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Determination of optimal insulation thickness for valve jackets
Radonjič, Gregor ; Krope, Jurij ; Škerget, Leopold
V prispevku je opisano določevanje optimalne debeline izolacije ventila. Uporabili smo grafično metodo za določitev najmanjših stroškov, t.j. stroški izolacijskega materiala in stroški toplotnih ...izgub. Toplotne izgube skozi izolacijski material smo izračunali z metodo robnih elementov, ki ima določene prednosti pred drugimi metodami, (n. pr. metodo končnih elementov) glede reševanja potencialnih problemov. Ker je celotni problem prenešen v robno območje, iz 3D problema dobimo 2D problem, sistemska matrika postane manj zahtevna, funkcijo aproksimiramo le na robu in natančnost izračunane funkcije in njenih odvodov je istega reda. Predpostavili smo stacionarni tok in konstantne vrednosti za konvekcijo in koeficiente toplotne prevodnosti. Izračunali smo tri različne geometrije: kroglo, valj in sod. Na osnovi dobljenih rezultatov lahko primerjamo optimalne debeline izolacije za vsako obliko ventila in izberemo najboljšo.
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