Dimple chiller with secondary dimples

Abstract

A heat exchanger with at least one plate includes main dimples between which secondary dimples are formed which are flatter and/or smaller with respect to their dimensions as seen in a plan view. A depth of the secondary dimples may be at most 0.5 times a channel height and/or at most 0.5 times the depth of the main dimples.

1 .- 10 . (canceled) 
     
     
         11 . A heat exchanger with at least one plate having main dimples, between which secondary dimples are formed which are flatter and/or smaller with respect to their dimensions as seen in a plan view. 
     
     
         12 . The heat exchanger according to  claim 11 , wherein a depth of the secondary dimples is at most 0.5 times a channel height and/or at most 0.5 times a depth of the main dimples. 
     
     
         13 . The heat exchanger according to  claim 11 , wherein a distance between the main dimples and the secondary dimples in at least one direction is 1.9 to 2.5 mm. 
     
     
         14 . The heat exchanger according to  claim 11 , wherein one of the secondary dimples is formed in each case between two of the main dimples. 
     
     
         15 . The heat exchanger according to  claim 11 , wherein the main dimples are arranged in rows, and the secondary dimples are arranged on the rows of main dimples. 
     
     
         16 . The heat exchanger according to  claim 15 , wherein the rows of the main dimples are formed obliquely to at least one edge of the at least one plate. 
     
     
         17 . The heat exchanger according to  claim 11 , wherein a sheet thickness of the at least one plate in an area of the main dimples and/or the secondary dimples is less than between the dimples. 
     
     
         18 . The heat exchanger according to  claim 11 , wherein the main dimples and/or the secondary dimples have a circular, an elliptical, or an oval shape in plan view. 
     
     
         19 . The heat exchanger according to  claim 18 , wherein a main axis of the main dimples having the elliptical or the oval shape are parallel to an edge of the at least one plate, in particular a longer edge of a rectangular plate. 
     
     
         20 . The heat exchanger according to  claim 18 , wherein a main axis of the secondary dimples having the elliptical or the oval shape extend at an angle with respect to edges of a rectangular plate.