Arrangements for cross-flow heat exchanger units

A cross-flow heat exchanger arrangement comprising:

• a housing;
• primary and secondary flow channels passing through said housing, each said flow channel having ends;
• said primary flow channel having a primary flow port at each end, said secondary flow channel having a secondary flow port at each end;
• a plurality of heat exchanger units in said housing, each heat exchanger unit including a set of primary flow passageways extending in one direction and a set of secondary flow passageways extending in another direction, said sets of first and second flow pasageways each being portions of said first and second flow channels, respectively, said first and second flow passageways providing a relatively intensive exchange of heat, said primary and secondary flow channels having remaining portions serving for inflow and outflow;
• said remaining portions of said primary flow channel including first, second and third primary segments, said first primary segment extending between one primary port of said primary flow channel and said primary flow passageways of one heat exchanger unit to establish communication therebetween, said second primary segment extending between said one primary port of said primary flow channel and said set of primary flow passageways of another heat exchanger unit to establish communication therebetween, said third primary segment extending between the other primary port of said primary flow channel, on the one hand, and said sets of primary passageways of both said one and said other heat exchanger units, on the other hand, to establish communication therebetween, so that said set of primary flow passageways of said one heat exchanger unit is fluidly coupled in parallel with said set of primary flow passageways of said other heat exchanger unit and so that a fluid flow path is established which is divided between one primary branch including said one heat exchanger unit and another primary branch including said other heat exchanger unit in which fluid flowing between said one primary port and said other primary port through said one primary branch passes only through said one heat exchanger unit and in which fluid flowing between said one primary port and said other primary port through said other primary branch passes only through said other heat exchanger unit;
• said remaining portions of said secondary flow channel including first, second and third secondary segments, said first secondary segment extending between one secondary port of said secondary flow channel and said set of secondary flow passageways of said one heat exchanger unit to establish communication therebetween, said second secondary segment extending between said one secondary port of said secondary flow channel and said set of secondary flow passageways of said other heat exchanger unit to establish communication therebetween, said third secondary segment extending between the other secondary port of said secondary flow channel, on the one hand, and said sets of secondary passageways of both said one and said other heat exchanger units, on the other hand, to establish communication therebetween, so that said set of secondary flow passageways of said one heat exchanger unit is fluidly coupled in parallel with said set of secondary passageways of said other heat exchanger unit and so that a fluid flow path is established which is divided between one secondary branch including said one heat exchanger unit and another secondary branch including said other heat exchanger unit in which fluid flowing between said one secondary port and said other secondary port through said one branch passes only through said one heat exchanger unit and in which fluid flowing between said one secondary port and said other secondary port through said other secondary branch passes only through said other heat exchanger unit.