Article
Energy & Fuels
J. Singh, H. Nozari, J. M. Herreros, A. Tsolakis
Summary: The study investigated the impact of aliphatic bio-alcohols on on-board thermo-chemical exhaust waste heat recovery, H2 production, and fuel savings in a GDI engine. Iso-pentanol was found to be the most effective bio-alcohol for maximizing heat recovery and reducing carbon emissions under steady state engine operation.
Article
Chemistry, Physical
Arif Karabuga, Zafer Utlu, Behiye Yuksel
Summary: Nowadays, there is increasing global attention on the involvement of green hydrogen in energy transformation. This study conducted thermoeconomic and thermoenvironmental analyses on the integration of an organic Rankine cycle system and a hydrogen production system into a solar collector. The results showed an energy efficiency of 39.01% and an exergy efficiency of 17.37% for the whole system, with CO2 emissions of 71.48 kgCO2/ kWh and a cost of 0.139 $/kgCO2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Chemical
Maria Teresa Munoz Diaz, Hector Chavez Orostica, Javiera Guajardo
Summary: This paper discusses the production, associated technologies, and demand projections of green hydrogen, as well as the current state and strategies of various countries in using this new fuel. It also explores the opportunities for Chile in the export business of this new hydrogen, thanks to its renewable energy production capacities. The study highlights the importance of determining Chile's actual capacities in producing this fuel and optimizes the equipment's capacities to reduce the costs of hydrogen production.
Article
Energy & Fuels
Michael Bampaou, Kyriakos Panopoulos, Panos Seferlis, Amaia Sasiain, Stephane Haag, Philipp Wolf-Zoellner, Markus Lehner, Leokadia Rog, Przemyslaw Rompalski, Sebastian Kolb, Nina Kieberger, Stefano Dettori, Ismael Matino, Valentina Colla
Summary: This study investigates the cost-efficient integration of renewable hydrogen into steelworks for the production of methane and methanol, and explores their economic performance under different parameters. The study identifies renewable hydrogen as the most expensive component in this scheme and emphasizes the need for progress in the hydrogen economy.
Article
Energy & Fuels
Hanfei Zhang, Ligang Wang, Jan Van Herle, Francois Marechal, Umberto Desideri
Summary: Urea has diverse applications but there is a growing need for green urea production. Biomass-to-urea has potential but faces challenges in achieving high carbon conversion rates. Integrated power- and biomass-to-urea processes show promise in enhancing carbon conversion efficiency up to 53%.
Review
Chemistry, Physical
Jeffrey R. R. Page, Zachary Manfredi, Stoyan Bliznakov, Julia A. A. Valla
Summary: Sustainable production of renewable carbon-based fuels and chemicals is a necessary but immense challenge in the fight against climate change. Electrochemical hydrogenation (ECH) is a promising alternative to traditional thermochemical upgrading methods, offering environmental and economic advantages. This review summarizes recent studies on bio-oil upgrading using ECH, focusing on the development of novel catalytic materials and factors impacting ECH efficiency and products.
Article
Chemistry, Multidisciplinary
Yuzhu Chen, Meng Lin
Summary: This study reports a photo-thermo-electrochemical cell that can efficiently convert solar energy into electricity and fuel. By optimizing the cell, the solar-to-electricity and solar-to-hydrogen efficiencies can be increased, providing a promising approach for the efficient use of solar energy and flexible electricity and fuel generation.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Energy & Fuels
Vahit Corumlu, Murat Ozturk
Summary: This paper proposes the design of a new solar power-based multigeneration system for generating hydrogen, ammonia, methane, and other beneficial outputs, and investigates the plant performance and efficiencies through parametric works.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Arne Burdack, Luis Duarte-Herrera, Gabriel Lopez-Jimenez, Thomas Polklas, Oscar Vasco-Echeverri
Summary: In this paper, the techno-economic hydrogen production and transportation costs from Colombia to Europe and Asia were determined using open-source Python tools. The potential of Colombia to produce green hydrogen using renewable energies was highlighted, with estimated prices ranging from 1.5 to 3.24 USD/kgH2 depending on the energy source and year. Colombia has the potential to become a promising hydrogen supplier to Asian and European countries with competitive prices in production and transportation of green hydrogen.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Changgwon Choe, Heehyang Kim, Hankwon Lim
Summary: With increasing concerns for environmental issues, there has been much attention on the transition towards sustainable and alternative energy. This study examines the feasibility of producing synthetic methane, a fuel synthesized from green hydrogen (H2) and carbon dioxide (CO2), and investigates how to make the technology economically viable. The cost estimation for methane production considers different scenarios of H2 production using water electrolysis technologies and renewable energy resources. The analysis reveals the range of production costs for synthetic methane and the dominant factors influencing these costs.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Thermodynamics
Haeseong Shin, Dohyung Jang, Sangdon Lee, Hyun-Seok Cho, Kyong-Hwan Kim, Sanggyu Kang
