714726c817af50457d810aae9d27a2e.pdfIranian Research Organization for Science and Technology (IROST)Hydrogen, Fuel Cell & Energy Storage2980-853712320251101Energy and Exergy Investigation of a Multigeneration System Based on Solar and Geothermal Energy Sources193202148610.22104/hfe.2024.7164.1320ENAmmar Jalal AbdulrazzaqAl-TabatabaeeDepartment of Mechanical Engineering, Engineering Faculty, Urmia University, Urmia, IranIrajMirzaeeDepartment of Mechanical Engineering, Engineering Faculty, Urmia University, Urmia, Iran0000-0002-3523-5251MortezaKhalilianDepartment of Mechanical Engineering, Engineering Faculty, Urmia University, Urmia, Iran0009-0003-1907-3461Journal Article20250711The research focuses on evaluating the energetic and exergetic sights of a newly developed multigeneration system utilizing geothermal energy and PVT solar collectors to create electricity, cooling, heat, hydrogen, and fresh water. This setup includes an organic Rankine cycle, a single-effect absorption chiller, a heat pump, a RO desalination unit and a PEM electrolyzer. The EES software was utilized to analyze thermodynamic and various parameters. Findings indicate that the system achieves energetic and exergetic outcomes of 10.29% and 36.77%, respectively. The net power output of the system totals 2004.86 kW, primarily driven by the ORC turbine. In addition, the cooling system realizes energetic and exergetic COPs of 0.54 and 0.22 based on the specified hypothesis. The system generates hydrogen at a daily rate of 796.8 kg and freshwater at a rate of 5.52 kg/s. Exergy destruction rate analysis reveals that the organic Rankine cycle suffers the most significant exergy loss.https://hfe.irost.ir/article_1486_86df7dcfd896fcaf2674f757a2463eba.pdfIranian Research Organization for Science and Technology (IROST)Hydrogen, Fuel Cell & Energy Storage2980-853712320251101Simulation of the Dynamic Behavior of the Load Frequency Control System in the Power Network by Combining Different Power Plant203216149410.22104/hfe.2024.7214.1330ENMohammadrezaMoradianDepartment of Electrical Engineering, Na.C., Islamic Azad University, Najafabad, IranSmart Microgrid Research Centre, Na.C., Islamic Azad University, Najafabad, Iran0000-0001-8581-000XGhazanfarShahgholianDepartment of Electrical Engineering, Na.C., Islamic Azad University, Najafabad, IranSmart Microgrid Research Centre, Na.C., Islamic Azad University, Najafabad, Iran0000-0003-2774-4694Journal Article20250714Maintaining a relatively constant frequency is crucial in power systems. The secondary control loop plays a key role in ensuring that the frequency stays close to nominal values, while also managing the power exchange between interconnected control areas through established transmission lines. This study focuses on examining and simulating the dynamic behavior of interconnected power systems. Various power system configurations are explored, incorporating steam, hydro, and gas power plants. We present MATLAB-based simulations for both two-area and three-area power systems. The results of these time-domain simulations are analyzed by calculating the eigenvalues of the power system matrix across different scenarios. The findings indicate that in response to step changes in demand load, independent areas exhibit varying frequency droop characteristics, with gas power plants showing the least frequency droop and hydro power plants displaying the most significant frequency droop.https://hfe.irost.ir/article_1494_fcdf25d6e191893e705819b177cddea0.pdfIranian Research Organization for Science and Technology (IROST)Hydrogen, Fuel Cell & Energy Storage2980-853712320251101An Improved Zero Current Transition High Step-Up Single-Switch Converter for Fuel Cell Applications217226151710.22104/hfe.2025.7255.1331ENRasolSarebanDepartment of Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran0009-0000-9444-0899MohammadrezaAminiDepartment of Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, IranMajidDelshadDepartment of Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran0000-0002-2637-5965Mohammad RouhollahYazdaniDepartment of Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, IranJournal Article20250514In this sudy, a new high step-up converter with reduced input current ripple and low voltage stress is presented. The converter features a minimal number of components, leading to reduced volume and cost. A lossless snubber is employed to achieve zero-current switching (ZCS) during turn-on and zero-voltage switching (ZVS) during turn-off. Additionally, all diodes operate under zero-current conditions, effectively eliminating reverse recovery issues. Furthermore, the snubber capacitor's stored energy is efficiently delivered to the output rather than being dissipated in the converter. Another advantage is that the energy from leakage inductances is captured by the lift capacitor, effectively eliminating voltage spikes on the switch. The proposed converter exhibits minimal input current ripple and outstanding efficiency, making it an excellent choice for integration into fuel cell systems. A comprehensive analysis of the converter has been conducted, and a 100W prototype has been both simulated and built to validate the circuit analysis. Experimental results demonstrate an efficiency of 95% under nominal load conditions.https://hfe.irost.ir/article_1517_81c8727c62e800be708dbf37c4695dff.pdf