This study presents a new pressure swing adsorption (PSA) configuration using two columns integrated with a tail gas balloon that enables simultaneous production of two high purity products. Two of the four cycle developed were able produce two products, i.e. bio-methane with purity > 97.0 and biogenic CO2 with purity > 99.5 mol%, simultaneously. The energy efficiency of the best cycle is found to

Understanding the regional theoretical wind potential is crucial for wind power planning and construction. Previous studies have faced challenges including inconsistent wind speed data quality, unquantified uncertainties in distribution parameters, and flawed methods for estimating theoretical wind potential. Therefore, this study introduced a Hierarchical Bayesian-Monte Carlo framework that processed

Kinetic and transport parameters in a model of a heat-integrated biomass downdraft gasifier are poorly known and require estimation. The large number of parameters (40) arises from pyrolysis, combustion, and gasification reactions, as well as heat-transfer phenomena inside the gasifier and associated heat-integration system. Due to complexity of the model and the limited available data, only a subset

Internal combustion engines are evolving to attain advanced combustion modes with higher percentage of compression ignition combustion. Homogeneous charge compression ignition is limited by load range and combustion stability, so hybrid combustion modes have emerged as a key research hotspot. In order to optimize hybrid combustion modes, combustion modes should be accurately identified. Therefore,

Micro-scale Organic Rankine Cycles (mORC) hold significant potential for utilizing low-grade heat sources, such as solar energy, geothermal energy, and industrial waste heat. However, the development of efficient, cost-effective expanders remains a challenge. This study introduces a novel Static Shaft Wankel Expander (SSWE) designed and manufactured without valves, allowing the rotating rotor to directly

Fuel cell systems have attracted significant attention in the field of residential energy due to their high efficiency and environmentally friendly characteristics. However, the inherent coupling of its thermoelectric output limits the flexibility of the system to meet diverse residential energy needs. This study proposes a combined heat and power system based on a proton exchange membrane fuel cell

Gas flaring is a significant source of energy waste and greenhouse gas emissions. In recent years, the importance of flare gas recovery has gained substantial attention, leading to extensive research in this field. This study presents the modeling and evaluation of an innovative ejector-based polygeneration system using associated gas to produce LPG, C5+, and methanol. The steam-flare ejector’s geometry

For vehicle fuel cell, its transient behaviors not only directly determine the actual performance of vehicle, but also affect the operation stability and durability of fuel cell. Due to the lack of effective method to detect the transient performance, it is difficult to optimize and control the transient behaviors of automotive fuel cell. To address this issue, a one-dimensional, two phase and non-isothermal

In the rapidly advancing field of energy storage technologies, achieving efficiency and sustainability has become paramount, with adsorption playing a crucial role. This adsorption process benefits significantly from aerogel-based structures due to their inherent porosity and customizable architectures, which facilitate exceptional heat- and mass-transfer capabilities. However, despite extensive research

Since the Industrial Revolution, the globe has witnessed several challenges, and environmental degradation (ED) has become prominent. Thus, to deal with such environmental issues, the world has introduced several initiatives, including the Kyoto Protocol, the Paris Agreement, and the Sustainable Development Goals (SDGs). In such environmental conditions, energy resilience (ER) is performing well in

In order to provide reference data for the detailed design of the first 100 kW pneumatic backward bent duct buoy (BBDB) wave energy conversion (WEC) device ‘WaveLoong’ in China, a series of physical model tests were conducted in a wave flume. The effect of air chamber height, bow bottom plate length, mooring method and wave parameter on the distribution of operational range with high capture width

This study presents a comprehensive approach to optimizing the performance of a hybrid fuel cell (FC) battery powertrain through the development of a systemic energy management strategy (EMS). The strategy is designed with two levels of management and control, aiming to enhance the efficiency, reduce hydrogen consumption, and improve the safety of the powertrain system. The first level involves an

Pumped hydro energy storage is a leading large-scale energy storage technology, effectively mitigating the intermittency and uneven distribution of renewable energy sources. The motivation of this study is to addresses the lack of systematic understanding of cavitation scale effects on energy conversion imbalance and hydraulic instability in pump-turbines, which are core components of pumped hydro

Despite their crucial role in supplying heat and power to universities, industries, and healthcare facilities, many steam-based district heating systems rely on outdated control methods. Among these, multi-central plant districts are particularly challenging due to the complexities of coordinating multiple plants, optimizing load distributions, and managing system downtime. In response, new operational

In this work, the pyrolysis and hydrothermal liquefaction processes were technically and economically evaluated as process alternatives for the valorization of wood waste from the pulp and paper industry. To this end, process simulations were performed in Aspen Plus® v12. A contribution of this article is the presentation of a simulation methodology that allowed the comparison of the two processes