Summary: In order to solve climate change issues, it is necessary to increase the production of green hydrogen, which has not been actively produced due to economic disadvantages. To ensure the economic feasibility of green hydrogen production, this study analyzes the optimal combination of renewable power sources and water electrolysis types. By considering fluctuating power generation and using actual renewable energy generation data, the study derives accurate hydrogen production efficiency and provides insights into establishing the most efficient green hydrogen production system based on water electrolysis dedicated to renewable power sources.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Environmental Sciences
Christian Moretti, Vikas Patil, Christoph Falter, Lukas Geissbuhler, Anthony Patt, Aldo Steinfeld
Summary: This study analyzes the technical performance, costs and life-cycle greenhouse gas emissions of producing various fuels using air-captured water and CO2, and concentrated solar energy as the heat source. The study found that, in the near-term future, these solar thermochemical fuel production pathways can achieve cost-competitiveness compared to e-fuels, with minimum fuel selling prices ranging from 42-76 euro/GJ. In the long-term future, advancements in technology could further improve the solar-to-fuel efficiency, resulting in even lower minimum fuel selling prices and over 80% greenhouse gas savings.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Panneerselvam Ranganathan
Summary: This study investigates the techno-economic evaluation of renewable fuels production from sewage sludge using hydrothermal liquefaction method. The process design includes wastewater treatment, hydrothermal liquefaction, hydroprocessing, and hydrogen production. A steady-state simulation is conducted to predict mass and energy flow rates, and an economic calculation is performed to obtain a minimum selling price (MSP) of the renewable fuels at $4.04/GGE. Sensitivity analysis shows that biocrude yield and operating cost significantly affect the MSP. This study provides feasibility for large-scale production and guides future plant design/optimization, driving research towards a circular economy.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Review
Chemistry, Physical
Federica Valentini, Assunta Marrocchi, Luigi Vaccaro
Summary: Liquid organic hydrogen carriers (LOHCs) are attractive materials that can generate hydrogen on site for the production of biofuel precursors, fuels, or fuel additives. This comprehensive review article provides an overview of the hydrogen transfer mechanisms for different LOHCs and discusses the importance of catalyst design and reaction condition selection.
ADVANCED ENERGY MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Debarun Banerjee, Nidhi Kushwaha, Nagaraj P. Shetti, Tejraj M. Aminabhavi, Ejaz Ahmad
Summary: Hydrogen, considered as the cleanest fuel, can be produced from various sources, including biomass. Conventional methods for hydrogen production have drawbacks, while photo-reforming of bio-renewable oxygenates has emerged as a promising and green alternative. The rate of hydrogen production via photoreforming depends on catalyst properties, oxygenate structure, operating conditions, and other factors.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Mathematics
Carlo Carminati, Stefano Marmi, David Sauzin, Alfonso Sorrentino
Summary: In this study, the minimal average action for area preserving twist maps of the annulus was considered, showing interesting relations with the dynamics of the system. It was proven that the beta-function associated to a standard-like twist map has a unique C-1-holomorphic complex extension, coinciding with the function on the set of real diophantine frequencies. This led to a uniqueness result for Mather's beta-function.
ADVANCES IN MATHEMATICS
(2021)
Article
Mathematics, Applied
Erwan Lanneau, Stefano Marmi, Alexandra Skripchenko
Summary: In this study, we extend the results by Marmi, Moussa, and Yoccoz on cohomological equations for interval exchange transformations to irreducible linear involutions.
DYNAMICAL SYSTEMS-AN INTERNATIONAL JOURNAL
(2021)
Article
Thermodynamics
M. Rivarolo, D. Rattazzi, L. Magistri, A. F. Massardo
Summary: This paper presents an innovative approach to compare innovative technologies for energy production and storage for maritime applications. Utilizing a developed algorithm and database, the study analyzes various solutions and applies them to case studies to demonstrate potential and reliability.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Chemistry, Physical
M. Cavo, E. Gadducci, D. Rattazzi, M. Rivarolo, L. Magistri
Summary: This study focuses on the integration of PEMFCs and metal hydrides on a zero-emissions ship, emphasizing their thermal coupling. A model-based approach is developed to ensure system feasibility under different load demands, including transient conditions, based on the real application of an innovative zero-emissions ship powered by PEMFC and metal hydrides.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Quantum Science & Technology
Salvatore Tirone, Maddalena Ghio, Giulia Livieri, Vittorio Giovannetti, Stefano Marmi
Summary: This study introduces a semi-classical model that describes a scenario in which the payoff of a gambler is encoded into the internal degrees of freedom of a quantum memory element. The research shows that the optimal gambling strategy for the gambler, under fixed odds and probabilities of winning, is to invest all initial resources into coherent state amplitude.
Article
Computer Science, Information Systems
Tommaso Colozza, Stefano Marmi, Aldo Nassigh, Daniele Regoli
Summary: Market-implied ratings have become increasingly important as efficient early warnings of official credit rating migrations. We have developed a two-dimensional implied rating system based on bonds and CDS spreads, and tested its forecast performances on a set of worldwide sovereign issuers. The method efficiently combines information from both markets and outperforms implied ratings based on recent machine learning techniques.
