This book discusses topics such as solar energy, heat transfer, solar cell and photovoltaic module, greenhouse-integrated semi-transparent photovoltaic thermal (GiSPVT) system for agriculture and aquaculture, GiSPVT solar dryer, and PVT water and air collector for water heating, air heating, biogas heating and swimming pool heating, etc. The book also discusses energy matrices, including EPBT, EPF, and LCCE. It includes pedagogical elements such as exercises, tables, and figures including problems and objective questions at the end of each chapter. Further, it includes the unit conversion from FPS system to SI unit of each parameter, namely length, energy, power, velocity, pressure force, etc., and some standard constants used in examples. Quasi steady state and periodic modeling of PVT technology described in the book is a useful reference for students, researchers, and academicians to design solar energy-based technology.