Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 10 of 10
Full-Text Articles in Engineering
Investigating The Impacts Of Conventional And Advanced Treatment Technologies On Energy Consumption At Satellite Water Reuse Plants, Jonathan Roy Bailey
Investigating The Impacts Of Conventional And Advanced Treatment Technologies On Energy Consumption At Satellite Water Reuse Plants, Jonathan Roy Bailey
UNLV Theses, Dissertations, Professional Papers, and Capstones
With the ever increasing world population and the resulting increase in industrialization and agricultural practices, depletion of two of the world's most important natural resources, water and fossil fuels, is inevitable. Water reclamation and reuse is the key to protecting these natural resources. Water reclamation using smaller decentralized wastewater treatment plants, known as satellite water reuse plants (WRP), have become popular in the last decade. With stricter standards and regulations on effluent quality and requirements for a smaller land footprint (i.e. real estate area), additional treatment processes and advanced technologies are needed. This greatly increases the energy consumption of an …
Modeling Biofuel Production In Southern Pine Forests: The Effects On Soil Properties, Brittany L. Oakes
Modeling Biofuel Production In Southern Pine Forests: The Effects On Soil Properties, Brittany L. Oakes
Honors Theses
From consuming energy alone in 2009, the United States ranked second as a carbon emitter at 5,425 million metric tons annually; China was the leader at 7,706 million metric tons and India placed third at 1,591 million metric tons (EIA, 2010). Yet in 2009, the U.S. consumed more electricity than both China and India and was the leading importer of electricity (EIA, 2010). Incorporating more domestic sources of renewable energy can simultaneously alleviate two issues: mitigating climate change catastrophes and significantly reduce our dependence on foreign markets for electricity and other forms of energy. Additionally, evidence of dwindling international oil …
Putting The Wind At Our Backs: Assessing U.S. Potential For 20% Wind Energy By 2030, Kevin T. Harnett
Putting The Wind At Our Backs: Assessing U.S. Potential For 20% Wind Energy By 2030, Kevin T. Harnett
Honors Theses
The discussion surrounding the future of energy, particularly in the United States, has gained significant momentum in recent years for an obvious reason — it’s daunting. Our dependence on fossil fuels has positioned our nation in an undesirable predicament with a questionable future. With the associated consequences, principally Climate Change, it is essential that energy be addressed as a primary national concern. Renewables need to flip the switch.
Investigating Potential Improvements To Enhance The Performance Of A Solar Thermal Collection System: Design Of The Dual Axis Tracking System, Eric Landry
Honors Theses
Due to the current energy crisis, there are a large number of opportunities in the applications of renewable energy technologies. Specifically, my partner and I have explored those associated with a solar thermal collection dish. The sun, being a virtually limitless supply of energy, ought to be used to its fullest potential. This technology is designed to do just that. Using a concave reflective surface, the sun’s thermal energy is concentrated to a central location where it is then collected by a working fluid. This type of approach achieves very high temperatures and maximizes the effectiveness of the thermal energy …
Small-Scale Solar Central Receiver System Design And Analysis, Daniel Murray
Small-Scale Solar Central Receiver System Design And Analysis, Daniel Murray
Master's Theses
This thesis develops an analytical model of a small-scale solar central receiver power plant located at the California Polytechnic State University in San Luis Obispo, California at 35.28° N, 120.66° W. The model is used to analyze typical energy output at any time during the year. The power plant is designed to produce an output of 100 kW electrical power, and is supplemented by the combustion of natural gas. Methodologies for determining the proper size and layout of heliostats, optimal tower height, receiver size, and turbine engine selection are developed. In this specific design, solar shares of up to 73.2% …
Bubble-Free Oxygen And Carbon Dioxide Mass Transfer In Bioreactors Using Microporous Membranes, Ravi Balgobin
Bubble-Free Oxygen And Carbon Dioxide Mass Transfer In Bioreactors Using Microporous Membranes, Ravi Balgobin
Electronic Thesis and Dissertation Repository
Increasing gas-liquid mass transfer in bioreactors is a major goal for performance improvement in bioprocesses. The effects of bubble-free oxygen and carbon dioxide mass transfer using microporous membranes were tested in a flat module and a hollow fiber module for applications in a bio-fuel cell and cultivation of microalgae. The volumetric mass transfer coefficient, KLa, was compared to conventional bubbling. Liquid agitation rates influenced the mass transfer, as the limiting factor was the liquid boundary layer thickness. The KLa increased as the membrane hydrophobicity increased. The effect of pore size was found to be negligible …
Anaerobic Co-Digestion For Enhanced Renewable Energy And Green House Gas Emission Reduction, Navaneethan Navaratnam
Anaerobic Co-Digestion For Enhanced Renewable Energy And Green House Gas Emission Reduction, Navaneethan Navaratnam
Dissertations (1934 -)
The need to develop renewable energy is important for replacing fossil fuel, which is limited in quantity and also tends to increase in price over time. The addition of high strength organic wastes in municipal anaerobic digesters is growing and tends to increase renewable energy production. In addition, conversion of wastes to energy significantly reduces uncontrolled greenhouse gas emissions. Co-digestion of municipal sludge with any combination of wastes can result in synergistic, antagonistic or neutral outcomes. The objectives of this study were to identify potential co-digestates, determine synergistic, antagonistic and neutral effects, determine economic benefits, quantify performance of bench scale …
Vortex Shedding Dynamics In Long Aspect-Ratio Aerodynamics Bodies, Liu Chen
Vortex Shedding Dynamics In Long Aspect-Ratio Aerodynamics Bodies, Liu Chen
Dissertations, Master's Theses and Master's Reports - Open
The focus of the current dissertation is to study qualitatively the underlying physics of vortex-shedding and wake dynamics in long aspect-ratio aerodynamics in incompressible viscous flow through the use of the KLE method. We carried out a long series of numerical experiments in the cases of flow around the cylinder at low Reynolds numbers. The study of flow at low Reynolds numbers provides an insight in the fluid physics and also plays a critical role when applying to stalled turbine rotors. Many of the conclusions about the qualitative nature of the physical mechanisms characterizing vortex formation, shedding and further interaction …
Plug-In Hybrid Electric Vehicle In Smart Grid, Yin Yao
Plug-In Hybrid Electric Vehicle In Smart Grid, Yin Yao
Electronic Theses and Dissertations
In this thesis, in order to investigate the impact of charging load from plug-in hybrid electric vehicles (PHEVs), a stochastic model is developed in Matlab. In this model, two main types of PHEVs are defined: public transportation vehicles and private vehicles. Different charging time schedule, charging speed and battery capacity are considered for each type of vehicles. The simulation results reveal that there will be two load peaks (at noon and in evening) when the penetration level of PHEVs increases continuously to 30% in 2030. Therefore, optimization tool is utilized to shift load peaks. This optimization process is based on …
Optimization Of Ocean Thermal Energy Conversion Power Plants, Steven Emanoel Rizea
Optimization Of Ocean Thermal Energy Conversion Power Plants, Steven Emanoel Rizea
Electronic Theses and Dissertations
A proprietary Ocean Thermal Energy Conversion (OTEC) modeling tool, the Makai OTEC Thermodynamic and Economic Model (MOTEM), is leveraged to evaluate the accuracy of finite-time thermodynamic OTEC optimization methods. MOTEM is a full OTEC system simulator capable of evaluating the effects of variation in heat exchanger operating temperatures and seawater flow rates. The evaluation is based on a comparison of the net power output of an OTEC plant with a fixed configuration. Select optimization methods from the literature are shown to produce between 93% and 99% of the maximum possible amount of power, depending on the selection of heat exchanger …