Radiative Transport In Transparent Aerogels For Solar Thermal Energy Applications
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| Author | : Lin Zhao (Ph. D.) |
| Publisher | : |
| Total Pages | : 119 |
| Release | : 2019 |
| Genre | : |
| ISBN | : |
Solar-thermal energy conversion systems hold great promise to meet our diverse energy demand by a renewable source. Converting sunlight into thermal energy requires solar radiation to be absorbed and transformed into heat effectively while minimizing system thermal loss to the ambient environment. Traditional solar-thermal systems utilize high optical concentration and vacuum enclosure to reduce the impact of heat loss. However, the cost of sophisticated optical and thermal components limits their market adoption to date. In this thesis, we explored the development of transparent aerogels for enhancing solar-thermal energy conversion. We established and validated a modeling framework to understand the fundamental light transport within an aerogel sample and yield helpful guidance for material development. We performed synthesis recipe optimization through a systematic parametric study and discovered a facile procedure to fabricate low-scattering aerogel samples with >95% solar transmittance. We then incorporated the developed aerogel in solar-thermal collectors and tested the performance. Under unconcentrated sunlight, stagnation temperature beyond 265 °C can be reached and saturated steam above 120 °C can be generated without vacuum enclosures or selective surfaces. The improvements enabled by the low-scattering aerogels promote a new pathway of solar energy utilization for domestic, industrial, and power generation applications..
| Author | : Meldin Mathew |
| Publisher | : John Wiley & Sons |
| Total Pages | : 548 |
| Release | : 2024-07-02 |
| Genre | : Technology & Engineering |
| ISBN | : 1119717655 |
Explore the energy storage applications of a wide variety of aerogels made from different materials In Aerogels for Energy Saving and Storage, an expert team of researchers delivers a one-stop resource covering the state-of-the-art in aerogels for energy applications. The book covers their morphology, properties, and processability and serves as a valuable resource for researchers and professionals working in materials science and environmentally friendly energy and power technology. The authors offer a comprehensive review of highly efficient energy applications of aerogels that bridges the gap between engineering, science, and chemistry and advances the field of materials development. They provide a Life Cycle Assessment of aerogels in energy systems, as well as discussions of their impact on the environment. Aerogel synthesis, characterization, fabrication, morphology, properties, energy-related applications, and simulations are all explored, and likely future research directions are provided. Readers will also find: A thorough introduction to aerogels in energy, including state-of-the-art advancements and challenges newly encountered Comprehensive explorations of chitin-based and cellulose-derived aerogels, as well as lignin-, clay-, and carbon nanotube-based aerogels Practical discussions of organic, natural, and inorganic aerogels, with further analyses of the lifecycle of aerogels In-depth examinations of the theory, modeling, and simulation of aerogels Perfect for chemical and environmental engineers, Aerogels for Energy Saving and Storage will also earn a place in the libraries of chemistry and materials science researchers in academia and industry.
| Author | : Krunal M. Gangawane |
| Publisher | : Walter de Gruyter GmbH & Co KG |
| Total Pages | : 302 |
| Release | : 2024-06-04 |
| Genre | : Science |
| ISBN | : 3111252000 |
Aerogels are ultralight porous materials showing great promise in environmental remediation and energy storage. Aerogels successfully remove pollutants and can improve the properties of batteries, supercapacitors and even flexible electronics. The book covers the fundamentals of hybrid aerogels synthesis and their applications. It includes computational approaches such as Molecular Dynamics, lattice Boltzmann method and Navier-Stokes solver.
| Author | : Jan Kośny |
| Publisher | : Springer Nature |
| Total Pages | : 487 |
| Release | : 2022-06-06 |
| Genre | : Architecture |
| ISBN | : 3030986934 |
This book offers a unique treatment of building insulating products and the integration of these products with building components. This book was written for all those involved in building design, specification, construction, and commissioning, providing them with an understanding of and appreciation for the wide variety of thermal insulation products and technologies available for use in all types of buildings. The book proceeds from basic definitions and discussion of heat-transfer topics and thermal insulation concepts, to the design and use of these products. The impact of thermal insulation on dynamic building performance, including factors other than heating and cooling, is also discussed. The book does not require an advanced mathematical background. The authors provide sufficient information to provide a qualitative understanding, with more mathematical sections included for those interested in modeling and analysis. The basic physics associated with heat transfer in buildings are presented, along with the steady-state and transient analysis techniques needed for the effective implementation of thermal insulation and assemblies. Modern building design involves the integration of comfort, safety, economics, durability and cost considerations, all of which impact the selection and use of thermal insulation materials in buildings. In addition to theoretical explanations of the underlying science, the book details the properties and application of new thermal insulation materials, including vacuum panels, gas-filled panels, aerogels, phase-change materials, and radiation control technologies. Given its scope, the book will be of interest to researchers and building engineers wishing to understand the latest technologies and materials available, so as to achieve reduced energy consumption in commercial and residential buildings.
