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Author:Kuitunen, Antti
Title:Epätahtisähkökoneen lämmönsiirtimien optimointi
Optimization of the heat exchangers of an asynchronous electrical machine
Publication type:Master's thesis
Publication year:2004
Pages:89      Language:   fin
Department/School:Konetekniikan osasto
Main subject:Koneensuunnitteluoppi   (Kon-41)
Supervisor:Ekman, Kalevi
Instructor:Ikonen, Janne
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark TKK  6427   | Archive
Keywords:electrical machine
heat exchanger
flow simulation
optimization
sähkökone
lämmönsiirrin
virtaussimulaatio
optimointi
Abstract (eng): The purpose of this thesis was to optimize the heat exchangers used in a certain modular type asynchronous electrical machine.
The most important optimization criterion was the manufacturing cost.
There were eight different heat exchanger structures per shaft height to be optimized.

The optimization of the air-to-air heat exchangers was done by concentrating on one air-to-air and two air-to-water heat exchanger structures.
The thoroughly analyzed and improved features of these structures were then transferred to all the designed structures.
Potential ways of improving the structures were the use of different tube profiles and flow arrangements, minimizing the sizes of the heat exchangers and simplifying the structures.
The function of different kinds of flow geometries was studied with flow simulations.
An analytical sizing method for a counter-flow connected U-type tube-and-shell heat exchanger is also presented.

The most significant way of cutting manufacturing costs proved to be the simplifying of the structures.
Even large cuts in the heights of the heat exchangers lead to only small cost savings.
The calculative costs and also the sizes of all the designed heat exchangers were decreased.
Abstract (fin): Työn tarkoituksena oli optimoida eräässä modulaarisessa epätahtisähkökoneessa käytettävät lämmönsiirtimet.
Tärkein optimointikriteeri oli valmistuskustannus.
Optimoitavia lämmönsiirrinrakenteita oli yhteensä kahdeksan erilaista akselinkorkeuksittain.

Lämmönsiirtimien optimointi suoritettiin keskittymällä ilma-ilmalämmönsiirtimissä yhteen ja ilma-vesilämmönsiirtimessä kahteen lämmönsiirrinrakenteeseen.
Näiden yksityiskohtaisella tasolla tarkkaan analysoitujen ja parannettujen rakenteiden piirteet siirrettiin kaikkiin suunniteltuihin lämmönsiirrinrakenteisiin.
Tutkittavia rakenteiden kehitysmahdollisuuksia olivat erilaiset putkiprofiilit ja virtausjärjestelyt, lämmönsiirtimien kokojen minimointi ja rakenteiden yksinkertaistaminen.
Erilaisten virtausgeometrioiden toimintaa tutkittiin virtaussimulaatioilla.
Ilma-ilmalämmönsiirtimen vastavirta kytketylle U-tyyppiselle putkivaippa lämmönsiirtimelle esitetään myös analyyttinen mitoitusmenetelmä.

Merkittävimmäksi kustannussäästömahdollisuudeksi osoittautui rakenteiden yksinkertaistaminen. lämmönsiirtimien merkittävienkin madaltumisten kustannusvaikutus oli melko pieni. lämmönsiirtimien laskennallisia valmistuskustannuksia ja myös niiden kokoja saatiin pienennettyä kautta linjan.
ED:2004-10-11
INSSI record number: 26389
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