Reversible grooved tubes for heat exchangers

Details Reversible grooved tubes for heat exchangers Reversible grooved tubes for heat exchangers

2006-05-23

2006-05-23

Duong, Tho (Department: 3743)

Heat exchange

Tubular structure

With discrete heat transfer means

C165S133000

Reexamination Certificate

active

07048043

ABSTRACT:
Grooved metal tubes (1), of outer diameter De, the tubes being grooved internally with N helical ribs (2) of an apex angle α, height H, base width LNand helical angle β, two consecutive ribs being separated by a flat-bottomed groove (3) of width LR, with a pitch P equal to LR+LN. These tubes are characterised in that,a) De is between 4 and 20 mm,b) the number N of ribs ranges from 46 to 98,c) the rib height H ranges from 0.18 mm to 0.40 mm,d) the apex angle α ranges from 15° to 30°,e) the helical angle β ranges from 18° to 35°. These tubes make it possible to simultaneously obtain a high heat exchange coefficient in evaporation and condensation and a low pressure loss.

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