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Renewable energy (RE) is regarded as the main part of the primary energy in the forthcoming “energy internet”. However, the intermittence and variability of renewable energy limit its present penetration. To study the effect of the renewable energy penetration on power supply and demand, a dynamic distributed multi-energy generation system combining RE, natural gas (NG) and energy storage was built...
This paper proposes a bi-probability-interval optimization (BPIO) model for wind-solar power day-ahead scheduling (WSP-DAS) under uncertainties, which aims to obtain the optimal trade-off planning by balancing profit and risk brought by uncertain wind power and solar power penetration. First, the confidence intervals of wind power and solar power are formulated under given confidence levels of wind...
This paper presents a new Total Site Heat Integration utility temperature selection and optimisation method that can optimise both non-isothermal (e.g. hot water) and isothermal (e.g. steam) utilities. None of the existing methods addresses both non-isothermal and isothermal utility selection and optimisation incorporated in a single procedure. The optimisation affects heat recovery, the number of...
Liquid-separated condensation is an emerging enhanced heat transfer method that simultaneously increases the condensation heat transfer coefficient and reduces the pressure drop. This method was applied to shell-and-tube condensers used in organic Rankine cycle systems. The optimized liquid-separated thermodynamic states of organic fluids which maximize the average condensation heat transfer coefficients...
Zinc oxide (ZnO) nanorods (NRs) are very attractive for various applications such as new generation solar cells, photoelectronic devices, laser diodes (LDs) and light emitting diodes (LEDs). ZnO thin films were prepared with various substrate temperatures by the ultrasonic spray pyrolysis (USP) deposition method on glass substrate. The effect of substrate temperature on the structural, morphological,...
Natural gas is an important primary energy carrier and plays an important role for the energy supply. The growing liquefied natural gas (LNG) market enables more flexibility in the entire natural gas market. In the regasification terminal, the LNG is regasified, stored and finally distributed to the gas grid. Usually, the low-temperature exergy of the LNG is destroyed while regasified. Alternatively,...
China is a large developing and transitional economy with substantial regional gaps and high trade openness. However, to our knowledge, the existing studies do not capture the regional impacts of climate policies promoting non-fossil fuels in China. To fill this gap, this study develops a new multi-country multi-region computable general equilibrium (CGE) model, with detailed energy disaggregation...
Hydrogen is a promising alternative of clean energy carrier which can be biologically produced from glycerol-rich waste an abundant and economic source of substrate. However, continuous hydrogen-producing systems still need to be improved and in particular by manipulating the only few available operating conditions. The aim of this study was to investigate the effect of the two main operational parameters,...
Hydrogen delivery is a critical contributor to costs, emissions, and energy consumption associated with hydrogen pathways involving central plant production. Pipeline transmission appears to be the most economical means of transporting large quantities of hydrogen over great distances. The aim of this study is to analyze H2 compression and pipeline transportation processes with safety issues related...
Methanol has been injected at the intake port with heated inlet air in a diesel engine. In the meantime, the Taguchi methodology was adopted to estimate the optimal methanol-energy-share ratio, methanol injection timing, and inlet air temperature. The injection timing and the quantity of methanol were controlled by an ECU (electronic control unit) on an electronic injector. The inlet air temperature...
In this study we discuss hydrodeoxygenation (HDO) of pinyon juniper (PJ) catalytic pyrolysis oil over Ni/SiO2Al2O3 catalyst in a batch reactor to improve the physicochemical properties of the oil. The influence of temperature (350–500 °C), reaction time (15–90 min), and initial hydrogen pressure (3.5–10 MPa), on hydrodeoxygenation of PJ pyrolysis oil was investigated. After hydrogenation was completed,...
Shrub lands could provide an almost unexplored biomass resource of increasing potential in the EU, particularly in Mediterranean countries. Its collection and transformation into solid biofuels will help to reduce the adverse effects associated with frequent shrub land fires. The objective of this study is to examine the pre-treatment and combustion of biomass obtained from broom plant clearings to...
Computed tomography (CT) was used to scan the samples obtained from devolatilization in a turbulent fluidized bed combustor (FBC). The evolution of three-dimensional shrinkages at different residence time was measured and visualized successfully without destroying the sample. The effects of the bed temperature, and the fuel species on the mass conversion, devolatilization time, and shrinkage characteristics...
The prime focus of this study is to explore the influence of fossil fuel consumption, electrical energy consumption, oil-based imports, and expansion of urbanization on the environmental degradation experienced in developing economies of Latin America and the Caribbean (LAC). This study has applied a system Generalized Method of Moment with a two-step estimator involving a panel of twenty middle and...
The demand for purified hydrogen as a new green energy source has dramatically increased during last years. In this study, different -Matrimid®- Deca-dodecasil 3R (DDR) type zeolite mixed matrix membranes were synthesized for Hydrogen purification from Methane. Results demonstrated that existence of DDR into the Matrimid® matrix, as well as, high temperature thermal treatment enhances membrane crystallinity...
Nowadays, the integration of uncertain renewable resources has been accelerated, which encounters the operational scheduling of power system with some challenges for achieving optimal operation schedule. Hence, uncertain resources will be penalized if they create an imbalance in power generation. Both of the positive and negative imbalances will lead to a decrease in the uncertain resources' profitability...
The building industry in China is energy-intensive, and promoting energy efficiency improvements and energy savings in this sector is of vital significance for its sustainable development. Using a proposed meta-frontier DEA approach, this paper investigates the key factors responsible for changes in the economy-wide energy efficiency and the sources of both energy inefficiency and energy-savings potential...
Biogas upgrading to synthetic natural gas (SNG) is a viable and appealing route for power-to-gas because it combines waste management with the use of the surplus electricity that might arise in energy systems having a considerable share of renewable energy sources in their production mix. In this work, the exergo-economic performance of a biogas upgrading process through integrated electrolysis and...
The operation characteristics of a 10 kW organic Rankine cycle using R245fa and adapting stand alone and grid connect operation strategies have been investigated. The heat input increases from 34.18 to 87.40 kW for stand alone and from 53.37 to 112.76 kW for grid connect operation strategy, while degree of superheating and subcooling are fixed at 9.5 ± 0.5 and 7 ± 0.5 °C, respectively. The detailed...
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