cee11-fall07-mt2-Harley-soln

# cee11-fall07-mt2-Harley-soln - Midterm Exam #2 CE 11 -...

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Unformatted text preview: Midterm Exam #2 CE 11 - Engineered Systems and Sustainability University of California at Berkeley Fall Semester 2007 Q0 Wk 0 as NAME: Instructions: answer the questions that follow directly on these pages in the spaces Page 1 provided. Use the back of the page if you need more room for your answer. If you believe there is insufficient information provided to answer a question completely, state reasonable additional assumptions and proceed from there. The exam is olosed—book/closed-notes. You may use a calculator. Please write your name in the space provided above! Time: 50 minutes. Question: 1 2 3 TOTAL Score: Out of: Page 2 1. COMBUSTION STOICHIOMETRY The combustion stoichiometry for ethanol (CH3CHZOH) is shown below. The assumption of complete combustion is an idealization that will not be used in this problem: products of incomplete combustion (CO and H2) as well as some unreacted oxygen are present in the exhaust. CHSCH20H+3OZ+lZNZaaCO+bCOZ+cH2+dHZO+e(5+sz (a) Determine numerical values for the coefficients a, b, c, fin the above combustion reaction given the following information. Q = all; 2 molar ratio of CO to CO2 in exhaust: 0.20 K = bc/ad : equilibrium constant for C0 + H20 <=> CO2 + 1-12 = 0.10 Qaa-f'z’ 59‘7"?“ f ((2512 52%?) 43:0,?3 :> (1:62.25 2c+M e> 3=C+Cf ’5\ ti on. ‘- 07?!“ a/b 0-6 o ,. C ‘ 1,953 :3 at mum, cc 0"?” [<sz “"‘ C/Ci ‘" c’f‘! : an) .5) c/g=0.02, DWéf/‘A 1+ 3x1 2 at+33+cf+2€ e = [7“ (0.33 +2xl.t;7+ 294)]/2 = OJ‘A/ ll loom : f /L t-vi tray/k Page 3 (b) Calculate the CO emission rate in grams emitted per kg of fuel (ethanol) burned. We] €409 E00 2: 0,?3 K lgﬁﬁw/ x [Mi Mm! Ho/d’ gig; 5%,”); 3" 020! 3’ I (0'2 .( 2'8 ((12va 2:2 33 :2 0103;; “6/ Page 4 2. FLAME TEMPERATURE Below is an idealized stoichiometry for coal combustion, using graphite {(38)} as an approximation for coal: C(s)+02+4N2->C02+4N2 (3) Estimate the ﬂame temperature given the following heats of formation and heat capacities. Assume the air and fuel enter at T0 : 298 K; the exhaust gases leave the flame zone at an unknown temperature T. —- -— —. F; f Page 5 (b) What air emissions of concern may result from coal combustion beyond what is shown in the exhaust for (a) above. Assume real coal rather than graphite is being burned. 5‘0Z Nos (moms; No w MM; swap.) xpM/kmﬁaﬂc (Md. 0544— 14nd; maria/(jg). min/£22,942» Wig/£6120, CW.) _ W WM W/o (Lama/m (0) Describe two practical methods to separatelcapture CO2 at a coal—burning power plant. (lbw/L AU, (MU mg £67 mtg Ccmséxﬁf m1; COl . [wail/CL / GKWLMWCM W) ‘ \E in 5 ‘ DEE iii/5‘30: 'SWL’J‘U’ :9 ix \ i “‘7?” "’ﬂ W MGM/NO 4—mio‘i CO» Page 6 3. WORLD OIL SUPPLY (a) Sketch separate production curves showing crude oil production rates versus time assuming (1) constant F, (ii) exponentially growing P, (iii) symmetric production curve. It is not necessary to Show numerical values. P [ X) 061M WP 01) empower/sh»? (Hr) MWI‘VT'C. >4: Page 7 0:) Estimate oil production in the year 2020, given oil production of 30x109 barrels per year in 2005, using a symmetric production curve with peak production occurring in 2010 and 0’ 2 25 years. (0) Estimate the ultimate amount of crude oil recovered. This includes oil already produced in the past, plus oil that remains in the ground that will be produced in future years. ...
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## This note was uploaded on 07/11/2009 for the course CEE cee taught by Professor Monteiro during the Fall '05 term at Berkeley.

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cee11-fall07-mt2-Harley-soln - Midterm Exam #2 CE 11 -...

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