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US 2009/0266509 A1Published application
Heat Exchanger Element and a Water Heater and Heat Pump Utilizing Same
OwnerPatrick Pussellinventor
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Abstract
A heat exchanger element (30) formed from an inner copper tube (32) and an outer copper tube (34). The entire outer surface of the inner tube (32) is substantially in contact with the entire inner surface of the outer tube (34).
Claims7
A method of forming a heat exchanger element, the method comprising the following steps:
- a. drawing a first and a second copper tube, the first tube having an outer diameter less than the internal diameter of the second tube;
- b. inserting the first tube into the second tube;
- c. passing the tubes through a roll former adapted to crush the second tube onto the first tube, such that the entire outer surface of the first tube is substantially in contact with the entire inner surface of the second tube.
- d. annealing the crushed tubes;
- e. bending the tubes into a desired configuration;
- and
- f. annealing the bent tubes.
4 more elements
Dependencies are inferred from the claim text.