Author by: Giulio Lorenzini Language: en Publisher by: Morgan & Claypool Publishers Format Available: PDF, ePub, Mobi Total Read: 39 Total Download: 367 File Size: 49,8 Mb Description: The book contains research results obtained by applying Bejan's Constructal Theory to the study and therefore the optimization of fins, focusing on T-shaped and Y-shaped ones. Heat transfer from finned surfaces is an example of combined heat transfer natural or forced convection on the external parts of the fin, and conducting along the fin.

Fin's heat exchange is rather complex, because of variation of both temperature along the fin and convective heat transfer coefficient. Furthermore possible presence of more fins invested by the same fluid flow has to be considered.

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Classical fin theory tried to reduce the coupled heat transfer problem to a one-dimensional problem by defining an average temperature of the fin and writing equations using this parameter. However, it was shown that this approach cannot be used because of the effects of two-dimensional heat transfer, especially in the presence of short fins. CFD codes offer the possibility to consider bi-dimensional (and more generally, three-dimensional) effects and then a more real approach to the physic phenomena of finned surface's heat exchange. A commercial CFD code was used to analyse the case of heat exchange in presence of T-shaped fins, following an approach suggested by Bejan's Constructal Theory. The comparative results showed a significant agreement with previous research taken as a reference, and this result allows for the application of this approach to a wider range of systems.

T-shaped optimized fin geometry is the starting point for further research. Starting from the optimal results (T-shape optimized fins), we show the trend of the assessment parameter (the dimensionless conductance) in function of the angle between the two horizontal arms of the fin. A value for, 90.

Author by: C.A. Free Coby Tv Repair Manual. Brebbia Language: en Publisher by: WIT Press Format Available: PDF, ePub, Mobi Total Read: 60 Total Download: 421 File Size: 41,7 Mb Description: Discussing the future of energy production and management in a changing world, this book presents the proceedings of the 2nd International Conference on Energy Production and Management in the 21st Century: The Quest for Sustainable Energy. The intention of the book is to examine the future of energy production and management in a changing world and follows on from the first and very successful meeting held in Ekaterinburg, Russia in 2014.

Developed societies require an ever increasing amount of energy resources, which creates complex technological challenges. Search Toolbar For Google Chrome here. The challenge in many cases is the conversion of new sources of energy into useful forms such as electricity, heat and fuel while finding efficient ways of storing and distributing energy. Equal challenges lie with the production of such renewable energy at an acceptable cost, including damage to the environment, as well as with integration of those resources into the existing infrastructure. The book deliberates the energy use of industrial processes, including the imbedded energy contents of materials, such as those in the built environment. Energy production, distribution and usage, result in environmental risks which need to be better understood. They are part of the energy economics and relate to human environmental health as well as ecosystems behaviour. A number of topics are covered including: Energy and the city; Energy security; Energy distribution; Energy networks; Processing of oil and gas emissions; Pipelines; Renewable energies; Energy use in building; Industry and transport; Safety management; Tight energy fields; Energy and climate change and Biomass and biofuels.