SolHW11ME2320

# SolHW11ME2320 - V b Q Solution a Assume air is ideal gas 3...

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HOMEWORK 11 4 – 63.Given: Hydrogen, T 1 =200 o C; T 2 =800 o C; Find: u a)Using table A–2c;T b) c vavg ; c) c v at room temperature. Solution: a) = 2 1 T T v dT c u 3 9 2 5 2 10 8704 . 0 10 4003 . 0 10 1916 . 0 11 . 29 T T T c p - - - × - × + × - = h=u+Pv b Pv = RT h=u+RT=u+ ( R u /M ) T b dh=du++ ( R u /M ) dT du=dh – ( R u /M ) dT kmolK kJ R dT R c u dT R c u d dT M R dT M c du u T T u p u p u p / 314 . 8 ) ( ) ( ; 2 1 = - = - = - = kg kJ u kmol kJ u dT T T T u 704 . 6193 ; 5064 . 12486 ) 10 8704 . 0 10 4003 . 0 10 1916 . 0 796 . 20 ( 800 200 3 9 2 5 2 = = × - × + × - = - - - b) kg kJ u T c T c u v Tavg v 4 . 6233 ) 600 )( 389 . 10 ( 500 @ @ = = = = c) kg kJ u T c u Troom v 8 . 6109 ) 600 )( 183 . 10 ( @ = = =

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4 – 65.Given: Air, m = 20 lbm; P 1 = 50 psia; T 1 =80 o F; P 2 = 100 psia; Find: u a)

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Unformatted text preview: V ; b) Q Solution: a) Assume air is ideal gas 3 80 ; ) 50 ( ) 460 80 )( 3704 . )( 20 ( ft V P mRT V = + = = b) Btu Q Q lbm Btu u F T F R P P T T lbm Btu u F T u m U Q E W Q o o o 8 . 1897 ) 04 . 92 93 . 186 )( 20 ( 93 . 186 620 620 1080 100 50 540 04 . 92 80 ; 2 2 2 1 1 2 1 1 =-= = → = = = = = = → = ∆ = ∆ = ∆ =-4 – 66 4 – 79 4 – 83 4 – 84...
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SolHW11ME2320 - V b Q Solution a Assume air is ideal gas 3...

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