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ORC-TEKNIIKAN MAHDOLLISUUDET YDINVOIMALAN LAUHDE-ENERGIAN

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ORC-TEKNIIKAN MAHDOLLISUUDET YDINVOIMALAN LAUHDE-ENERGIAN ( orc-tekniikan-mahdollisuudet-ydinvoimalan-lauhde-energian )

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4.2.1.2 Piste 3. Lauhduttimen jälkeinen tila ennen syöttöpumppua Tämän pisteen arvot saadaan kun tiedetään lauhtumislämpötila T3. Kylmän meriveden lämpö Tkv = 273,15 K 􏰂􏰊 􏰄 􏰂􏰋􏰆 􏰌 ∆􏰂􏰍􏰎􏰏 􏰌 ∆􏰂 (2) 􏰂􏰊 􏰄 273,15K􏰌0,8K􏰌3K 􏰄 276,95K Liitteenä 3 olevasta ammoniakin T,s tasosta näemme paineen lauhtumislämpötilassa, p3 = 4,94bar. Kun paine ja lämpötila on tiedossa saadaan entalpia selville liitteenä 4 olevasta am- moniakin p,h tasosta h3 = 360,78 kJ/kg 4.2.1.3 Piste 2. Turbiinin jälkeinen tila ennen lauhdutinta Ennen varsinaisia tilapisteiden arvoja pitää selvittää todellinen entalpia turbiinin jäl- keen h2. h2 saadaan kaavasta: ηs 􏰄 􏰐􏰃􏰑􏰐􏰒 (3) 􏰐􏰃􏰑􏰐􏰓􏰔 􏰕􏰒 􏰄 􏰕􏰃 􏰇 􏰖􏰗 􏰘 􏰙􏰕􏰃􏰑􏰕􏰒􏰗􏰚 (4) Jossa oletettu turbiinin isentrooppi hyötysuhde ηs = 0,82. Isentrooppisen paisunnan loppuentalpia 􏰕􏰒􏰗 saadaan p,h tasosta kulkemalla pisteestä h1 = 1615,87 kJ/kg käyrän s1 = 5,96 kJ/kgK suuntaisesti lauhtumispaineeseen p3 = p2 = 4,94 bar asti. Liitteestä 5 näemme 􏰕􏰒􏰗 = 1585,64 kJ/kg T2 on sama kuin lauhtumislämpötila. Näillä tiedoin voidaan laskea 􏰕􏰒 21

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