Experiment and One-dimensional Mathematical Model for the Heat Transfer in a Solar Convective Furnace
01 Jan 2019-
About: The article was published on 2019-01-01. It has received None citations till now. The article focuses on the topics: Heat transfer & Convection.
TL;DR: Laminar flow heat transfer in annulus, simultaneous development of velocity and temperature fields and constant wall heat flux were discussed in this article, where the authors used Laminar Flow Heat Transfer (LFT) to transfer heat from annulus.
Abstract: Laminar flow heat transfer in annulus, simultaneous development of velocity and temperature fields and constant wall heat flux
TL;DR: A review of the different CSP aided thermochemical processes for hydrogen and syngas production is presented in this paper, where the current challenges of the technology and the process for its future commercialization are also analyzed.
Abstract: Hydrogen is a promising energy carrier for transportation, domestic and industrial applications. Nowadays hydrogen is consumed basically by the chemical industry, but in long term its demand is expected to grow significantly due to emerging markets. Hence production of hydrogen with sustainable methods is a relevant issue. This work presents a review of the different CSP- aided thermochemical processes for hydrogen and syngas production. For each process, some relevant solar-tested reactor prototypes are described. In a second part, the developed solar furnaces for investigation of thermochemical process are also discussed. In addition, relevant research on hydrogen or syngas production in solar tower installations is presented. Finally the current challenges of the technology and the process for its future commercialization are also analyzed.
TL;DR: In this article, a review on all fields connected with materials where concentrated solar energy has been applied is presented, including metallurgy, materials processing (welding and cladding; surface treatments; coatings and surface hardening; and, powder metallometry), and non-metallic materials (ceramics, fullerenes, carbon nanotubes, and production of lime).
Abstract: New energy sources have been researched with the objective of achieving a reduction in the emissions of greenhouse gases as well as other polluting gases. Solar energy is one of the options as when properly concentrated offers a great potential in high temperature applications. This paper offers a review on all fields connected with materials where concentrated solar energy has been applied. These applications include metallurgy, materials processing (welding and cladding; surface treatments; coatings and surface hardening; and, powder metallurgy), and non-metallic materials (ceramics, fullerenes, carbon nanotubes, and production of lime).
TL;DR: In this paper, the Open Volumetric Air Receiver (OVAR) is used for heat treatment of steels and other possible extractive metallurgy operations such as the smelting of metals from its ores.
Abstract: Electrical energy is employed for processing operations of material, such as, smelting, soaking and heat treatment. During this process, fossil, coal, and nuclear as a fuel is employed. Extraction and use of these fuel sources have serious environmental implications. Moreover, the employed process involves conversion of fuel to heat and then to electricity. Double conversion process can be avoided by directly introducing hot air provided by a solar tower equipped with a volumetric air receiver into a retrofitted furnace. This is a clean, green alternative for generating high temperatures required for metals processing operations. Initially a system would be developed for the heat treatment of aluminum, which requires temperature between 290 and 400 °C. A survey of the literature shows that quantitative design basis of individual volumetric air receiver components is conspicuous by its absence. Hence the objective of this investigation has been to use principles of fluid flow and heat transfer to design individual components of an Open Volumetric Air Receiver (OVAR) system. Experiments on a 2 kW th Solar Air Tower Simulator system (SATS) validate the process used in designing individual components of the OVAR. The ultimate aim of this research is to develop a system that can be used for heat treatment of steels and other possible extractive metallurgy operations such as the smelting of metals from its ores.
TL;DR: In this article, an open volumetric air receiver for metal processing was designed and evaluated using the ANSYS-FLUENT computational fluid dynamics tool for uniform and non-uniform heating of porous absorbers.
Abstract: India receives abundant radiant energy from the sun on account of being located at the equatorial solar belt. Especially, an annual global solar radiation of about ⩾2400 kW h/m2 is received in Rajasthan and in northern Gujarat. As a part of research initiative at IIT Jodhpur, heliostat based concentrated solar tower using an open volumetric air receiver is being developed for generation of high-temperature process heat, which can be utilized for metal processing operations. This technology includes sub-systems such as thermal energy storage and heat exchangers. In particular, the presented paper describes the design evaluation of an open volumetric air receiver. Experiments and computational fluid dynamics tool, ANSYS-FLUENT are used for this purpose. The obtained hot air (heat transfer fluid) can be employed, for instance, in heat treatment of metal such as Aluminum. The considered design aspects of the open volumetric air receiver are as follows: a. Influence of material thermal conductivity on the heat transfer modelling and thermally induced flow instability; b. Thermal–hydraulic analysis of recirculating air injection system; c. Influence of absorber porosity on the heat transfer using the performed experiments; d. Design and evaluation of the designed mixer-assembly for uniform and non-uniform heating of porous absorber. In this paper, the first section presents order-of-magnitude analysis to quantify the effect of thermal conductivity of the solid on heat transfer process with porous absorbers. The second section deals with analysis of thermally induced flow instability in porous absorbers with the validated and numerically adopted computational fluid dynamics tool, namely, FLUENT using the reported experiment by Fend et al. (2004a). In addition, the effect of thermal conductivity on thermally induced flow instability is presented. The next section presents three-dimensional analysis of the designed mixer-assembly for receiver using the validated CFD tool FLUENT. For this purpose, analyses are performed with different designs of mixer-plate and for different receiver geometries. Further, based on the detailed analysis, the injection mechanisms of recirculating air for circular and square absorber based receivers are proposed. Finally, a 4kWth experimental facility, which is being commissioned at IIT Jodhpur to test solar thermal sub-systems such as receiver, heat exchanger, thermal energy storage and experimental evaluation of receiver components are described. These experiments demonstrate the effect of absorber-porosity, uniform and non-uniform concentrated solar irradiance level on heat transfer with porous absorbers and effectiveness of the selected mixer-assembly design in such a condition.
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