This textbook is intended for master's level engineering students in the field of their studies. It begins with an analysis of the growing world population's energy demand (heat and electricity) and its connection to the undeniable climate change, necessitating the expansion of climate-friendly technologies. The book is divided into two sections. The first section (Chapters 2 to 7) presents the physical fundamentals of solar thermal energy usage, along with the necessary processes, methods, and models. The second section (Chapters 8-12) covers the synthesis of the developed fundamentals...