[en] The present invention relates to the technical field of phase-change thermal energy storage, and specifically to a solar photothermal conversion phase-change thermal storage structure based on full-spectrum regulation and a preparation method thereof. The invention addresses the problems of how to practically reduce radiative heat dissipation from the material surface and how to reduce radiative heat loss without compromising light absorption.
The structure comprises a photothermal conversion thermal storage unit and a spectral regulation unit. The spectral regulation unit is integrally arranged on the upper surface of the photothermal conversion thermal storage unit. The photothermal conversion thermal storage unit is a photothermal conversion phase-change material, which is configured to spontaneously convert solar radiation into heat and store the heat. The spectral regulation unit has different transmittance and reflectance for different radiation wavelength ranges.
As a result, the photothermal conversion surface of the thermal storage unit exhibits high solar absorptance in the wavelength range of 0–2.5 μm, while exhibiting low emissivity in the infrared radiation wavelength range above 2.5 μm. Therefore, the radiative heat loss of the photothermal conversion phase-change energy storage material is reduced while maintaining high light absorptance.
