Records with Keyword: Energy Conversion
Showing records 1 to 25 of 48. [First] Page: 1 2 Last
Study on Mechanical Behavior and Mechanism of Sandstone under the Coupling Effect of Water Content and Dynamic Load
Yang Chen, Ting Kang, Chao Wu
September 20, 2023 (v1)
Keywords: crushing characteristics, Energy Conversion, impact load, saturation degree, weakening of strength
In the process of underground engineering construction, rock mass often faces the dual influence of dynamic load disturbance and groundwater, it is therefore essential to investigate the mechanical response of the rock mass under the coupling effect of dynamic load disturbance and water content. In this paper, dynamic load impact tests were carried out on sandstone with bullet velocities of 5 m/s, 10 m/s, and 15 m/s and water content of 0, 0.3, 0.6, and 0.9, and the mechanical behavior and mechanism response of water content to sandstone were investigated. The research findings indicate that this study has made significant contributions in quantifying the along grain and trans-grain fractures of microcracks. It has explored the influence of water content and dynamic loading on the strength mechanism of sandstone. It was discovered that the dynamic loading and water content significantly affect the ratio of along grain and trans-grain fractures, thereby influencing the dynamic behavior... [more]
A Comprehensive Review and Analytical Comparison of Non-Isolated DC-DC Converters for Fuel Cell Applications
Furqan A. Abbas, Thealfaqar A. Abdul-Jabbar, Adel A. Obed, Anton Kersten, Manuel Kuder, Thomas Weyh
April 28, 2023 (v1)
Keywords: analytical comparison, DC-DC converters, Energy Conversion, fuel cell applications, fuel cell systems, non-isolated converters, power converter applications, power management
The use of renewable energy sources such as solar photovoltaic, wind, and fuel cells is becoming increasingly prevalent due to a combination of environmental concerns and technological advancements, as well as decreasing production costs. Power electronics DC-DC converters play a key role in various applications, including hybrid energy systems, hybrid vehicles, aerospace, satellite systems, and portable electronic devices. These converters are used to convert power from renewable sources to meet the demands of the load, improving the dynamic and steady-state performance of green generation systems. This study presents a comparison of the most commonly used non-isolated DC-DC converters for fuel cell applications. The important factors considered in the comparison include voltage gain ratio, voltage switch stress, voltage ripple, efficiency, cost, and ease of implementation. Based on the comparison results, the converters have been grouped according to voltage level applications, with... [more]
Numerical and Experimental Investigation of a Semi-Active Vibration Control System by Means of Vibration Energy Conversion
Chaoqing Min, Martin Dahlmann, Thomas Sattel
April 24, 2023 (v1)
Keywords: Energy Conversion, mechanical switch, semi-active vibration control, serial springs, variable structure
A vibration control concept based on vibration energy conversion and storage with respect to a serial-stiffness-switch system (4S) has previously been proposed. Here, we first present a rotational electromagnetic serial-stiffness-switch system as a novel practical vibration control system for experimental validation of the concept and, furthermore, an improved control strategy for higher vibration suppression performance is also proposed. The system consists of two spring-switch elements in series, where a parallel switch can block a spring. As an alternating mechanical switch, the experimental system uses two electromagnets with a shared armature. By connecting the armature to the rotating load or the base, the electromagnets decide which of the two spiral springs is blocked, while the other is active. A switching law based on the rotation velocity of the payload is used. Modelling and building of the experimental system were carried out. The corresponding experiment and simulation we... [more]
Energy Processes, Systems and Equipment
Izabela Sówka, Sławomir Pietrowicz, Piotr Kolasiński
April 14, 2023 (v1)
Subject: Environment
Keywords: ecological and legal aspects, Energy Conversion, Energy Storage, fuels
