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Unformatted text preview: ME 402: Thermal System Design Washington State University Homework Set 5 Solutions 1) Given: C T K m W U s m V K kg J c C T m kg m A kg J h s kg m Tables From C T in c air nom c p in air c fr fg c sat vap ° ≤ ≤ ⋅ = = ⋅ = ° = = = × = = ° = 38 27 50 2 1007 30 17 . 1 25 . 10 35 . 1 015 . 45 , 2 , , , 3 2 5 , ρ & Assumptions: • Neglect heat loss to surrounding • Constant properties • Heat transfer surface area remains constant 7 . ~ V U V out c T , 12 − R sat c T m , & sat T out c T , in c T , Analysis: a) ( ) s kg m s m m kg VA m fr c c 585 . 25 . 2 17 . 1 2 3 = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = = ρ & K W c m C c p c 589 , min = = & ( ) ( ) W K K W T T C q i c in h 836 , 8 30 45 589 , , min max = − = − = W kg J s kg h m q fg h 025 , 2 10 65 . 1 015 . 5 = ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = = & 229 . 8836 2025 max = = = q q ε ( ) ( ) 2 2 min min 067 . 3 771 . ln 50 589 1 ln m K m W K W U C NTU U C A = ⋅ − = − − = =...
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This homework help was uploaded on 04/09/2008 for the course ME 414 taught by Professor Doe during the Fall '07 term at Washington State University .
 Fall '07
 Doe

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