scholarly journals Numerical Simulations for Analyzing the Efficiency Parameters of a New Type of Flat-Plate Solar Collectors

2020 ◽  
Vol 20 (4) ◽  
pp. 70-85
Keyword(s):  
Flat Plate ◽  
Solar Collector ◽  
Cold Water ◽  
Thermal Characteristics ◽  
Solar Thermal ◽  
Maximum Temperature ◽  
Inlet Temperature ◽  
Ansys Fluent ◽  
Collector Plate ◽  
Flat Plate Solar Collector

This article discusses a new design concept for a flat solar collector using flexible tubes. A flat-plate solar collector is designed to run cold water into solar heating systems instead of using expensive antifreeze fluids and to remove secondary media. The development of this type of solar thermal collectors will reduce the installation costs of traditional solar thermal systems without the need for secondary heat exchangers. We determined the main parameters of the heat capacity of a flat solar collector and computed the temperature profile of the absorber plate of a flat-plate solar collector with an inlet temperature of 30 °C. In contrast to a tube coil type temperature loop, it was found that the maximum temperature of the collector plate under the same inlet temperature conditions is much lower than that of the former. Using the CFD (Computational Fluid Dynamics) ANSYS FLUENT 19.0 commercial software package, a phase design was developed based on predictions of the reservoir thermal characteristics and the equivalent heat transfer coefficient of the absorber plates. Experimental test variables for a flat-plate solar collector were also calculated; these were higher with incident solar radiation than with ambient temperature.

scholarly journals Determining the Effect of Inlet Flow Conditions on the Thermal Efficiency of a Flat Plate Solar Collector

Fluids ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 67 ◽  
Author(s):  
Mohammad Alobaid ◽  
Ben Hughes ◽  
Andrew Heyes ◽  
Dominic O’Connor
Keyword(s):  
Flat Plate ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Maximum Temperature ◽  
Inlet Temperature ◽  
Flow Conditions ◽  
Riser Pipe ◽  
Computational Fluid Dynamics Cfd ◽  
Flat Plate Solar Collector ◽  
Feed Temperature

The main objective of this study was to investigate the effect of inlet temperature (Tin) and flowrate ( m ˙ ) on thermal efficiency ( η t h ) of flat plate collectors (FPC). Computational Fluid Dynamics (CFD) was employed to simulate a FPC and the results were validated with experimental data from literature. The FPC was examined for high and low level flowrates and for inlet temperatures which varied from 298 to 373 K. Thermal efficiency of 93% and 65% was achieved at 298 K and 370 K inlet temperature’s respectively. A maximum temperature increase of 62 K in the inlet temperature was achieved at a flowrate of 5 × 10−4 kg/s inside the riser pipe. Tin and m ˙ were optimised in order to achieve the minimum required feed temperature for a 10 kW absorption chiller.

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 Entropy generation analysis for the design of a flat plate solar collector with fins

DYNA ◽  
2020 ◽  
Vol 87 (212) ◽  
pp. 199-208
Author(s):  
Milton Muñoz ◽  
Manuel Roa ◽  
Rodrigo Correa
Keyword(s):  
Flat Plate ◽  
Entropy Generation ◽  
Solar Collector ◽  
Entropy Generation Rate ◽  
Design Parameters ◽  
Outlet Temperature ◽  
Minimum Entropy ◽  
Airflow Velocity ◽  
Collector Plate ◽  
Flat Plate Solar Collector

This article describes the optimal design of a flat-plate solar collector with fins, based on the minimum entropy generation criterion. The design parameters were optimized, considering entropy generation due to heat transfer and airflow. The latter has not been considered in previous works. The flat plate in the collector is assimilated to a finned heat sink. The dimensionless entropy generation variation is analyzed to increase values of the number of fins, as well as for different plate thicknesses and heights. We also considered variations in airflow velocity. Our data shows that airflow velocity greatly influences entropy generation. Values other than the optimum found, caused a considerable growth of total entropy. For a collector area of 4 m2, and an outlet temperature of 50°C, the optimum parameters that minimize the entropy generation rate were: 9 fins on each side of the collector plate, a height of 5 x10-2 m, a thickness of 25x10-3m, and an air velocity variable between 0.015 and 0.046 m/s. This development is relevant to the design of flat plate solar collectors, for grain drying applications.

