Heat exchanger with crossing heat exchange tubes

Abstract

A heat exchanger is provided that a flowpath extending longitudinally through a duct. The flowpath extends laterally within the duct between a first sidewall and a second sidewall. The flowpath extends vertically within the duct between a first manifold wall and a second manifold wall. The first manifold wall is configured to form a peripheral boundary of a first manifold plenum outside of the duct. The second manifold wall is configured to form a peripheral boundary of a second manifold plenum outside of the duct. A plurality of tubes extend vertically across the flowpath and are connected to the first manifold wall and the second manifold wall. Each of the tubes has a bore configured to fluidly couple the first manifold plenum to the second manifold plenum. The tubes include a first tube and a second tube. The first tube is adjacent and angularly offset from the second tube.

What is claimed is: 
     
         1 . A heat exchanger, comprising:
 a duct including a flowpath, a first sidewall, a second sidewall, a first manifold wall and a second manifold wall, the flowpath extending longitudinally through the duct, the flowpath extending laterally within the duct between the first sidewall and the second sidewall, the flowpath extending vertically within the duct between the first manifold wall and the second manifold wall, the first manifold wall configured to form a peripheral boundary of a first manifold plenum outside of the duct, and the second manifold wall configured to form a peripheral boundary of a second manifold plenum outside of the duct; 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 a bore configured to fluidly couple the first manifold plenum to the second manifold plenum, the plurality of tubes including a first tube and a second tube, and the first tube adjacent and angularly offset from the second tube.   
     
     
         2 . The heat exchanger of  claim 1 , wherein at least one of the plurality of tubes is configured according to a heat exchange tube crossover parameter between 0.75 inches/crossover and 4.0 inches/crossover. 
     
     
         3 . The heat exchanger of  claim 1 , wherein the first tube is laterally adjacent the second tube. 
     
     
         4 . The heat exchanger of  claim 1 , wherein the first tube engages the second tube. 
     
     
         5 . The heat exchanger of  claim 1 , wherein the first tube is connected to the second tube at a first location within the flowpath vertically between the first manifold wall and the second manifold wall. 
     
     
         6 . The heat exchanger of  claim 5 , wherein
 the plurality of tubes further includes a third tube;   the first tube is adjacent and angularly offset from the third tube; and   the first tube is connected to the third tube at a second location within the flowpath vertically between the first location and the second manifold wall.   
     
     
         7 . The heat exchanger of  claim 5 , wherein a connection between the first tube and the second tube at the first location is a rigid connection. 
     
     
         8 . The heat exchanger of  claim 5 , wherein a connection between the first tube and the second tube at the first location is a compliant connection. 
     
     
         9 . The heat exchanger of  claim 1 , wherein the bore of the first tube is fluidly discrete from the bore of the second tube within the flowpath. 
     
     
         10 . The heat exchanger of  claim 1 , wherein the first tube is angularly offset from the second tube by a first acute angle. 
     
     
         11 . The heat exchanger of  claim 10 , wherein the first tube is angularly offset from the first manifold wall by a second acute angle. 
     
     
         12 . The heat exchanger of  claim 11 , wherein the second acute angle is greater than the first acute angle. 
     
     
         13 . The heat exchanger of  claim 1 , wherein the first tube extends along a straight first trajectory out of a first aperture in the first manifold wall, through the flowpath and into a first aperture in the second manifold wall. 
     
     
         14 . The heat exchanger of  claim 1 , wherein the second tube extends along a straight second trajectory out of a second aperture in the first manifold wall, through the flowpath and into a second aperture in the second manifold wall. 
     
     
         15 . The heat exchanger of  claim 1 , wherein
 the plurality of tubes are arranged into a plurality of first arrays and a plurality of second arrays that are laterally interposed with the plurality of first arrays;   the plurality of tubes arranged in the plurality of first arrays are parallel with one another;   the plurality of tubes arranged in the plurality of second arrays are parallel with one another;   one of the plurality of first arrays includes the first tube; and   one of the plurality of second arrays includes the second tube.   
     
     
         16 . 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.   
     
     
         17 . The heat exchanger of  claim 16 , wherein at least one of
 the first tube extends along the straight first trajectory through at least one of the first manifold wall or the second manifold wall; or   the second tube extends along the straight second trajectory through at least one of the first manifold wall or the second manifold wall.   
     
     
         18 . The heat exchanger of  claim 16 , further comprising:
 a heat exchanger housing including the first manifold wall and the second manifold wall;   the flowpath extending longitudinally through the heat exchanger housing.   
     
     
         19 . 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.   
     
     
         20 . The heat exchanger of  claim 19 , wherein at least one of
 the first tube extends along a straight first trajectory out from the first manifold wall, through the flowpath and to the second manifold wall; or   the second tube extends along a straight second trajectory out from the first manifold wall, through the flowpath and to the second manifold wall.