The high theoretical capacity around 1672 mA h g−1 and the energy density of 2567 Wh kg−1and addition advantages of the low cost and environmental benignity, make lithium-sulfur batteries (LiSBs) next generation battery. However, due to restrictions on the low conductivity of sulfur and soluble polysulfides during discharge, electrochemical performance of the batteries is deteriorated. Heteroatom doped

Hydropower is the renewable energy with the highest power production worldwide. At the same time the output flow of the water that is being used for hydroelectric power production can fluctuate significantly. The ability to “recharge” the dams with water from excess variable renewable energy technologies (VRE) can be used for storage and as a buffer for smoothing the production peaks of VRE. This study

Grid integration of photovoltaic (PV) system with a hybrid energy storage can help not only in increasing more penetration of PV system into the network but also in improving the power system dynamics and control in addition to helping the demand side management. In this work, a PV system with a hybrid energy storage including a battery array and a super capacitor bank is going to work as an active

The potential of Humidified Enriched Air (HEA) on Diesel engine combustion is investigated, by means of 3D CFD combustion simulations, on a current production 4-cylinder turbocharged Diesel engine. HEA is supposed to be obtained by water degassing operation, exploiting the different vapor-liquid equilibria of it main constituents, nitrogen and oxygen. Simulations are carried out using a customized

Gasification is an enhanced thermal technique, as it affords a versatile synthetic gas (syngas) from which it is possible to obtain various commodity assets such as electricity, fuels and chemicals while conveniently disposing of biomass or waste residues. To the best of the authors’ knowledge, there are no publications thoroughly relating syngas quality features with its possible applications. The

The increasingly severe environmental crisis has become one of the most important issues of international debate at present. The acceleration of environmental problems places considerable pressure on individuals, governments, and policymakers. Greenhouse gas emissions caused by fossil-based energy sources have made clean energy sources, such as renewable energy, a strategic choice. Although renewable

The aim of this paper is to experimentally and numerically study a coupled-pitching hydrofoil under the fully activated mode. In the experimental study, the operating zones for the energy-releasing state and the energy-capturing state were identified. The phase relationship between the hydrodynamic torque and the angular velocity, which is determined by the combination of the primary and secondary

In this study, computational fluid dynamics (CFD) was applied for simulating the hydrodynamics and chemical kinetics for the fluidized bed biomass fast pyrolysis. Based on the Euler-Euler multiphase framework, standard K-ε model and Finite-Rate/Eddy-Dissipation model were selected for the viscous and the species transport model, respectively. Syamlal O'brien model and Arrhenius kinetic model were chosen

In this study, biodiesel was synthesized from a reaction of waste cooking oil (WCO) and methanol in the presence of catalyst which was derived from chicken bone and coconut residue in a packed bed reactor. Calcium oxide (CaO) was extracted from calcined chicken bone and nano-crystal cellulose (NCC) was isolated from coconut residue by acid hydrolyzed and were supported with polyvinyl alcohol (PVA)

Among the different devices designed to extract energy from waves, the Oscillating Water Column (OWC) operating an air turbine has been one of the most studied in recent years. The aim of this paper is to study the polytropic exponent associated to the thermodynamic process that takes place through the turbine in a non-idealised environment. A real gas model is applied, considering the influence of

Mediterranean islands have the advantage of favourable climatic conditions to use different marine renewable energy sources. Remote sensing can provide data to determine wind energy production potential and observational activity to identify, assess and detect suitable points in large marine areas. In this paper, a new combined model has been developed to integrate wind speed assessment, mapping and

Experimental tests of a small polygeneration plant unit based on hybrid renewable energy and desalination have been used to validate a novel model simulation of this plant. It provides electricity by coupling photovoltaic/thermal collectors and a micro-wind turbine, fresh water by means of hybrid desalination (membrane distillation, and reverse osmosis), and sanitary hot water coming from the photovoltaic/thermal

This study is dedicated to the quantification of biomass potential in India. Therefore, the estimation of quantity of biomass and its potential for energy and biofuel production is needed to calculate. Two categories of biomass i.e. energy crops and agroforestry residues are considered in this study. Only marginal land is taken under consideration for growing energy crops. The bottom-up approach is

In most power systems, residual costs (including, but not limited to, residual network costs and renewable support costs), are allocated through volumetric charges. This design, whose inefficiency has been latent in the last decades, is being challenged by the deployment of distributed energy resources, through which high-consumption customers may dramatically reduce the share of residual costs they

