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An experimental set-up of a solar hot water system integrated with the fuel cell heat pertaining to a solar-hydrogen system is built at the RMIT University in Victoria, Australia. The system could validate an earlier theoretical model, to supply power and hot water demand to a remote household in southeast Australia, with the solar-hydrogen sized to meet 100% of the power demand. Experimental results...
This study presents a model for quantifying the performance of primary nozzles within the context of ejectors in the refrigeration systems. The effects of real and ideal gas properties are compared and two equations for the two-phase speed of sound are tested against experimental data for vapor nozzles working with R245fa, N2 and R141b and also a two-phase nozzles processing CO2. Results show that...
A potentially beneficial new opportunity is emerging around the exchange of energy between electric vehicles and the electrical energy grid, particularly as more low-carbon energy sources are connecting to the grid. Accordingly, this paper presents an optimization framework to activate the potential capabilities of electric vehicles equipped with bidirectional chargers for energy conditioning (including...
This paper addresses the impacts introduced on Distribution Transformer (DT) aging due to the integration of nearly Zero-Energy Buildings (nZEBs) into existing Low-Voltage Distribution Grids. The study considers a neighborhood in the Portuguese municipality of Évora where buildings are set to become nZEBs using solar Photovoltaic systems. This transition is reproduced by simulation using real pre-transition...
Unlike other traditional energy resources, wind power outputs depend on natural wind resources that vary over space and time. Accurate wind power forecasting can reduce the burden of balancing energy equilibrium in electrical power systems. In this paper, we propose the short-term probabilistic forecasting of wind energy resources using the enhanced ensemble method. The enhanced ensemble forecasting...
Catalytic deoxygenation co-pyrolysis of bamboo wastes and microalgae with biochar catalyst was investigated in a fixed bed reactor to explore the deoxygenation effect and possible deoxygenation mechanism of biochar catalyst (resulted from bamboo wastes pyrolysis). Results showed that oil fraction yields from co-pyrolysis of bamboo wastes and microalgae decreased largely with biochar addition, but...
This document presents a study into the working fluids that can be used at an Enhanced Geothermal System (EGS) plant as a way of making efficient, large-scale use of the enormous resources offered by geothermal energy.First, we investigate the two working fluids most used in such plants: water (H2O) and carbon dioxide (CO2). The comparative analysis brings to light the advantages of each one, making...
Power generation with porous media driven Micro-Thermophotovoltaic (MTPV) was investigated and effects of changes to key parameters of the system investigated. The micro combustor had the dimensions of length–15 mm, width–10 mm, height–1 mm and wall thickness of 0.5 mm. The distance between the outside wall of combustor and the TPV cell was fixed at 1 mm. Variation in distance from 1 to 6 mm between...
Co-firing coal mine discards with coal in pulverized fuel burners of the current power plants would be a promising way both to reduce the environmental impact of coal production and to energy valorize such residues, with an acceptable economic investment. Changes in fuel blends bring along alterations in flame dynamics and structure which must be considered for successful operation. The paper addresses...
This study is aimed at investigating wind field effect on the power generation and the aerodynamic performance of offshore floating wind turbines. For this purpose, three comparative wind fields are generated: a uniform wind field, a steady wind field with wind shear, and a turbulent wind field. Aero-hydro-servo coupled analysis is performed in time-domain to estimate how a referenced semisubmersible...
This paper surveys controlling, without use of mechanical valves, of flows of three gases: a combustible mixture (fuel and oxidant), combustion products, and a neutral scavenging gas. The gases are delivered periodically in an alternating way into a pair of pulsed MHD electricity generators. Essential problem of this type of electricity generation is insufficient ionisation level of combustion products...
This study first assessed the performance of four global mechanisms, including the Westbrook and Dryer (WD) and Jones and Lindstedt (JL) mechanisms, and two preliminary refined versions of them (WD1/JL1), for predicting coal combustion under moderate or intense low-oxygen dilution (MILD) in a lab-scale furnace. The WD/WD1 mechanisms could predict coal MILD combustion well, while the other two performed...
The current tendency in energy domain is to reduce fuel consumption in favor of sustainable energy approaches. In this frame, the present work suggests an efficient way of heat recovery from boilers using concentric tube. The motivation behind the suggested concept is that it could be considered the cheapest, easiest to construct and simplest to use among all the existing heat recovery systems. In...
This paper proposes an Enhanced Moth-Flame Optimization (EMFO) algorithm for solving the non-convex economic dispatch (ED) problem with valve point effects and emissions. It determines the optimal generation schedule of generating units by minimizing both fuel cost and emission simultaneously while the system constraints are achieved. The moth-flame optimization (MFO) is a recent nature-inspired method,...
The isothermal phase transition process of pure working fluids cannot effectively match the liquefied natural gas (LNG) gasification process, resulting in low efficiency of LNG cold energy power generation systems. In order to improve the temperature matching characteristics, mixed working fluids with a temperature glide during the phase change process can be adopted. In our previous study, the two-stage...
Nowadays due to the permanent increase in energy consumption and its high cost and also nonrenewable energies' destroying effects, clean technologies such as fuel cells should be supported and used. In present study, waste heat recovery of a low temperature proton exchange membrane fuel cell is surveyed using a recuperative organic Rankine cycle. The PEMFC system is equipped with a metal hydride storage...
This paper presents an arrangement of super hydrophobic lateral venting micro channels, which is fabricated around the anode gas diffusion electrode of micro direct methanol fuel cell (μDMFC). Work in this paper is aimed to prove the validity of the lateral venting design. Three types of DMFCs with lateral venting design is tested by contrast with control groups respectively. With the lateral venting...
The electricity consumption forecasting problem is especially important for policy making in developing region. To properly formulate policies, it is necessary to have reliable forecasts. Electricity consumption forecasting is influenced by some factors, such as economic, population and so on. Considering all factors is a difficult task since it requires much detailed study in which many factors significantly...
Numerous independent field research studies, trying to establish actual energy savings when replacing high-pressure sodium (HPS) luminaires with LED ones in street lighting, had serious deficiencies. Therefore, our approach was based on equal photopic or mesopic luminance levels when comparing street lighting installations. In addition, a novel approach, considering energy efficiency indicators of...
A numerical wake model based on the vortex filament method is proposed to predict the velocity deficit in the wake of a horizontal axis wind turbine (HAWT). By solving the evolution of the vortex system behind the wind turbine, the model calculates the distribution of the downstream velocity indirectly with very low computational cost. Instead of the usual scheme of the vortex method, the more efficient...
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