"介质加热法" can be translated as "dielectric heating method" or "medium heating method" in English, depending on the context.
"Dielectric heating method" is more specific and commonly used in technical and scientific contexts, especially when referring to the heating of non-conductive materials through the interaction of electromagnetic fields with the dielectric properties of the material.
"Medium heating method" is a more general term that could be used in a broader range of contexts, where "medium" refers to the material or substance through which heat is transferred or in which heating occurs.
In most technical or scientific discussions related to heating processes, "dielectric heating method" would be the more appropriate and precise translation.