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Heat losses through polyurethane valve insulation
Radonjič, Gregor ; Krope, Jurij
Ventili so pomembni viri toplotnih izgub, zato je opisana izolacija ventilov. Toplotne izgube smo izračunali za valj, kroglo in sod. Njajlažja je rešitev v primeru votle krogle, izračun za na obeh ...straneh zaprt in kratek valj pa je težavnejši. Uporabili smo metodo robnih elementov, za izolacijski material pa poliuretansko peno. Upoštevali smo periodične sprememebe temperature vroče vode, ki teče skozi ventil in naredili model prenosa toplote. Na osnovi dobljenih rezultatov smo izračunali optimalno debelino izolacije ventila. Uporabili smo grafično metodo. Določili smo vpliv koeficienta konvekcije in temperaturne razlike med vročim fluidom in zrakom na toplotne izgube. Kot rezultat smo dobili najprimernejšo obliko izolacije ventila in pokazali koliko toplotne energije lahko prihranimo s primerno izolacijo ventilov.
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