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US 5,960,870 AGranted
Heat transfer tube for absorber
AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsHiroyuki Takahashi, Mamoru Ishikawa, Chikara Saeki, Hiroyuki Kijima
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AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsHiroyuki Takahashi, Mamoru Ishikawa, Chikara Saeki, Hiroyuki Kijima
Estimating the term…
To provide a heat transfer tube for an absorber in which the quantity of residence of an absorbing liquid on the surface of the tube staying in trough portions is large, and the staying absorbing liquid is thinly and widely spread on the surface of the tube to materially promote an absorbing performance. On an outer surface of a metal tube having an outer diameter of D, a group of N (N is a natural number) number of trough portions, wherein the length L1 in a longitudinal direction of the tube is 70 mm.ltoreq.L1.ltoreq.130 mm, and the depth H is 0.23 mm.ltoreq.H<0.5 mm, is formed on a circumference of a circle formed in section of the tube in the case of being cut perpendicular to a longitudinal direction of the tube so that the pitch P (=.pi. D/N) is set in the range of 6.2 to 8.7 mm, said group of trough portions being formed in plural in a longitudinal direction of the tube, and said group of trough portions adjacent to the longitudinal direction of the tube being arranged so that the ends of each trough portion are entered each other.
A heat transfer tube for an absorber wherein on an outer surface of a metal tube having an outer diameter of D, a plurality of groups of N (N is a natural number) number of trough portions, wherein the length L1 in a longitudinal direction of the tube is 70 mm.ltoreq.L.ltoreq.130 mm, and the depth H is 0.23 mm.ltoreq.H<0.5 mm, is formed on a circumference of a circle formed in section of the tube, said groups each being arranged such that for a cut perpendicular to a longitudinal direction of the tube the pitch P(=.pi.D/N) is in the range of 6.2 to 8.7 mm, said groups of trough portions being spaced in a longitudinal direction of the tube, wherein adjacent ones of said groups in the longitudinal direction of the tube are arranged so that the ends of each trough portion of the adjacent groups overlap each other.
Dependencies are inferred from the claim text.