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The present paper shows an in-depth numerical characterisation of the Jet in Hot Co-flow (JHC) configuration using the Reynolds Averaged Navier-Stokes (RANS) modelling with detailed chemistry. The JHC burner emulates the MILD combustion by means of a hot and diluted co-flow and high speed injection. The current investigation focuses on the effect of turbulent combustion models, turbulence model parameters,...
Solar Photovoltaic (SPV) arrays are networks of many modules interconnected to provide required terminal voltage and current. In field conditions, large PV arrays deliver lower power than array rating. In this paper, sensitivity of modular interconnection schemes in variation of available power from PV array is investigated. The approach involves the development of a computer algorithm that is required...
Immobilized cell technology is a new technique to produce biogas. In the present study, an immobilized mixed-culture reactor (IMcR) in batch-mode operation was used for the production of hydrogen and methane simultaneously from glucose. Several factors, such as glucose concentration, temperature and fermentation time, were evaluated to determine the optimal conditions for hydrogen and methane production...
A probabilistic and analytical model is presented to assess the direct employment generated by power plants, throughout their lifecycles, from when the fuel is being extracted to the decommissioning stage. To represent the majority of regions and countries around the world, this model provides a global, general and probabilistic vision for all the most common kinds of power plants. Direct job creation...
Natural gas (NG), as one fossil fuel with multiple applications, plays a major role in Europe. However, to face global climate change and accelerate the transition to a sustainable society, fossil fuels, such as NG have to be replaced in the long term. The aim of this paper is to evaluate the technical and economic aspects of emerging technology concepts for the production of renewable methane from...
This study reviews the relevant literature on oil price impacts and then applies both asymptotic and bootstrap distribution techniques to model various oil price shocks and to subsequently evaluate their impacts on key macroeconomic variables in Liberia.First, we find that different oil shock measures yield different effects. Second, asymmetries in oil price exist and can be explained by Liberia's...
The configuration, design and operation strategy are the main factors that can affect the technical, economic and environmental performances of combined cooling, heating and power (CCHP) system. In this paper, the operation of a CCHP system with fired heat recovery steam generator (HRSG), electric chiller, absorption chiller and a boiler is classified into one of three scenarios which are determined...
While carbon footprint reduction potential and energy security aspects of renewable and non-renewable resources are widely considered in energy policy, their effects on water resources are mostly overlooked. This research aims to develop a framework for water and carbon footprint analysis to estimate the current and future trends of water consumption and withdrawal by electricity production sectors...
Poverty and lack of access to electricity are highly correlated. In Sub-Saharan Africa, one of the poorest regions in the world, two in every three people have no access to electricity. This paper describes a purpose designed model to explore and project the development in the Sub-Saharan African electricity sector in Baseline and Universal access scenarios. The results provide insight into the role...
Although various Heat Exchanger Network (HEN) synthesis methods have been proposed in the literature, fundamental study for addressing uncertainties arisen from market fluctuations using stochastic variables and parameters is scarce. Such feature certainly adds difficulties to a problem already not straightforward to solve. In that manner, this work adapts a meta-heuristic approach to be able to efficiently...
The entropy generation analysis of two-layer magnetohydrodynamic electroosmotic flow through a microparallel channel is performed in this study. The two immiscible fluid flows are both driven by a combination of electroosmotic force, pressure gradient and electromagnetic force. Under the framework of Debye-Hückel linearization approximation as well as the assumption of thermally fully developed and...
A cradle-to-gate life cycle assessment of rice straw-based synthetic natural gas (R-SNG) production was carried out in this study, and the inventories of rice straw cultivating and harvesting, feedstock transportation, R-SNG facility construction and dismantling, and power consumption (i.e. purchased electricity (PE) scheme and self-supply power (SP) scheme) stages were analyzed. Then, the inventory...
A parametric study on some combustion characteristics was carried out in a natural gas fueled dual plugs SI engine. Mass fraction burned, cylinder pressure histories and combustion durations of the engine were investigated by three equivalence ratio and spark advance for three spark plug configurations. It was found that equivalence ratio and spark plug configurations were more effective parameters...
This experimental study addresses the entropy generation in a circular tube with coiled-wire inserts. The wire inserts were manufactured with an equilateral triangular cross-section and were coiled using a method so that an edge of the triangle was oriented to face the flow direction. The triangle side length of 4, 5 and 6 mm were chosen for the experiment. The coiled-wire inserts were installed with...
The boundary condition models at the inner and outer surface of the furnace wall have been developed taking into account heat transfer due to radiation and convection. The furnace wall temperature has been calculated from the finite element solution to the transient heat conduction equation. The boundary condition model has been validated using measurements on the laboratory furnace. The heat losses...
Dust deposition over Photovoltaic (PV) module’s surface highly influences the PV module performance and decreases the module output power. This paper studied the particle dust deposition over a tilted PV module under different operating conditions. A combined Eulerian-Lagranigian model was used to model the flow and particle phases. The flow was considered turbulent and the v2-f turbulent model was...
Taking the exergy loss minimization as the optimization objective, an optimization model of coking process is established based on the material balance and energy balance. The optimization problem is solved with the practical production data of a coking plant. The minimum exergy loss and the optimal design parameters are obtained. Performances of the mixed coal before and after optimizations are compared...
To establish a systematic and efficient forest bioenergy supply chain management system, most previous related studies did not investigate a system that involves generating two or more types of energy simultaneously, and did not consider the carbon emissions caused by electricity power generation of forest biomass combustion. Consequently, this study addressed the problems regarding the tactical supply...
Many countries have passed governmental action plans to support the installation of renewable energy sources. However, most studies dealing with the optimization of building energy systems neglect a precise modeling of such subsidies, although these subsidies are specifically designed to strongly influence system setups. Therefore, this paper extends a model for the optimization of energy systems...
Optimizing the energy flows of agricultural production is a concern in order to find the most appropriate mix of agricultural inputs, which would in turn minimize energy consumption and maximize energy output. Thus, the aim of this study is to model the energy flows of kiwifruit production in Guilan province of Iran (as a case study) using Artificial Neural Network (ANN) + Genetic Algorithm (GA) modeling...
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