Carbon nanotubes for evacuated tube solar collector

The usage of carbon nanotubes (CNTs) in evacuated tube solar collectors (ETSCs) is this chapter's major subject. An overview of the subject is given in the introduction, which highlights the importance of solar energy and the possibility of using CNTs to enhance solar energy systems. The properties of CNTs are next examined, with an emphasis on their thermal conductivity and how temperature, concentration, and CNT geometries impact them. On CNT properties, the impacts of chemical and physical treatment techniques are also covered. The study of CNTs in nanofluids is then studied. This section discusses CNT nanofluid production techniques, including those for hybrid CNT nanofluids, and it emphasizes the benefits of employing CNT nanofluids. Next, it looks at how CNTs are used in different kinds of ETSCs. This comprises ETSCs made of U-tubes, thermosyphons, and heat pipes. Also presented are the ETSCs' economic, environmental, and life cycle analyses. This chapter concludes by giving a thorough review of solar energy systems utilizing CNTs. It draws attention to the potential advantages of employing CNTs to improve thermal conductivity and effectiveness in various solar energy systems.