scholarly journals Structure and Properties of Highly Porous Alumina-Based Ceramic Materials after Heating by Concentrated Solar Radiation

Ceramics ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 24-33
Author(s):  
Vladimir G. Babashov ◽  
Sultan Kh. Suleimanov ◽  
Mikhail I. Daskovskii ◽  
Evgeny A. Shein ◽  
Yurii V. Stolyankov
Keyword(s):  
Compressive Strength ◽  
Phase Composition ◽  
Solar Radiation ◽  
Ceramic Materials ◽  
Solar Furnace ◽  
Prolonged Treatment ◽  
Fibrous Materials ◽  
Concentrated Solar Radiation ◽  
Fusion Mode ◽  
Heating Up

Three ceramic fibrous materials of the Al2O3-SiO2 system with different densities have been treated using concentrated solar radiation. The experiment was performed using technological capabilities of the Big Solar Furnace in the 2 modes: the first mode includes heating up to 1400–1600 °C, holding for 1.5–2 h; the second mode (the fusion mode) includes heating up to 1750–1900 °C until the sample destruction, which is accompanied by fusion. Upon completion of the experiment, the phase composition, microstructure, and compressive strength of the materials were studied. It was shown that the investigated materials retained their fibrous structure under prolonged treatment in the first mode up to temperatures of 1600 °C. The phase composition of the ceramic materials changes during the experiment, and with a decrease in the density, the modification is more pronounced. Treatment of all three materials under study in the fusion mode resulted in the formation of the eutectic component in the form of spherulites. The compressive strength of the materials was found to be slightly reduced after exposure to concentrated solar radiation.

Interaction of Concentrated Solar Radiation with Materials

2020 ◽  
pp. 1-3
Author(s):  
Muhammad-Sultanhan Paizullahanov ◽  
◽  
Rasul Akbarov ◽  
Abdurashid Abdurakhim Uglu ◽  
Kholmatov, Muslimbek Mukhsinjon ugli Sobirov ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Solar Radiation ◽  
Recovery Process ◽  
Solar Furnace ◽  
Structure And Properties ◽  
Technological Parameters ◽  
Fine Grained ◽  
Concentrated Solar Radiation ◽  
The Relationship ◽  
Synthesis Of Materials

The paper analyzes approaches to modeling the processes of interaction of concentrated solar radiation with materials. The experimental results obtained on the synthesis of materials from a melt in a solar furnace are presented. It is shown that when melting in a solar furnace under the influence of concentrated solar radiation of high density due to the acceleration of the recovery process, it is possible to obtain a fine-grained microstructure that gives the material enhanced mechanical and dielectric properties. It is shown that the relationship between the structure and properties of the materials obtained with the technological parameters of melting and cooling in a solar furnace can be used as an approach to modeling the interaction of concentrated solar radiation with materials

The SCATMES Device for Measurement of Concentrated Solar Radiation

1999 ◽  
Vol 121 (2) ◽  
pp. 116-120 ◽  
Author(s):  
A. Neumann ◽  
A. Schmitz
Keyword(s):  
Solar Radiation ◽  
Measurement System ◽  
Flux Distribution ◽  
Optical Design ◽  
Video Camera ◽  
Solar Furnace ◽  
Camera Systems ◽  
Measurement Principle ◽  
Concentrated Solar Radiation ◽  
Compact Geometry

Video camera systems monitoring a diffuse reflecting target for measuring the flux distribution of concentrated solar radiation are quite common. This technique cannot be used if parts of the experimental setup screen the surface of the target. The development of a new measurement system with a compact geometry and a new optical design is described. With this system it is possible to measure the flux distribution behind parts of an experiment and at any position of the plane of measurement, without any alteration of the setup. The sources of error, especially those of the target and the camera, are described and discussed, and finally a comparison to the existing FATMES-System, which has been performed at the solar furnace of the DLR in Cologne, is presented. Due to its measurement principle the new system is called ’Scanning Camera and Target Measurement System‘ (acronym: SCATMES).

