hw3_sol_printable

hw3_sol_printable - An upcn pot containing one liter of tap...

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Unformatted text preview: An upcn pot containing one liter of tap water is placed on a [EU—Vinns} kitchen stove that draw 2 ‘ M11113) Assuming perfect mixing in the water and no heat losses to 1b: pot or surmmidings, how long before the “mgr {a} just bcg'm to boil and [b] has completely boiled away? fig? Few/er suffz'iedf 4: 7H” waft-ar- F3 P = Iv = (QAD/Jzo u) :- 24-0 Warifi: (a) ‘73 war-{- H‘m‘r Praia-affirm P¢?ur'ihs m4 assumpairba r‘e GPA-ingr'fii’re acne-F r‘nr‘fihi gaunt) +¢m era-Fart; w I‘cJ'q wfh’ as: Lame. 4p 35?. 5 ('72. 37°F), c 774:}: ar-i- can in: comp (Mtge! vim Way: ' (Giusfaj‘ G} '= M CF AT J er : ujr'flj Q ‘= m :5": er'f'iiaw Enid; «Liana W195?! fl‘p wa‘far r} . 3 m:(_’1 iii—5): .1033 = i {:3 4) 7115 (if, 4-2»- WD'f—afi I? ‘f-faé flZj'f'nCJ urn-all, Mia-Far éar‘f: a1"- iconic 62': fiamfiémsé *fijflao‘t-Jz rt) = 32‘}. 4 z: :51 (a) 55-62% Law by) -—- 4&5 (ET/£3 A(22-$"CJ nah? 5a,; 2» 8:51.452) +w(2zs°cX£—oi3—p5¢4 (9.2? M1 :_. é’i’E-Féitmmeq—JTE LDIE— CLO-37RSS'J-rrxfls = $45. 5 '73-; 6Lwowm' a = (1 #73665 4,) = fit k9é!!9.5—?¥.Sé§_) = 3.251%]— U$FHJ 'H‘Jc {lair-firs- Vq’ue : P'flut 3 C31 in = 4:3— = 2'2; 55., '11. yam-i; a“, h;5_(/G'I.Dr3 5.9,): 2256.1 AI/Aj JO‘A :5— r" 62. = m ’75:? A76: 1k 22545.1 1:31: 1mg) (34¢: WM?)- r/s/w kg 2m} 5617 W = 2-6 17-33;? A Murals—sized elem-in system has a generating capacity of4flflfl MW and a peak load of 3 £00 MW. [I is dcsircd to maintain generating capacity at least 200 MW above the peak lmd. If the peak [and has bran growing at 3% per year, when should thl: next generating unit be added to the 5351:2111? Erwi— Jerfi'rj clfléw a 65,-; m-Hg frtfluifix ant“? Spam 0:: W we urtcleri-J-a-rcf 45-9 jg“. flpbt’am elf-“Her- pcqi Iffi'v P we: 3wa _._l_fl__ _,_ f Today Fm"...- Va? firm}:ka We F3031: Hen-J- rmw trier-Q4355 mum'— Be. defch when 4%.: Marty Fed fad-'1‘ .9: m‘ 'Lf'fim (WW-‘20:!) HW= 3230511 MW 7712‘; :‘s afmas'f’ an errand-mics a (‘19 cm man” {:13 ‘1H'1a94' We: flan use 5-94 gum J {15: urea-Frrclvy Ecgqnmr‘c! 45):"? our}. F = P (i + 1%)” 330:) MW: 3100 MW (1+ Boo ‘ 'gTEET : 1.2255 = (1+G‘D3)* = 1‘03 New fikt foam 9? Eafl'a sad” fag“: (1.2.253) = 193,5 [-1.035 0.03342 :11— Ia3,o(£oa) legaaeta -= :t (alomate) ———_._._ [iffirfiofi a) r i- A fossil paw plant has a linernndymmic cficiency 0f33% and its fimlacz yttth heat at the rate of [3x105 BTUu'min. (4:) Wm is. the output pom of the plant in kW? [:1] At what rm dues the plant discharge heat to the environment? (12*:- I,sxros§ff; /Z+h=0-35 Ii (it) Wm = [2% (3% _ = (a, gal/I, ‘8): I05 3! [LIE-fig; @) r4 er‘nnfafe hag-4r [gm—llama! em arodwwfi (arrow!- 540w: [IL-211,6 Prad'f' ‘———‘:’W aw (3:34“ ‘= W + érqjuat Can-3m; = 53945-1 ‘— W = Gian“ f3“ C‘i-H. = (51,“, (i—I’Zfi) = 0.8.: roffiflwfla) = g}: :15:- at? 1 = 1,353 kw Thermoelectrics and thermionics are direct energy conversion methods to turn thermal energy into electricity. Nonetheless, the system efficiency is Carnot cycle limited. In the case of thermoelectrics, n-p semiconductors may be used to accomplish the energy conversion process. Assuming a 20°C heat sink temperature, plot the maxim um theoretical efficiency of these direct energy conversion schemes as a function of heat source temperatures to 250°C. Solution: To.w = 20 °C T.