Abstract: A compact gas-gas heat exchange tube. The heat exchange tube includes a heat transfer tube which is configured to separate an in-tube fluid from an out-tube fluid, and achieve, through convection and heat conduction manners, heat transfer between the in-tube fluid and the out-tube fluid; an inner fin set which is configured to expand a heat exchange surface on an inner side of the heat transfer tube, form a micro-channel to separate the in-tube fluid to make the same to axially flow along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well; an outer fin set which is configured to expand a heat exchange surface on an outer side of the heat transfer tube, form a micro-channel to restrict the out-tube fluid from axially and reversely flowing along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well, wherein a hole is provided on each fin of the inner fin set or/and the outer fin set.

Abstract: A finned heat exchanger tube, including a tube, a plurality of fins, and a plurality of outer casings. The tube includes an elongated hollow body having a wall. The plurality of fins is disposed on the wall of the tube along the longitudinal axis of the tube; the plurality of fins each includes a plurality of hollow protrusions, and corresponding hollow protrusions of the plurality of fins form a plurality of microchannels parallel to the longitudinal axis of the tube. The plurality of outer casings encircles the plurality of fins, respectively.

Abstract: A finned heat exchanger tube, including a tube, a plurality of fins, and a plurality of outer casings. The tube includes an elongated hollow body having a wall. The plurality of fins is disposed on the wall of the tube along the longitudinal axis of the tube; the plurality of fins each includes a plurality of hollow protrusions, and corresponding hollow protrusions of the plurality of fins form a plurality of microchannels parallel to the longitudinal axis of the tube. The plurality of outer casings encircles the plurality of fins, respectively.