MoS2-based nanofluids as heat transfer fluid in parabolic trough collector technology

Concentrating solar power is becoming one of options for producing energy to replace conventional polluting energy sources. However, improving the efficiency and reducing the cost of technologies based on this type of energy to make it more competitive is still a work in progress. This study proposes replacing the thermal oil used as the heat transfer fluid in the absorber tubes of parabolic trough solar collectors (PTCs) with nanofluids based on spherical molybdenum disulphide nanoparticles with the aim of improving the thermal efficiency of concentrating solar power plants. The colloidal stability of the nanofluids was verified by Ultraviolet-Visible spectroscopy, Zeta potential and Dynamic Light Scattering monitoring. The presence of spherical MoS2 nanoparticles resulted in an increase of up to 13% in specific isobaric heat and 6% in thermal conductivity compared to thermal oil. Finally, the efficiency of parabolic trough solar collectors was estimated to increase by 5%, which also favours the decrease of pumping power and the elimination of selective coatings on the absorber tube. To our knowledge, this is the first time that MoS2-based nanofluids are tested as heat transfer fluids in PTCs analysing its implementation in the solar energy application. (C)& nbsp;2022 The Authors. Published by Elsevier Ltd.

Automated summary

Concentrating solar power, as an alternative to conventional polluting energy sources, is being studied extensively. This study proposes the use of nanofluids based on spherical molybdenum disulphide nanoparticles as the heat transfer fluid in parabolic trough solar collectors (PTCs) to improve the thermal efficiency of concentrating solar power plants. Experimental results show that the nanofluids significantly enhance the thermal efficiency and bring additional advantages such as reduced pumping power and elimination of selective coatings on absorber tubes.