for coolant it should be appreciated therefore that selection of the height of the projections may readily allow different size flow channels 72 78 for easy adaptation of the present invention for different applications and heat exchange media in the depicted practical examples the height h of the projections 60 and 62 is identical but it should be appreciated that this is not essential to the present invention the height h of the projections 62 in an undepicted practical example could be identical to the height h of the projections 76 in which case the projections 62 would lie against the heat exchanger plate 24 and could be connected to it positioning of the individual projections 60 62 in the illustrated embodiment may advantageously be in different alternating rows 80 82 viewed in the longitudinal direction 84 of the plate 22 for example as illustrated rows 80 that are formed only from square projections 62 and alternating rows 82 include alternating circular projections 60 and square projections 62 the rows 80 82 may advantageously be arranged as mirror images of each other relative to the center 86 of the heat exchanger plate 22 it should be understood however that a different sequence and arrangement of projections 60 and 62 could also be chosen within the scope of the present invention with optimization of the arrangement.