Corrosion resistant heat exchanger
AssigneeSKF Industrial Trading and Development Company, B.V.
InventorAke K. Persson
Life of this patent
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Abstract
A metallic heat exchanger for heat transfer between a first medium flowing in tubes and a second medium flowing about the tubes and within an outer housing, the device including internal walls which divide the housing into three chambers with outlets and inlets to define a single continuous passage, the tubes extending through the chambers such that counter-flow heat exchange occurs in the first chamber, parallel flow heat exchange in the second chamber, and counter-flow heat exchange in the third chamber.
Claims16
In a heat exchanger for heat transfer between first and second mediums, the heat exchanger including a plurality of generally parallel tubes for flow therethrough of said first medium through said tubes and an outer jacket formed by walls surrounding and defining therein a heat transfer space for said second medium to flow about and in contact with said tubes which extend through said heat transfer space and through the jacket walls, the improvement in combination therewith comprising wall means dividing said heat transfer space into three regions, designated I, II and III, through which said tubes extend, the tubes which extend through region I being the same tubes extending through region III, said wall means comprising a first wall portion extending substantially parallel to said tubes and substantially region II from regions I and III said first wall portion having opposite ends each extending toward but spaced from one of said jacket walls, and a second wall portion extending transversely from said first wall portion to said jacket wall and separating region I from region III, said improvement further comprising fluid inlet and outlet means in each of said regions for establishing a direction of second medium flow through each region and for forming a continuous passage from region I to II to III, said tubes being oriented in said regions such that the direction of first medium flow in the tubes is (a):
- in regions I and III generally opposite the flow direction of the second medium through this region, producing counter-flow heat transfer therebetween, and (b) in region II generally the same as the flow direction of the second medium in this region, producing parallel flow heat transfer therebetween.
In a heat exchanger for heat transfer between first and second mediums, the heat exchanger including a plurality of generally parallel tubes for flow therethrough of said first medium and an outer jacket formed by walls surrounding and defining therein a heat transfer space for said second medium to flow about and in contact with said tubes which extend through said heat transfer spaced through said jacket walls the improvement in combination therewith comprising wall means dividing said heat transfer space into three regions, designated I, II, and III, through which said tubes extend, the tubes which extend through region I being the same tubes extending through region III, said wall means comprising a first wall portion extending substantially parallel to said tubes and substantially separating region II from regions I and III, said first wall having opposite ends, each extending toward but spaced from one of said jacket walls, and a second wall portion extending transversely from said first wall portion to said outer jacket and separating region I from region III, said improvement further comprises fluid inlet and oulet means in each of said regions for establishing a direction of second medium flow through each region and for forming a continuous passage from region III to II to I, said tubes being oriented in said regions such that the direction of first medium flow (a) in the tubes is:
- in regions I and III generally the same as the flow direction of the second medium through this region, producing parallel flow heat transfer therebetween, and (b) in region II generally opposite the flow direction of the second medium in this region, producing counter-flow heat transfer therebetween.
Dependencies are inferred from the claim text.