Characterization and thermal aging tests of Cr based multilayer for unconcentrated solar thermal applications

Caldarelli, Antonio; D’Alessandro, Carmine; Maio, Davide De; Luca, Daniela De; Gaudino, Eliana; Musto, Marilena; Gennaro, Emiliano Di; Russo, R.

doi:10.1016/j.tsf.2021.138870

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…There is some small change in the absorptivity curve, however the slight decrease in reflectivity in the region around 500-600 nm, where the Sun spectrum has the maximum intensity, compensates the slight increase in reflectivity at wavelength above 1000 nm and the absorptance value is unchanged. Preliminary results on the ageing of coatings designed to work at 300°C indicate that the service lifetime will be larger than 25 years [26].…”

Section: Resultsmentioning

confidence: 99%

Multilayers for efficient thermal energy conversion in high vacuum flat solar thermal panels

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Multilayers for efficient thermal energy conversion in high vacuum flat solar thermal panels

et al. 2021

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“…The experimental setup for the SSA sample's emissivity measurements, considered in this manuscript is depicted in Figure 1 and it is routinely used to assess the SSA properties also during aging tests (Caldarelli et al, 2021). It consists of a rectangular stainless steel vacuum chamber (n° 1 in Figure 1) sealed by a removable glass cover (n°2 in Figure 1).…”

Section: Measurement Proceduresmentioning

confidence: 99%

Thermal Emittance Measurement of Very Low-Emissive Materials for Solar Thermal Applications

Gaudino,

Farooq,

Caldarelli

et al. 2024

Preprint

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In the quest for more efficient solar thermal systems, accurately determining the thermal emittance of low-emissive materials is crucial in determining the power losses. This paper describes the calorimetric method designed to precisely measure the thermal emittance of Selective Solar Absorbers (SSAs) to be used in High Vacuum Flat Plate Collectors (HVFPCs). The method's capability is demonstrated through the successful correction of thermal emittance values for copper samples of varying sizes, including dimensions down to 49 cm². Results highlight the method's potential to significantly reduce measurement errors associated with small-size and/or low-emittance samples, providing a path forward to improve the design and efficiency of SSAs. This research marks a significant step in advancing solar thermal technology by enabling emittance measurements with a precision better than 0.003, which is essential for the development of high-performance solar thermal absorbers. The method has also been applied to correct the thermal emittance value of SSA measured in previous measurement campaigns, and it allows a better estimation of the SSA efficiency conversion curve.

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An overview on energy and exergy analysis of solar thermal collectors with passive performance enhancers

Murugan

Saravanan

Elumalai

et al. 2022

Alexandria Engineering Journal

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Characterization and thermal aging tests of Cr based multilayer for unconcentrated solar thermal applications

Cited by 7 publications

References 19 publications

Multilayers for efficient thermal energy conversion in high vacuum flat solar thermal panels

Multilayers for efficient thermal energy conversion in high vacuum flat solar thermal panels

Thermal Emittance Measurement of Very Low-Emissive Materials for Solar Thermal Applications

An overview on energy and exergy analysis of solar thermal collectors with passive performance enhancers

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