The scientific and technical issues related to energy harvesting and conversion are inseparably bound to the issues of environmental protection. Energy conversion systems and devices that are applied for converting the chemical energy contained in different fuels into heat, electricity, and cold in industry and housing are sources of different gases and solid particle emissions. Thus, the development of different technologies for energy conversion and environmental protection that can be jointly applied to cover growing energy needs has become a crucial challenge for scientists and engineers around the world. Progress in the precise description, modeling, and optimization of physical and chemical phenomena related to these energy conversion systems is a key research and development field for the economy. Legal and social issues that are affecting key aspects and problems related to the energy conversion and power sector are also significant and worth investigating. The aim of Energy Pr... [more]
Energy Conversion System and Control of Fuel-Cell and Battery-Based Hybrid Drive for Light Aircraft
Tomasz Miazga, Grzegorz Iwański, Marcin Nikoniuk
April 13, 2023 (v1)
Keywords: aircraft propulsion, Energy Conversion, energy management, fuel cell, power converter
The paper presents a power electronic conversion system and its control for a fuel cell and a battery-based hybrid drive system for a motor glider. The energy conversion system is designed in such a way that the fuel cell gives power equal to the electric drive power demand for horizontal flight, whereas during motor glider take-off and climbing, the fuel cell is supported by the battery. The paper presents the power demand related to the assumed mission profile, the main components of the hybrid drive system and its holistic structure, and details of power electronics control. Selected stationary experimental test results related to the energy conversion and drive system are shown. Some results related to the aircraft tests on a runway are presented.
Relative Stability of Electrical into Mechanical Conversion with BLDC Motor-Cascade Control
Sylwester Sobieraj, Grzegorz Sieklucki, Józef Gromba
April 13, 2023 (v1)
Keywords: BLDC motor, cascade control, Energy Conversion, Kharitonov theorem, PI controller, relative stability
The conversion of the electrical energy into the mechanical is usually realized by a motor, power electronics and cascade control. The relative stability (Θ-stability), i.e., the displacement of its eigenvalues of this system is analyzed for a drive with a BLDC motor. The influence of changing the basic parameters of the motor and power supply system on the drive operation is considered. 4th order closed-loop transfer-function of the cascade control is presented, where boundaries of the transfer-function coefficients are used. The cascade system which uncertainty of the resistance, inductance, flux and gain parameters is analyzed. Theoretical calculations for the cascade control, simulations and laboratory tests are included in the article.
Proton Exchange Membrane Hydrogen Fuel Cell as the Grid Connected Power Generator
Koushik Ahmed, Omar Farrok, Md Mominur Rahman, Md Sawkat Ali, Md Mejbaul Haque, Abul Kalam Azad
April 12, 2023 (v1)
Keywords: electrical grid, Energy Conversion, fuel cell, green power sources, hydrogen energy, PEMFC, power generation
In this paper, a proton exchange membrane fuel cell (PEMFC) is implemented as a grid-connected electrical generator that uses hydrogen gas as fuel and air as an oxidant to produce electricity through electrochemical reactions. Analysis demonstrated that the performance of the PEMFC greatly depends on the rate of fuel supply and air supply pressure. Critical fuel and air supply pressures of the PEMFC are analysed to test its feasibility for the grid connection. Air and fuel supply pressures are varied to observe the effects on the PEMFC characteristics, efficiency, fuel supply, and air consumption over time. The PEMFC model is then implemented into an electrical power system with the aid of power electronics applications. Detailed mathematical modelling of the PEMFC is discussed with justification. The PEMFC functions as an electrical generator that is connected to the local grid through a power converter and a transformer. Modulation of the converter is controlled by means of a proport... [more]
Conventional or Microwave Sintering: A Comprehensive Investigation to Achieve Efficient Clean Energy Harvesting
Siva Sankar Nemala, Sujitha Ravulapalli, Sudhanshu Mallick, Parag Bhargava, Sivasambu Bohm, Mayank Bhushan, Anukul K. Thakur, Debananda Mohapatra
April 11, 2023 (v1)
Keywords: commercialization, dye-sensitized solar cells (DSSCs), Energy Conversion, microwave sintering, photoanode
