Quiz 1 Key 2010

# Quiz 1 Key 2010 - FIFE 3210 QUIZ#1 Spring 2913 Name KEY...

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Unformatted text preview: FIFE 3210 QUIZ #1 Spring 2913 Name KEY Emblem Maximnm Scare Scare l 36 2 25 3 10 4 35 Total 10%} 1. A. Match the typical values for the convective heat transfer coefﬁcient with type of convective process. (4 points each ~ 20 points total) a) Free Convection, Liquids 13) Free Convection, Gases c) Convection with Phase Change d) Forced Convection, Liquids 7 e) Forced Convection, Gases Typical Value of h [W’mZ-Q Type of Convective Process 2-25 b 25—250 e 50-1000 a 100-20,000 d 2500-100,000 c l. B. Deﬁne the following terms a. Heat transfer - (4 points) Transfer of thermal energy due to a temperature difference. b. Blackbody (state what it is and its characteristics) (6 points) An ideal surface having the following properties: ° Absorbs all incident radiation a For a given temperature and wavelength, emits the maximum amount of energy ° Emits diffusely 2. On a wind chill day (Too? —20°C), the inner and outer surfﬁﬁggiiis window 10 mm thick are 2033; and 0 °C. The thermal conductivity of glass is .0 W/moK. ' ' r H /A_// 3.. Determine the heat loss through a windowthétie 1311 by 2m on a side. (15 points) “Cf—20"” 71 in 112571: g‘ \i W : 096/ éva/-* 1+x ‘ i921 ac”??? _, !< b"? M J I ’ Z — ﬂy '7 ’“ " a a / ﬂm Cg : =—_—: 45909 W at) Coma b. Determine the convective heat transfer coefﬁcient- (10 points) ’ \ I ____'- ‘f C7 .-——- FM. CZE: ((CUNC; :— ‘éCcrUia’l’ '1’) [£2 I . L 1% 3 A [Era \VU h :— {/2 (h 253} f ; .z’j 3. The steady-state temperature distribution through a plane wall (with thickness L = 10 mm) with constant thermal conductivity of 1 W/m-K is I r T(°C) ——— [20 — (105 £11115] (°C) Where X is distance measured from the left wail. [in .— a "l g 2y I I. F) ii 2" f/VHZ\ 0‘17. 2: D? K J; -—= 0 b. Determine the heat ﬂux conducted through the right wall/(x = 10 mm). (5 points) . ~ 1 . \wj 3 .97 H r. 225mm: _ _ w La L,» .5____i / C " “Zﬁ/é/ 0) ﬂ 7‘__ i3 '1 1},” .441 ’ 4. An overhead, 1.13351181118in industrial steam pipe of 1/7:* mm diameter is routed through a bililding Whosewaiis and air are a: 27°C. Pressurized steam mainiaiﬁs a pipe surface A temperature of 127°C, and the heat transfer coeﬁcient associated with 1321113131 cenve'ction is h = 16 W/mZ'K. The suiface emissivity is a = 1/5 .67. Wine? is ﬂee Faie Bf igeaft Henge-'2' Hess ' - ._ n r M, if f Eye? Being—iii ﬁem ﬁne sie Rinse? (25 peiﬁts) (by/Webb 5 ‘1 :5 “ta—Er}? 8 2 4 437:”y5M/z Noie: The Stefan-3301mm constant is 5.670 x 19' WI’ 331 'K . *ﬁ23.1416 l I (35poi11ts) 3.,____. f , 5: L* g H Fix. \\ I if / ': i ,’ ' \ ff. U \\/ i _ _ \ ‘w 7 “ £2704 :— iii-bit \ an u—l-a WM) 0 S A 3‘3 ‘\ a ' x7?“ ‘ ,L i , r: M g 13%;,“ ' é- F—ir’b- d a, was] ,\ 1- 6557705117: J {'39 Q .3 ﬁ'ﬂ'bi (75"a3 (I e 7 {fag _ T T) s, Mpcng/é’o’ E 31779 (.fs'” 3'63 jaw) < '1 '7“: .M D F i \‘izigz‘ﬂ 6 K’ ] w Hugo v m E? t (j ﬂ 7T _ ‘3 i 4. 4)@Y_L)o I / «M1,; We»sz 7, {gawk} /77 M H, ‘7 7:} E} “In: . ,, 1L 5 L £73584 4. / IK/Lﬁ /C ’— '34} J . u r“— «r—j ; 51%,, C77 ‘ x 3::— + are, :75 my #— / w nix/i : z, u — frag—*- t_——4———4— H . ...
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Quiz 1 Key 2010 - FIFE 3210 QUIZ#1 Spring 2913 Name KEY...

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