Digital Commons Network^™

The Effects Of Scale On Granular Mixing In A Double Screw Pyrolyzer, Breanna L. Marmur

Breanna L. Marmur

Granular mixing processes are important to many industries including the pharmaceutical, agricultural, and biotechnology industries. These processes often require both a high degree of homogeneity and a high degree of customizability. As granular mixing processes are so widely employed, a thorough understanding of the mixing dynamics is necessary to understand and control the resulting products. Research into granular mixing processes has been, thus far, largely focused on laboratory scale mixers with simple geometries, while actual industrial processes often require large mixers with complex geometries. Moreover, granular mixing processes are often very sensitive to changes in operating conditions and any solutions …

Open Source Low-Cost Power Monitoring System, Shane W. Oberloier, Joshua M. Pearce

Joshua M. Pearce

This study presents an entirely open-source, low-cost power monitoring system capable of many types of measurements including both loads and supplies such as solar photovoltaic systems. In addition, the system can be fabricated using only open source software and hardware. The design revolves around the Digital Universal Energy Logger (DUEL) Node, which is responsible for reading and properly scaling the voltage and current of a particular load, and then serializing it via an on-board ATTiny85 chip. The configuration of the DUEL node allows for custom sensitivity ranges, and can handle up to 50 A and 300 V. Up to 127 …

Market Segmentation Vs. Subsidization: Clean Energy Credits And The Commerce Clause's Economic Wisdom, Felix Mormann

Felix Mormann

The dormant Commerce Clause has long been a thorn in the side of state policymakers. The latest battleground for the clash between federal courts and state legislatures is energy policy. In the absence of a decisive federal policy response to climate change, nearly thirty states have created a new type of securities—clean energy credits—to promote lowcarbon renewable and nuclear power. As more and more of these programs come under attack for alleged violations of the dormant Commerce Clause, this Article explores the constitutional constraints on clean energy credit policies. Careful analysis of recent and ongoing litigation reveals the need for …

Can Clean Energy Policy Promote Environmental, Economic, And Social Sustainability?, Felix Mormann

Felix Mormann

Two and a half decades of clean energy policymaking focused primarily on environmental and economic sustainability have yielded considerable environmental and economic benefits. Along the way, however, other policy considerations, such as the social sustainability of the transition to a cleaner, renewably fueled energy economy, have gone largely overlooked. As clean energy technologies continue to gain ever-greater traction in the United States and global energy economies, the social impacts of their enabling policies become more and more salient. Already, ratepayers, taxpayers, and other stakeholders who fear being left behind by the clean energy transition question the “fairness” of today’s renewable …

Virtual Inertia: Current Trends And Future Directions, Ujjwol Tamraker, Dipesh Shrestha, Manisha Maharjan, Bishnu P. Bhattarai, Timothy M. Hansen, Reinaldo Tonkoski

Reinaldo Tonkoski

The modern power system is progressing from a synchronous machine-based system towards an inverter-dominated system, with large-scale penetration of renewable energy sources (RESs) like wind and photovoltaics. RES units today represent a major share of the generation, and the traditional approach of integrating them as grid following units can lead to frequency instability. Many researchers have pointed towards using inverters with virtual inertia control algorithms so that they appear as synchronous generators to the grid, maintaining and enhancing system stability. This paper presents a literature review of the current state-of-the-art of virtual inertia implementation techniques, and explores potential research directions …

A Tale Of Three Markets: Comparing The Renewable Energy Experiences Of California, Texas, And Germany, Felix Mormann, Dan Reicher, Victor Hanna

Felix Mormann

The Obama administration has repeatedly identified the large-scale build-out of clean, renewable energy infrastructure as a key priority of the United States. The President’s calls for a cleaner energy economy are often accompanied by references to other industrialized countries such as Germany, hailed by many as a leader in renewable energy deployment. Indeed, the share of renewables in Germany’s electricity generation mix is twice that of the United States, and the ambitious “Energiewende” commits the country to meeting 80% of its electricity needs with renewables by 2050. While some praise the German renewables experience as successful proof of concept, others …

Book Review: Global Energy Justice, Carmen G. Gonzalez

Carmen G. Gonzalez

Renewable, Ethical? Assessing The Energy Justice Potential Of Renewable Electricity, Aparajita Banerjee, Emily Prehoda, Roman Sidortsov, Chelsea Schelly

Chelsea Schelly

Energy justice is increasingly being used as a framework to conceptualize the impacts of energy decision making in more holistic ways and to consider the social implications in terms of existing ethical values. Similarly, renewable energy technologies are increasingly being promoted for their environmental and social benefits. However, little work has been done to systematically examine the extent to which, in what ways and in what contexts, renewable energy technologies can contribute to achieving energy justice. This paper assesses the potential of renewable electricity technologies to address energy justice in various global contexts via a systematic review of existing studies …

A Realistic Meteorological Assessment Of Perennial Biofuel Crop Deployment: A Southern Great Plains Perspective, Melissa Wagner, Meng Wang, Gonzalo Miguez-Macho, Jesse Miller, Andy Vanloocke, Justin E. Bagley, Carl J. Bernacchi, Matei Georgescu

