Abstract: Tube heat exchanger comprising finned tubes, wherein the tubes extend in a certain axial direction and are provided with heat exchange fins. Each fin has a heat exchange surface surrounding a tube that extends in a certain radial direction in relation to the tube and which is relief structured to form grooves spaced apart from one another in said radial direction. The grooves of a fin have different dimensions that decrease on moving away from the tube in said radial direction so as to form a guide for a fluid around the tube.

Abstract: The method of vaporizing LNG consists in using previously dehumidified ambient air as a direct heat exchange fluid in a first air heat exchanger (5) for heating said LNG to a certain temperature. The dehumidification of the ambient air consists in reducing the temperature of the air in a second air heat exchanger (4) by direct heat exchange with said LNG previously heated in said first heat exchanger (5) at least to said certain temperature, said certain temperature lying approximately in the range ?10° C. to ?25° C.

Abstract: The invention relates to a method for vaporising a cryogenic fluid, in particular liquefied natural gas that comprises the following steps: supplying heat from ambient air to a heat-transfer intermediate fluid in a first heat exchanger (3); supplying heat from said intermediate fluid to the cryogenic fluid in a second heat exchanger (5) in order to vaporise the cryogenic fluid. The intermediate fluid is fed into the second heat exchanger (5) after being compressed, and is fed into the first heat exchanger (3) after the expansion thereof in order to prevent rime formation.

Abstract: Tube heat exchanger comprising finned tubes, wherein the tubes extend in a certain axial direction and are provided with heat exchange fins. Each fin has a heat exchange surface surrounding a tube that extends in a certain radial direction in relation to the tube and which is relief structured to form grooves spaced apart from one another in said radial direction. The grooves of a fin have different dimensions that decrease on moving away from the tube in said radial direction so as to form a guide for a fluid around the tube.