Single-Glazed Vacuum Tube Collector with SnAl<sub>2</sub>O<sub>3</sub> Selective Flat Absorber Plate and Gravity Single-Stage Direct Water Flow: A Comprehensive Geometric Optimization
This paper continues the mathematical research of the novel glass tube collectors for water heating. The subject of this research is a vacuum solar collector composed of a glass tube and a selective (using the SnAl<sub>2</sub>O<sub>3</sub> coating) flat absorber plate. Water...
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MDPI AG
2025-02-01
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| author | Aleksandar Nešović Robert Kowalik |
| author_facet | Aleksandar Nešović Robert Kowalik |
| author_sort | Aleksandar Nešović |
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| description | This paper continues the mathematical research of the novel glass tube collectors for water heating. The subject of this research is a vacuum solar collector composed of a glass tube and a selective (using the SnAl<sub>2</sub>O<sub>3</sub> coating) flat absorber plate. Water heating is performed using gravitational driving force and single-stage direct flow. The thermal performance with the geometric optimization (absorber width and glass tube thickness) of the presented solar collector type was determined using the specially designed iterative calculation algorithm (phase 1) and the double multi-criteria analysis (phase 2). Different operational (absorber temperature, ambient temperature and wind speed), geometric (mass, surface occupation, total surface occupation and volume occupation), economic (manufacturing costs and exploitation costs) and ecological (embodied energy and greenhouse gas emission) indicators were taken into account. The results showed that the useful heat power has an increasing trend if the flat absorber plate width increases, while the thermal efficiency has a decreasing trend. It was also determined that the glass tube thickness and the thermal performance of the solar collector are oppositely dependent. The main conclusion of this paper is that the optimal performance of such non-conventional solar systems is achieved when the absorber plate width is between 85 and 90 mm. |
| format | Article |
| id | doaj-art-2fe7a4fbcd934fb4aa9a41ad82648fa9 |
| institution | DOAJ |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-02-01 |
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| spelling | doaj-art-2fe7a4fbcd934fb4aa9a41ad82648fa92025-08-20T03:12:04ZengMDPI AGApplied Sciences2076-34172025-02-01154183810.3390/app15041838Single-Glazed Vacuum Tube Collector with SnAl<sub>2</sub>O<sub>3</sub> Selective Flat Absorber Plate and Gravity Single-Stage Direct Water Flow: A Comprehensive Geometric OptimizationAleksandar Nešović0Robert Kowalik1Institute for Information Technologies, University of Kragujevac, Jovana Cvijića bb, 34000 Kragujevac, SerbiaFaculty of Environmental Engineering, Geodesy and Renewable Energy, Kielce University of Technology, Tysiaclecia P.P. 7, 25-314 Kielce, PolandThis paper continues the mathematical research of the novel glass tube collectors for water heating. The subject of this research is a vacuum solar collector composed of a glass tube and a selective (using the SnAl<sub>2</sub>O<sub>3</sub> coating) flat absorber plate. Water heating is performed using gravitational driving force and single-stage direct flow. The thermal performance with the geometric optimization (absorber width and glass tube thickness) of the presented solar collector type was determined using the specially designed iterative calculation algorithm (phase 1) and the double multi-criteria analysis (phase 2). Different operational (absorber temperature, ambient temperature and wind speed), geometric (mass, surface occupation, total surface occupation and volume occupation), economic (manufacturing costs and exploitation costs) and ecological (embodied energy and greenhouse gas emission) indicators were taken into account. The results showed that the useful heat power has an increasing trend if the flat absorber plate width increases, while the thermal efficiency has a decreasing trend. It was also determined that the glass tube thickness and the thermal performance of the solar collector are oppositely dependent. The main conclusion of this paper is that the optimal performance of such non-conventional solar systems is achieved when the absorber plate width is between 85 and 90 mm.https://www.mdpi.com/2076-3417/15/4/1838absorberdirect water flowglass tubemathematical modelmulti-criteria analysisoptimization |
| spellingShingle | Aleksandar Nešović Robert Kowalik Single-Glazed Vacuum Tube Collector with SnAl<sub>2</sub>O<sub>3</sub> Selective Flat Absorber Plate and Gravity Single-Stage Direct Water Flow: A Comprehensive Geometric Optimization Applied Sciences absorber direct water flow glass tube mathematical model multi-criteria analysis optimization |
| title | Single-Glazed Vacuum Tube Collector with SnAl<sub>2</sub>O<sub>3</sub> Selective Flat Absorber Plate and Gravity Single-Stage Direct Water Flow: A Comprehensive Geometric Optimization |
| title_full | Single-Glazed Vacuum Tube Collector with SnAl<sub>2</sub>O<sub>3</sub> Selective Flat Absorber Plate and Gravity Single-Stage Direct Water Flow: A Comprehensive Geometric Optimization |
| title_fullStr | Single-Glazed Vacuum Tube Collector with SnAl<sub>2</sub>O<sub>3</sub> Selective Flat Absorber Plate and Gravity Single-Stage Direct Water Flow: A Comprehensive Geometric Optimization |
| title_full_unstemmed | Single-Glazed Vacuum Tube Collector with SnAl<sub>2</sub>O<sub>3</sub> Selective Flat Absorber Plate and Gravity Single-Stage Direct Water Flow: A Comprehensive Geometric Optimization |
| title_short | Single-Glazed Vacuum Tube Collector with SnAl<sub>2</sub>O<sub>3</sub> Selective Flat Absorber Plate and Gravity Single-Stage Direct Water Flow: A Comprehensive Geometric Optimization |
| title_sort | single glazed vacuum tube collector with snal sub 2 sub o sub 3 sub selective flat absorber plate and gravity single stage direct water flow a comprehensive geometric optimization |
| topic | absorber direct water flow glass tube mathematical model multi-criteria analysis optimization |
| url | https://www.mdpi.com/2076-3417/15/4/1838 |
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