Power-to-Gas and Power-to-X—The History and Results of Developing a New Storage Concept

Germany’s energy transition, known as ‘Energiewende’, was always very progressive. However, it came technically to a halt at the question of large-scale, seasonal energy storage for wind and solar, which was not available. At the end of the 2000s, we combined our knowledge of both electrical and process engineering, imitated nature by copying photosynthesis and developed Power-to-Gas by combining water electrolysis with CO2-methanation to convert water and CO2 together with wind and solar power to synthetic natural gas. Storing green energy by coupling the electricity with the gas sector using its vast TWh-scale storage facility was the solution for the biggest energy problem of our time. This was the first concept that created the term ‘sector coupling’ or ‘sectoral integration’. We first implemented demo sites, presented our work in research, industry and ministries, and applied it in many macroeconomic studies. It was an initial idea that inspired others to rethink electricity as well as eFuels as an energy source and energy carrier. We developed the concept further to include Power-to-Liquid, Power-to-Chemicals and other ways to ‘convert’ electricity into molecules and climate-neutral feedstocks, and named it ‘Power-to-X’at the beginning of the 2010s.

Research, Design and Development a Model Solar Autonomous Underwater Vehicles

Autonomous Underwater Vehicle (AUV) has become the main tool for exploring the oceans in the fields of science, the military and the marine economy... However, the energy problem for AUV has always been of interest to many researchers. AUV’s missions are time-limited by constraints of onboard vehicle power. Most missions are therefore short, from 4 to 15 hours duration. Solar energy is an effective renewable energy source and has increasingly been used in many fields. We can see that if the Solar Autonomous Underwater Vehicles (S-AUV) has the little surface area then the efficiency of solar collector is low. Hence, we need to optimize the structure of S-AUV. When designing a SAUV in particular and an AUV in general, one of the first concerns is structural shapes, energy and propulsion systems. However, the problem for S-AUV shaped structure is extremely important, requiring the designer to optimize between increased size solar wing and collected solar energy. This paper discusses the use of Computational Fluid Dynamics (CFD) to determine the resistance of S-AUV when receiving solar energy. Reducing the drag and increasing the ability while collecting solar energy are the purpose of this research. The authors developed a model of S-AUV with retractable wings and evaluate the efficiency of solar energy collection. The hydrodynamic equations with the predefined conditions were modeled and solved

Infinite Energy Problem of Fractional Circuit Elements: Overview and Perspectives

Fractional circuit elements become increasingly popular due to their versatility in various applications. However, the bottleneck in deploying these tools in practice is related to an open problem, i.e, infinite energy problem. On this topic, many valuable achievements have been made. Some scholars don’t dare to use fractional circuit elements because of the infinite energy problem while some scholars believe that there is no paradox compared with classical finite energy or even some scholars think that this problem has been successfully solved. However, there is still no consensus on this topic and confusion remains widespread. Consequently, a comprehensive review on infinite energy problem is needed imperatively. At this point, this paper reviews the consequences, root causes, and potential mitigation approaches through the modeling analysis and literature survey. This review starts with the fractional capacitors. Subsequently, other fractional circuit elements and fractional order operators/systems are considered. Finally, the main technical challenges as well as future researches on this topic are highlighted carefully.

Mengusik Tidur Berjalan Umat Manusia: Menambang Energi dalam Jerat Multi-Dimensi

In The Long Emergency, James Howard Kunstler brings up tremendous arguments on what and how the civilization of mankind will face in the future if it still persists to continue to rely on the rapidly diminishing supply of fossil fuel. In his stance, the writer explains that energy problem is something more than meets the eye; it has greater impact upon the world in a way so common—yet unimaginable, beyond the old and traditional comprehension. In his multi-dimensional scope, Kunstler will take the readers off for a journey in exploring how terrible can the future of oil consuming-mankind be.

Optimasi Kombinasi Biaya Bahan Bakar dan Emisi Pembangkit Energi Listrik menggunakan Teknik Reduksi Tempat Kedudukan

ABSTRAKDalam pengoperasian pembangkit energi listrik bukan saja untuk mendapatkan biaya yang minimal, namun juga meminimalkan emisi yang dihasilkan atau dikenal dengan Combined Economic Emission Dispatch (CEED), karena emisi merupakan bagian dari permasalahan energi. Makalah ini mengusulkan teknik reduksi tempat kedudukan untuk memecahkan masalah CEED. Prinsip dasar dari teknik ini adalah menebarkan sejumlah kandidat pada tempat kedudukan, S0 yang dibentuk dari limit daya generator, dan ditentukan sebuah kandidat terbaik. S0 diperkecil dan proses diulangi hingga didapatkan tempat kedudukan yang sangat kecil dimana kandidat terbaiknya dapat dianggap sebagai titik optimal. Teknik ini lebih akurat dibandingkan dengan metoda lain seperti Gradient Method (GM), Ant Colony Optimization (ACO), Particle Swarm Optimization (PSO), JAYA Algorithm dan Whale Optimization Algorithm (WOA). Hasilnya memberikan penghematan biaya tanpa melibatkan emisi masing-masing terhadap GM, ACO, PSO, WOA dan JAYA sebesar 9,24%, 3,91%, 0,56%, 0,47% dan 0,21%, serta bila melibatkan emisi sebesar 21,28%, 16,09%, 5,52%, 5,31% dan 5,04%.Kata kunci: CEED, reduksi tempat kedudukan, penghematan biaya, optimal, akurat. ABSTRACTIn an operating, generator units not only to get minimal costs but also to consider the emissions produced, known as the Combined Economic Emission Dispatch (CEED), because emission is part of the energy problem. This paper proposes a feasible area reduction technique for solving CEED problems. The basic principle of this technique is to spread number of candidates on a feasible area, S0 which is formed by generator limits from n generator units and the best candidate is determined. S0 is reduced and the process is repeated until a very small area is found, where the best candidate can be considered the solution. This technique is more accurate than other methods such as GM, ACO, PSO, JAYA Algorithm and WOA. The result provides cost savings without involving emission of GM, ACO, PSO, WOA and JAYA of 9.24%, 3.91%, 0.56%, 0.47% and 0.21% respectively, as well as when it involves emissions amounted to 21.28%, 16.09%, 5.52%, 5.31% and 5.04% respectively.Keywords: CEED, feasible area reduction, cost saving, optimal, accurate

The Current State and Problems of the World Energy Market

The article is aimed at carrying out a comprehensive analysis of the current state of the world energy market, identifying the main problems of its functioning, and substantiating possible ways to solve them. The research considered the structure of the world energy market, provided a description of its main components. The essence of the energy problem is analyzed, the main causes of its occurrence are defined. It is found that the energy problem occupies a significant place among such global problems of humanity as the threat of nuclear war, epidemic, ecological crisis, demographic problems, international terrorism, etc. A dynamic analysis of the use of traditional energy in the world is carried out. It is determined that due to the limited global reserves of natural gas and oil, in the near future it will be impossible to meet the growing demand of humanity for energy resources. The rating of countries that are trying to actively develop green energy at the State level is presented. The main methods of energy saving of leading countries of the world are highlighted. An analysis of the scale of investment in energy efficiency and energy saving of the leading world countries is carried out. It is determined that China is the leader in investments in green energy. During the research, the essence of the concept of «energy security» is disclosed and its main priorities in the application by different countries are specified. The most important aspects of international energy security are defined. The tendencies of further development of the world energy market are highlighted and the main ways of solving energy problems are proposed.