Optical Properties of CuS Nanofluid for Spectral Splitting Photovoltaic/Thermal Hybrid System
Abstract
Spectral splitting medium is very important in the solar energy spectral splitting photovoltaic/thermal hybrid system. Existing nanofluid as a medium including ZnO, ZrO, TiN and MgO did not have an ideal absorption effect in infrared band, which made the photothermal units fail to obtain higher temperatures. Due to good thermal conductivity and modulable spectral radiation characteristics, CuS is proposed as an alternative nanofluid in a PV/T hybrid system. To ensure the suitability of such nanofluid, the optical properties and its performance need to be observed. Therefore, the UV3600 spectrophotometer was used to measure the collimated transmissivity, hemispherical transmissivity and hemispherical reflectivity. The results showed that 10 mm thick of CuS nanofluid had completely different selective absorption characteristics from water. Collimated transmissivity, hemispherical transmissivity and hemispherical reflectivity decrease drastically at the PT band which give more than 90% absorption. Due to the stronger scattering effect of CuS nanoparticles in visible band, the hemispherical transmissivity of CuS nanofluid is slightly larger than collimated transmissivity, which the difference between their maximum values is 5%. These optical properties provide strong support for the wide application of CuS nanofluid in the spectral splitting photovoltaic/thermal hybrid technology.
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