The experimental testing of a Tension Leg Platform (TLP) floating wind turbine at 1:60 scale in wind and waves with a pitch-regulated 10 MW wind turbine is presented. The floating wind turbine was tested with three different control configurations: two closed-loop controllers and one open-loop controller. The experimental setup and program is described in this paper, and system identification and the

In the present research, the performance of a prototype tidal turbine is evaluated via towing tank tests. The examined model is a three-bladed horizontal axis with a 1.15 m diameter. Previously, we studied the hydrodynamic behavior of this turbine and calculated the hydrodynamic coefficients using a numerical approach. Thus, this work concentrates on overwhelming the challenges, from manufacturing

The accurate prediction of airfoil polars over the whole range of angles of attack and for different Reynolds numbers is pivotal to ensure an accurate prediction of wind turbine aerodynamic performance. In particular, modeling correctly the deep-stall and post-stall airfoil behavior is essential to reproduce reliable power and thrust curves for high wind conditions, especially as far as stall-controlled

Micro-hydropower has been highlighted as a potential technology suitable for installation in irrigation networks to reduce system overpressures and to reduce the net energy consumption of the irrigation process. However, the full impact of this technology on a large regional scale is unknown. Artificial Neural Networks and regression models were used in this research to predict the energy recovery

Scenario parameters of aerogel glazing systems are with uncertainties in the real operation, whereas current literature fails to characterise the thermal and energy responses regarding stochastic scenario uncertainties. Furthermore, multi-level uncertainty-based optimisation has been rarely studied for the robustness improvement. In this study, a general method for stochastic uncertainties-based optimisation

In the present work, the tip leakage vortex (TLV) in a mixed flow pump as turbine at pump mode is decomposed and reconstructed by Dynamic Mode Decomposition (DMD) for the first time. The flow field is solved by the k-ω SST turbulence model with validation of experimental data. The unstable primary tip leakage vortex (PTLV) can be mainly classified as two parts, oscillating PTLV-A and shedding PTLV-B

Surge motion of a floating wind turbine can lead to conditions where the rotor moves backwards faster than the wind, leading to propeller-like conditions or vortex ring state (VRS). The effect of surge on the thrust of a floating turbine was investigated with OpenFOAM for conditions favourable to propeller and vortex ring state. Due to lower blade velocities and larger blade twists, a region of negative

With the breakthrough of daytime radiative cooling, more and more efforts have been devoted to this promising technology. However, most of the studies are conducted in arid mid-latitudes, and few reports in humid areas fail to achieve effective cooling. This technology seems difficult to extend to humid low latitudes. To explore the radiative cooling performance in low latitudes, this work sought out

A one-year numerical simulation of a solar wood dryer with glazed walls in a Moroccan climate was developed. This simulation was used to predict detailed and temporal distributions of wood moisture content (MC) and to study the mechanisms and parameters involved in solar wood drying. Calculations were performed for thuya wood (Tetraclinis articulate), which is primarily used in marquetry in the city

This study proposes a PCM enhanced ventilated window (PCMVW) system for ventilation preheating/precooling purposes for building energy conservation. It is designed into a summer night cooling application and a winter solar energy storage application using different control strategies. An EnergyPlus model of the PCMVW is built to investigate the control strategies. Next, a full-scale experiment is conducted

Influences of biomass leachate (BL) additives (rice straw leachate(RSL) and corn straw leachate(CSL)) on reactivity characteristics and structural evolution of petroleum coke (PC)–CO2 gasification were investigated. Specific reactivity (SR0.9) was proposed to quantify influence of BL on PC char gasification and the results demonstrate that BL facilitated PC char gasification and RSL showed more obvious

The economics of wind and solar generation face two opposing drivers. Technological progress leads to lower costs and both wind and solar have shown dramatic price reductions in recent decades. At the same time, adding wind and solar lowers market electricity prices and thus revenue during periods when they produce energy. In this work, we analyze these two opposing effects of renewable integration:

Utilization of biodiesel which is of renewable in nature was enhanced in single cylinder, 4-S diesel engine based on combustion, performance and emission analysis. Esterified jatropha biodiesel (EJO) at 4%, 10% and 20% was added in normal diesel by v/v ratios to form B04, B10 and B20 blends. The crown surfaces of piston, cylinder head and valves were coated with 250 μm thick mullite material (Metco

