Slotted tube with reversible usage for heat exchangers

Details Slotted tube with reversible usage for heat exchangers Slotted tube with reversible usage for heat exchangers

F - Mech Eng,Light,Heat,Weapons

28

F

F28F 1/40 (2006.01)

Patent

CA 2474558

The invention relates to metallic slotted tubes (1) having an outer diameter De. The inventive tubes are slotted internally by N helical ribs (2) having an apex angle .alpha., height H, base width LN and helix angle .beta., said consecutive ribs being separated by means of a slot (3) comprising a flat base of width LR, with a pitch P which is equal to LR + LN. Said tubes are characterised in that: a) De is between 4 and 20 mm, b) the number N of ribs is between 46 and 98, c) the height H of said ribs is between 0.18 mm and 0.4 mm, d) the apex angle .alpha. is such that 15.ordm. <= .alpha. < 30~, and e) the helix angle .beta. is between 18~ and 35~. Said tubes can be used to obtain simultaneously a high heat exchange coefficient in evaporation and condensation and a low pressure drop.

Les tubes métalliques (1) rainurés, de diamètre extérieur De, les dits tubes étant rainurés intérieurement par N nervures hélicoïdales (2) d'angle d'apex .alpha., de hauteur H, de largeur de base L¿N? et d'angle d'hélice .szlig., deux nervures consécutives étant séparées par une rainure (3) à fond plat de largeur L¿R?, avec un pas P égal L¿R? + L¿N?, sont caractérisés en ce que a) De est compris entre 4 et 20 mm, b) le nombre N de nervures va de 46 à 98, c) la hauteur H des nervures va de 0,18 mm à 0,40 mm, d) l'angle d'apex .alpha. tel que 15.ordm. .alpha.< 30·, e) l'angle d'hélice .szlig. va de 18· à 35·. Ces tubes permettent d'obtenir simultanément un coefficient d'échange thermique élevé en évaporation et en condensation, et une faible perte de charge.

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