4.HW3.mass.energy.balance.solution

4.HW3.mass.energy.balance.solution - CEE 330, Spring 2011...

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1 CEE 330, Spring 2011 Solution for HW#3 Solution 1 Solution 2 a) b) first order decay 33 3 0 1 0 4000 25 4000 ( ) (20,000 ) (0.25 ) ( ) 11 in out rxn in out out out out out dm mm m dt QC QC VkC g m Cm C day L day day mg C L =− ± −× × × = () 3 2 1 0.20 0.6 distance 50,000 1 52,083 0.6 velocity 86,400 9.6 10 4.7 4.2 kt to days day t t CC e m day t s days m s s m Ce mg C L ⎡⎤ ⎛⎞ ⎢⎥ ⎜⎟ ⎝⎠ ⎣⎦ = == = = = / 3 (0) ( ) 0.9 50 8.7 0.9 4.7 u s d d total down down down QQ C Q C g m m C sL s s mg C L += ×= + × =

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2 Solution 3 a) The downstream chloride concentration equals: Yes, this is above the 20 mg/L standard. b) Solution 4 The 600MW value the output for the power plant: Apply energy balance for this system. The heat input is converted into electricity, wasted heat to stack and to cooling water. In this case, cooling water is NOT returned to the river but evaporate. The wasted heat absorbed by cooling water is enough to cause liquid water to change to vapor. 33 (12 10 ) ( 40 5 ) 21 10 5 mg m mg m mg Ls L s mm L ss ×+ × = + 3 6 ) ( 5 ) 20 36 10 5 36 5 86,400 1,000 1 16 11 01 0 mg m mg m X mg mg L s X LL mg m
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This note was uploaded on 01/31/2012 for the course CEE 330 taught by Professor Nguyen,t during the Spring '08 term at University of Illinois, Urbana Champaign.

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4.HW3.mass.energy.balance.solution - CEE 330, Spring 2011...

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