Heat exchanger with crossing heat exchange tubes

A heat exchanger, comprising:

• a first manifold including a first manifold wall and a first manifold plenum, the first manifold wall between and partially forming the first manifold plenum and a flowpath;
• a second manifold including a second manifold wall and a second manifold plenum, the second manifold wall between and partially forming the second manifold plenum and the flowpath;
• and
• a plurality of tubes extending vertically across the flowpath and connected to the first manifold wall and the second manifold wall, each of the plurality of tubes having an internal passage fluidly coupling the first manifold plenum to the second manifold plenum, and the plurality of tubes including a first tube and a second tube that is angularly offset from the first tube within the flowpath;
• the first tube extending along a straight first trajectory out from the first manifold wall, through the flowpath and to the second manifold wall;
• and
• the second tube extending along a straight second trajectory out from the first manifold wall, through the flowpath and to the second manifold wall.

A heat exchanger, comprising:

• a first manifold including a first manifold wall and a first manifold plenum, the first manifold wall between and partially forming the first manifold plenum and a flowpath;
• a second manifold including a second manifold wall and a second manifold plenum, the second manifold wall between and partially forming the second manifold plenum and the flowpath;
• and
• a plurality of tubes extending vertically across the flowpath and connected to the first manifold wall and the second manifold wall, each of the plurality of tubes having an internal passage fluidly coupling the first manifold plenum to the second manifold plenum, and the plurality of tubes including a first tube and a second tube;
• the first tube angularly offset from the second tube at a first location vertically between the first manifold wall and the second manifold wall;
• the first tube attached to the second tube at the first location;
• and
• the internal passage of the first tube fluidly uncoupled from the internal passage of the second tube vertically between the first manifold wall and the second manifold wall.