Bent Sørensen

Bio: Bent Sørensen is an academic researcher from Roskilde University. The author has contributed to research in topics: Renewable energy & Intermittent energy source. The author has an hindex of 33, co-authored 242 publications receiving 3655 citations. Previous affiliations of Bent Sørensen include University of Liège & Niels Bohr Institute.

Hydrogen and Fuel Cells: Emerging Technologies and Applications

Abstract: A hydrogen economy, in which this one gas provides the source of all energy needs, is often touted as the long-term solution to the environmental and security problems associated with fossil fuels. However, before hydrogen can be used as fuel on a global scale we must establish cost effective means of producing, storing, and distributing the gas, develop cost efficient technologies for converting hydrogen to electricity (e.g. fuel cells), and creating the infrastructure to support all this. Sorensen is the only text available that provides up to date coverage of all these issues at a level appropriate for the technical reader. The book not only describes the 'how' and 'where' aspects of hydrogen fuels cells usage, but also the obstacles and benefits of its use, as well as the social implications (both economically and environmental). Written by a world-renowned researcher in energy systems, this thoroughly illustrated and cross-referenced book is an excellent reference for researchers, professionals and students in the field of renewable energy. It includes updated sections on PEM fuel cells, Molten carbonate cells, Solid Oxide cells and Biofuel cells. It includes updated material to reflect the growing commercial acceptance of stationary and portable fuel cell systems, while also recognizing the ongoing research in automotive fuel cell systems. This title includes a new example of a regional system based on renewable energy sources reflects the growing international attention to uses of renewable energy as part of the energy grid. This title includes examples of life cycle analysis of environmental and social impacts.

Renewable energy : its physics, engineering, use, environmental impacts, economy and planning aspects

Abstract: Renewable Energy, published by Academic Press in 1979, is considered the foundation text for renewable energy studies worldwide. The First Edition put renewable energy on the map, academically speaking. In 1979 there were no academic curricula in this field at any university, so the book was targeted at graduate level and researchers. Today, however, the importance of the topic is widely acknowledged. Not only it is taught in engineering, physics, and environmental sciences departments, but is actively researched and studied in many organizations and energy-related industries. The topic of energy policies, where renewable energies play a vital role, is actively discussed at the scientific and political level. The Second Edition of Renewable Energy is more accessible to researchers and students approaching the field for the first time. Each chapter has a general, introductory section, followed by an "advanced topics" part. This gives university lecturers the possibility of including some advanced topics of their choice while at the same time allowing researchers to use the book as a reference work. Features: * Provides the principles of renewable energy flows/sources and energy conversion processes * Covers the engineering and economic aspects of the field * Outlines the expansion of the field since the publication of the first edition * Remains the most important volume in the field

Renewable Energy: Physics, Engineering, Environmental Impacts, Economics and Planning

Abstract: This volume is a true shelf reference, providing a thorough overview of the entire renewable energy sphere, while still functioning as a go-to information source for professionals and students when they need answers about a specific technical issue. Crafted over the last 15 years into a problem-solving tool for engineers, researchers, consultants and planners currently working in the field, as well as a detailed map of the renewables universe for those looking to expand into new technological specialties, "Renewable Energy by Sorensen" offers the most comprehensive coverage of the subject available. The book has been structured around three parts in order to assist readers in focusing on the issues that impact them the most for a given project or question. PART I covers the basic scientific principles behind all major renewable energy resources, such as solar, wind and biomass. Part II provides in-depth information about how these raw renewable sources can actually be converted into useful forms, transmitted into the grid and stored for future utilization. Finally, part III undertakes the aspects of energy planning, environmental impacts and socio-economic issues on regional and global levels. In this fourth edition update, new material includes expanded coverage of biofuels, solar conversion, biomass and fuel cells, storage and transmission, and a new chapter on integrated technologies to introduce the hybrid systems now being explored. New surveys and the most recent research findings are included throughout. It is new, thoroughly updated fourth edition of the authoritative field guide to the entire Renewable Energy universe. These are the only books to scientific principles and implementation methods, technologies and socio-economics, environmental impacts and cutting-edge advances, all in one volume. New material includes expanded coverage of biofuels, solar conversion, biomass and fuel cells, storage and transmission, and a new chapter on integrated systems.

Two Treatises of Government.

Abstract: All these premises having, as I think, been clearly made out, it is impossible that the rulers now on earth should make any benefit, or derive any the least shadow of authority from that, which is held to be the fountain of all power, Adam's private dominion and paternal jurisdiction; so that he that will not give just occasion to think that all government in the world is the product only of force and violence, and that men live together by no other rules but that of beasts, where the strongest carries it, and so lay a foundation for perpetual disorder and mischief, tumult, sedition and rebellion, (things that the followers of that hypothesis so loudly cry out against) must of necessity find out another rise of government, another original of political power, and another way of designing and knowing the persons that have it, than what Sir Robert Filmer hath taught us.

Hydrogen production from renewable and sustainable energy resources: Promising green energy carrier for clean development

Abstract: Fossil fuel consumption in transportation system and energy-intensive sectors as the principal pillar of civilization is associated with progressive release of greenhouse gases. Hydrogen as a promising energy carrier is a perfect candidate to supply the energy demand of the world and concomitantly reduce toxic emissions. This article gives an overview of the state-of-the-art hydrogen production technologies using renewable and sustainable energy resources. Hydrogen from supercritical water gasification (SCWG) of biomass is the most cost effective thermochemical process. Highly moisturized biomass is utilized directly in SCWG without any high cost drying process. In SCWG, hydrogen is produced at high pressure and small amount of energy is required to pressurize hydrogen in the storage tank. Tar and char formation decreases drastically in biomass SCWG. The low efficiency of solar to hydrogen system as well as expensive photovoltaic cell are the most important barriers for the widespread commercial development of solar-based hydrogen production. Since electricity costs play a crucial role on the final hydrogen price, to generate carbon free hydrogen from solar and wind energy at a competitive price with fossil fuels, the electrical energy cost should be four times less than commercial electricity prices.