INFORMATION SCIENCES
(2022)
Article
Mathematics
Paolo Giulietti, Stefano Marmi, Matteo Tanzi
Summary: We prove that skew systems with a sufficiently expanding base have approximate exponential decay of correlations. The fiber maps are assumed to be Lipschitz regular and depend on the base in a way that guarantees diffusive behavior on the vertical component. The assumptions do not imply a hyperbolic picture and cannot rely on the spectral properties of the transfer operators involved. The approximate nature of the result is the inevitable price one pays for having mild assumptions on the dynamics on the vertical component. However, the error in the approximation goes to zero when the expansion of the base tends to infinity.
JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES
(2022)
Article
Mathematics, Applied
Seul Bee Lee, Stefano Marmi, Tanja I. Schindler
Summary: We provide an explicit arithmetical condition for the existence of the unstable manifold in the MacKay approximate renormalisation scheme, addressing the breakup of invariant tori in Hamiltonian systems with one and a half degrees of freedom. Our findings correct earlier results and demonstrate an example where the unstable manifold fails to converge.
PHYSICA D-NONLINEAR PHENOMENA
(2022)
Article
Mathematics, Interdisciplinary Applications
Andrey Shternshis, Piero Mazzarisi, Stefano Marmi
Summary: This study investigates the inefficiency of the ETF market at a 1 min timescale and weekly basis, and finds that the market is not efficient after removing known patterns of regularity. However, the signal is weak.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Physics, Multidisciplinary
Andrey Shternshis, Piero Mazzarisi, Stefano Marmi
Summary: This paper investigates the degree of efficiency for the Moscow Stock Exchange using methods such as filtering financial data and computing entropy measures. The study finds that the market efficiency of the exchange is significantly low for most months between 2012 and 2021. By identifying periods of market inefficiency, potential profitable strategies can be devised, taking into account transaction costs and the sector to which a stock belongs.
Article
Business, Finance
Giacomo Toscano, Giulia Livieri, Maria Elvira Mancino, Stefano Marmi
Summary: We investigate the asymptotic normality of two feasible estimators of the integrated volatility of volatility based on the Fourier methodology. The bias-corrected estimator achieves the optimal rate of convergence, while the estimator without bias-correction has a slower convergence rate and a smaller asymptotic variance. Simulation results support the theoretical asymptotic distribution of the rate-efficient estimator and demonstrate its accuracy compared to a rate-optimal estimator. Using the rate-optimal Fourier estimator, we reconstruct the series of the daily volatility of volatility of two indices and provide novel insight into the existence of stylized facts about the volatility of volatility dynamics.
JOURNAL OF FINANCIAL ECONOMETRICS
(2022)
Article
Business, Finance
Giulio Bottazzi, Francesco Cordoni, Giulia Livieri, Stefano Marmi
Summary: We propose a methodology for company market valuation that replaces the traditional point estimate with a probability distribution of fair values, providing information about the company's expected value and intrinsic uncertainty. Our methodology relies on an econometric model for company revenues and firm-specific balance sheet relations estimated using historical data. Through statistical exercises on publicly traded U.S. companies, we show that our methodology is effective in predicting future abnormal returns at the firm level and provides additional information not accessible through traditional market factors at the market level.
Article
Mathematics, Applied
Riccardo Ceccon, Giulia Livieri, Stefano Marmi
Summary: We study a random version of the population-market model proposed by Arlot, Marmi, and Papini in 2019. The model is based on the Yoccoz-Birkeland integral equation and describes the time evolution of livestock commodities prices with both deterministic and stochastic behavior. By introducing a stochastic component inspired by the Black-Scholes market model into the price equation, we prove the existence of a random attractor and a random invariant measure. Numerical computations of the fractal dimension and entropy of the random attractor show its convergence to the deterministic one as the market volatility tends to zero. The dependence of the attractor on the choice of the time-discretization parameter is also studied.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Mathematics, Applied
Seul Bee Lee, Stefano Marmi, Izabela Petrykiewicz, Tanja I. I. Schindler
Summary: This paper studies functions related to the classical Brjuno function, namely k-Brjuno functions and the Wilton function. They are appeared in the study of boundary regularity properties of (quasi) modular forms and their integrals. The various possible versions of them are considered based on the a-continued fraction developments. The BMO regularity properties of them and their behavior near rational numbers of their finite truncations are studied. Then, the functional equations they fulfill are complexified and analytic extensions of the k-Brjuno and Wilton functions to the upper half-plane are constructed. The boundary behavior of them is studied using an extension of the continued fraction algorithm to the complex plane. It is also proved that the harmonic conjugate of the real k-Brjuno function is continuous at all irrational numbers and has a decreasing jump of p/q(k) at rational points p/q.
AEQUATIONES MATHEMATICAE
(2023)
Article
Mathematics, Applied
Stefano Marmi
Summary: This article presents works of Corinna Ulcigrai closely related to Diophantine approximations, which generalize classical notions to the context of interval exchange maps, translation surfaces, and Teichmuller dynamics.
JOURNAL OF MODERN DYNAMICS
(2022)
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)
