Isenthalpic heating heat source, referred to as dry heat source, adopts energy-based cycle technology to realize infinite cyclic utilization of sensible heat and latent heat of energy, which greatly saves energy loss in the process of production and daily life. This technology is mainly used in air flow drying, such as fluidized bed and boiling drying, as well as various product drying, coating machines, etc. It converts moisture or organic substances in the production process from gaseous state to liquid state through isenthalpic transformation, and the released heat is used for reheating the drying gas. Generally, the temperature can rise from the ambient temperature to above 100℃.