Heat exchange assembly

A heat exchange assembly to allow heat exchange with a fluid to pass through said assembly comprising:

• (a) a plurality of headers sequentially numbered from a first header to a last header, each header being elongated, having sealed ends, and comprising
• two pipes of circular cross-section sealably and fixedly connected along their lengths to each other at a single line of contact, each having an interior and a pipe wall, a longitudinal array of inlet holes passing through said pipe wall of one of said two pipes and a longitudinal array of outlet holes passing through said pipe wall of said other of said two pipes, with each pipe wall further having an elongate aperture therethrough running throughout the entire length of the pipe;
• and
• at least one plate member sealably affixed to both said pipes so that an inner chamber is defined by said sealed ends, said pipe walls, and said at least one plate member whereby fluid communication is provided through said chamber traverse to the longitudinal from said inlet holes to said outlet holes through said interior and said elongate aperture of both pipes,
• (b) a plurality of tubes consisting of connecting tubes, entrance tubes and departure tubes,
• wherein one end of an entrance tube is received in each of the inlet holes of the first header, one end of a departure tube is received in each of the outlet holes of the last header, and each outlet hole of each header other than the last header receives one end of a connecting tube the other end of which is received in an inlet hole of the next higher sequentially numbered header,
• whereby said fluid may pass from said entrance tubes through said headers in increasing numerical succession to the departure tubes.