Preparation and characterization of SiO2 two-step aerogels

Beck, Andreas; Popp, G.; Emmerling, A.; Fricke, J.

doi:10.1007/bf00486376

Cited by 7 publications

(9 citation statements)

References 3 publications

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“…The IR absorptance of silica aerogels is purely a function of the optical thickness of the aerogel, which is the product of the thickness of the material and its density, so absorptance results for a given density can be linearly scaled to find the properties at a different density. Figure 2 shows the measured extinction (absorption plus scattering) of various silica aerogels, normalized by their densities [32,41,42,43,40].…”

Section: Detailed Modelmentioning

confidence: 99%

“…This trend is illustrated in Figure 2. It has been shown that for a given density, the pore structure of the aerogel and hence its scattering is a strong function of the manufacturing process [32,44]. Figure 2 is the bulk extinction of three aerogels produced with different processes but all having nearly the same density (80 kg/m 3 ) [32].…”

Section: Detailed Modelmentioning

confidence: 99%

“…For the bands longer than 2 µm, the wavelength-dependent properties (from [41]) are averaged with equal weighting. For the bands shorter than 2 µm where the solar spectrum dominates the radiative transfer, the wavelength-dependent properties (from [32], pH=13)…”

Section: Shown Inmentioning

confidence: 99%

“…are averaged using the solar spectrum as the weighting. [32]. Markers without lines show measured specific absorption coefficients of silica aerogels [41,42,43].…”

Section: Shown Inmentioning

confidence: 99%

“…The properties of aerogels can be modified through seed inclusions such as oxide particles [30] or carbon-based flakes or rods [31]. They also are strongly dependent on the synthesis technique [32]. By choosing the right materials and process, aerogels can be achieved with desired performance characteristics for solar thermal receivers.…”

Section: Introductionmentioning

confidence: 99%

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Aerogel-based solar thermal receivers

et al. 2017

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In any solar thermal application, such as solar space heating, solar hot water for domestic or industrial use, concentrating solar power, or solar air conditioning, a solar receiver converts incident sunlight into heat. In order to be efficient, the receiver must ideally absorb the entire solar spectrum while losing relatively little heat. Currently, state-of-the-art receivers utilize a vacuum gap above an absorbing surface to minimize the convection losses, and selective surfaces to reduce radiative losses. Here we investigate a receiver design that utilizes aerogels to suppress radiation losses, boosting the efficiency of solar thermal conversion. We predict that receivers using aerogels could be more efficient than vacuum-gap receivers over a wide range of operating temperatures and optical concentrations. Aerogel-based receivers also make possible new geometries that cannot be achieved with vacuum-gap receivers.

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Section: Detailed Modelmentioning

confidence: 99%

Section: Detailed Modelmentioning

confidence: 99%

Section: Shown Inmentioning

confidence: 99%

“…are averaged using the solar spectrum as the weighting. [32]. Markers without lines show measured specific absorption coefficients of silica aerogels [41,42,43].…”

Section: Shown Inmentioning

confidence: 99%