the non continuous baffles which are non continuous helical baffles in a staggered form are configured by inner helical baffles 5 or inner shell pass helical baffles 25 in this example each fan shaped plate 25 b are staggered with respect to each other in a way shown in fig1 to form a non continuous staggered helical structure it behaves in a similar way as the example of fig1 fig1 a to fig1 c are schematic views of several types of multi hole circular baffles 25 g 25 h and 25 i which may be formed as the inner shell pass 219 baffles according to the present invention these multi hole circular baffles 25 g 25 h and 25 i may be disposed in the inner shell pass 219 inside of the first inner sleeve tube 210 of the present invention it can be seen from the three views of fig1 a to fig1 c that holes in these multi hole circular baffles 25 g 25 h and 25 i may have various shapes these holes allow heat exchanging tube bundles 23 to insert therethrough and allow fluid outside of the heat exchange tube bundles to pass through fig1 is a schematic view of non continuous baffle rods 25 e and 25 f forming the non continuous baffles in the inner shell pass 219 according to the invention the circular portions between the baffle rods are the cross section of heat exchanging.