| 摘要 |
In a heat exchanger with confronting partition walls (50) separating two fluids, extended surface for heat transfer enhancement is provided by extended surface packets (42), each comprising a multiplicity of fins (44), made integral with a common base plate (56) and a common top plate (62); packets (42) being attached to adjacent walls (50) through junction layers (68) formed by a bonding process. The partition walls (50) are typically constituted by the flat walls of oblong cross section tubes (34). In a preferred embodiment, for low temperature applications such as an air-cooled steam condenser for electric power generation plants, tubes (34) are made of steel, extended surface packets (42) are made of aluminum by extrusion, and bonding is by an organic structural adhesive. In another preferred embodiment, for high temperature applications such as heat recovery steam generators of combined cycle power plants, tubes (35) are of a high temperature metal; extended surface packets (43) are of a similar metal and made without a top plate; and attachment of packets (43 ) to tubes (35) is by diffusion bonding. Numerous other applications are identified. Depending on the application, the heat exchanger can be constructed of many materials, which can be similar or dissimilar for walls (50) and extended surface packets (42); bonding can be by brazing, soldering, diffusion bonding, and an organic structural adhesive.
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