Layers of titania are the critical components in sensitized photovoltaics. The transfer of electrons occurs from the dye molecule to the external circuit through a transparent conducting oxide, namely fluorine-doped tin oxide (FTO). Porosity, interparticle connectivity, and the titania films’ defects play a vital role in assessing the dye-sensitized solar cells’ (DSSCs) performance. The conventional methods typically take several hours to fabricate these layers. This is a significant impediment for the large-scale manufacture of DSSCs. This step can be reduced to a few hours by a microwave sintering process and may facilitate the rapid fabrication of the critical layers for sensitized photovoltaics, thus, boosting the prospects for the commercialization of these devices. In the present study, we aimed to perform different heat treatments (conventional and microwave) on the titania films with different temperatures to understand the phase formation, transmittance, and porosity without l... [more]
Numerical Calculation and Uncertain Optimization of Energy Conversion in Interior Ballistics Stage
Tong Xin, Guolai Yang, Liqun Wang, Quanzhao Sun
April 4, 2023 (v1)
Subject: Optimization
Keywords: energy calculation of gun firing system, Energy Conversion, energy distribution, Energy Efficiency, uncertain optimization
Gun firing is a process that converts propellant chemical energy to projectile kinetic energy and other kinds of energies. In order to explore the energy conversion process, firstly, the interior ballistics mathematical model and the barrel-projectile finite element model are built and solved. Then, the related variable values and energy values are obtained and discussed. Finally, for improving energy efficiency, the interval uncertainty optimization problem is modeled, and then solved using the two-layer nested optimization strategy and back-propagation (BP) neural network surrogate model. Calculation results show that, after optimization, the heat efficiency raises from 31.13% to 33.05% and the max rifling stress decreases from 893.68 to 859.76 Mpa, which would improve the firing performance and prolong the lifetime of the gun barrel.
Performance of Thermoelectric Power-Generation System for Sufficient Recovery and Reuse of Heat Accumulated at Cold Side of TEG with Water-Cooling Energy Exchange Circuit
Zhe Zhang, Yuqi Zhang, Xiaomei Sui, Wenbin Li, Daochun Xu
April 4, 2023 (v1)
Keywords: Energy Conversion, heat recovery, thermoelectric, water-cooling
Aiming to reduce thermal energy loss at the cold side of a thermoelectric generator (TEG) module during thermoelectric conversion, a thermoelectric energy conversion system for heat recovery with a water-cooling energy exchange circuit was devised. The water-cooling energy exchange circuit realized sufficient recovery and reuse of heat accumulated at the cold side of the TEG, reduced the danger of heat accumulation, improved the stability and output capacity of thermoelectric conversion, and provided a low-cost and high-yield energy conversion strategy in energy conversion and utilization. Through the control variable method to adjust the heat generation of the heat source in the thermoelectric conversion, critical parameters (e.g., inner resistance of the TEG, temperatures of thermoelectric modules, temperature differences, output current, voltage, power, and efficiency of thermoelectric conversion) were analyzed and discussed. After using the control variable method to change the rat... [more]
Demand Flexibility Enabled by Virtual Energy Storage to Improve Renewable Energy Penetration
Gabriele Fambri, Marco Badami, Dimosthenis Tsagkrasoulis, Vasiliki Katsiki, Georgios Giannakis, Antonis Papanikolaou
April 3, 2023 (v1)
Keywords: energy balance optimisation, Energy Conversion, flexibility, renewable energy integration, virtual energy storage
The increasing resort to renewable energy distributed generation, which is needed to mitigate anthropogenic CO2 emissions, leads to challenges concerning the proper operation of electric distribution systems. As a result of the intrinsic nature of Renewable Energy Sources (RESs), this generation shows a high volatility and a low predictability that make the balancing of energy production and consumption difficult. At the same time, the electrification of new energy-intensive sectors (such as heating) is expected. This complex scenario paves the way for new sources of flexibility that will have more and more relevance in the coming years. This paper analyses how the electrification of the heating system, combined with an electric flexibility utilisation module, can be used to mitigate the problems related to the fluctuating production of RES. By using Power-to-Heat (P2H) technologies, buildings are able to store the overproduction of RES in the form of thermal energy for end-use accordi... [more]
