| 摘要 |
A heat exchanger for exchanging heat between two different temperature fluids. The heat exchanger includes a sealed housing having first and second pairs of inlets and outlets. A first conduit is disposed within the housing. A second conduit is concentrically disposed within and spaced from the first conduit to define a first flow path between the spaced wall surfaces thereof which is disposed in fluid flow communication with the first inlet and first outlet for flow of a first fluid in a first direction through the housing. A second fluid flow path including first and second serially connected sections is provided for directing a second fluid between the second inlet and the second outlet over the exterior wall surface of the first conduit and through the second conduit in a second direction opposite to the direction of flow of the first fluid. In a preferred embodiment, a sealed chamber is formed interiorly within the housing about the first conduit. A third inlet and a third outlet are formed in the housing and are interconnected in a fluid flow communication by a third conduit preferably disposed exteriorly from the housing. The second and third inlets are disposed in fluid flow communication with the sealed chamber at opposite ends thereof to define the first section of the second flow path for the second fluid through the housing. The third outlet is disposed in fluid flow communication with one end of the second conduit such that the second fluid flowing through the sealed chamber in a second direction opposite to the direction of the fluid flow of the first fluid will be directed through the second conduit in the same second direction opposite the direction of flow of the first fluid. Alternately, a plurality of pairs of concentric first and second conduits are mounted in a spaced apart manner within the interior of the housing.
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