TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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__________________________________Tehnička postrojenja za provedbu kružnih procesa Prema tome, indicirani stupanj djelovanja jednak je produktu teorijskog stupnja djelovanja i stupnja povrativosti η = η ⋅η . i Stupanj povrativosti iznosi od 0.75 do 0.9, a indicirani stupanj djelovanja kreće se u ovim granicama: Ottovi motori η i = 0.26 − 0. 32 , dizelski motori η i = 0.40 − 0. 50 . Efektivna snaga motora P e je snaga koju motor daje na spojci osovine. Ona je manja od indicirane snage P i za mehaničke gubitke. Mehanički gubici su određeni mehaničkim stupnjem djelovanja η m koji je definiran t i g Pe η m = . P Mehanički stupanj djelovanja Ottovih motora iznosi od 0.82 do 0.92, a dizelskih motora od 0.75 do 0.92. Motori manje snage imaju manji mehanički stupanj djelovanja, a motori veće snage veći. Efektivni stupanj djelovanja η e definira se kao omjer efektivne snage i dovedene topline gorivu pa je η e = Q P e dov. = η t ⋅ η g ⋅ η m = Efektivni stupanj djelovanja Ottovih motora iznosi od 0.20 do 0.32. Četverotaktnim motorima nešto je viši efektivni stupanj djelovanja, a dizelskim se kreće od 0.35 do 0.44 za motore snage veće od 10 kW po cilindru, a od 0.29 do 0. 37 za motore manje snage. η i ⋅ η m . 295
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TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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