Heat exchanger for water pumping system

A heat exchanger comprising:

• an elongated body having an inlet opening at one end thereof and a discharge opening at the other end thereof,
• said body including a tubular portion extending between said inlet and discharge openings for defining a first heat exchange chamber internally thereof,
• a cover means spaced apart from and enclosing the exterior of said tubular portion to cooperate therewith to define a second heat exchange chamber,
• inlet means through which a liquid to be cooled may be supplied to said second heat exchange chamber, and
• outlet means through which a liquid to be cooled may be discharged from said second heat exchange chamber,
• said tubular portion having fin means providing an extended surface for effective heat exchange action,
• said fin means being located on both sides of said tubular portion to extend into both of said first and second heat exchange chambers,
• said fin means including a plurality of fins extending generally longitudinally of said tubular portion on both the inside and the outside thereof,
• said outside fins cooperating with said cover and said tubular portion to define a plurality of longitudinally extending conduits in said second heat exchange chamber through which the liquid to be cooled flows as it passes through said heat exchanger,
• said tubular portion being provided with divider wall portions for dividing said second heat exchange chamber into a plurality of flow compartments extending longitudinally of said tubular portion and crossover ports providing flow communication between adjacent flow compartments, said crossover ports being located so that the liquid to be cooled flows in opposite directions in adjacent ones of said flow compartments,
• said divider wall portions dividing said second heat exchange chamber into four flow compartments, there being three crossover ports arranged at the ends of said flow compartments so that said liquid to be cooled makes four passes longitudinally back and forth along said tubular portion.