scholarly journals Wear-Resistant Materials Synthesized in A Solar Furnace

2020 ◽  
pp. 1-3
Author(s):  
Paizullakhanov MS ◽  
◽  
Kholmatov AA ◽  
Sobirov MM ◽  
Khamdamov B ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Solar Radiation ◽  
Absorption Coefficient ◽  
Optimal Combination ◽  
Solar Furnace ◽  
Amorphous Phases ◽  
Fine Crystalline Structure ◽  
Concentrated Solar Radiation ◽  
Synthesis Of Materials

The influence of technological modes of the Big Solar Furnace on the process of synthesis of materials from the melt is studied. It is shown that for the synthesis of materials with a set of specified properties, it is necessary to optimize the density and nature of the energy distribution of concentrated solar radiation in accordance with the degree of blackness, absorption coefficient, melting temperature and thermal conductivity of the charge. It is shown that the remelted state and a homogeneous fine-crystalline structure with an optimal combination of crystalline and amorphous phases, which leads to increased wear resistance of the material.

PSA Solar furnace: A facility for testing PV cells under concentrated solar radiation

2006 ◽  
Vol 90 (15) ◽  
pp. 2480-2488 ◽  
Author(s):  
J. Fernández-Reche ◽  
I. Cañadas ◽  
M. Sánchez ◽  
J. Ballestrín ◽  
L. Yebra ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Solar Furnace ◽  
Concentrated Solar Radiation

scholarly journals Approaches to Simulation of Interaction of Concentrated Solar Radiation with Materials

2021 ◽  
pp. 354-358
Author(s):  
Muhammad S. Paizullakhanov ◽  
Rasul Yu. Akbarov
Keyword(s):  
Dielectric Properties ◽  
Solar Radiation ◽  
Recovery Process ◽  
Solar Furnace ◽  
Structure And Properties ◽  
Technological Parameters ◽  
Fine Grained ◽  
Concentrated Solar Radiation ◽  
The Relationship ◽  
Synthesis Of Materials

The paper analyzes approaches to modeling the processes of interaction of concentrated solar radiation with materials. The experimental results obtained on the synthesis of materials from a melt in a solar furnace are presented. It is shown that when melting in a solar furnace under the influence of concentrated solar radiation of high density due to the acceleration of the recovery process, it is possible to obtain a fine-grained microstructure that gives the material enhanced mechanical and dielectric properties. It is shown that the relationship between the structure and properties of the materials obtained with the technological parameters of melting and cooling in a solar furnace can be used as an approach to modeling the interaction of concentrated solar radiation with materials

Astrophysical and Mineralogical Experiments in the DLR Solar Furnace

Solar Energy ◽  
2003 ◽  
Author(s):  
M. Sauerborn ◽  
A. Neumann ◽  
W. Seboldt
Keyword(s):  
Solar Radiation ◽  
Vacuum Chamber ◽  
Lunar Regolith ◽  
High Vacuum ◽  
Thermal Reduction ◽  
Solar Furnace ◽  
Small Samples ◽  
Controlled Cooling ◽  
Fast Heating ◽  
Concentrated Solar Radiation

The DLR Solar Furnace in Cologne is a facility that concentrates direct solar radiation with a concentration factor up to 5200. The energy of such concentrated solar radiation can be used to cause thermal or photochemical effects in the irradiated materials. For astrophysical and mineralogical applications a new vacuum chamber with a specific design and instrumentation for solar experiments was developed and installed at the DLR Solar Furnace. This facility enables testing of small samples under high vacuum conditions. Within a project dealing with chondrule formation (chondrules are parts of meteorites) solid samples were melted by concentrated solar radiation. The aim was to investigate and simulate a fast heating-up (“flash heating”) of the samples and a subsequent solidification by controlled cooling. Another experiment series investigates thermal reduction of samples of metal oxide and of lunar regolith simulant. The goal of this activity is to produce oxygen and eventually also pure metals by pyrolysis. The in-situ production of oxygen and metals on the moon is a key technology for future lunar bases or manned Mars missions. The first solar furnace tests within both projects showed the performance of the new vacuum chamber and the feasibility of the different investigation paths.

