- Home
- A-Z Publications
- Publications
Publications
System Analysis and Requirements Derivation of a Hydrogen-electric Aircraft Powertrain
Sep 2022
Publication
In contrast to sustainable aviation fuels for use in conventional combustion engines hydrogen-electric powertrains constitute a fundamentally novel approach that requires extensive effort from various engineering disciplines. A transient system analysis has been applied to a 500 kW shaft-power-class powertrain. The model was fed with high-level system requirements to gain a fundamental understanding of the interaction between sub-systems and compo Read More
A Review of the Integrated Renewable Energy Systems for Sustainable Urban Mobility
Aug 2022
Publication
Several challenges have emerged due to the increasing deterioration of urban mobility and its severe impacts on the environment and human health. Primary dependence on internal combustion engines that use petrol or diesel has led to poor air quality time losses noise traffic jams and further environmental pollution. Hence the transitions to using rail and or seaway-based public transportation cleaner fuels and electric vehicles are some Read More
Increasing the Energy Efficiency of Gas Boosters for Hydrogen Storage and for Refueling Stations
Feb 2023
Publication
A new electrically driven gas booster is described as an alternative to the classical air-driven gas boosters known for their poor energetic efficiency. These boosters are used in small scale Hydrogen storage facilities and in refueling stations for Hydrogen vehicles. In such applications the overall energy count is of significance and must include the efficiency of the compression stage. The proposed system uses an electric motor instead of the pneumatic actu Read More
The Hydrogen Color Spectrum: Techno-Economic Analysis of the Available Technologies for Hydrogen Production
Feb 2023
Publication
Hydrogen has become the most promising energy carrier for the future. The spotlight is now on green hydrogen produced with water electrolysis powered exclusively by renewable energy sources. However several other technologies and sources are available or under development to satisfy the current and future hydrogen demand. In fact hydrogen production involves different resources and energy loads depending on the production method used. T Read More
Optimal Design of Photovoltaic, Biomass, Fuel Cell, Hydrogen Tank Units and Electrolyzer Hybrid System for a Remote Area in Egypt
Jul 2022
Publication
In this paper a new isolated hybrid system is simulated and analyzed to obtain the optimal sizing and meet the electricity demand with cost improvement for servicing a small remote area with a peak load of 420 kW. The major configuration of this hybrid system is Photovoltaic (PV) modules Biomass gasifier (BG) Electrolyzer units Hydrogen Tank units (HT) and Fuel Cell (FC) system. A recent optimization algorithm namely Mayfly Optimization Algorithm (MOA Read More
A CFD Analysis of Liquid Hydrogen Vessel Explosions using the ADREA-HF Code
Sep 2021
Publication
Despite hydrogen is one of the most suitable candidates in replacing fossil fuels its very low densityrepresents a drawback when it is stored. The liquefaction process can increase the hydrogen densityand therefore enhance its storage capacity. The boiling liquid expanding vapour explosion (BLEVE) isa typical accident scenario that must be always considered when liquefied gases are stored. Inparticular BLEVE is a physical explosion with low probabilities Read More
Design and Multi-scenario Optimization of a Hybrid Power System Based on a Working Gas Turbine: Energy, Exergy, Exergoeconomic and Environmental Evaluation
Sep 2022
Publication
The rising demand for electricity along with the need to minimize carbon footprints has motivated academics to investigate the flexible and efficient integration of energy conversion technologies. A novel hybrid power generation system based on environmentally friendly and cost-effective technologies to recover the waste heat of a working gas turbine is designed and assessed in different scenarios of multi-objective optimization from energy exerg Read More
A Review of the Use of Electrolytic Cells for Energy and Environmental Applications
Feb 2023
Publication
There is a significant push to reduce carbon dioxide (CO2) emissions and develop low-cost fuels from renewable sources to replace fossil fuels in applications such as energy production. As a result CO2 conversion has gained widespread attention as it can reduce the accumulation of CO2 in the atmosphere and produce fuels and valuable industrial chemicals including carbon monoxide alcohols and hydrocarbons. At the same time finding ways to store en Read More
Beyond the triangle of renewable Energy Acceptance: The Five Dimensions of Domestic Hydrogen Acceptance
Aug 2022
Publication
The ‘deep’ decarbonization of the residential sector is a priority for meeting national climate change targets especially in countries such as the UK where natural gas has been the dominant fuel source for over half a century. Hydrogen blending and repurposing the national grid to supply low-carbon hydrogen gas may offer respective short- and long-term solutions to achieving emissions reduction across parts of the housing sector. Despite this imperativ Read More
Perspective on the Hydrogen Economy as a Pathway to Reach Net-zero CO2 Emissions in Europe
Jan 2022
Publication
The envisioned role of hydrogen in the energy transition – or the concept of a hydrogen economy – has varied through the years. In the past hydrogen was mainly considered a clean fuel for cars and/or electricity production; but the current renewed interest stems from the versatility of hydrogen in aiding the transition to CO2 neutrality where the capability to tackle emissions from distributed applications and complex industrial processes is of paramoun Read More
Economic Analysis of a Hydrogen Power Plant in the Portuguese Electricity Market
Feb 2023
Publication
Hydrogen is regarded as a flexible energy carrier with multiple applications across several sectors. For instance it can be used in industrial processes transports heating and electrical power generation. Green hydrogen produced from renewable sources can have a crucial role in the pathway towards global decarbonization. However the success of green hydrogen production ultimately depends on its economic sustainability. In this context this work ev Read More
Boosting Carbon Efficiency of the Biomass to Liquid Process with Hydrogen from Power: The Effect of H2/CO Ratio to the Fischer-Tropsch Reactors on the Production and Power Consumption
Jun 2019
Publication
Carbon efficiency of a biomass to liquid process can be increased from ca. 30 to more than 90% by adding hydrogen generated from renewable power. The main reason is that in order to increase the H2/CO ratio after gasification to the value required for Fischer-Tropsch (FT) synthesis the water gas shift reaction step can be avoided; instead a reversed water gas shift reactor is introduced to convert produced CO2 to CO. Process simulations are done for a 4 Read More
Decentral Production of Green Hydrogen for Energy Systems: An Economically and Environmentally Viable Solution for Surplus Self-Generated Energy in Manufacturing Companies?
