Tubular heat exchanger

Abstract

A tube for a heat exchanger provided with a helical corrugation, wherein the helical corrugation has pitch and a width, and the width being at least 20% of the pitch, such that an improved heat transfer is achieved.

1 . A tube for a heat exchanger, said tube being provided with a helical corrugation, wherein
 the helical corrugation has pitch and a width, and the width being at least 20% of the pitch.   
     
     
         2 . The tube according to  claim 1 , wherein the width is 30 to 80% of the pitch. 
     
     
         3 . The tube according to  claim 2 , wherein the width is 30 to 70% of the pitch. 
     
     
         4 . The tube according to  claim 1 , wherein the outer diameter of the tube is between 1 and 4 cm. 
     
     
         5 . The tube according to  claim 4 , wherein the outer diameter is between 1 and 2 cm. 
     
     
         6 . The tube according to  claim 1 , wherein the pitch of the corrugation is in the interval of 1 to 4 cm. 
     
     
         7 . The tube according to  claim 6  wherein the pitch of the corrugation is in the interval of 2 to 3 cm. 
     
     
         8 . The tube according to  claim 1 , wherein the depth of the corrugation is in the interval of 0.5 to 2 mm. 
     
     
         9 . The tube according to  claim 1 , wherein the corrugation is symmetrical from a side view or longitudinal cross-sectional view of the tube. 
     
     
         10 . The tube according to  claim 1 , wherein the corrugation is asymmetrical from a side view or longitudinal cross-sectional view of the tube. 
     
     
         11 . A tube set comprising a number of tubes according to  claim 1 . 
     
     
         12 . The tube set according to  claim 11 , wherein said number of tubes is between 1 and 40. 
     
     
         13 . A heat exchanger for heat treating liquid food products, comprising a tube set according to  claim 11 . 
     
     
         14 . The heat exchanger according to  claim 13 , wherein a first tube set is connected to a second tube set by a connection tube, such that the first tube set is arranged in parallel with the second tube set. 
     
     
         15 . A processing system for reducing a number of microorganisms in a product, said processing system comprising a product inlet and a product outlet, and a heat exchanger according to  claim 13 , arranged downstream the inlet and upstream the outlet. 
     
     
         16 . The processing system according to  claim 15 , wherein the processing system is regenerative such that outcoming product acts as heating medium for incoming product. 
     
     
         17 . The processing system according to  claim 15 , wherein said product is milk.