Abstract: A tube heat exchanger comprising at least one tube extending along a certain axial direction, each tube being provided with heat exchange fins (4) spaced apart from one another along said axial direction and extending radially from said tube, each fins (4) being relief structured to form dimples and a groove/rib (5) arranged at a first distance from said tube, characterized in that said dimples (6) are placed on the outside of the groove/rib and arranged in at least one line surrounding the said groove/rib structure at a second distance from said tube greater than said first distance and in that said groove/rib (5) has a depth along said axial direction greater than the depth of said dimples (6).

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.