A comparative study for selecting more efficient black selective coating in solar water heating system | ||
| Egyptian Journal of Chemistry | ||
| Article 55, Volume 64, Issue 10, October 2021, Pages 5957-5962 PDF (741.24 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejchem.2021.88962.4272 | ||
| Authors | ||
| Maha Shaffei1; Hala Hussein* 2; Nagwa Khatab3; ahmed awad4; Nabila Shabaan5; Marwa Ebrahim Shalaby6 | ||
| 1Chemical Engineering &Pilot Plant Dep., National Research Centre | ||
| 2National Research Centre | ||
| 3Solar Energy Dep., National Research Centre | ||
| 4chemical Engineering&pilot Dep.,National Research Centre | ||
| 5chemical Engineering &Pilot Plant Dep.,, National Research Centre | ||
| 6Professor chemical engineering | ||
| Abstract | ||
| Solar thermal collector represents a common system for efficient solar energy conversion. In the field of solar panels, there are numerous types of coatings, their absorptivity is almost more than 90%. The challenge now is to lower the heat loss through emissivity as it predicts the ultimate efficiency (i.e. performance). The solar selective coating is showing higher solar absorption efficiency compared to the commercial black paint, that are applied in most usual solar water heating systems. The present research is devoted to test two types of coatings: second anodized aluminum and traditional matte black paint. Two prototypes of solar water heating system were designed, one having aluminum solar panel coated by matte black paint and the other including solar panel of anodized aluminum electrolytically colored by tin metal ions after two steps of anodization. The second anodized was found to be superior. The calculated performance or efficiency was about 62%. The efficiency of matte black paint was less than the second anodized type. Moreover, the performance without collector glass cover is lowered drastically | ||
| Keywords | ||
| solar panel coatings; solar collector efficiency; solar heating system performance; selectivity; absorptivity; emissivity | ||
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