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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massaan aiheuttaa sen, että lauhduttimen läpi on puhallettava todella suuria määriä ilmaa. Suuren ilmamäärän siirtämiseen tarvitaan isoja puhaltimia, joiden sähkönkulu- tus nousee huomattavan korkeaksi. Kuvassa 14 on esitetty tehon ja prosessihyötysuhteen käyttäytyminen kun lauhdutti- messa käytetään ilmaa ja lauhduttimen arvot ovat: ∆T ollessa 2,8 K ja asteisuus 1 K. Vuosituotto on 227 MWh/a. 34 80,00 70,00 60,00 50,00 kW 40,00 30,00 20,00 10,00 0,00 8,0 7,0 6,0 5,0 4,0 % 3,0 2,0 1,0 0,0 Saatu nettosähköteho sekä prosessihyötysuhde. Höyrystimessä kiertävän meriveden lämpötila = +4,99°C ‐ +34,99 °C Lauhduttimessa kiertävän ilman lämpötila = ‐15,74 °C ‐ +22,53 °C Kiertoaine: Ammoniakki. Meriveden virtaus höyrystimessä = 100 kg/s 8 808 1608 2408 3208 4008 4808 5608 6408 7208 8008 h/a Nettosähköteho (kW) Prosessihyötysuhde (%) Kuva 14. ∆T on 2,8 K sekä asteisuus 1 K molemmissa lämmönvaihtimissa. Pysy- vyyskäyrässä on esitetty prosessihyötysuhde ja nettosähköteho Lauhduttimessa jäähdytteenä oleva ilma ei korkeimmillaan käy kuin noin puoli astet- ta merivettä korkeammalla, joten ei ole juuri olosuhdetta, jossa ilma olisi lämpötila- tasoiltaan huonompi jäähdyte kuin merivesi. Parhaimmillaan ilman lämpötila voi olla kymmeniä asteita veden lämpötilaa alhaisempi, joka edistää kiertoprosessin höyryn paisuntaa turbiinilla. Edellä kuvatussa prosessissa lauhduttimessa tarvittava jäähdyt- teen virtaus on 419,7 kg/s ja lauhduttimen lämpövirta on korkeimmillaan 1175 kW. Tämä saadaan laskettua kaavalla 17.

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