Heat transfer tube for absorber

Details Heat transfer tube for absorber Heat transfer tube for absorber

1994-12-13

1997-01-07

Rivell, John

Heat exchange

Tubular structure

Projecting internal and external heat transfer means

165181, F28F 142

Patent

active

055907113

ABSTRACT:
A heat transfer tube for an absorber, including a plurality of crest portions and trough portions extending in parallel to each other in an axial direction of the tube and arranged alternately in a circumferential direction of the tube. The ratio d/P of a depth d of each of the trough portions to a pitch P of the crest portions defined as P=.pi.D
is set in the range of 0.1 to 0.4; the depth d is set in the range of 1.50 to 2.00 mm; the ratio R.sub.2 /d is set in the range of 2.5 to 6.0; the ratio R.sub.1 /R.sub.2 is set larger than 1, where n represents a positive integer, R.sub.1 represents a radius of curvature of an outer top surface of each crest portion, R.sub.2 represents a radius of curvature of an outer bottom surface of each trough portion, and D represents a diameter of a circumscribed circle of the crest portions. Accordingly, the turbulence (Marangoni convection) of the absorbing liquid can be promoted, the wetted area can be widened, and the residence time of the absorbing liquid can be optimized, thereby improving the heat transfer performance.

REFERENCES:
patent: 3177936 (1965-04-01), Walter
patent: 3217799 (1965-11-01), Rodgers
patent: 3273599 (1966-09-01), Heeren
patent: 3779312 (1973-12-01), Withers, Jr. et al.
patent: 3875997 (1975-04-01), Newson et al.
patent: 4245697 (1981-01-01), Togashi
patent: 4827074 (1989-05-01), Suwa et al.
patent: 4858682 (1989-08-01), Odelstam
patent: 5353865 (1994-10-01), Adiutori et al.

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