Thermochemical Conversion of Biomass and Municipal Waste into Useful Energy Using Advanced HiTAG/HiTSG Technology
Jan Stąsiek, Marek Szkodo
March 31, 2023 (v1)
Keywords: Biomass, Energy Conversion, HiTAG/HiTSG technology, technoeconomic study, wood pellets
An advanced thermal conversion system involving high-temperature gasification of biomass and municipal waste into biofuel, syngas or hydrogen-rich gas is presented in this paper. The decomposition of solid biomass and wastes by gasification is carried out experimentally with a modern and innovative regenerator and updraft continuous gasifier, among others. A ceramic high-cycle regenerator provides extra energy for the thermal conversion of biomass or any other solids waste. Highly preheated air and steam gas (heated up to 1600 °C) was used as an oxidizing or gasification agent (feed gas). Preheated feed gas also enhances the thermal decomposition of the gasification solids for fuel gas. However, the main objective of this work is to promote new and advanced technology for the thermochemical conversion of biomass for alternative energy production. Selected results from experimental and numerical studies are also presented.
Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition
Hesam Moghadasi, Navid Malekian, Hamid Saffari, Amir Mirza Gheitaghy, Guo Qi Zhang
March 28, 2023 (v1)
Subject: Materials
Keywords: critical heat flux, Energy Conversion, metal oxide, nanoparticle deposition, pool boiling
Pool boiling is an effective heat transfer process in a wide range of applications related to energy conversion, including power generation, solar collectors, cooling systems, refrigeration and air conditioning. By considering the broad range of applications, any improvement in higher heat-removal yield can ameliorate the ultimate heat usage and delay or even avoid the occurrence of system failures, thus leading to remarkable economic, environmental and energy efficiency outcomes. A century of research on ameliorating critical heat flux (CHF) has focused on altering the boiling surface characteristics, such as its nucleation site density, wettability, wickability and heat transfer area, by many innovative techniques. Due to the remarkable interest of using nanoparticle deposition on boiling surfaces, this review is targeted towards investigating whether or not metal oxide nanoparticles can modify surface characteristics to enhance the CHF. The influence of nanoparticle material, thermo... [more]
Design and Experiment of a Power Sharing Control Circuit for Parallel Fuel Cell Modules
Chien-Chang Wu, Tsung-Lin Chen
March 27, 2023 (v1)
Keywords: DC/DC converter, Energy Conversion, Fuel Cells, parallel architectures, power distribution
In this paper, a novel control circuit that can connect fuel cell (FC) modules in parallel is proposed, which is particularly useful when the employed FCs have different electrical characteristics. Conventional methods (e.g., DC/DC converters) are not applicable in such situations because they cannot regulate the power output of each source in a parallel-connected topology. Consequently, the uniformity requirement of FCs increases and becomes costly. In contrast to existing methods, the proposed method adopts a novel power-feedback method to control the power output of each FC module under both rated conditions and load changes, which in turn determines the operating point of each FC module. Therefore, the uniformity requirement can be relaxed. For proof of concept, the experiments employed two FC-like sources with different I−V characteristics. The experimental results indicated that the power assignment under the rated condition had a relative error of < 6.62%. The distribution ra... [more]
Autonomous Energy Matching Control in an LLC Induction Heating Generator
Jerzy Zgraja, Grzegorz Lisowski, Jacek Kucharski
March 24, 2023 (v1)
Keywords: effective induction heating, Energy Conversion, energy matching, inductive power transmission, resonance inverter