Radiative cooling technology has been demonstrated its effectiveness in various sectors. Rational combine of radiative cooling and evaporative cooling can greatly enhance its passive cooling performance. However, the present combinations generally lack appropriate thermodynamic design guidance, and the performance limitations for different cases are unclear. In this work, we analyzed the heat and mass

Hydrogen demonstrates potential as a renewable energy source for internal combustion engines due to its carbon-free nature and high efficiency. However, the risk of abnormal combustion arises in downsized, turbocharged hydrogen internal combustion engines (H2ICE), particularly manifesting as low-speed pre-ignition and super knock at high loads and high speeds. In this paper, the characteristics of

Polygeneration integrates various systems and processes to produce multiple energy and chemical products, optimizing resource allocation and enhancing efficiency while mitigating resource wastage and environmental pollution. Based on the polygeneration coupling biomass pyrolysis, carbon capture and formic acid synthesis technology, it not only enhances the added value and market competitiveness of

China has been a global leader in energy-efficient solar greenhouse technology thanks to its incredibly low energy input since its inception. This energy-efficient facility provides an important pathway for the sustainable development of agriculture. A comprehensive explanation of the design principles, development process, and production practice effects of energy-efficient solar greenhouses in China

Lignin, an agro-byproduct of lignocellulosic bio-refineries, was utilized as the precursor biomass for synthesizing sulfonated carbon catalysts employed in producing biodiesel from waste vegetable oils. Various synthesis methods were explored, including H3PO4 activation and sol–gel techniques for producing lignin aerogels (LA) and xerogels (LX), to enhance lignin’s porosity. Characterization techniques

Designing an economical and environmentally friendly catalyst for production of biodiesel is crucial yet a challenging aspect for advancing renewable energy applications. To accomplish this, the present research elucidates the fabrication of a highly efficient novel heterogeneous catalyst by utilizing CaO derived from waste chicken eggshells and a metal–organic framework (MOF)@layered double hydroxide

A compound parabolic concentrator (CPC) combined with a vacuum heat pipe forms a solar collector system capable of efficiently converting solar radiation into medium-temperature heat energy. However, conventional all-glass solar vacuum tubes are characterized by high-temperature heat energy retention, significant resistance to heat energy output, and limited frost resistance during colder seasons.

Sustainable electricity production is a key objective for many nations, achievable through hybrid renewable energy systems. This article examines sustainability within the industrial sector by integrating social indicators alongside environmental and economic indicators into the Pareto front solutions of various hybrid renewable energy systems for prioritization. It presents new findings on sustainability

Accurate parameters’ identifications of photovoltaic models is essential for precise simulation and analysis of integrated and standalone photovoltaic systems which is directly influencing performance assessments. Accordingly, this study investigates the procedures of the hippopotamus optimizer for optimal parameters’ identifications of photovoltaic single and double-diode models, as well as the Sandia

Multi-stage centrifugal pumps used as turbines (PATs) are widely applied in energy recovery. To enhance the understanding of the energy conversion characteristics of multi-stage PAT, this study proposes an energy loss evaluation method based on energy transfer, examining energy conversion within impellers and inter-stage transfer to identify energy losses and their impact on efficiency under various

The remote coastal areas face difficulties due to energy shortages and insufficient freshwater resources. To reduce the energy consumption of reverse osmosis desalination in coastal areas, this paper proposes an optimal configuration method of integrated energy system considering heat enhancement and combined operation of low-head seawater pumped storage and reverse osmosis. Firstly, the heat analysis

Growing concerns about greenhouse gas emissions have accelerated research into converting CO2 into valuable products like methanol. Catalytic hydrogenation, utilizing a catalyst in a thermochemical process, offers a promising solution for reducing atmospheric CO2 and combating climate change. However, optimizing operating conditions and selecting suitable catalysts for CO2 to methanol conversion remains

An integrative solid oxide fuel cell combined cooling, heating and power system in green buildings with hydrogen energy of byproduct water enables carbon neutrality transformation. However, underlying mechanisms on capacity sizing of combined cooling, heating and power system devices and its impacts on system techno-economy have not been figured out especially considering dynamic degradation and efficiency

The adoption of hydrogen as a viable alternative for kerosene in the aviation sector has attracted significant attention. However, comprehending the environmental impacts of hydrogen pathways is a complex endeavor that relies on the specific production pathways employed. The aim of this study is to provide a Well-to-Wake analysis by examining the environmental effects six distinct hydrogen production

