RF Capacitive Heating Tunnel with Cold Air for Uniform Food Thawing

The patent replaces conventional thermal conduction (mechanical heat transfer) with capacitive RF electromagnetic field heating. The RF system generates an electromagnetic field that directly heats the food's water molecules throughout the volume simultaneously, eliminating the slow surface-to-core thermal conduction process and achieving rapid uniform thawing.

The patent transitions from one-dimensional surface-to-core heat transfer to three-dimensional volumetric heating. The capacitive RF system penetrates the food throughout its entire volume simultaneously, heating all regions in parallel rather than sequentially from the surface inward, dramatically reducing thawing time.

The patent applies different thermal conditions to different regions of the food. The capacitive RF system provides uniform volumetric heating throughout the core, while a controlled cold air environment is applied to the surface. This creates a deliberate temperature gradient that prevents surface overheating while ensuring complete core thawing, achieving uniform overall thawing.

The patent applies preliminary cooling action to the food surface through controlled cold air exposure before and during RF heating. This pre-cools the surface to counteract the rapid heating effect of RF energy, preventing the surface from thawing too quickly and ensuring synchronized thawing with the core.