Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F28
HEAT EXCHANGE IN GENERAL
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F28F
DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
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1/00
Tubular elements; Assemblies of tubular elements
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F28F1/10
Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
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F28F1/42
the means being both outside and inside the tubular element
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F28F1/424
Means comprising outside portions integral with inside portions
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F28F1/426
the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
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