§. ["C1 scam Don't forget to use absolute temperature {‘K). 20 0.0000 30 0.0330 40 0.0539 50 0.0929 50 0.1201 T0 0.1458 50 0.1100 5., 90 0.1923 5 0-35 100 0.2145 '5 110 c.2350 E “'30 120 0.2545 R n 25 130 0.2?30 140 0.2905 g 0.20 “so 0-3073 t- -— 160 0.3233 5 0-15 -— 17'0 0.3335 100 0.3532 0'10 190 0.3572 .105 200 0.3505 21g (13934 0.00 l I . . . I l 220 0.405? 0 50 100 150 200 250 230 0.4175 o 24'] Q4283 Heat Source Temperature [ C) 250 0.43913 1-1!ID‘lehnstc-nfllimmi-mdIWFupudinlu'bincmlpil.Th:mbluehuldilbldc ' Ind. mochmical cfficifllcin of (1.90 and mainly. It driws m chad: mm m has In efficiency of 0.96. Cflculflc flu: output power of the gamma: in r'n-egmnll'm‘amr Fri-r1“. S";de 4-4:; fer éjflgélgfiif h 1"}- ‘37..? Eitufflm s I. 526:4 Efiffém'a—‘é' +i__!___E§._E*__,_._-s calugT'mM k5; :— :IIOS'E TI), “.4 Warmly (Fungus) I: 7?; =‘Wfi‘ " 53.7552 71.:- axH- ean-J'IP/v (reusing-(Hr) II: 3-11., = £1; + 2565-£,3= 69,7¢++(’o_7ssa}fljas.a-é9.7 = 8513.3 :34u/xbr, gar-v? E%Hn+alflr’] 411:9 adfniué-FIL J-urén'ng: em'tufnr‘y {.5- 5 —a fiT = j;l—h3; A; I A, - /?_J, (Inf—5‘1 \u-v :457_2h({:.9a\3.{74sz:— 352:5?) = 9:227 F-M/rigm 77s: weckamcaf EDMJ'FQ‘; Fa Wcr“ (wgrk) L: W’T =x‘?’ n‘q AA =(o.qs>(ro‘£”)(;¥sz F—?::.7 afii W = ’73H {(33 A..- >é+mfixTrmflnf§ = :5 if (acne kw TAP. 5'3]: c'ALr‘rlco-F aU+PU1L FQWRK‘ .a' i /? WT =(Ewé)/xsa.é NW) =~ f‘f-S. 5 MW{ Z____.__%.,_ s | Ll A simpl: ideal “unrated Rankine cycle turbine receive: 125 kgi: of stun: at 3011': and mm at 40°C. Calculate {a} the net cyclc pom-r. in mega-HHS. and {H the card»: cfflclcncy. I | at} ASL-£136.? 3m“;?= 275:-0 law/A3 -r 53 = 5559 9622‘: = 5.7638! grxg'w ‘ For $51er J-urér‘nei 5-; :53 | 2 H S~SC’*¢=°C_W "" swam: ‘ 7.6536 =o-éga 1%? = fi§{%°c)+ 2+ Afilfmfic): réZS+@.ees)6-z+aa) = 1'77‘Fo7 kT/kj I WW5 = £33 a)”; = 2751.0—r779e7 = q7£.3 Ear/A3 7T; pMCJJ-Ld weir-Jr Fn’OL-H'J-b $153.: psodwof'afl For??? {1"- r} I neces'EGr-r 4-D de'ILar-mfne 44am: fire-Lasting; aJ— 141:. fuel-u l sa-l-um‘l-Fon +¢mpc=ra4urea 6‘11: Hue ear-Fanny; fibre: Pm+ g? 40 fl: = 0.07375 Elan P5“: 4:390”: “' EEK? £34m (Ir-f :- 4}; (a 49%): 0.00.8007? rut/£5 ; Wrumlp 2 EU- : ‘1'? (EH—Fr) = (0.9010079 "13,3655? 3 LEI-gm $a%fl 5' “‘5’ i = 9-651: I W434 = m?! {w+m — wpwfitfiflsfifi‘ wag—3.7 g) I (L) (1-9:.- 4-5:: Purim": we»; 41:» cem‘pU'f'a 15¢” fag-41F extra; i en‘H-ml'p}: Lech-15 A1: A} + Wpump “1"- Agé‘fiooc) T “Vqu = l6'7.5'+ BAS if = r712 claéd t 53 - in; = 275l.0“-f7é,3? =257+j :9: z.— wng‘ L. !3_3-7 .2 flcf’d" 7; 443 R 5'74. 2: 0‘ 3 7J4 ...
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This note was uploaded on 02/11/2012 for the course EEE 463 taught by Professor Holbert during the Spring '08 term at ASU.

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hw3_sol_printable - An upcn pot containing one liter of tap...

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