Heat exchanger with two-stage heat transfer

A heat exchanger to thermally condition a fluid medium, said heat exchanger including the combination of:

• a shell having an outer shell sidewall spaced from an internal shell sidewall both closed in a fluid tight manner by a first end wall for defining an outer heat exchange cavity and an inner heat exchange cavity, a second end wall joined with said outer shell sidewall in a fluid tight manner and spaced from said internal shell sidewall to form a fluid pervious flow space interconnecting said outer heat exchange cavity and said inner heat exchange cavity;
• shell conduits forming an inlet port and an outlet port for conducting a flow of a first fluid medium along each of said outer heat exchange cavity and said inner heat exchange cavity;
• an elongated tubular conduit permeating said shell in a fluid tight manner and having a tubular conduit portion traversing said internal shell sidewall between outer helical conduit convolutions resident in said outer heat exchange cavity and inner helical conduit convolutions resident said inner heat exchange cavity for conducting a second fluid medium in a heat transfer relation with said first fluid medium;
• and
• a flow controller supported by said second end wall and having a media dispersing wall forming an inner boundary to said inner heat exchange cavity for directing a flow of said first fluid medium along said inner heat exchange cavity.