Heat exchanger

A heat exchanger for cooling a first fluid by a second fluid, said heat exchanger comprising an elongate core assembly extending along a first axis and housed within a shell, said core assembly having:

• a plurality of spaced apart tubes in a closed path aligned generally with said first axis and extending between a first inlet, for introducing said first fluid into the tubes, and a first outlet, for exit of said first fluid from the tubes;
• a plurality of flow means disposed between and in thermal contact with said tubes, said flow means adapted to pass said second fluid across said core assembly about at right angles to said first axis and to allow heat transfer between the tubes and the second fluid;
• and
• baffle means engaged with the exterior of said tubes,
• the arrangement being such that said second fluid enters the core assembly by a second inlet, propagates through the core assembly generally in the direction of the first axis, and exits the core assembly through a second outlet, wherein the baffle means cause the second fluid to move along said first axis in a tortuous path, along which the second fluid is allowed to absorb heat from the flow means and the tubes so as to cool the first fluid.