課程名稱︰質能平衡
課程性質︰必
課程教師︰蔡偉博
開課學院：工
開課系所︰化工
考試日期（年月日）︰100/6/21
考試時限（分鐘）：120
是否需發放獎勵金：yes
（如未明確表示，則不予發放）
試題 :
Pick 5 out of 6 questions. 25 points each.
1. (a) Calculate the bubble point of a liquid mixure of 0.7 mol fr. n-hexane
and 0.3 mole fr. n-pentane at 10 atm.
(b) Calculate the dew point of a vapor mixure of 0.7 mol fr. n-hexane and
0.3 mole fr. n-pentane at 10 atm.
2. (a) Calculate delta H, delta V, delta T changes for 1lb of saturated vapor
of n-butane going from 2 atm to 20 atm (saturated)
(b) Calculate the enthalpy change for 10 lb of butane going from a volume of
2.5 ft^3 @360 F to saturated liquid at 10 atm.
3. Feedwater heaters are used to increase the efficiency of steam power plants.
A particular heater is used to preheat 10kg/s of boiler feed water from
20 degree C to 188 degree C @ 1200 kPa by mixing it with saturated steam
bled from a turbine @ 1200 kPa, 188 degree C. the heater loses heat
@ 50J/ gram exiting mixure. What fraction of the exit stream is steam?
4. Calculate the adiabatic flame tem[eratire of C3H6(g) @ 1atm when burned with
30% excess air, and tje reactamts enter @ 50 degree C.
to be continued...
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人生到處知何似? 應似飛鴻踏雪泥。泥上偶然留指爪,鴻飛那復計東西。
老僧已死成新塔, 壞壁無由見舊題。往日崎嶇君知否？路長人困蹇驢嘶。
--
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作者: lukqwertyuio (縱使相逢應不識) 看板: NTU-Exam
標題: [試題] 99下 蔡偉博 質能平衡 期末
時間: Tue Jun 21 16:48:34 2011
課程名稱︰質能平衡
課程性質︰必
課程教師︰蔡偉博
開課學院：工
開課系所︰化工
考試日期（年月日）︰100/6/21
考試時限（分鐘）：120
是否需發放獎勵金：yes
（如未明確表示，則不予發放）
試題 :
5. The following igure shows a process in which CO is burned with 70% of the
theoretical air in Reactor 1. The combustion gases are used to generate
stream, and also to transfer heat to the reactants in Reactor 2. A portion
of the combustion gases that are used to heat the set of tubes in Reactor 2
are recycled. SO2 is oxidized in Reactor 2. You are asked to calculate the
lb mol of CO burned per hour in Reactor 1.
Figure: 等下傳
6. A dryer produces 200kg/hr of a product containing 10% water from a feed
stream that cintains 1.25g of water per gram of dry material. The air enters
the dryer at 100 degree C dry-bulb and a wet bulb temperature of 38 degree C
;the exit air leaves at 55 degree C dry-bulb and 70% RH, as shown in figure.
Calculate the air and heat supplied to the heater, neglecting any heat lost
by radiation, used in heating the conveyoranf so forth. The specific heat
of the product is 0.18.
dew point | air @ 20 degree C, 52% RH
@38 C |
ˇ
|=========|
|-- | Reactor |<-----
| |=========| |
ˇ ^
| |=========| |
|---| dryer |-----------> exit air: 55 degreeC 70% RH
--->|=========|-------------> product: 200kg/hr, 10% water 43 degree C
feed: 21 degree C, 1.25g water/ g dry material
Bonus question:
4kgs of water at 27 degree C and 200kPa are heated at constant pressure until
the volume of the water becomes 1100 times the original valuve. What is the
final temperature of the water?
各種表格請自備。
--
人生到處知何似? 應似飛鴻踏雪泥。泥上偶然留指爪,鴻飛那復計東西。
老僧已死成新塔, 壞壁無由見舊題。往日崎嶇君知否？路長人困蹇驢嘶。
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.112.218.123