Grooved tubes for heat exchangers for single-phased typically aqueous fluids

metal tubes (1) slotted thickness Tf in groove bottom, outside diameter, typically intended for the manufacture of heat exchangers using a fluid cooler or heat carrier phase type, grooved interiorly by N helical ribs (2 ) of apex angle alpha, height H, of base width LN and angle beta helix, two consecutive ribs separated by a slot (3) with typically flat bottom of width LR being with a pitch P equal to LR + LN, characterized in that: -a) of said tube thickness Tf is such that Tf / De is equal to 0, 023 ñ 0, 005, Tf and De being expressed in mm, with De going from 4mm to 14, 5 mm, - b) said ribs are of height H such that H / De is equal to 0, 028 ñ 0, 005, and De being H in mm, c) the number N of ribs is such that N / De is equal to 2, 1 ñ 0, 4, with the corresponding pitch P equal to PIDI / N; with Di equal to De-2 where Tf and expressed in mm, - d) said widths LN and LR base are such that LN / LR is between 0, 20 and 0, 80, -e) said angle alpha apex ranging from 10 ° to 50 °, and - f) said helix angle beta is 20 ° to 50 °, so that is suitable for use as a fluid cooler or heat carrier a typically single-phase fluid comprising typically water or glycol water, so that simultaneously obtain a high heat exchange coefficient in heating and in cooling and a low head loss, and so that a weight / meter having low.