| 摘要 |
A heat exchange plate includes main protrusions, intermediate protrusions and non-protruded portions. The main protrusions having a truncated cone or pyramid shape are placed in positions based on a pattern on the plate. The intermediate protrusion is placed between two main protrusions that are adjacent to each other at a shortest distance so that the main protrusion is connected to two other main protrusions through two intermediate protrusions. The intermediate protrusion is defined by a flat portion extending to opposing surfaces of the two main protrusions. The intermediate protrusion has a peak portion placed in a lower position than a top of the main protrusion. The non-protruded portion is placed between adjacent intermediate protrusions. The non-protruded portion is placed in a lowest position relative to a protruding direction of the main and intermediate protrusions so as to provide a recess surrounded by the main and intermediate protrusions.
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