Dr. Zafar Said is an Associate Professor in the Sustainable and Renewable Energy Engineering Department, at the University of Sharjah, United Arab Emirates, and also serves as the coordinator of the Functional Nanomaterials’ Synthesis Lab. His work is in the field of renewable energy, energy and exergy analysis, solar energy (solar collectors, energy efficiency, efficiency improvement), heat transfer, nanofluids (thermophysical properties, optical properties, applications), under-hood thermal management (radtherm, hypermesh, radiator, exhaust system and vehicle simulation model), active thermography (pulse thermography, lock-in thermography, composite structures), and 3D printing. Dr. Zafar is an Editorial Board Member for several ISI Journals, and also served as a guest editor for several special issues on Journals such as Frontiers, MDPI, and more. Dr. Arun Kumar Tiwari is as a Professor at the Mechanical Engineering Department, Institute of Engineering & Technology, Dr. A.P.J. Abdul Kalam Technical University, India. Dr. Tiwari completed his PhD in mechanical engineering from the Indian Institute of Technology and M. Tech in mechanical engineering from Indian Institute of Technology. His research interests include solar thermal energy, nanofluidics (characterization, application, and thermophysical & optical properties) and heat exchangers. He has published numerous articles on reputable journlas, such as Physics Report, Renewable and Sustainable Energy Reviews, Energy Conversion and Management and more.