"Harnessing Solar Heat" is a comprehensive technical book that focuses on the utilization of solar heat through various technologies. It provides a detailed analysis of methods for converting solar energy into heat, which can be used directly or as an intermediate product for other applications such as electricity generation or cooling. This updated and expanded edition of the originally published work "Solar Energy Thermal Technology" from 1992 is based on extensive research by the author and his colleagues at renowned institutions such as Cranfield University and the Indian Institute of Technology. The initial chapters of the book cover fundamental aspects of solar energy technology, including meteorology, heat transfer, and energy storage. Subsequently, various solar collectors and their applications are discussed in detail, addressing practical challenges and analytical methods for performance forecasting.