Selective Surfaces of Black Chromium for Use in Solar Absorbers

A Survey of Selective Solar Absorbers and Their Limitations

A number of mater ia ls and techniques have been used t o form se lec t ive s o l a r absorber coatings. Each of the coating processes and the coatings formed has i t s own l imi ta t ions which a r e generally paorly defined. The poor s t a t e of knowledge on the l i m i t a t i o n s of the coating processes and the resu l t ing coatings poses a problem f o r the component design and the mat...

A Review of Cermet-based Spectrally Selective Solar Absorbers

Spectrally-selective solar absorbers harvest solar energy in the form of heat. Solar absorbers using cermet-based coatings demonstrate a high absorptance of the solar spectrum and a low emittance in the infrared (IR) regime. Extensive work has been done to optimize cermet-based solar absorbers to achieve high performance by exploring different cermet (ceramic-metal composite) materials and film...

On the Use of Integrating Sphere Reflectometers for Measuring the Solar Absorptance of Selective Surfaces

Solar absorptances are often derived from the reflectance values measured with devices which make use of integrating spheres. Instruments of this type can be operated in two different ways, according to whether spectral or integrated reflectances are measured. Though solar absorptances derived from spectral data are inherently more accurate, some commercially available reflectometers are found ...

Selective Solar Absorber Materials: Nanostructured Surfaces

Current solar to thermal energy conversion technologies, including concentrated solar power (CSP) and solar water heaters (SWH) utilize absorber surfaces that collect incident solar radiation. However, these absorber surfaces emit thermal energy (at their temperature) in the infrared (IR) spectrum, resulting in decreased overall efficiency for solar-to-thermal conversion. Selective absorber sur...

Solution-Chemically Derived Spectrally Selective Solar Absorbers With System Perspectives on Solar Heating