A comparative study for selecting more efficient black selective coating in solar water heating system

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 aluminium and traditional matte black paint. Two prototypes of solar water heating system were designed, one having aluminium solar panel coated by matte black paint and the other including solar panel of anodized aluminium electrolytically coloured 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.

Facile Synthesis of Tin (II) Sulphate using Precipitation Method: Effect on Sulfuric Acid Concentration, Heating Temperature and Time, and Effect of Oxygen

“…The left side of the flask neck accommodates a thermocouple (3) that continuously monitors the real-time temperature, ensuring that the synthesis proceeds at the desired temperature without fluctuations. The right side of the neck is connected to a tube from a peristaltic pump (4), which precisely controls the oxygen flow rate from the oxygen gas cylinder (5). This precise oxygen replenishment is crucial for the synthesis reaction to proceed efficiently.…”

“…Among the many derivatives of tin, tin (II) sulfate (SnSO4) stands out as a versatile material with a broad spectrum of applications. Its applications include transparent semiconductor oxide (TSO) for electronic devices [2], electrolyte additive for lead-acid batteries [3], anode material for lithium batteries [4], electrolyte for tin plating [1], anodized aluminum panels for solar water heating systems [5], precursor for SnO2 synthesis [6] and catalyst for biodiesel production [7][8][9], among others. Given its widespread use, numerous methodologies have been thoroughly investigated to synthesize SnSO4efficiently, focusing on minimizing energy consumption, synthesis duration and overall costeffectiveness to attain high-purity SnSO4.…”