| 摘要 |
PCT No. PCT/SE88/00146 Sec. 371 Date Dec. 12, 1988 Sec. 102(e) Date Dec. 12, 1988 PCT Filed Mar. 25, 1988 PCT Pub. No. WO88/08508 PCT Pub. Date Nov. 3, 1988.In a plate heat exchanger, the heat exchange plates of which have been provided by pressing with a corrugation pattern comprising ridges (19a, 19b) and valleys (20a, 20b), the ridges and valleys of adjacent plates extend in parallel. In each plate interspace the ridges of adjacent plates abut against each other such that the opposing valleys form parallel flow passages in the plate interspace. The ridges of at least some of the heat exchanger plates are provided with depressions (21a, 21b), which form thresholds in the valleys formed on the opposite sides of the plates by the ridges. Thresholds of this kind are formed in the heat exchange plates such that they create a substantially larger flow resistance in the plate interspace for one the heat exchange medium than in the plate interspaces for the other heat exchange medium. |