Torrefaction or hydrothermal carbonization processes were compared for conversion of olive pulp into metallurgical reducing agent. The dependence of yield, CO2 reactivity, and mechanical properties to reaction time and heat treatment temperature was investigated. Hydrochar yield increased with increasing residence time and the maximum solid yield was observed for a residence time of 15 h. On the other

This study analyses energy transition pathways for the case of Bangladesh. The LUT Energy System Transition model, a high temporal - spatial resolution linear optimisation tool, is used to model an energy system transition from 2015 to 2050 for the case of Bangladesh. Four scenarios aimed at analysing different energy policies were created in order to replicate the present and alternative renewable

Photovoltaic power generation application with advantages of sustainability and low emission is limited on its low photovoltaic (PV) efficiency mainly due to high panel temperature. In this paper, a solar photovoltaic system coupled by ground heat exchangers (PV-GHEs system) is proposed to reduce the operation temperature of panels and keep a high PV efficiency. Taking Tikanlik with typical arid climate

Increasing concerns about energy shortage and environmental pollution revealed the necessity to fully use the limited electric power. For this purpose, a lot of researches have focus on establishing household power consumption model. Currently, most existing models are setting one sensor for each appliance. However, the prediction precision of such kind of multi-sensors-based models cannot fully satisfy

Stand-alone photovoltaic systems usually use batteries to adjust energy yield to energy demand. An alternative energy storage system for stand-alone photovoltaic installations is proposed for three cooling applications: air conditioning, food preservation and freezing. A thermally insulated storage tank with ammonia in saturated mixture phase is integrated into the vapour-compression cooling cycle

The operating temperature of bifacial photovoltaic (PV) module affects its power generation and reliability. Combined with view factor model of ground reflectivity on module backside, a thermal steady-state model is established to analyze the thermal performance of bifacial module in this paper. The module operating temperatures under three different installation conditions of roof cement ground, water

Riblets are a passive flow control method, which can be used for drag reduction, especially with small wind turbines that have a low Reynolds number. Riblet manufacturing, however, is a challenging task and the required production quality can cause extra barriers in terms of time and costs. If a relatively low-quality riblet structure could be successfully utilized in airfoils, it could enable wider

The effects of vacuum freeze drying (VFD) pretreatment on poplar (PP), switchgrass (SG), and wheat straw (WS) biochar properties were studied in a muffle at air atmosphere with varied final pyrolysis temperatures (300, 500, and 700 °C). Conventional drying (CD) was used as control. As final pyrolysis temperatures increased, biochar yields from both CD- and VFD-pretreated PP, SG, and WS decreased, and

Cobalt and nickel-based catalysts were synthesized by the co-impregnation method of the ceria support with aqueous solution of the active phase and promoter precursors and evaluated in steam reforming of ethanol (SRE) reaction. The stability of Co/CeO2 and Ni/CeO2 catalysts was effectively improved by the addition of ∼2 wt% of La2O3 promoter as the carbon deposition rate was reduced which results from

Based on the survey data onto rural households in China, taking biogas produced by crop residues as an example, this paper analyzed rural households' perceived value of energy utilization of crop residues. Then, “interpersonal trust” and “institutional trust” variables are introduced to improve Zeithaml's perceived value model to explore the key factors influencing rural households' perceived value

This paper proposes an electronic wind turbine emulator (EWTEm) platform involving the dynamic models of the wind turbine (WT), permanent magnet synchronous generator (PMSG), and turbine-generator mechanical coupling, such that a real WT can be emulated for distinct kinds of loads and wind profiles. Low implementation cost represents an advantage for the proposed EWTEm, followed by its versatility

The researches previously accomplished have been focused on design analysis, performance comparison and improvement of hydrocyclones for general applications and comprehensive results have been achieved. For the present research, an open loop experiment setup has been developed to study the feasibility of hydrocyclone separator as a pre-filtering device for sediment laden hydraulic turbine. The experimental

Lignocellulosic biomass was converted into hierarchical porous carbon by using a physical activation technique under a carbon dioxide environment. Both direct and indirect CO2 activation routes were utilized to investigate the effect of processing parameters and the kinetics of the activation. The porosity, surface chemistry, and morphology of the activated carbons were characterized in addition to

