Various research and development efforts in energy generation and utilization have been actively conducted in response to the problem of reducing CO2 emissions. Thermal energy, one form of energy, is indispensable for industry and consumer, but it is extremely difficult to store and transport, and low-temperature heat is discarded without being used. Under these circumstances, it is important not only to improve thermal efficiency but also to develop methods, processes, and management technologies to utilize unused heat without wasting in order to reduce CO2 emissions. In this symposium, we will hold a symposium on heat utilization processes such as thermal circuits, heat management technologies, and high-efficiency heat utilization, and will actively discuss heat utilization.