| Author | : |
| Publisher | : |
| Total Pages | : 664 |
| Release | : 1985 |
| Genre | : Power resources |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 676 |
| Release | : 1985 |
| Genre | : Power resources |
| ISBN | : |
| Author | : Jochen Fricke |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 210 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 3642933130 |
This book contains the papers presented at the "First International Sympo st sium on Aerogels (1 ISA)", held in September 1985 at. the University of Wiirzburg, Fed. Rep. of Germany. It was the first meet.ing of this kind, wit.h participants from several European count.ries, the United States of America, Canada, South America, and Africa. The meeting was interdisciplinary, with most of the participants being physicists, chemists or material scientists ei ther from universities or from industrial research institutes. Let me try to shed some light upon the class of substances the symposium was about: Aerogels are extremely porous high-tech materials, consisting ei ther of silica, alumina, zirconia, stannic or tungsten oxide or mixtures of these oxides. Due to their high porosity (up t.o 99%!) and t.heir large inner surface, aerogels serve as especially active catalysts or as catalytic subst.rates, as adsorbents, fillers, reinforcement agents, pigments and gellifying agents. Silica aerogels as translucent or transparent superinsulating fillers in window systems could help to considerably reduce thermal losses in windows and to improve the energy balance in passive solar systems. Aerogels also have fas cinating acoustic properties - the sound velocity can be as low as 100 m/s! The production of aerogels starts with the controlled conversion of a sol into a gel: The growth of clusters or polymer chains from a chemical solution, the cross-linking of these primary entities and the formation of a coherent network - still embedded in a liquid.
| Author | : Elise Strobach |
| Publisher | : |
| Total Pages | : 60 |
| Release | : 2017 |
| Genre | : |
| ISBN | : |
Optically transparent, thermally insulating monolithic silica aerogel, with its high solar transmittance and low thermal conductivity, is well-suited for solar thermal applications, particularly concentrated solar power systems. The properties of silica aerogel are directly determined by the structure of the highly porous, interconnected silica network. By using high temperature annealing to control this structure post-synthesis, we were able to optimize the material to increase solar transmittance using an easy and scalable method. The changes caused by annealing were investigated with respect to both temperature and time to relate the structural change to the optical and thermal performance change. The temperature dependent study samples were annealed for 1 hour at various temperatures ranging from 400-1000 °C. The time-dependent studies used samples made from two silica aerogel chemistries and were annealed at two temperatures (400 °C and 600 °C). In general, lower temperatures and times have less overall change (slower change rates) than higher temperature or longer time annealing. Both annealing studies indicate optical performance has an optimum with respect to annealing time, and additional temperature or time negatively affects optical properties due to appreciable structural change. After the temperature annealing studies were used to understand general trends, the time dependent studies were used to maximize the properties of aerogel for CSP applications. The samples showed an increase in solar spectral transmittance of over 3% while the effective thermal conductivity was shown to increase by as much as 40%, indicating a need to optimize the annealing time for maximum performance. The properties of the characterized aerogels were used to demonstrate aerogel annealing optimization in a concentrated solar power receiver model operating at 400 °C. The model predicted a 1% receiver efficiency increase for an operating temperature of 400 °C by annealing for 24 hours, representing a significant gain in overall system efficiency.
| Author | : |
| Publisher | : |
| Total Pages | : 856 |
| Release | : 1985 |
| Genre | : Solar energy |
| ISBN | : |
| Author | : Aftab Aslam Parwaz Khan |
| Publisher | : Elsevier |
| Total Pages | : 398 |
| Release | : 2021-05-29 |
| Genre | : Science |
| ISBN | : 0128208988 |
Advances in Aerogel Composites for Environmental Remediation presents both contextual information aboutaerogels and details about their application in environmental remediation. A wide variety of aerogels are discussed, rangingfrom common to advanced and from natural to synthetic. By exploring ongoing research and developments in the environmentalremediation technologies using aerogel and its composites, this book addresses common day-to-day environmental problemsand presents solutions to the use of aerogel materials. The chapters discuss fabrication of various aerogel composites, alongwith their design and applications toward different environmental remediation technologies. Additionally, the properties andadvantages of aerogels are compared and contrasted to those of traditional materials. Given the consistent increase in environmental pollution, there is an urgent need to explore new materials for advances in remediationtechnology. Advances in Aerogel Composites for Environmental Remediation brings researchers and practitionersin the fields of environmental remediation, environmental science, and engineering to the forefront of remediation technologieswith a thorough breakdown of the benefits of and techniques relevant to aerogel composites. Covers basic properties, unique properties, and fabrication techniques of aerogels, from basic silica aerogels topresent-day conventional aerogels Discusses most of the major environmental remediation techniques and the advantages of using aerogels for theseremediation techniques in comparison to using traditional methods Presents future prospects for utilizing aerogels in modern day-to-day life and in the fabrication of tangible new products
