Abstract
This research gives a comprehensive overview about the recent advances related with the application of the nanotechnology in the direct absorption solar collectors. Papers reviewed including theoretical, numerical and experimental up to date works related with the nanotechnology applications in this kind of the solar collectors. A lot of literature are reviewed and summarized carefully in a useful table (Table 1) to give a panoramic overview about the role of the nanotechnology in improving the direct absorption solar collectors. It was found that the use of the nanofluid in the direct absorption solar collectors can play a crucial role in increasing the efficiency of these devices.