scholarly journals Enhancement of Thermal Performance of Absorber Flat Plate Solar Collector

2019 ◽  
Vol 9 (1) ◽  
Keyword(s):  
Fluid Dynamics ◽  
Flat Plate ◽  
Thermal Performance ◽  
Solar Collector ◽  
Transfer Rate ◽  
Thermal Power ◽  
Maximum Temperature ◽  
Computer Assisted ◽  
Basic Design ◽  
Flat Plate Solar Collector

The main objective of this work is to improve the heat transfer rate by changing the design of the absorber flat plate and to compare the different results of computer-assisted fluid dynamics analysis for all designs. In this work, fluid dynamics analyzes were performed for six flat plate vacuum absorbent designs to improve temperature distribution and heat generation to improve thermal performance, variable as axial and radial speed, pressure distribution, function of flow, etc. The interpretation 4 is 15.339% more efficient than the basic design in terms of maximum temperature and thermal power, which was increased by 8.14% compared to the basic design. It is recommended that version 4 of the flat absorbent plate is optimal for better heating

Performance of the Flat Plate Solar Collector Operated with Water-Al2O3 Nanofluid

2016 ◽  
Vol 831 ◽  
pp. 181-187 ◽  
Author(s):  
Janusz T. Cieśliński ◽  
Bartosz Dawidowicz ◽  
Aleksandra Popakul
Keyword(s):  
Flat Plate ◽  
Solar Collector ◽  
Base Fluid ◽  
Fossil Fuels ◽  
Thermal Characteristics ◽  
Working Fluid ◽  
Solar Collectors ◽  
Recent Method ◽  
Flat Plate Solar Collector

Solar collectors is one of the technologies absorbing energy from solar beam and utilizing it for heating purposes, displacing the need to burn fossil fuels. There are many ways to improve effectiveness of the solar collectors [1,2]. Recent method to absorb more heat from the solar beam is to modify thermal characteristics of the working fluid. For this purpose one can use nanofluids, i.e. suspensions of metallic or nonmetallic nanoparticles in a base fluid [3].

scholarly journals Improvement of the Solar-Thermal Characteristics of the Flat-Plate Collector Using a Composite Coating

2021 ◽  
Vol 24 (1) ◽  
pp. 24-29
Author(s):  
Ruaa H. Jasim ◽  
◽  
Ahmed A. Al-Tabbakh ◽  
Sinan M. Hasan ◽  
◽  
...  
Keyword(s):  
Composite Coating ◽  
Thermal Characteristics ◽  
Thermal Conversion ◽  
Primary Component ◽  
Solar Thermal ◽  
Maximum Temperature ◽  
Black Paint ◽  
Reflectance Measurement ◽  
Collector Plate ◽  
Flat Plate Collector

A commercially available matt black paint is used as the primary component of a composite coating for low-temperature flat collector systems. The composite coating is composed of the paint, carbon black powder (CBP) and lithium metal oxide (LMO) powder. The CBP and LMO powders are added on the top of the primary paint to improve the solar-thermal conversion characteristics of the collector. The optical and solar-thermal conversion characteristics of these coatings are investigated by means of optical microscopy, optical spectrophotometry, total reflectance measurement, and the measurement of the maximum collector temperature. Results show that the solar-thermal conversion response (maximum temperature) of the collector plate can be improved with the addition of the CBP and LMO powder at low concentrations. This is been demonstrated and discussed in this report. The coatings prepared in the present work can easily be applied on the collector surface and exhibit competing characteristics to other coatings.

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