Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 148 for “"specific energy"”.
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The welfare cost and greenhouse gas emissions effects of sector-specific energy policies
At present climate and energy policy in the US consists of a patchwork of technology and performance standards implemented in different economic sectors and at different levels of government, rather than a more efficient economy-wide carbon tax or cap-and-trade policy. This is evidenced by policies …
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Thermal homogeneity and energy efficiency in single screw extrusion of polymers. The use of in-process metrology to quantify the effects of process conditions, polymer rheology, screw geometry and extruder scale on melt temperature and specific energy consumption
Polymer extrusion is an energy intensive process whereby the simultaneous action of viscous shear and thermal conduction are used to convert solid polymer to a melt which can be formed into a shape. To optimise efficiency, a homogeneous melt is required with minimum consumption of process energy. …
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Modeling the power requirements of a rotary feeding and cutting system
… bevel angle all had significant effects on the specific energy required by the LSCP RFCS when processing cereal straw and alfalfa. The specific energy required by the LSCP RFCS, while processing cereal straw, increased by 0.35 kW∙h/tonne (or 96%) when the sharpness of the counter-knives …
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Energy Intensity Determination in Wood Processing Sawmills
Energy intensity is an important aspect to wood products producing sawmills in the State of West Virginia. This research aims to facilitate the accurate measurement of electrical energy intensity in sawmills by means of energy analysis and diagnostics using various data acquisition devices on …
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Evaluating the effect of operating variables on energy consumption in stirred mills Mussa Lisso.
… applications, conventional tumbling mills are energy intensive. More energy efficient technologies such as stirred mills have been developed and widely used for fine and ultra-fine grinding. In this study, the effects of residence time, solids concentration, impeller speed, impeller type, media …
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Relationship between cutting parameters and bit geometry in rotary cutting
… parameters (cutting force, penetration force, specific energy, specific respirable dust) and the bit geometry parameters (angle of the bit tip, bit tip size and shape of the bit) in order to reduce the amount of specific respirable dust generated and the specific energy consumed in rotary …
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Effect of operating variables on IsaMill™ performance using platinum bearing ores
… design and operating variables on the IsaMillTM specific energy and product size, when grinding UG2 platinum-bearing ore. The main objectives of this work were to study the effects of operating variables on specific energy consumption and product fineness, and to investigate IsaMillTM scale-up …
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Effect of rate of sumping on fragmentation process in laboratory rotary cutting simulator
… improve sumping. Research has demonstrated that specific energy and specific respirable dust must be kept minimum to produce the optimum parameters of the rock/coal breakage process and to attain maximum sumping. There are three major elements affecting the efficiency of the cutting head namely: …
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Proton Exchange Membrane Electrolysis Applied to the Dehydration of Cow Milk
… milk solids. Although the thermodynamic specific energy of electrolysis at [mathematical notation] is high compared to existing thermal methods around [mathematical notation], experimental results for PEM electrolysis assisted by mechanical centrifugation suggest a specific energy closer …
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Synthesis and characterization of high-performance supercapacitor devices based on carbon/MnO2 composite and carbonized iron cations adsorbed onto polyaniline/nickel graphene foam
Due to the increasing demands for energy-storage systems, supercapacitors (SCs) have received significant attention due to their properties/electrochemical performance. Many research papers and technical reports on the development of electrochemical supercapacitors have been published in recent …
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Mass Minimization of DC -Dc Converters in Portable Electrical Energy Sources
… a methodology for optimal design of portable energy-source systems, leading to an increase in specific energy density. The interaction between the source and converter is considered, which can result in a different system design than when the components are considered separately.
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Crashworthiness capability of jute and glass fibre reinforced epoxy tubes under quasi-static loading condition for automotive application
… the potential utilization of jute in the crash energy absorption. A combination of hand layup and vacuum bladder technique was kused to search the influence of utilizing jute fibre on crashworthiness parameters of composite materials. To improve the mechanical properties, jute fiber was …
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Studies of Sulfur-based Cathode Materials for Rechargeable Lithium Batteries
… to meet the ever-increasing desires of global energy storage market. This thesis is focused on two sulfur-based cathode materials ranging from inorganic lithium sulfide to organotrisulfide. For lithium sulfide cathode, we developed a nano-Li2S/MWCNT paper electrode through solution filtration …
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Fine-grinding Characterisation of PGM Ore Using HIGmill
… minerals. Conventional mills have proven to be energy inefficient when they are used for fine grinding. Energy efficient technologies, such as stirred mills, are therefore being introduced to the minerals market for use in fine-grinding applications. The HIGmill is an example of a stirred mill …
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PV-powered membrane system control for continuous autonomous water solution in remote areas
… volume and quality, as well as increased specific energy consumption. The primary aim of this research is to incorporate mechanical energy storage and develop a hydraulic buffering control method to enhance system performance under varying SI conditions. To achieve this, a hydraulic energy …
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Monovalent selective electrodialysis : optimizing energetics for desalination and mineral recovery
… The model was then used to predict selectivity, specific energy consumption, and second law efficiencies for different system conditions. An optimization study was also carried out to determine the optimal operating parameters for the MSED system. The optimized system led to a decrease in …
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Speed and Temperature Effects in the Energy Absorption of Axially Crushed Composite Tubes
… and are capable of exhibiting high levels of energy absorption, particularly when related to the material mass involved. Polymers are known to display viscoelastic behaviour and polymer composites are similarly sensitive to test speed and temperature. Energy absorption in tube crushing has …
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Low Stress Mechanical Properties of Hydroentangled Fabrics
… properties. It was established that if the specific energy applied remains constant, the jet profile used to apply the energy influences low stress mechanical properties. In general, alternating injectors (face and back) gave the most acceptable combination of low stress mechanical …
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Development of the selective-shear coagulation process for ultrafine coal cleaning
… such as particle size, percent solids, and specific energy input, were studied. It was found that separation efficiency improved with decreasing particle size. An optimum feed percent solids was found by maximizing separation efficiency. In the case of distilled water, test results revealed …
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Numerical Modeling of the Energy Release of Aluminized Oxyacetylene Detonations
This research explored the energy release of pure oxyacetylene and aluminized oxyacetylene detonations and their blast efficiency. A numerical model was developed using blastFoam to accurately capture shock wave parameters using a compressed gas balloon method. For this method, the explosive was …
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