A brazed plate heat exchanger and use thereof

Abstract

A brazed plate heat exchanger (100) includes a plurality of first and second heat exchanger plates (110, 120), wherein the first heat exchanger plates (110) are formed with a first pattern of ridges and grooves, and the second heat exchanger plates (120) are formed with a second pattern of ridges and grooves providing contact points between at least some crossing ridges and grooves of neighbouring plates under formation of interplate flow channels for fluids to exchange heat, said interplate flow channels being in selective fluid communication through port openings. The first pattern of ridges and grooves is different from the second pattern of ridges and grooves, so that an interplate flow channel volume on one side of the first heat exchanger plates (110) is different from an interplate flow channel volume on the opposite side of the first heat exchanger plates (110), and at least some of the ridges and grooves of the first pattern extend in a first angle (β1) and at least some of the ridges and grooves of the second pattern extend in a second angle (β2) different from the first angle (β1).

1 . A brazed plate heat exchanger comprising a plurality of first and second heat exchanger plates, wherein the first heat exchanger plates are formed with a first pattern of ridges and grooves, and the second heat exchanger plates are formed with a second pattern of ridges and grooves providing contact points between at least some crossing ridges and grooves of neighbouring plates under formation of interplate flow channels for fluids to exchange heat, said interplate flow channels being in selective fluid communication through port openings, wherein
 the first pattern of ridges and grooves is different from the second pattern of ridges and grooves, so that an interplate flow channel volume on one side of the first heat exchanger plates is different from the interplate flow channel volume on the opposite side of the first heat exchanger plates, and   at least some of the ridges and grooves of the first pattern extend in a first angle and at least some of the ridges and grooves of the second pattern extend in a second angle different from the first angle.   
     
     
         2 . The brazed plate heat exchanger of  claim 1 , wherein the interplate flow channels on one side of the first heat exchanger plates have a different cross section area than on the opposite side. 
     
     
         3 . The brazed plate heat exchanger of  claim 1 , wherein at least a central main heat exchanging section of the first heat exchanger plates exhibits the first angle, wherein at least a central main heat exchanging section of the second heat exchanger plates exhibits the second angle. 
     
     
         4 . The brazed plate heat exchanger of  claim 1 , wherein the first heat exchanger plates are symmetric. 
     
     
         5 . The brazed plate heat exchanger of  claim 1 , wherein the grooves of the first heat exchanger plates are formed with identical corrugation depth, wherein first grooves of the second heat exchanger plates are formed with a first depth, and second grooves of the second heat exchanger plates are formed with a second depth different from the first depth. 
     
     
         6 . The brazed plate heat exchanger of  claim 1 , wherein a depth of the grooves of the first heat exchanger plate is in the range of 0.6-2 mm. 
     
     
         7 . The brazed plate heat exchanger of  claim 1 , wherein a first depth of the second heat exchanger plate is in the range of 0.6-3 mm, and a second depth of the second heat exchanger plate is in the range of 30-80% of the first depth. 
     
     
         8 . The brazed plate heat exchanger of  claim 1 , wherein the first angle of the first pattern of ridges and grooves is in the range of 25-70°. 
     
     
         9 . The brazed plate heat exchanger of  claim 1 , wherein the second angle of the second pattern of ridges and grooves is in the range of 25-70°. 
     
     
         10 . The brazed plate heat exchanger of  claim 1 , wherein a difference between the first angle of the first pattern of ridges and grooves and the second angle of the second pattern of ridges and grooves is in the range of 2-35°. 
     
     
         11 . The brazed plate heat exchanger of  claim 1 , wherein the first and second heat exchanger plates are provided with different corrugation depths. 
     
     
         12 . The brazed plate heat exchanger of  claim 1 , wherein the heat exchanger plates are provided with different corrugation widths. 
     
     
         13 . The brazed plate heat exchanger of  claim 1 , wherein the first pattern is a first herringbone pattern or a first pattern of obliquely extending straight lines and the second pattern is a second herringbone pattern or a second pattern of obliquely extending straight lines, and wherein ridges and grooves of the first and second patterns extend from one long side of the heat exchanger plates to the other, and wherein the first angle is towards one short side of the heat exchanger plates and the second angle is towards the opposite short side. 
     
     
         14 . The brazed plate heat exchanger of  claim 1 , wherein the first and second heat exchanger plates are arranged alternatingly, wherein every other plate is a first heat exchanger plate and every other plate is a second heat exchanger plate throughout the heat exchanger. 
     
     
         15 . The brazed plate heat exchanger of  claim 1 , wherein brazing points between the first and second heat exchanger plates are elongated and arranged in a first orientation in the interplate flow channels having bigger volume and in a second orientation in the interplate flow channels having smaller volume. 
     
     
         16 . A method for exchanging heat by a brazed heat exchanger according to  claim 1 , wherein media is evaporated or condensed in the interplate flow channels of smaller volume, wherein liquid media is conducted to the interplate flow channels of bigger volume. 
     
     
         17 . (canceled)