A ribbed construction assembled from sheet metal bands for improved heat transfer, suitably built into the pipes of heat exchangers forms the arrangement of the invention. The ribbed construction assembled from toothed metal bands ensures the improved heat transfer primarily by slowing down the velocity...http://www.google.es/patents/US4352378?utm_source=gb-gplus-sharePatente US4352378 - Ribbed construction assembled from sheet metal bands for improved heat transfer
Ribbed construction assembled from sheet metal bands for improved heat transfer
