Low cost high intensity LED illumination device for high uniformity solar testing

D’Alessandro, Carmine; Mundo, Teresa; Musto, Marilena; Giamberardino, Francesco Di; Monti, Matteo; Dalena, Davide; Palmieri, V.G.; Luca, Daniela De; Gennaro, Emiliano Di; Russo, R.

doi:10.1016/j.solener.2021.04.017

Cited by 14 publications

(5 citation statements)

References 28 publications

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“…The vacuum is obtained by a turbomolecular pump that keeps the pressure below 10 -2 Pa to reduce to a negligible level both convective and conductive losses of internal gas. A LED array system [15], consisting in 4 identical LED arrays is used as a controlled source of heating (fig. 2).…”

Section: Methodsmentioning

confidence: 99%

“…In this work, the absorptance ( ) and spectral averaged emissivity ( ̅ ( )) of a recently developed SSA [13] at its working temperature were estimated, by means of the Mini Test Box (MTB) system [13,14]. It is an home-made calorimetric emissometer which reproduces a flat plate collector under high vacuum conditions and equipped with a calibrated LED array system [15] as artificial light source. According to Eq.…”

Section: Introductionmentioning

confidence: 99%

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<strong></strong>Characterization and Thermal Aging Tests of Cr Based Multilayer for Unconcentrated Solar Thermal Applications

Caldarelli

D’Alessandro

Maio

et al. 2021

Preprint

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Optical characterization and thermal aging tests are performed on a sputter-deposited coating, consisting of SiO2/Cr2O3/Cr/Cr2O3 layers, designed and developed as a selective solar absorber to be used for unconcentrated solar thermal applications. Both measurements are performed by using a home-made apparatus, which mimics a flat plate collector under high vacuum. A Performance Criterion (PCη(T)), based on absorber efficiency is proposed, and a forecast of service lifetime is obtained. As a result of the thermal aging tests, the selective solar absorber under study appears to be highly efficient at mid temperatures (up to 573 K) and thermally stable at temperatures (up to 690 K).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

<strong></strong>Characterization and Thermal Aging Tests of Cr Based Multilayer for Unconcentrated Solar Thermal Applications

Caldarelli

D’Alessandro

Maio

et al. 2021

Preprint

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“…When deriving the thermal efficiency formula of MT-Power, the optical properties of the SSA, such as absorptance α and effective emittance ε e (T), were obtained through calorimetric measurements following the procedure described in [31,32].…”

Section: Application Of Proposed Hvfpcs Efficiency Model To Mt-power ...mentioning

confidence: 99%

Formulation of an Efficiency Model Valid for High Vacuum Flat Plate Collectors

Gaudino,

Caldarelli,

Russo

et al. 2023

Energies

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High Vacuum Flat Plate Collectors (HVFPCs) are the only type of flat plate thermal collectors capable of producing thermal energy for middle-temperature applications (up to 200 °C). As the trend in research plans is to develop new Selective Solar Absorbers to extend the range of HVFPC application up to 250 °C, it is necessary to correctly evaluate the collector efficiency up to such temperatures to predict the energy production accurately. We propose an efficiency model for these collectors based on the selective absorber optical properties. The proposed efficiency model explicitly includes the radiative heat exchange with the ambient, which is the main source of thermal losses for evacuated collectors at high temperatures. It also decouples the radiative losses that depend on the optical properties of the absorber adopted from the other thermal losses due to HVFPC architecture. The model has been validated by applying it to MT-Power HVFPC manufactured by TVP-Solar. The dissipative losses other than thermal radiation were found to be mostly conductive with a linear coefficient k = 0.258 W/m2K. The efficiency model has been also used to predict the energy production of HVFPCs equipped with new, optimized Selective Solar Absorbers developed in recent years. Considering the 2019 meteorological data in Cairo and an operating temperature of 250 °C, the annual energy production of an HVFPC equipped with an optimized absorber is estimated to be 638 kWh/m2.

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“…[16][17][18] Therefore, engineering concepts such as geometrical overlapping and arrangement of light sources, usage of multiple-curvature lenses or reflector concepts can be deployed to increase the uniformity of illumination across the screening area. [19][20][21][22][23] Ensuring uniform illumination over larger areas depicts a tremendous challenge. 24,25 Since the activity of a photochemical system scales in a linear fashion with the absorbed photon flux within the photon limited regime of a photoreaction, screening setups must be at least sufficiently characterized from a photonic standpoint to take irradiation inhomogeneities into account.…”

Section: From Screening Photoreactors To Scaled-up Photochemical Proc...mentioning

confidence: 99%

Making photocatalysts screenable – a milliscale multi-batch screening photoreactor as extension for the modular photoreactor

Kowalczyk,

Knorr,

Peneva

et al. 2023

React. Chem. Eng.

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Low cost high intensity LED illumination device for high uniformity solar testing

Cited by 14 publications

References 28 publications

<strong></strong>Characterization and Thermal Aging Tests of Cr Based Multilayer for Unconcentrated Solar Thermal Applications

<strong></strong>Characterization and Thermal Aging Tests of Cr Based Multilayer for Unconcentrated Solar Thermal Applications

Formulation of an Efficiency Model Valid for High Vacuum Flat Plate Collectors

Making photocatalysts screenable – a milliscale multi-batch screening photoreactor as extension for the modular photoreactor

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