scholarly journals The Interaction Model of Concentrated Solar Radiation with Materials

2020 ◽  
Vol 1 (4) ◽  
pp. 1-6
Author(s):  
Payzullakhanov M.S
Keyword(s):  
Solar Radiation ◽  
Feasibility Study ◽  
Interaction Model ◽  
Experimental Results ◽  
Solar Furnace ◽  
Concentrated Solar Radiation ◽  
Synthesis Of Materials

The paper analyzes approaches to modeling the processes of interaction of concentrated solar radiation with materials. The experimental results obtained on the synthesis of materials from a melt in a solar furnace are presented. The features of the interaction of concentrated solar radiation with materials are analyzed. The mechanisms are described and a model for the interaction of concentrated solar radiation with materials is created. A feasibility study is proposed for the technology of glass-based glass materials obtained on the Big Solar Furnace.

scholarly journals Wear-Resistant Materials Synthesized in A Solar Furnace

2020 ◽  
pp. 1-10.47363/JMSMR/2020(1)110
Author(s):  
Paizullakhanov MS ◽  
◽  
Kholmatov AA ◽  
Sobirov MM ◽  
Khamdamov B ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Solar Radiation ◽  
Absorption Coefficient ◽  
Optimal Combination ◽  
Solar Furnace ◽  
Amorphous Phases ◽  
Fine Crystalline Structure ◽  
Concentrated Solar Radiation ◽  
Synthesis Of Materials

The influence of technological modes of the Big Solar Furnace on the process of synthesis of materials from the melt is studied. It is shown that for the synthesis of materials with a set of specified properties, it is necessary to optimize the density and nature of the energy distribution of concentrated solar radiation in accordance with the degree of blackness, absorption coefficient, melting temperature and thermal conductivity of the charge. It is shown that the remelted state and a homogeneous fine-crystalline structure with an optimal combination of crystalline and amorphous phases, which leads to increased wear resistance of the material

scholarly journals Gas Flow in Hot Porous Materials: The Solar Air Receiver and Spin-Off Applications

2006 ◽  
Author(s):  
Thomas Fend ◽  
Bernhard Hoffschmidt ◽  
Oliver Reutter ◽  
Jo¨rg Sauerhering ◽  
Robert Pitz-Paal
Keyword(s):  
Solar Radiation ◽  
Porous Materials ◽  
Gas Flow ◽  
Flow Instability ◽  
Cooling System ◽  
Cross Flow ◽  
Ceramic Materials ◽  
Turbine Cooling ◽  
Concentrated Solar Radiation ◽  
Micrometer Scale

This article presents an overview on research results from various projects, which deal with one common problem: gas flow in hot porous materials. First, the solar air receiver, which converts concentrated solar radiation into heat in an air circuit, is described as far as the basic principle and the materials employed are concerned. Then, results from experiments in concentrated solar radiation are presented. Materials employed in these applications are extruded ceramic materials as well as metal and ceramic foams with pore sizes on the milli- and micrometer scale. As it turned out, the material properties significantly influence the efficiency of the solar air receiver. It is shown, that under specific conditions flow instability occurs, which may lead to a thermal overload of the material. Measures to avoid these overloads are proposed. Two approaches how to predict gas flow theoretically are reported. Additionally, it is shown, how material quantities such as pressure drop characteristics influence the flow behaviour and the temperature distribution inside the material. Finally, before a conclusion is given, two further applications, which have been dealt with because similar phenomena occur, are reported: an advanced cross flow particle filter and a gas turbine cooling system.

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