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The examination of exergy transfer characteristics caused by gas-solid heat transfer through sinter bed layer in vertical tank has been presented. Correlations involving relevant variables to predict the mean exergy transfer coefficient, the mean exergy transfer Nusselt number and the non-dimensional exergy flux have been derived by applying the second law of thermodynamics and non-equilibrium thermodynamics...
Accurate information on the temporal and spatial distributions of solar radiation is very important in many scientific fields. In this study, instantaneous solar irradiances on a horizontal surface at 10:30 and 13:30 local time (LT) were calculated from Moderate Resolution Imaging Spectroradiometer (MODIS) atmospheric data products with relatively high spatial resolution using a solar radiation model...
Dynamic price fluctuations in the Alberta electricity market bring potential economic opportunities for electricity energy storage technologies. However, storage operation in the market could have significant impact on electricity prices. This paper evaluates the potential operating profit available through arbitrage operation for a price-maker storage facility in Alberta. Considering a five-year...
In this paper, a comparison of nine supercritical carbon dioxide (S-CO2) bottoming power cycles in conjunction with a topping cycle of landfill gas (LFG) fired 5MWe gas turbine is presented. For the comparison purpose, a sensitivity study of the cycle design parameters for nine different cycles was conducted and each cycle thermodynamic performance is evaluated. In addition, the cycle performance...
One of the main objectives in restructuring power industry is enhancing the efficiency of power facilities. However, power generation industry, which plays a key role in the power industry, has a noticeable share in emission amongst all other emission-generating sectors. In this study, we have developed some new Data Envelopment Analysis models to find efficient power plants based on less fuel consumption,...
External energy security has gained importance within the EU due to the current Russian-Ukrainian natural gas dispute, but also because of mid- and long-term issues connected to the availability of energy supply in Europe. The Energy Union proposal is supposed to increase the coherence of the EU in external energy, thus contributing to the energy security of the Community. However, various member...
Energy assessment of urban buildings has become an active research field due to a large amount of energy consumed in cities as a result of fast urbanization. Hence, it is necessary to determine relative importance of variables for explaining variations of building energy use. However, two commonly used methods (correlation analysis and standardized coefficient) are only suitable for uncorrelated variables...
This paper presents a dynamic model of a Capillary Pumped Loop designed for gravitational applications. The CPL model is divided into subsystems, for which transient mass, energy, and momentum balances have been developed. The heat and mass transfer inside the evaporator structure is precisely described by a 2D mathematical model, which takes into account the existence of a vapor pocket inside the...
The high price of crude oil, strict environmental regulations and ever-increasing demand for energy have made refineries adopt a more holistic approach to integrating energy, economics and environment in their design and operation. Gas flaring is a major factor for the wastage of energy in oil and gas industries that could be better utilized and even generates revenue. Integration and use of wasted...
This study is aimed at introducing new version of DEA compressor and turboDEA, a novel gas turbine cycle that is specially configured to work by this compressor. This paper explains a preliminary study based on computer modeling for evaluating potential of the concept to heighten gas turbine technology. The paper is started by explaining mechanism of DEA compressor operation and its components, and...
This paper proposes a new method for obtaining the maximum power output of a doubly fed induction generator (DFIG) wind turbine. This scheme does not require the precise parameters of the wind turbine or any information about the wind speed or wind sensor. The maximum power point tracking (MPPT) ability of the proposed method is theoretically proven under some certain assumptions. To obtain the required...
This paper construct a CCHP and renewable energy based hybrid energy system driven by distributed energy resources (DERs CCHP). Then, the paper constructs performance indexes from energy, economic and environment. Thirdly, the paper proposes a multi-objective optimization model for DERs CCHP system under four optimization of energy rate (ER), total operation cost (TOC), carbon dioxide emission reductions...
A small scale gas turbine jet engine is analyzed in this study. To understand the performance of the jet engine, experiments are conducted at four different load types (idle, part load one, part load two and full load). According to the load types, the energy and exergy flows of the engine components and the overall jet engine are investigated. Parameters such as specific fuel consumption, fuel exergy...
Recent years have witnessed the ever increasing renewable penetration in power generation systems, which entails modern unit commitment problems with modelling and computation burdens. This study aims to simulate the impacts of manifold uncertainties on system operation with emission concerns. First, probability theory and fuzzy set theory are applied to jointly represent the uncertainties such as...
This paper presents a reconciliation methodology for the diagnosis of energy systems. The methodology is based on the characterization of irreversibilities in the components of an energy system. These irreversibilities can be attributed to malfunctions or dysfunctions. The characterization of irreversibilities as presented here makes possible to reconcile the Actual Operating Condition (AOC) versus...
This paper presented the results of a study to investigate the effect of turbulent inflows on the blade performance of a Horizontal Axis Wind Turbine (HAWT) by employing the experimental measurement at low Reynolds numbers. In order to observe the stall phenomenon, pressures on the rotor surface were measured by a multiport pressure device. Furthermore, for understanding the effects of different turbulence...
Experimental study on dual fuel HCCI-DI stratified combustion mode is investigated with port injection of n-heptane and direct injection of primary reference fuels (PRFs) with different octane numbers from 0 to 100. Firstly, in-cylinder stratifications of mixture concentration, composition, and temperature for this HCCI-DI combustion mode were numerically simulated. The effects of the octane number...
In this paper, a subcritical and supercritical organic Rankine cycle (ORC) are designed to recover exhaust gas waste heat of biogas fuelled combined heat and power (CHP) engine. The CHP engine is located in Belgium and uses biogas as fuel which is produced from the digestion of domestic wastes by anaerobic digestion. R245fa is selected as working fluid. First, the system parameters as net power, mass...
The role of distributed generation (DG) for empowering the performance of the distribution system is becoming better known in the power sector. This paper presents a competent optimization approach based on the Grey Wolf Optimizer (GWO) for multiple DG allocation (i.e. siting and sizing) in the distribution system. The multiple objectives are to minimize reactive power losses and improve the voltage...
Ethanol direct injection plus gasoline port injection (EDI+GPI) is a new technology to utilise ethanol fuel more effectively and efficiently in spark-ignition engines by taking the advantages of ethanol fuel and direct injection, such as the cooling effect and anti-knock ability. A full cycle numerical modelling including both port and direct injection sprays was performed to understand the mechanisms...
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