Feb 2023
Publication
Power-to-X processes where renewable energy is converted into storable liquids or gases are considered to be one of the key approaches for decarbonizing energy systems and compensating for the volatility involved in generating electricity from renewable sources. In this context the production of “green” hydrogen and hydrogen-based derivatives is being discussed and tested as a possible solution for the energy-intensive industry sector in particular Read More
Annealing Effects on SnO2 Thin Film for H2 Gas Sensing
Sep 2022
Publication
Hydrogen (H2 ) is attracting attention as a renewable energy source in various fields. However H2 has a potential danger that it can easily cause a backfire or explosion owing to minor external factors. Therefore H2 gas monitoring is significant particularly near the lower explosive limit. Herein tin dioxide (SnO2 ) thin films were annealed at different times. The as-obtained thin films were used as sensing materials for H2 gas. Here the performance of the SnO2 t Read More
Spontaneous Ignition of Cryo-Compressed Hydrogen in a T-Shaped Channel System
Aug 2022
Publication
Sudden releases of pressurised hydrogen may spontaneously ignite by the so-called “diffusion ignition” mechanism. Several experimental and numerical studies have been performed on spontaneous ignition for compressed hydrogen at ambient temperature. However there is no knowledge of the phenomenon for compressed hydrogen at cryogenic temperatures. The study aims to close this knowledge gap by performing numerical experim Read More
Solar Hydrogen Fuel Generation from Wastewater—Beyond Photoelectrochemical Water Splitting: A Perspective
Oct 2022
Publication
Green hydrogen—a carbon-free renewable fuel—has the capability to decarbonise a variety of sectors. The generation of green hydrogen is currently restricted to water electrolysers. The use of freshwater resources and critical raw materials however limits their use. Alternative water splitting methods for green hydrogen generation via photocatalysis and photoelectrocatalysis (PEC) have been explored in the past few decades; however their comme Read More
The New Model of Energy Cluster Management and Functioning
Sep 2022
Publication
This article was aimed to answer the question of whether local energy communities have a sufficient energy surplus for storage purposes including hydrogen production. The article presents an innovative approach to current research and a discussion of the concepts of the collective prosumer and virtual prosumer that have been implemented in the legal order and further amended in the law. From this perspective it was of utmost importance to analyze the Read More
From Biogas to Hydrogen: A Techno-Economic Study on the Production of Turquoise Hydrogen and Solid Carbons
Sep 2022
Publication
Biogas is a renewable feedstock that can be used to produce hydrogen through the decomposition of biomethane. However the economics of the process are not well studied and understood especially in cases where solid carbons are also produced and which have a detrimental effect on the performance of the catalysts. The scale as well as product diversification of a biogas plant to produce hydrogen and other value-added carbons plays a crucial rol Read More
Laminar Burning Velocity, Markstein Length and Cellular Instability of Spherically Propagating NH2/H2/Air Premixed Flames at Various Pressures
Sep 2021
Publication
Blending hydrogen into ammonia can I mprove the burning intensity of ammonia and the safety of hydrogen and it is important to understand the flames of NH3/H2/air mixtures. In this work lamiar flame characteristics of 50-50 (vol%) ammonia-hydrogen mixtures in air were studied using the spherical flame propagation method in a constant-volume bom at initital temperature Tu = 298K and different pressures.
Effect on Diesel Engine Performance Parameters Using Hydrogen and Oxygen Produced on Demand
Oct 2022
Publication
Hydrogen is seen as a future energy carrier since its chemical compounds make up a large part of the Earth’s surface. This study sought to analyze the impact related to the inclusion of hydrogen and oxygen gases produced on demand by an alkaline electrolyzer to the engine added directly through the fuel intake line. For this purpose performance parameters were monitored such as liquid fuel consumption and greenhouse gas emissions and correlat Read More
No more items...