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This paper discusses a novel oxy-fuel combustion method named ICRC (internal combustion Rankine cycle) used in reciprocating engines. Pure oxygen replaces air as oxidant for NOx emission avoidance and CO2 recovery. Water is heated up through heat exchanger by exhaust gas, and then injected into the cylinder near top dead center to control the combustion temperature, meanwhile increases the mass of...
Carbon sequestration with enhanced gas recovery (CS-EGR) is a well-known technology for safe and economical Carbon Capture, Utilization and Storage (CCUS). However, there is lack of a robust and comprehensive approach to study the optimization of the CS-EGR process. In this paper, a multi-objective optimization code based on a genetic algorithm is combined with the multi-phase flow solver TOUGH2 for...
In this study, air, steam and CO2-enhanced gasification of rice straw was simulated using Aspen Plus™ and compared in terms of their energy, exergy and environmental impacts. It was found that the addition of CO2 had less impact on syngas yield compared with gasification temperature. At lower CO2/Biomass mass ratios (<0.25), CO2-enhanced gasification showed a lower GSE (gasification system efficiency)...
A passive DMAFC (direct methanol alkaline fuel cell) using CEM (cation exchange membrane) is operated and compared to passive DMFC (direct methanol fuel cell) which is operated in acidic condition. Nafion117 membrane is applied as solid polymer electrolyte membrane for both the alkali and acidic conditions. Sodium conducting membrane is prepared by dipping Nafion117 membrane into NaOH solution. The...
This paper describes the impacts of different types of DR (demand response) activation on TCLs' (thermostatically controlled loads) aggregated power. The different parties: power system operators, DR service providers (or aggregators) and consumers, have different objectives in relation to DR activation. The outcome of this experimental study quantifies the actual flexibility of household TCLs and...
The main objective of the present study is to perform an in-depth exergetic analysis of a double-pass/glazed v-corrugated plate solar air heater based on exergy loss terms. Consequently, the detailed thermal modeling of the given air heater is carried out and validated with literature which shows good agreements. Through an exergy analysis performed with regard to internal/external exergy losses,...
This paper studies four hybrid systems that couple a reference –biomass and photovoltaic– power plant with four different structures of a steam electrolysis system for hydrogen production. The four hybrid plants are initially examined incorporating the same capacity components as the reference plant. The integration of different structures of the electrolysis process results in operational penalties...
In this paper, a numerical study is conducted in order to investigate the effect of pulsation of air flow at the cathode side of Proton Exchange Membrane (PEM) fuel cell with interdigitated flow field. A two dimensional, isothermal, two-phase, unsteady multi-component transport model is used in order to simulate the transport phenomena. The obtained results are discussed in terms of the influence...
Renewable energy, a viable alternative of the world, can overcome the energy crisis that hinders growth of today's economies. The present work includes sizing of hybrid energy system using various energy management strategies. The energy management strategies considered in the present work are cycle charging strategy, load following strategy and peak shaving strategy. The sizing of hybrid energy system...
In this study, a novel method based on Extreme Learning Machine with wavelet transform algorithm (ELM-WT) was designed and adapted to estimate the exergetic performance of a DI diesel engine. The exergetic information was obtained by calculating mass, energy, and exergy balance equations for the experimental trials conducted at various engine speeds and loads as well as different biodiesel and expanded...
A novel reactor reproducing PCB (pulverized coal boiler) environment was used to evaluate the potential of sorbent co-firing and waste co-combustion as cheap retrofitting techniques to reduce SO2 emissions of existing boiler. Several co-feeding tests of coal and CaCO3 and coal and Ca(OH)2 have been performed for a gas residence time around 0.5 s (4 times shorter than PCB). Results show sulfur emission...
In this research, an improved calculational method of ESR (energy saving rate) considering energy adjustments caused by climate effects is presented based on international standards or regulations regarding energy management. The indicator of “general heat-to-electricity ratio” (R) is proposed to illustrate the energy configurations of CCHP (Combined Cooling, Heating and Power) systems and their potential...
In China's fuel consumption rate regulation for passenger vehicles, the vehicle curb weight-based fuel consumption rate targets are specified in a stepped pattern, which is supposed to have considerable impact on automaker's light-weighting strategy. In this study, this impact is quantitatively evaluated based on China's domestic automotive market data. From the cost-effectiveness perspective, this...
A CFD (Computational Fluid Dynamics) model has been developed to study the wind influence and the effect of the return-air conditions on the efficiency of a volumetric receiver which was previously tested. The model validation obtained deviations lower than 5% for the air temperature at the absorber-cup outlet and an average deviation of 5.2% for the thermal efficiency evaluated in the receiver.In...
In this paper, a novel maximum power point tracking (MPPT) technique is proposed to track the maximum power point (MPP) of photovoltaic (PV) systems. The proposed MPPT scheme concurrently uses PV voltage and current deviations to find the MPP of a PV module/array/panel under every condition. A PV system has been built to implement the proposed MPPT technique as a MPPT controller, and experimental...
This paper focuses on modeling and reducing NOX emissions for a coal-fired boilers with advanced machine learning approaches. The novel ELM (extreme learning machine) model was introduced to model the correlation between operational parameters and NOX emissions of the boiler. Approximately ten days of real data from the SIS (supervisory information system) of a 700 MW coal-fired power plant were acquired...
The scope of this paper is to investigate the driving factors of CO2 emissions from electricity generation in all European Union countries (EU-28) during the period 2000–2012. Particular emphasis is placed on the assessment of any potential association between the examined driving factors and major climate and energy policies implemented during the examined period. In addition, the analysis distinguishes...
Battery electric vehicles (BEVs) and fuel cell electric vehicles (FCEVs) are increasingly prevalent in the transportation sector due to growing concerns about climate change, urban air pollution and oil dependence. This theoretical study reports the results of well-to-wheel (WTW) analyses for BEVs and FCEVs in different energy resource and technology pathways in China in terms of fossil energy use,...
Measuring the performance of the energy system of a country is a prerequisite for framing good energy polices. However, the existing indices which claim to measure energy security have limited applicability for developing countries. Energy sustainability is also increasingly gaining importance and countries are keen to measure it to tailor their energy policies. Therefore, the concept of SES (sustainable...
In this paper the integration of the energy production from programmable (biomass, waste) and not programmable (solar, wind) renewable sources is examined as an opportunity for increasing the share of electricity from renewable power plants, in order to overcome the major obstacles to their extensive penetration into the grid. The integration is performed by using hydrogen from intermittent renewable...
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