A regenerator matrix for effecting the transfer of heat between two counter-flowing air streams separated in part by face seals. The matrix includes strips of material wound about an axis so as to provide a plurality of layers. The matrix also includes embossments located on at least some of the layers...http://www.google.fr/patents/US6892795?utm_source=gb-gplus-shareBrevet US6892795 - Embossed regenerator matrix for heat exchanger
