Claims
- 1. A hollow annular metal tube having a continuous circumferential wall, said wall having an inner surface and an outer surface, said wall containing a continuous passage located between said inner surface and said outer surface, said passage having a length at least 30% greater than the length of said tube and said wall having a continuous fluid-tight weld seam along its length wherein said inner surface is substantially free from protrusion of said passage, and wherein said tube has a plurality of fins attached to said outer surface thereof.
- 2. A heat exchanger for use with two or more fluids comprising a hollow annular metal tube having a continuous circumferential wall, said wall having an inner surface and an outer surface, said wall containing a continuous passage located between said inner surface and said outer surface, said passage having a length at least l30% greater than the length of said tube and said wall having a continuous fluig-tight weld seam along its length wherein said inner surface is substantially free from protrusion of said passage, and wherein said tube has a plurality of fins attached to said outer surface thereof.
- 3. A heat exchanger as in claim 2, wherein the said continuous passage between the said surfaces has a serpentine configuration.
Parent Case Info
This is a division of application Ser. No. 343,740, filed Nov. 22, 1973, now U.S. Pat. No. 3,831,246.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
343740 |
Mar 1973 |
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