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Colloidally deposited high-temperature solar selective surfaces
Applied Optics
|April 8, 2010
Summary
Researchers developed stable selective surfaces for solar energy applications using carbon and silica deposition. These surfaces exhibit excellent solar absorptance and low emittance, maintaining performance even after prolonged high-temperature exposure.
Area of Science:
- Materials Science
- Surface Engineering
- Solar Energy Technology
Background:
- Developing selective surfaces is crucial for efficient solar thermal energy conversion.
- High temperature stability is a key challenge for materials used in solar collectors.
Purpose of the Study:
- To create highly stable selective surfaces with excellent solar absorptance and low emittance.
- To evaluate the high-temperature performance and durability of these novel surfaces.
Main Methods:
- Colloidal deposition of carbon and silica onto copper-coated substrates.
- Characterization of solar absorptance and thermal emittance.
- High-temperature vacuum heat treatment (600°C for 200 hours).
Main Results:
- Achieved a selective surface with a solar absorptance of 0.87.
- Measured a room temperature emittance of 0.03.
- The surface properties remained unchanged after 200 hours of heat treatment at 600°C in vacuum.
Conclusions:
- Colloidal deposition of carbon and silica yields highly stable selective surfaces.
- The developed surfaces demonstrate excellent performance and durability for high-temperature solar applications.