Andy VanLoocke

Utility of perennial bioenergy crops (e.g., switchgrass and miscanthus) offers unique opportunities to transition toward a more sustainable energy pathway due to their reduced carbon footprint, averted competition with food crops, and ability to grow on abandoned and degraded farmlands. Studies that have examined biogeophysical impacts of these crops noted a positive feedback between near-surface cooling and enhanced evapotranspiration (ET), but also potential unintended consequences of soil moisture and groundwater depletion. To better understand hydrometeorological effects of perennial bioenergy crop expansion, this study conducted high-resolution (2-km grid spacing) simulations with a state-of-the-art atmospheric model (Weather Research and Forecasting system) dynamically …

High Tech High Touch: Lessons Learned From Project Haiti 2011, Yan Tang, Marc Compere, Yung Lun Wong, Jared Anthony Coleman, Matthew Charles Selkirk

Marc Compere

In this paper, we will share our experiences and lessons learned from a design project for providing clean water to a Haitian orphanage (Project Haiti 2011). Supported by funds from a renewable energy company and the university president’s office, five engineering students and two faculty members from Embry-Riddle Aeronautical University successfully designed and installed a solar powered water purification system for an orphanage located in Chambellan, Haiti. This paper discusses the unique educational experiences gained from unusual design constraints, such as ambiguity of existing facilities due to limited communication, logistics of international construction at a remote village location, and cross-cultural …

Demand Response And Market Power, Bruce R. Huber

Bruce R Huber

In her article, Bypassing Federalism and the Administrative Law of Negawatts, Sharon Jacobs educates her readers about the concept of demand response, and then describes its propagation in recent years while making the broader argument that the Federal Energy Regulatory Commission (“FERC”) — the federal government’s principal energy regulator — has engaged in a strategy of “bypassing federalism” that may entail more costs than benefits. Professor Jacobs is right to call attention to demand response and to FERC’s approach to matters of jurisdictional doubt. While I share many of her concerns about boundary lines in a federal system, I argue …

An Entrochemical Water Heater, Sanza Kazadi, Sabrina Lin, Kelvin Ye

Sanza Kazadi

Compact Single Multistage Distillation, Sanza Kazadi, Brent Usui, Ashley An, Robin B. Zhao

Sanza Kazadi

Sym Executive Summary, João Gomes

João F Gomes

Methanation Note.Pdf, João Gomes

João F Gomes

Solar Rights In The United States, Sara Bronin

Sara C. Bronin

Solar rights are legal rights needed to ensure that a piece of land has access to sunlight. These rights may be of interest to property owners seeking to undertake a variety of activities: farming, lighting, and clothes drying, to name a few. But perhaps the most economically significant purpose for which solar rights may be utilized is for the purpose of solar collectors. Such devices are used to harness the rays of the sun and transform them into thermal, chemical, or electrical energy. In an era of increasing deployment of solar collectors across the globe, the fair and efficient allocation …

Community Voices: Perspectives On Renewable Energy In Nunavut, Nicole C. Mcdonald, Joshua M. Pearce

Joshua M. Pearce

Nunavut communities currently depend on imported diesel fuel for virtually all of their energy needs. This dependency not only hinders the ability of communities to be self-sufficient, but also has negative impacts on their environment, health, and social well-being. The current practices waste 65% of the energy created and place a serious economic strain on the society by consuming 20% of the government’s annual budget. Although renewable energy technologies (RETs) could partially offset diesel use, there is a lack of sufficient information to mold appropriate policy. This investigation of community perspectives contributes to information needed to develop sustainable energy policies …

Toward Renewable Eenergy Geo-Information Infrastructures: Applications Of Giscience And Remote Sensing That Build Institutional Capacity, K. Calvert, Joshua M. Pearce, W. E. Mabee

Joshua M. Pearce

Sustained policy support is necessary in order to drive a transition toward renewable energy (RE). The ability to realize RE policy objectives is constrained by a range of geographic factors related to resource potential, the distribution of resources, land availability/suitability, the absorptive capacity of proximal infrastructure, and local socio-political acceptance. With this in mind, this paper provides a systematic review of how geographic information science and remote sensing techniques have been applied to reduce uncertainties surrounding renewable energy development, with emphasis on policy and planning needs. The concept of a ‘geo-information infrastructure’ is used to bring coherence and direction to …

Incorporating Shading Losses In Solar Photovoltaic Potential Assessment At The Municipal Scale, Ha T. Nguyen, Joshua M. Pearce

Joshua M. Pearce

Recently several algorithms have been developed to calculate the solar photovoltaic (PV) potential on the basis of 2.5D raster data that can capture urban morphology. This study provides a new algorithm that (i) incorporates both terrain and near surface shadowing effects on the beam component; (ii) scales down the diffuse components of global irradiation; and (iii) utilizes free and open source GRASS and the module r.sun in modeling irradiation. This algorithm is semi-automatic and easy to upgrade or correct (no hand drawn areas), open source, detailed and provides rules of thumb for PV system design at the municipal level. The …

Low Cost Solar Chimney Performance-Improving Enhancement, Sanza Kazadi, Meishan Liang, Aaron Togelang, Daniel Chan

