Abstract: A fluid heating system assembly includes a first tube sheet, a second tube sheet opposite the first sheet, a plurality heat exchanger tubes, which connect the first tube sheet and the second tube sheet, and a plurality of baffles, comprising at least one plate baffle and at least one annular baffle disposed between the first tube sheet and the second tube sheet, wherein the heat exchanger tubes sealingly pass through the baffles, and wherein the tubes are arranged in a staggered ring configuration and the baffles have a baffle spacing, such that there is a substantially uniform temperature distribution and efficient exchange of thermal energy across the heat exchanger tube walls.

Abstract: A heat exchanger tube assembly comprising a first tube sheet, a second tube sheet opposite the first sheet, a plurality of heat exchanger tubes, each independently connects the first tube sheet and the second tube sheet, wherein the tubes are in a staggered ring configuration that comprises a concentric sequence of rings of decreasing diameter wherein adjacent tubes on the same ring are separated by a fixed radial separation angle and adjacent tubes on adjacent rings are staggered by rotating all the tubes within an inner ring by a fixed radial index angle, IA, relative to the next outermost tube ring.