| 摘要 |
PURPOSE:To attempt reduction in a high thermal stress in the upper pipe plates and miniaturizing the whole of a heat exchanger by providing baffle boards which lead the flow of a fluid in zigzag outside a heat transfer tube and making a primary system fluid ascend inside the cylindrical body of a heat exchanger and flow out from a primary system outlet nozzle and a secondary system fluid flow in zigzag outside the heat transfer tube and flow out from a secondary system outlet nozzle. CONSTITUTION:Primary system Na flows into I HV through a primary inlet nozzle 1 and ascends through the inside of a cylindrical body 14 and flows out into an upper plenum 11 from an inlet window 12a provided to a pipe plate support 12, and flows into a heat transfer tube 6 from an upper pipe plate 9 and goes down through the inside of a pipe bundle section and then flows out to a lower plenum 10 from a lower pipe plate 8, and, further, flows out to the side of the piping via a primary system outlet nozzle 2. Secondary system Na flows from a secondary system inlet nozzle 3 into I HX and enters the pipe bundle section from its inlet window at the lower section of the pipe bundle. At the pipe bundle section Na ascends as a zigzag flow by baffle boards 13 through the outside of the pipe, and after it leaves the pipe bundle section, it flow out to the side of the piping via the secondary system outlet nozzle 4. Accordingly the heat transfer area can be smaller than that for heat exchangers of parallel flow and it is possible to miniaturize heat exchanger.
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