Sanza Kazadi

Spectrally-Selective All-Inorganic Scattering Luminophores For Solar Energy-Harvesting Clear Glass Windows, Ramzy Alghamedi, Mikhail Vasiliev, Mohammad Alam, Kamal Alameh

Mikhail Vasiliev

All-inorganic visibly-transparent energy-harvesting clear laminated glass windows are the most practical solution to boosting building-integrated photovoltaics (BIPV) energy outputs significantly while reducing cooling- and heating-related energy consumption in buildings. By incorporating luminophore materials into lamination interlayers and using spectrally-selective thin-film coatings in conjunction with CuInSe2 solar cells, most of the visible solar radiation can be transmitted through the glass window with minimum attenuation while ultraviolet (UV) radiation is down-converted and routed together with a significant part of infrared radiation to the edges for collection by solar cells. Experimental results demonstrate a 10 cm × 10 cm vertically-placed energy-harvesting clear glass …

Energy In The Ecopolis, Sara Bronin

Sara C. Bronin

Climate change, resource scarcity, and environmental degradation demand a paradigm shift in urban development. Currently, too many of our cities exacerbate these problems: they pollute, consume, and process resources in ways that negatively impact our natural world. Cities of the future must make nature their model, instituting circular metabolic processes that mimic, embrace, and enhance nature. In other words, a city must be a regenerative city or, as some say, an “ecopolis.” So, how to get there—to ecopolis—from here? In this Comment, I propose a partial answer by focusing on certain legal frameworks that must be reenvisioned to enable the …

Renewing Electricity Competition, David Schraub

David Schraub

“Gatting” The New Climate Treaty Right: Leveraging Energy Subsidies To Promote Multilateralism, Deepa Badrinarayana

Deepa Badrinarayana

Renewable Energy Through Agency Action, Amy L. Stein

Amy L. Stein

Despite the many societal benefits associated with renewable energy, it is used to generate only about 5 percent of our nation's electricity needs. The bulk of governmental efforts to rectify this situation have disproportionately impacted private actors. This Article argues that the federal government should expand its efforts to more fully capture the gains that can be achieved by targeting both private and public actors, particularly federal agencies. Federal agencies have enormous purchasing power that can be channeled toward using electricity and fuels derived from renewable energy. Federal agencies are some of the largest consumers of electricity. Federal agencies manage …

Optimal Design Of A Pv/Fuel Cell Hybrid Power System For The City Of Brest In France, Dr. Adel A. Elbaset

Dr. Adel A. Elbaset

This paper deals with the optimal design of a stand-alone hybrid photovoltaic and fuel cell power system without battery storage to supply the electric load demand of the city of Brest, Western Brittany in France. The proposed optimal design study is focused on economical performance and is mainly based on the loss of the power supply probability concept. The hybrid power system optimal design is based a simulation model developed using HOMER. In this context, a practical load demand profile of Brest city is used with real weather data.

See The Mojave!, John C. Nagle

John Copeland Nagle

This article examines how the law is being asked to adjudicate disputed sights in the context of the Mojave Desert. The Mojave is the best known and most explored desert in the United States. For many people, though, the Mojave is missing from any list of America’s scenic wonders. The evolution in thinking about the Mojave’s aesthetics takes places in two acts. In the first act, covering the period from the nineteenth century to 1994, what began as a curious voice praising the desert’s scenery developed into a powerful movement that prompted Congress to enact the CDPA. The second act …

Green Harms Of Green Projects, John C. Nagle

John Copeland Nagle

This article describes the recent development of renewable energy to examine environmental law’s three contrasting approaches to the green harms of green projects. Sometimes the law allows the green benefit regardless of the green harm. Sometimes the law prohibits the green harm regardless of the green benefit. And sometimes the law allows a balancing of all of the harms and benefits, green or not. Given these options, I argue that the law should not ignore or understate green harms even if they are caused by green projects. There are some types of green harms that no benefit can justify. But …

Linking Land Use With Climate Change And Sustainability Topped State Legislative Land Use Reform Agenda In 2008, Patricia E. Salkin

Patricia E. Salkin

Linking land use with climate change and sustainability topped state legislative land use reform agenda in 2008. The only discernible state land use reform trends in 2008 have focused primarily on themes surrounding sustainability. Many states pursued statutory reforms to address the strong linkages between land use and climate change, green development and affordable housing. Only one state, Michigan, focused on recodification of its planning and zoning enabling acts.

Peaceful Coexistence: Independent Microgrids Are Coming, Sara C. Bronin, Paul Mccary

Sara C. Bronin

The growing push for microgrids in the United States over the last five years has generated a lot of excitement. Those worried about our aging transmission and distribution infrastructure hope microgrids can reduce demands on that grid, while increasing reliability. Environmentalists and energy efficiency advocates think microgrids can help us both decrease reliance on fossil fuels and improve the way we utilize waste heat. Academics love the concept, because microgrids—an out-of-the-box approach with far-reaching implications on user-utility relationships—provide great fodder for research and commentary. Perhaps most significantly in this struggling economy, a growing number of companies have invested millions in …