Abstract: The invention concerns a process for the production of open pore ceramic bodies, wherewith is applied onto the contacting areas of the pores of an open pore matrix body a hardenable ceramic mass, this latter next being hardened and the matrix body being removed, there remaining behind a ceramic body of hardened, open pore ceramic mass. Before curing the ceramic mass, the matrix body is furnished with filaments extending, at least in one spatial direction, into this matrix body, which are removed during or after curing of the ceramic mass while forming appropriate channels.

Abstract: A cooling tower panel made from fiber concrete or similar material has surfaces which incorporate bosses and coordinated depressions extending in lines. The water flowing across the panels has a large wetting surface available, and the water does not flow off the surfaces in laminar fashion either. To impart good heat exchange properties to the panel and to enable a low-cost manufacture, flattened or rounded points or the like protrude linewise from each of the two surfaces and are opposed by equal lines of depressions. Each panel surface features a plurality of both point lines and depression lines extending approximately parallel to each other.