TESTrepeatafternoonsolutions

TESTrepeatafternoonsolutions - TEST 1 — repeat Fall 2006...

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Unformatted text preview: TEST 1 — repeat Fall 2006 Afternoon PROBLEM I (30 points) Outcome 2 Ammonia is contained in a closed rigid container with a volume of 2 m“. Initially, the pressure and temperature of the ammonia is 'r' bar and 140 “C, respectively. The temperature drops as a result of heat transfer to the surroundings. Determine a) the temperature at which condensation starts b) the fraction of the total mass that has condensed when the pressure reaches 0.5 bar c) the volume occupied by saturated liquid at the final state ot‘0.5 bar PROBLEM 2 (30 points) Outcome 2 A rigid tank contains 5 lbm of a two-phase, liquid-vapor mixture of water at 260 "F; 3 lbm is saturated vapor and the rest saturated liquid. Heat transfer to the contents of the tank occurs until the temperature is 350 0F. a) Show the process on a T-v diagram b) Detemiine the voltune of liquid originally in the tank c) Determine the final pressure in the tank PROBLEM 3 (20 points) Outcome 2 The pressure in an automobile tire depends on the temperature of the air in the tire. When the air temperature is 25 “C, the pressure gauge reads 210 kPa. If the volume of the tire is 0.025 m3. determine the pressure rise when the air temperature in the tire rises to 50 OC. Also, determine the mass of air that needs to be bled off to restore the pressure to its original value at this last temperature. Assume the atmospheric pressure to be l00 kPa. Iflj XL:[flMyz';W/’ . fay/é,“ 3' 3375—ng ' 2/?5'2-fl700/{133 ‘ ME? = ( / “1%)” :(/ -% iZJ’Mffl/ -.~ 5. mg < a _ L c . C) “9 :WJ :fl/flfféWS iiifl/ M’fi/xr/gr; :— «av/72;: iii/fl” V = V/ (Hf/s 353/ %/fl5flé .— .35. yflj __ ~ 35.35’_ f3 __ 747%" 5 '2i7%'ya— W72 14%; afflfi/flyéy/ F“? v '4 *Q/zfififia _ 5V . @w/flflf/ .. 43 ’27:; ' 'V-fl/Zffi/¢fflg/ WW 2F. W (am/2M mam} way/é” ...
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This note was uploaded on 04/07/2008 for the course EGN 3303 taught by Professor Smith during the Spring '08 term at University of South Florida.

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TESTrepeatafternoonsolutions - TEST 1 — repeat Fall 2006...

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