Heat exchange – With leakage collector
Patent
1984-02-10
1985-10-15
Richter, Sheldon J.
Heat exchange
With leakage collector
126446, 165141, 165179, 165184, F28F 1100
Patent
active
045468192
ABSTRACT:
A double wall heat exchanger for use in solar heaters and the like. An outer drawn copper tube of predetermined thickness and inside diameter is slid over a second drawn copper tube also of a predetermined thickness and outside diameter. A small axial groove, which is parallel to the longitudinal axis of the second or inner tube, is located in the surface of the inner tube and extends the entire length of the inner tube. The tubes are then placed in a furnace and annealed for a specified time and temperature. The double wall tubes are placed in a finning machine. Under a specified pressure and at a specified feed rate, integral fins are formed on the outside tube. While the fins are being formed on the outside tube, internal pressure is being applied forcing the inner tube to expand and conform to the inside diameter of the outer tube. The mating surfaces form a helical passageway which serves as part of the path of leakage. The axial groove communicates with each winding of the helical passageway and substantially shortens the total leakage path, thereby reducing the pressure differential needed to produce evidence of leakage in a given time period. The double wall heat exchanger has good surface between the tubes, has a path of leakage between the tubes at a pressure differential of as low as 3 psig, and has good heat transfer. The axial groove is small enough so as to have little effect on the overall heat transfer rate, but is of sufficient size so as to provide a leak rate that meets the requirements of the installation.
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English Translation of German O.S. 2016991.
Reed Manual, 54 pp., Describing Reed Cylindrical Die Thread Roll Machines.
Amtrol Inc.
Richter Sheldon J.
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