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old Exam 2 solutions

# old Exam 2 solutions - Please Be neat write out equations...

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Unformatted text preview: Please! Be neat, write out equations before inserting numbers and circle your answers. If you cannot ﬁgure out one part. assume an answer and carry it through the other parts. , It 1. (géo/o) A cylinder/piston arrangement contains 5 kg of water at 1000C with X = 20% and the piston mass is 75 kg. The piston is initially resting on the stops as shown in the ﬁgure. The outside pressure is 100 kPa, and the cylinder area is 24.5 cmz. Heat is m added until the water reaches a saturated vapor state. Find: a) The initial volume b) The ﬁnal pressure ([003) c) The work (1) The heat transfer 6) Show a qualitative P-V diagram for the process. .9 5 a) 2):?“ xqv: ,aa;o43+ ,z/MHQ 3,354}? WW): 56336) = Age”? 7’ , F ”23/ gm rn L) f... : ”QC:— gf/é 7, 31 [ﬁg] 3’ it 84.50%4 "MOM 1 Och. ‘ 2 at)» PzELp:3m%/®m4wk Problem 1 continued m3 7 a) @ 4m) 1%. "({ﬁ .4625”); Vzmyvm §C4685j c ”2343:”: 7% W: P<V1,V‘): 4wkf’e(2.3/S'/é\$ﬂw ESE/<3.— 1.4 ’0 d) or; WWW: 4/5994 + Java/wt 83m 553 ”guy?- 25;}:5 ram“ 22 (ﬂat) : new 0,0/526Mén —Z.”/)[/44‘)/7W" 41M, 7.30 I} 2. (26%) A solar collector panel has a surface area of 32 ﬁg. The panel receives energy from the sun at a rate of 150 BTU/hr per Ft2 of collector surface. Of the incoming solar energy 36% is lost to the surroundings. The remainder is used to heat a stream of high pressure (600 psig water from 110 to 140 ‘F. The pater passes through the solar collector with negligible pressure drop While the incoming Velocity of the water is small, the ﬂow leaves with a rather high velocity 01730 ft/s. a) Determine the steady-state mass ﬂow rate of water in lbw’min. l b) How many gallons of water at 140°F can eight collectors provide in a 30 min. time period? \V: llL'T : u: 11 Li H‘ ; L L3 , 1:2 {44:5 ”' U < F' @144): 77y/fﬂj + 9M4?” :M ((9957 I 59in" ( ¥W L )7: goo/31w: Mu /Zl 32. '2 72%;?! 4.79%? 45¢: 45/ um /079,W my up) * ' V3mY/X‘? “WZOWH’H ; 2,6 ‘ [gm {,0/é24ﬁ)(§)/3Q] :: <7, w M, 10701 7, ’ 5. = f ﬂ/x/(l33ﬂflf @392? / 5’4 3. (WA) In a two- -stcp process air is ﬁrst slowly bled from a tank having a volume of 2. 5 m3. The tank is un— insulated so the process ean be considered iso therm al; the temperature of the air is that of the surrounding. 25 C. lhe air is hled at a rate of 0 1 5 kg/min for 2 hrs at which point the tank pressure is equal to atmospheric pressure (100 kPa). In the second-step, the bleed valve is closed and an air compressor is turned on and ﬁlls the tank to a pressure of 350 kPa The outlet tempeiature hour the con pr: ssor is 300°C and the ﬂow is isothermal The ﬁnal temperature of the air in the tank is 50 C. \ l a) What was the intial mass of air in the tank? b) What was the initial pressure in the tank? ,- a!) What 15 the final mass of air in the ta.nk d) What was the total heat transfer to/fron '1 the tank/([47)? Compressor Bleed valve V a) 51/7 m K 7; 4 Ma Wat/2.5m? rm (3 gay/(2?? Lyn” 2 431% 4 mow: 5315/9 "60/41; 2' Wilhﬁf '23 21V /\$7’% ml : mz+‘mow: 2.43 +/§7:;~“’Z€?.<73/§ 5t) /?=l/ 177,er Problem 3 continued : 7 SC] EVW/Z €31— 35425) W: “E4,” 3 3 H...“ .A, ..._ _,,._.. ,_. ‘5 ’ M W W.“ M, / L» W q, 4 5 I3 '5 j fem‘ ﬁnk [@519 V5 Q/W+m.~n/” m WWW‘P “5% M, m ” ~ 7,‘- \$3M? 33/4/6145)'223,4(2an7a)[email protected]+<7ﬂ5 2,4525 75/ H 1 -3277? =Q+34303 , 5331 Lﬁ/Q ~6¥87 KT 0150/}? (um m,}= Q Wumﬂw 213 M4?) IWZ‘I‘U 0'3. m3“ (’{zml ‘3 g“; “F ”753‘ km 23/431,49— 213,912,43}: 2.62 4 6 32157717) L7) ’25, )2). ? was? m, (was ~é7w ...
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