This study aims to elucidate the mass transfer behavior and reaction mechanisms governing the depolymerization of polyethylene (PE) during hydrothermal processing (HTP). It specifically focuses on the comparative effects of superheated steam (SHS, defined as water heated beyond its boiling point at a given pressure without undergoing condensation) and supercritical water (SCW, formed above the critical

The rapid development of infrastructure in educational institutions needs the inclusion of on-campus renewable power generation to meet the guidelines of governments and international energy agencies. Several studies have evaluated the utilization of solar and wind energy sources with grid power, with the aim of economically integrating clean energy into small-scale applications. The load patterns

A novel system for producing clean hydrogen and pure water is proposed, integrating an autothermal reforming (ATR), a proton exchange membrane electrolysis cell (PEMEC), and a multi-stage flash (MSF) desalination. This system maximizes energy and material utilization, leading to significant energy and cost savings. The ATR-PEMEC-MSF system can produce both blue and green hydrogen, as well as freshwater

Hydrogen stands as a promising energy carrier within the ongoing energy supply transformation, yet its production via electrolyzers remains prohibitively costly. To address this challenge, this paper proposes an advanced equation-oriented process model for a PEM (Polymer-Electrolyte-Membrane) electrolysis system, including the electrolyzer and downstream hydrogen compression, aimed at optimizing the

Hydrogels are widely used in flexible energy storage and human state detection. As environmental protection requirements continue to increase, the degradability of hydrogels needs to be further improved. In this study, by introducing green starch into acrylamide (AM) and tannic acid (TA), the synergistic improvement of degradability, flexible energy storage and intelligent human motion state detection

The escalating demand for sustainable air conditioning systems in buildings has catalyzed the development of green and efficient alternative air handling systems like the integrated photovoltaic/thermal regenerative desiccant cooling system (PV/T-DCS). This study investigates a multivariate optimization strategy for PV/T-DCS tailored for high-density, hot, and humid urban environments. By integrating

With the growing global focus on environmental and energy issues, hydrogen has garnered significant attention as a green energy source. It leads to extensive research on hydrogen production and storage. This study primarily investigates hydrogen production based on the non-catalytic reaction pathways of methane, using molecular dynamics to explore the combustion reaction pathways of methane under high

Horizontal axis tidal current turbine (HATCT), as an effective device for obtaining tidal current energy, has received widespread attention and research. The currents and oblique waves in the ocean can evolve into complex flow fields and greatly affect the performance of HATCT, which is rarely studied, so it is necessary to explore the hydrodynamic characteristics of the HATCT under tidal currents

Cooling tower-assisted ground source heat pump (GSHP) systems have been widely used in the regions where both cooling and heating are required in recent years. However, the issue of system design and management is still under discussion. The ratio of heat removed by cooling tower to the absorbed by the ground would influence the operation performance of hybrid system. This study developed a method

The rapid advancement of 5G technology has significantly accelerated the progression of mobile devices, promoting the evolution of electronic products such as smartphones, tablet computers, and virtual reality (VR) and augmented reality (AR) eyewear towards an increasingly foldable design. However, due to the inherent constraints of spatial and structural characteristics, conventional thermal management

For the buildings with higher moisture loads such as natatoriums, it is essential to regulate the air temperature and humidity accurately during the year-round. However, the conventional dehumidification air conditioning system is still commonly utilized, which requires considerable energy consumption. In this paper, the heat pump-driven liquid desiccant dehumidification system integrated with fresh

The growing development of lithium-ion battery technology goes along with the new energy storage era across various sectors, e.g., mobility (electric vehicles), power generation and dispatching. The need for sophisticated modeling approaches has become a crucial tool to predict and optimize battery behavior given the demand of ever-higher performance, longevity, and safety. This review integrates the

The utilization of waste cooking oil to produce biodiesel is critical for advancing towards carbon neutrality. This study examines the production of first- and second-generation biodiesel from waste cooking oil, highlighting the transition from first-generation biodiesel, which achieved high purity and yield, to second-generation biodiesel through a hydrodeoxygenation-hydroisomerisation process. The

Due to excessive population, urbanization and economic development, energy demand and its subsequent resource utilization and waste generation has increased which leads to environmental and social impacts. Unsegregated household waste or confused waste (CW), a major contributor of municipal solid waste (MSW) possesses the maximum threat to environment. Hydrothermal liquefaction (HTL) with CW as heterogeneous

The oxygen transport resistance of polymer electrolyte membrane fuel cells operated under various conditions (e.g., temperature and relative humidity) was separated into molecular diffusion, Knudsen diffusion, and ionomer film (IF) resistances using the catalyst agglomerate model, dissection of oxygen transport resistance, and distribution of relaxation time analysis. Simultaneously, an analysis of

