Heat transfer enhancement by radiation structures for an air channel of LMR decay heat removal Original Research Article

To increase the capacity of decay heat removal of a LMR system that uses a natural air circulation cooling, feasibility of heat transfer enhancement has been studied for a planar air channel by introducing a new channel configuration using radiation–convection structures of compact heat transfer surface. For the new channel configuration, the heat transfer mechanism has been investigated and design guides for the radiation–convection structure have been developed based on the investigation results. Following the developed design guides, a new radiation–convection structure has been also devised. Analysis of the air channel cooling with the new radiation structures revealed substantial heat transfer enhancement and the feasibility of the heat transfer enhancement with the new channel configuration design has been confirmed.