Development of Research on Graphene-Based Nanofluids as Heat Carriers in Direct Absorption Solar Collectors

This study considers the potential application of graphene nanofluid as a heat transfer medium in direct absorption solar collectors. It is found that graphene nanofluid has superior absorption ability in interaction with monochromatic (520 nm) and near infrared radiation. The use of graphene nanofluid as working fluid compared to distilled water in the direct absorption solar collector increased its efficiency even at very low concentration of dispersed phase particles. However, in order to apply graphene nanofluid in energy systems as a working fluid, some issues need to be addressed, primarily related to its low stability and thermal instability.