Carbon-assisted water electrolysis (CAEW), leveraging the carbon oxidation reaction (COR) in place of the oxygen evolution reaction (OER), substantially reduces the energy demand for H2 production. However, CO2 is the primary anode product in conventional CAEW, limiting its practical value. Additionally, mass transfer constraints significantly impact the efficiency of COR in substituting for OER in

To solve the negative environmental problems derived from the transport sector, this study is devoted to realizing a thorough substitution of biomass fuels for petroleum diesel. The spray, ignition, combustion, and emission of pure biodiesel, biodiesel/ethanol blend, and two kinds of biodiesel/ethanol/water triple micro-emulsified fuels were studied through optical visual methods on a constant volume

Waste heat recovery is crucial for reducing energy consumption and carbon emissions. The integration of organic Rankine cycle with absorption refrigeration, vapor compression refrigeration, and compression-absorption cascade refrigeration enables efficient cooling and power cogeneration from waste heat. However, existing studies lack a unified optimization method, a systematic comparison framework

Currently, nearly all literature discussing the performance of a micro pneumatic turbine using computational fluid dynamics (CFD) adopts either single reference frame simulation (SRFS) or multiple reference frame simulation (MRFS), with previously specified inlet pressure, outlet pressure and rotation speed. The overly constrained boundary conditions prevent the simulations from obtaining the turbine

The Lao People’s Democratic Republic (Lao P.D.R) gets more than 70 % of its energy from conventional sources, which emphasizes the urgent need to switch to renewable energy. This study looks at the supply and demand scenario for energy in the Lao P.D.R. The need to reduce carbon emissions and enhance energy security in a country where over 60 % of the population lacks consistent access to electricity

This paper presents a light olefins production plant that hydrogenates carbon dioxide to C2-C4 using green hydrogen and electricity produced from solar and wind energy resources. In this regard, combining Fischer-Tropsch and methanol-mediated pathways on a large scale is analyzed as a new method to increase light olefins production. Additionally, an optimized hybrid renewable energy system comprised

Leveraging the entire solar spectrum in building facades is crucial to achieving zero-energy buildings concept. This study presents a novel multifunctional window (MFW) that combines photovoltaic laminates with a selective liquid filter (SLF) in a mono-glazing system. For a comprehensive assessment of the energy and daylight performance of a standard office equipped with MFW, it has been developed

As integrated energy systems become increasingly complex, their vulnerability to energy conversion units unavailability poses a considerable threat to system resilience and cost efficiency. This research is motivated by the need to address the growing threat of energy conversion unit unavailability and its significant impact on both system performance and operational costs. The development of a comprehensive

Predicting offshore wind turbine wake and output power is crucial for optimizing wind farm layouts and maximizing wind energy production. In recent years, several Computational Fluid Dynamics methods have been developed to predict wind turbine wake and output power and demonstrated good performance compared with traditional analytical models. However, Computational Fluid Dynamics often involve high

Lithium-ion batteries are among the most advanced electrochemical storage technologies and they are critical to the transition to sustainable energy systems. Despite their maturity, different chemistries are characterized by different technical, economic, environmental, and raw materials supply risks, highlighting the need for a comprehensive assessment. Seven lithium-ion battery chemistries were evaluated

One goal for developing proton exchange membrane fuel cells is to increase the volumetric power density, enabling them to compete with internal combustion engines. Hence, this work proposes a novel anode-sharing configuration for a two-unit short stack of proton exchange membrane fuel cells, which effectively decreases the volume of the stack by utilizing one anode gas channel to supply hydrogen to

Shading is one of the most common anomalies in photovoltaic (PV) systems, leading to power loss and hotspot phenomenon. Currently, most works can only realize shading detection but cannot further diagnose the type and severity of shading. This paper proposes an effective method for diagnosing shading types combining I-V curve imaging with two-stream deep neural networks (DNN), and estimating severity

Although numerous studies have investigated semi-mechanistic and semi-empirical modeling methods for proton exchange membrane fuel cell (PEMFC) engine systems, the advantages and disadvantages of these modeling methods have rarely been analyzed and summarized. As a result, it is difficult to identify the most suitable models under different conditions. Moreover, there are opportunities to further develop

A steady-state, isothermal simulation of a 3D high temperature (HT) ion-pair proton exchange membrane fuel cell (PEMFC) model, utilizing a quaternary ammonium biphosphate ion-pair membrane, was conducted in COMSOL Multiphysics for the first time. The performance of the fuel cell was analyzed, in terms of polarization curves, molar gas concentrations, and overpotential breakdown to determine mechanism