Study of surfaces, produced with the use of granite and titanium, for applications with solar thermal collectors

Araújo, Felipe Alves Albuquerque; Freire, Francisco Nivaldo Aguiar; Pinho, Diego Caitano; Dutra, Kaio Hemerson; Rocha, Paulo Alexandre Costa; Silva, Maria Eugênia Vieira da

doi:10.1515/rams-2021-0005

Cited by 3 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, in [4], the average absorptance of graphene and black paint coated samples was found to be about 0.87 and 0.82, respectively. Researchers have also synthesized stable selective surfaces using titanium oxide and waste from the granite industry [5]. In [6], multilayer spectral selective iron oxides were considered, and in [7], selective coatings based on transition metals and their compounds were reviewed.…”

Section: U Smentioning

confidence: 99%

Upper bound efficiency for thermal radiation energy conversion by using spectrally selective electrical, chemical and mechanical work extractors

Badescu

2023

Phys. Scr.

View full text Add to dashboard Cite

The maximum work content factor of the incoming thermal radiation energy depends on the temperatures of the radiation source, work extractor and environment, on the solid angle subtended by the radiation source, and on the averaged absorptance and emittance of the work extractor. The theory is applied to solar radiation as a particular case. The formula derived here for is more accurate than well-known formulas from literature. The work extractor may provide work or not, depending on the averaged absorptance and emittance and radiation concentration. Solar thermal power plants based on plane blackbody collectors cannot provide work under unconcentrated solar radiation.

show abstract

Section: U Smentioning

confidence: 99%

Upper bound efficiency for thermal radiation energy conversion by using spectrally selective electrical, chemical and mechanical work extractors

Badescu

2023

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…To analyze and compare the performance of the selective surfaces, an energy balance was performed in a bench test. Figure 4 shows the representation of the energy balance in the system 11,12 .…”

Section: Energy Balance In the Test Benchmentioning

confidence: 99%

Characterization of a Selective Surface Based on Chromium, Iron and Aluminum Oxides for Application in Solar-Thermal Collectors

et al. 2022

Self Cite

View full text Add to dashboard Cite

The depletion of conventional energy sources and the concern with the environmental impacts of the use of fossil fuels sparked interest in researching new energy sources and improving existing processes. In this context, the solar energy presents itself as one of the most promising energy sources on the planet, given its wide availability and applicability in thermal processes. However, its use still represents a great technological and economic challenge, because many systems that use this energy still have low efficiency and high cost, which makes them uncompetitive in competition with systems using other energies. With that, the search for the improvement of the processes awakens the researches in more adequate and cheaper materials, which represents a great scientific potential in the evolution of these technologies. Thus, the present work proposes to obtain and analyze a selective surface for applications in solar-thermal collectors, using CRFO (compound formed by chromium and iron oxides), varying the percentage by weight, and then mixed with aluminum oxide. For the tests, an experimental bench was built to simulate a flat plate solar-thermal collector in real operating conditions. Some characterizations were carried out, such as: techniques scanning electron microscopy (SEM), infrared analysis and UV-VIS absorptivity determination, as well as the graphs with surface temperatures and with radiation during the tests in the Sun for the composite (CRFO and aluminum oxide) and for the commercial surface (MRTiNOX). With the results obtained, it was verified in the field test that one of the produced selective surfaces obtained a result of absorptivity of 0.94 and 0.0349 of emissivity, which is close to that of the commercial surface. The results were confirmed in the characterization by UV-VIS, which showed high absorptivity values in the visible light range.

show abstract

Review on nanocomposites based on aerospace applications

Bhat

Budholiya

Raj

et al. 2021

Nanotechnology Reviews

125

View full text Add to dashboard Cite

Advanced materials were used and are being implemented in structural, mechanical, and high-end applications. Contemporary materials are used and being implemented in structural, mechanical, and high-end applications. Composites have several major capabilities, some of them being able to resist fatigue, corrosion-resistance, and production of lightweight components with almost no compromise to the reliability, etc. Nanocomposites are a branch of materials within composites, known for their greater mechanical properties than regular composite materials. The use of nanocomposites in the aerospace industry currently faces a research gap, mainly identifying the future scope for application. Most successes in the aerospace industry are because of the use of suitable nanocomposites. This review article highlights the various nanocomposite materials and their properties, manufacturing methods, and their application, with key emphasis on exploiting their advanced and immense mechanical properties in the aerospace industry. Aerospace structures have used around 120,000 materials; herein, nanocomposites such as MgB2, multi-walled carbon nanotubes, and acrylonitrile butadiene styrene/montmorillonite nanocomposites are discussed, and these highlight properties such as mechanical strength, durability, flame retardancy, chemical resistance, and thermal stability in the aerospace application for lightweight spacecraft structures, coatings against the harsh climate of the space environment, and development of microelectronic subsystems.

show abstract

Study of surfaces, produced with the use of granite and titanium, for applications with solar thermal collectors

Cited by 3 publications

References 10 publications

Upper bound efficiency for thermal radiation energy conversion by using spectrally selective electrical, chemical and mechanical work extractors

Upper bound efficiency for thermal radiation energy conversion by using spectrally selective electrical, chemical and mechanical work extractors

Characterization of a Selective Surface Based on Chromium, Iron and Aluminum Oxides for Application in Solar-Thermal Collectors

Review on nanocomposites based on aerospace applications

Contact Info

Product

Resources

About