Induction heating is one of the most effective methods of energy conversion from the electrical to thermal form, used in diverse industrial processes. In this paper the resonance generators for induction heating are considered for which the equivalent load resistance has a strong impact on the ability of the system to use optimally the potentially available power. The equivalent load resistance varies, depending on the type of induction heating system (IHS) and during the heating process itself. This paper presents an induction heat generator in which an L-LC resonance system (called the LLC system) plays an active role in energy matching. The LLC resonance system is analyzed from the point of view of both the functional dependencies describing the influence of frequency on the load resistance transformation, and the impact of the LLC setup on the sensitivity of the generator to changes in the charge resistance caused by heating. The procedure for initial selection of the resonance sys... [more]
Neoclassical Navier−Stokes Equations Considering the Gyftopoulos−Beretta Exposition of Thermodynamics
Janusz Badur, Michel Feidt, Paweł Ziółkowski
March 24, 2023 (v1)
Keywords: available energy, balance of energy, Energy, Energy Conversion, energy flux, energy interactions, Energy Storage, entropy flux, Gyftopoulos–Beretta exposition, irreversibility, mass flux, neoclassical Navier–Stokes, volume flux
The seminal Navier−Stokes equations were stated even before the creation of the foundations of thermodynamics and its first and second laws. There is a widespread opinion in the literature on thermodynamic cycles that the Navier−Stokes equations cannot be taken as a thermodynamically correct model of a local “working fluid”, which would be able to describe the conversion of “heating” into “working” (Carnot’s type cycles) and vice versa (Afanasjeva’s type cycles). Also, it is overall doubtful that “cycle work is converted into cycle heat” or vice versa. The underlying reason for this situation is that the Navier−Stokes equations come from a time when thermodynamic concepts such as “internal energy” were still poorly understood. Therefore, this paper presents a new exposition of thermodynamically consistent Navier−Stokes equations. Following that line of reasoning—and following Gyftopoulos and Beretta’s exposition of thermodynamics—we introduce the basic concepts of thermodynamics such a... [more]
A Decision Support System Tool to Manage the Flexibility in Renewable Energy-Based Power Systems
Marco Badami, Gabriele Fambri, Salvatore Mancò, Mariapia Martino, Ioannis G. Damousis, Dimitrios Agtzidis, Dimitrios Tzovaras
March 22, 2023 (v1)
Keywords: decision support system, Energy Conversion, flexibility, Renewable and Sustainable Energy, renewable energy integration
Renewable Energy Sources (RES) have taken on an increasingly important role in the energy mix in the last few years, and it has been forecasted that this trend will continue in the future. The energy production from these sources is not dispatchable, and the increasing penetration of RES in energy mixes may therefore lead to a progressive loss of generation control and predictability. It has become clear that, to reach higher RES penetration levels, it is essential to increase power system flexibility in order to ensure stable operations are maintained. An ICT (Information and Communication Technology) tool that may be used to manage and optimize the flexibility offered by energy storage and conversion systems is described in this paper with specific reference to the Decision Support System (DSS) developed within the H2020 PLANET (PLAnning and operational tools for optimizing energy flows and synergies between energy NETworks) project. The paper focuses on how the PLANET DSS tool evalu... [more]
Predicting the Parameters of Vortex Bladeless Wind Turbine Using Deep Learning Method of Long Short-Term Memory
Mahsa Dehghan Manshadi, Majid Ghassemi, Seyed Milad Mousavi, Amir H. Mosavi, Levente Kovacs
March 10, 2023 (v1)
Keywords: Artificial Intelligence, Computational Fluid Dynamics, data science, deep learning, Energy, Energy Conversion, long short-term memory, Machine Learning, Renewable and Sustainable Energy, wind turbine
From conventional turbines to cutting-edge bladeless turbines, energy harvesting from wind has been well explored by researchers for more than a century. The vortex bladeless wind turbine (VBT) is considered an advanced design that alternatively harvests energy from oscillation. This research investigates enhancing the output electrical power of VBT through simulation of the fluid−solid interactions (FSI), leading to a comprehensive dataset for predicting procedure and optimal design. Hence, the long short-term memory (LSTM) method, due to its time-series prediction accuracy, is proposed to model the power of VBT from the collected data. To find the relationship between the parameters and the variables used in this research, a correlation matrix is further presented. According to the value of 0.3 for the root mean square error (RMSE), a comparative analysis between the simulation results and their predictions indicates that the LSTM method is suitable for modeling. Furthermore, the LST... [more]
Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine
Yuri Appolonievich Sazonov, Mikhail Albertovich Mokhov, Inna Vladimirovna Gryaznova, Victoria Vasilievna Voronova, Vladimir Valentinovich Mulenko, Khoren Arturovich Tumanyan, Mikhail Alexandrovich Frankov, Nikolay Nikolaevich Balaka
March 9, 2023 (v1)
Keywords: ejector, Energy Conversion, Energy Efficiency, gas dynamics, hydrodynamics, mesh turbine, nozzle, pump
This paper presents a scientific development aimed at improving the efficiency of turbomachines through the joint use of rotary-vane and vortex workflows. In the well-known Euler turbine, the rotor flow channels represent a set of curved pipes. The authors propose to consider in more detail the possibilities of using such rotating pipes in the implementation of an ejection (vortex) workflow. A hybrid pump was considered with the conclusion that its workflow can be described using two Euler equations. The results of computer simulation indicate that hybrid turbomachines are promising. The use of additive technology allowed the creation of micromodels of the Euler turbine with various rotor designs. Laboratory hydraulic tests showed that the liquid inlet to the rotor is possible in pulse mode. Laboratory tests of micromodels using compressed air showed that gas (or liquid) motion through curved pipes could be carried out from the rotor periphery to its center and then back, albeit throug... [more]
Thermal Management Systems and Waste Heat Recycling by Thermoelectric Generators—An Overview
Sadeq Hooshmand Zaferani, Mehdi Jafarian, Daryoosh Vashaee, Reza Ghomashchi
March 9, 2023 (v1)
Subject: Materials
Keywords: Energy Conversion, thermal management, thermoelectric generators, waste heat recovery
With the fast evolution in greenhouse gas (GHG) emissions (e.g., CO2, N2O) caused by fossil fuel combustion and global warming, climate change has been identified as a critical threat to the sustainable development of human society, public health, and the environment. To reduce GHG emissions, besides minimizing waste heat production at the source, an integrated approach should be adopted for waste heat management, namely, waste heat collection and recycling. One solution to enable waste heat capture and conversion into useful energy forms (e.g., electricity) is employing solid-state energy converters, such as thermoelectric generators (TEGs). The simplicity of thermoelectric generators enables them to be applied in various industries, specifically those that generate heat as the primary waste product at a temperature of several hundred degrees. Nevertheless, thermoelectric generators can be used over a broad range of temperatures for various applications; for example, at low tempe... [more]
Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria
Joseph Tauber, Andreas Ramsbacher, Karl Svardal, Jörg Krampe
March 8, 2023 (v1)
Keywords: anaerobic digestion, biological methanation, Carbon Dioxide, Energy Conversion, Hydrogen, methane, renewable energy storage
Biological methanation as a method of sector coupling between electric and gas grids is expected to be an integral part of the green energy change. Wastewater treatment plants (WWTPs) involving anaerobic digestion (AD) allow existing infrastructure to operate as energy conversion plants, to close carbon cycles and to generate long-term storable energy in the form of biomethane. Therefore, municipal raw sludge and additional organic residuals (co-substrates) are converted into biogas. Hydrogen is added to convert the carbon dioxide in the biogas into methane via biological methanation (BM). In this study, the energy amount that is convertible via BM in municipal digesters in Austria was calculated. The amount of energy, which can be transformed from electric surplus energy into biomethane, was assessed. Operational data from lab-scale digesters were combined with data from 28 Austrian full-scale wastewater treatment plants with AD. They represent 9.2 Mio population equivalents (PE), or... [more]
Prospects for the Use of Hydrogen in the Armed Forces
Andrzej Soboń, Daniel Słyś, Mariusz Ruszel, Alicja Wiącek
March 7, 2023 (v1)
Keywords: armed forces, Energy Conversion, energy security, Hydrogen, renewable energy sources