One of the key factors affecting progress of renewable energy (RE) in the residential sector in Africa is the unavailability of net-metering systems in many of its member-state countries. Huge battery storage would have to be put in place by individual households owning solar home systems (SHS) to store energy for early morning and night-time use, making the systems not cost-competitive. In this study

The geometric nonlinear problem caused by large deformation and the aeroelastic issue under extreme wind conditions are becoming more and more prominent, as the flexibility of wind turbine blades enhances. To solve this problem, a model of Blade analysis with Multi-Body (BaMB) method is built by the rigid multi-body dynamics method in absolute coordinates. The model describes geometric nonlinearity

In this article, we propose a model of wind speed on a scale of seconds based on a parametrization of the Ornstein-Uhlenbeck (OU) process, that allows the characterization of wind turbulence. The determination of the accurate parametrization of the OU process that best fits the standard deviation of the wind speed follows the physical principle of wind, which states a relationship of proportionality

The emission characteristics of particulate matters from a full-scale biomass-fired power plant equipped with bag filters were investigated. Results show that particle size distribution at the inlet of bag filter from the combustion of blended feedstocks is bimodal, while that of dry bark feedstocks is essentially unimodal with negligible emission of coarse particles with diameter in the range of 1

In the present work, the thermal performance of impinging jet double pass solar air heater is investigated experimentally. A corrugated wavy plate consists of circular holes, each of 7.66 mm in diameter on the crest region are used to provide the impinging jets of air that provide 1.4%–0.48% plate perforation. While, the double pass is provided by circulating the air first through the channel formed

In the present study, electrocoagulation (EC), alone or in combination with precipitation or centrifugation, was assessed as a potential pretreatment method for enhanced production of biofuels from 3-phase decanter olive mill wastewater (OMW). Experiments were performed using undiluted and diluted OMW in an EC reactor, operating with a current of 2 A and either Al or Fe electrode materials. Subsequently

In the first part of this study, correlation between MERRA-2 reanalysis wind data and ground data is assessed for 12 selected locations. The correlation coefficient ranges from 0.17 to 0.75 among the sites. Sites with higher average wind speeds show comparatively stronger correlation. Besides, site specific factors are also investigated. In the second part, wind energy potential at same 12 locations

This study aims to investigate the performance and economic benefits arising from the integration of concentrating solar power (CSP) plants with anaerobic digestion processes. To demonstrate the capabilities of hybrid CSP-biogas plants, the CSP section of the Ottana solar facility (Italy) is considered as a case study. A simulation model for the performance analysis of the hybrid system is developed

The application of wind power interval prediction for power systems attempts to give more comprehensive support to dispatchers and operators of the grid. Lower upper bound estimation (LUBE) method is widely applied in interval prediction. However, the existing LUBE approaches are trained by meta-heuristic optimization, which is either time-consuming or show poor effect when the LUBE model is complex

Small-scale or scaled-down wind turbines for model experiments mostly operate in low-Reynolds-number flow. The nonlinear variations of aerodynamic coefficients with respect to the angle of attack caused by viscous effects and laminar boundary layer separation affect the wind turbine performance under these conditions. Although the vortex lattice method (VLM) is an efficient way to predict rotor performance

This paper brings together the benefits of hydrogen and battery storage devices in the electrical network integrated with solar energy. The introduced hybrid storage system is utilized to achieve two purposes including uncertainty leveling and energy arbitrage. The volatility of solar energy and electrical-thermal loads is developed by Normal distribution. The hydrogen storage system is designed to

Site selection plays a vital role in the entire life cycle of solar farm and merits further consideration. Current studies for the site selection have several limitations. First, application of criteria related to infrastructure in the initial phase can screen out prospective solar farms or make them less desirable. Second, infrastructure criteria are less significant in circumstances where new cities

An efficient storage retains thermal stratification and improves the discharging performance. Turbulent mixing between hot and cold water is the prime source of stratification destruction. In this paper quantification of turbulent missing was achieved on the basis of temperature profile, MIX number, and Richardson number. The evaluated parameters include flow rate, ΔT, and diffuser design, henceforth

While previous studies focused on managing charging demand for private electric vehicles (EVs), we investigate ways of supporting the upgrade of an entire public urban electric taxi (ET) system. Concerning the coexistence of plugin charging stations (CSs) and battery swap stations (BSSs) in practice, it thus requires further efforts to design a holistic charging management especially for ETs. By jointly