scholarly journals European Round Robin Test on Solar Collectors and Solar Thermal Systems

2011 ◽  
Author(s):  
Stephan Fischer ◽  
Maria João Carvalho ◽  
Christian Weißmüller
Keyword(s):  
Round Robin ◽  
Solar Thermal ◽  
Solar Collectors ◽  
Thermal Systems ◽  
Round Robin Test

scholarly journals Aplicaciones del Captador Solar de Placa Plana y del Captador de Tubo de Vacío en la Edificación = Applications of the Flat Plate Solar Collectors and the Vacuum Tube Solar Collectors in Building

2018 ◽  
Vol 4 (3) ◽  
pp. 25 ◽  
Author(s):  
Daniel Ferrández ◽  
Carlos Moron ◽  
Jorge Pablo Díaz ◽  
Pablo Saiz
Keyword(s):  
Flat Plate ◽  
Solar Collector ◽  
Energy Demand ◽  
Hot Water ◽  
Solar Thermal ◽  
Solar Collectors ◽  
Thermal Systems ◽  
Vacuum Tube ◽  
Solar Thermal Collectors ◽  
Flat Plate Solar Collector

ResumenEl actual Código Técnico de la Edificación (CTE) pone de manifiesto la necesidad de cubrir parte de la demanda energética requerida para el abastecimiento de agua caliente sanitaria y climatización de piscinas cubiertas mediante sistemas de aprovechamiento de la energía solar térmica. En este artículo se presenta una comparativa entre las dos principales tipologías de captadores solares térmicos que existen en el mercado: el captador de placa plana y el captador de tubo de vacío, atendiendo a criterios de fracción solar, diseño e integración arquitectónica. Todo ello a fin de discernir en qué circunstancias es más favorable el uso de uno u otro sistema, comparando los resultados obtenidos mediante programas de simulación con la toma de medidas in situ.AbstractThe current Technical Building Code (CTE) highlights the need to cover part of the energy demand required for the supply of hot water and heating of indoor swimming pools using solar thermal systems. This article presents a comparison between the two main types of solar thermal collectors that exist in the market: the flat plate solar collector and the vacuum tube solar collector, according to criteria of solar fraction, design and architectural integration. All of this in order to discern in what circumstances the use of one or the other system is more favourable, comparing the results obtained through simulation programs with the taking of measurements in situ.

scholarly journals Heat Transfer of Nanomaterial over an Infinite Disk with Marangoni Convection: A Modified Fourier’s Heat Flux Model for Solar Thermal System Applications

2021 ◽  
Vol 11 (24) ◽  
pp. 11609
Author(s):  
Mahanthesh Basavarajappa ◽  
Giulio Lorenzini ◽  
Srikantha Narasimhamurthy ◽  
Ashwag Albakri ◽  
Taseer Muhammad
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Thermal Energy ◽  
Fossil Fuels ◽  
Marangoni Convection ◽  
Solar Thermal ◽  
Solar Collectors ◽  
Thermal Systems ◽  
Flux Model ◽  
Heat Flux Model

The demand for energy due to the population boom, together with the harmful consequences of fossil fuels, makes it essential to explore renewable thermal energy. Solar Thermal Systems (STS’s) are important alternatives to conventional fossil fuels, owing to their ability to convert solar thermal energy into heat and electricity. However, improving the efficiency of solar thermal systems is the biggest challenge for researchers. Nanomaterial is an effective technique for improving the efficiency of STS’s by using nanomaterials as working fluids. Therefore, the present theoretical study aims to explore the thermal energy characteristics of the flow of nanomaterials generated by the surface gradient (Marangoni convection) on a disk surface subjected to two different thermal energy modulations. Instead of the conventional Fourier heat flux law to examine heat transfer characteristics, the Cattaneo–Christov heat flux (Fourier’s heat flux model) law is accounted for. The inhomogeneous nanomaterial model is used in mathematical modeling. The exponential form of thermal energy modulations is incorporated. The finite-difference technique along with Richardson extrapolation is used to treat the governing problem. The effects of the key parameters on flow distributions were analyzed in detail. Numerical calculations were performed to obtain correlations giving the reduced Nusselt number and the reduced Sherwood number in terms of relevant key parameters. The heat transfer rate of solar collectors increases due to the Marangoni convection. The thermophoresis phenomenon and chaotic movement of nanoparticles in a working fluid of solar collectors enhance the temperature distribution of the system. Furthermore, the thermal field is enhanced due to the thermal energy modulations. The results find applications in solar thermal exchanger manufacturing processes.

scholarly journals Solar Thermal Systems Performances versus Flat Plate Solar Collectors Connected in Series

Engineering ◽  
2012 ◽  
Vol 04 (12) ◽  
pp. 881-893 ◽  
Author(s):  
Khaled Zelzouli ◽  
Amenallah Guizani ◽  
Ramzi Sebai ◽  
Chakib Kerkeni
Keyword(s):  
Flat Plate ◽  
Solar Thermal ◽  
Solar Collectors ◽  
Thermal Systems ◽  
In Series

scholarly journals Results and analysis of a round robin test program for liquid-heating flat-plate solar collectors

Solar Energy ◽  
1979 ◽  
Vol 22 (3) ◽  
pp. 235-249 ◽  
Author(s):  
Elmer R. Streed ◽  
James E. Hill ◽  
William C. Thomas ◽  
Aaron G. Dawson ◽  
Byard D. Wood
Keyword(s):  
Flat Plate ◽  
Round Robin ◽  
Solar Collectors ◽  
Test Program ◽  
Round Robin Test

Density Determination of Sintered Steel – Results of a Round Robin Test

2019 ◽  
Vol 56 (11) ◽  
pp. 731-746
Author(s):  
R. Peters ◽  
P. Beiss ◽  
S. Lindlohr
Keyword(s):  
Round Robin ◽  
Sintered Steel ◽  
Round Robin Test ◽  
Density Determination

Reconstruction of multiple cracks in an ECT round-robin test

2004 ◽  
Vol 19 (1-4) ◽  
pp. 399-404 ◽  
Author(s):  
Mihai Rebican ◽  
Noritaka Yusa ◽  
Zhenmao Chen ◽  
Kenzo Miya ◽  
Tetsuya Uchimoto ◽  
...  
Keyword(s):  
Round Robin ◽  
Multiple Cracks ◽  
Round Robin Test
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