prvi i drugi zakon termodinamike (kombinovani ... - MASINAC.org

zbirka zadataka iz termodinamike strana 6!b)jedna~ina stawa idealnog gasa za kiseonik u boci u trenutku uspostavqawatoplotne ravnote`e: q2 ⋅ Wl= nl⋅ Shl⋅ U2!nl⋅ ShL⋅ U22/6: ⋅ 371 ⋅ 397/7q2= =>22/96!NQb!W−421 ⋅21!! odre|ivawe pritiska kiseonika u okolnom vazduhu:!pql= sL⋅ qp>1/132!NQb!!!odre|ivawe radne sposobnosti kiseonika u boci u trenutku uspostavqawatoplotne ravnote`e:! ! Xnby= n ⋅ ( −∆v21+ Up⋅ ∆t2p− qp⋅ ∆w2p)!!!⎡⎛pU q ⎞⎤PL pXnby = nL⋅ ⎢dlw⋅ ( U2− UP) + UP⋅ ⎜dq ⋅mo− Sh⋅mo⎟ + qL⋅ ( w2− wp) ⎥ = 761⎢⎣U2q⎝2 ⎠⎥⎦lK !! !!Shl⋅ U2371 ⋅ 397/7n 4w2= =>!1/1174!! !q722/96 ⋅21lhwS2⋅ U371 ⋅ 3:4n 4 !hl pp = =>!4/7387!!p7ql1/132⋅21lh!! napomena:U delu zadatka pod b) radi lak{e preglednosti veli~ine stawa kiseonika uboci u trenutku uspostavqawa toplotne ravnote`e obele`ene su indeksom!2!!dipl.ing. @eqko Ciganovi}{fmlp@fvofu/zv