The energy security landscape that we envisage in 2050 will be different from that of today. Meeting the future energy needs of the armed forces will be a key challenge, not least for military security. The World Energy Council’s World Energy Scenarios forecast that the world’s population will rise to 10 billion by 2050, which will also necessitate an increase in the size of the armed forces. In this context, energy extraction, distribution, and storage become essential to stabilizing the imbalance between production and demand. Among the available solutions, Power to Hydrogen (P2H) is one of the most appealing options. However, despite the potential, many obstacles currently hinder the development of the P2H market. This article aims to identify and analyse existing barriers to the introduction of P2H technologies that use hydrogen. The holistic approach used, which was based on a literature survey, identified obstacles and possible strategies for overcoming them. The research conduct... [more]
Process Efficiency and Energy Consumption during the Ultrasound-Assisted Extraction of Bioactive Substances from Hawthorn Berries
Zbigniew Kobus, Monika Krzywicka, Anna Pecyna, Agnieszka Buczaj
March 6, 2023 (v1)
Subject: Biosystems
Keywords: anthocyanins, energy consumption, Energy Conversion, polyphenols, pulsed ultrasound, yield of extraction
This study investigated the impact of sonication parameters on the efficiency of the extraction of bioactive substances from hawthorn berries. The ultrasonic treatment was performed in two modes: continuous and pulse. In the pulse mode, the samples were sonicated with the following processor settings: 1 s on-2 s off. The effective ultrasonic processor times were 5, 10, and 15 min, and the total extraction times were 15 min, 30 min, and 45 min. The content of total polyphenols and total anthocyanins was determined by a spectrophotometric method. We show that the operating mode of the processor affects extraction efficiency, energy consumption and unit energy inputs. Extraction supported by a pulsating ultrasonic field allowed saving from 20% to 51% of energy with a simultaneous higher efficiency of the process. In addition, we show that the unit energy consumption in the pulsed mode was about 40% to 68% lower than the energy consumption in the case of continuous operation.
Novel Interleaved High Gain Boost Converter Using Switched Capacitor
Girish Ganesan Ramanathan, Naomitsu Urasaki
March 6, 2023 (v1)
Keywords: DC–DC, Energy Conversion, interleaved, Renewable and Sustainable Energy, switched capacitor
The increase in global energy demand has led to increased research in harvesting solar energy. Solar energy is widely used in homes, electric vehicles and is a great solution to power remote areas. DC−DC converters are essential in extracting power from solar panels. One of the main problems in designing converters for solar energy applications is boosting the low output voltage of the solar panel to meaningful levels. While there are several topologies to achieve high gain, some of the problems faced by them are the extreme duty ratio, complex design and discontinuous input current. This paper presents a novel topology that uses an interleaved input, a voltage lift capacitor and a hybrid switched capacitor network to achieve high gain without an extreme duty ratio or bulky magnetics. The proposed converter is controlled using a microcontroller which regulates the output voltage. The voltage lift capacitor and the switched capacitor network enhances the voltage gain over a conventional... [more]
Accessible Modeling of the German Energy Transition: An Open, Compact, and Validated Model
Julia Barbosa, Christopher Ripp, Florian Steinke
March 6, 2023 (v1)
Keywords: Energy Conversion, energy system model, energy transition
We present an easily accessible model for dispatch and expansion planning of the German multi-modal energy system from today until 2050. The model can be used with low efforts while comparing favorably with historic data and other studies of future developments. More specifically, the model is based on a linear programming partial equilibrium framework and uses a compact set of technologies to ease the comprehension for new modelers. It contains all equations and parameters needed, with the data sources and model assumptions documented in detail. All code and data are openly accessible and usable. The model can reproduce today’s energy mix and its CO2 emissions with deviations below 10%. The generated energy transition path, for an 80% CO2 reduction scenario until 2050, is consistent with leading studies on this topic. Our work thus summarizes the key insights of previous works and can serve as a validated and ready-to-use platform for other modelers to examine additional hypotheses.
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