Bai tap mo hinh 1
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Transcript of Bai tap mo hinh 1
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Bi 1: Find the specific volume of n-butane at 393.3 K and 16.6 atm using the RedlichKwong EOS.
Phng trnh Redlich-Kwong EOS cho thnh phn tinh khit:
Sau khi bin i, phng trnh tr thnh:
v cc thng s:
Tra Perry's Chemical Engineers' Handbook cho n-butane, ta tm c cc gi tr:
Tc= 425.12 K, pc= 3.770E+06 Pa= 37.2 atm (1 atm = 101325 Pa)
Gi tr R= 0.08206 Latm/(g mol K)
Bi 2: Khc du thang o bnh cha Cho bi ton c bn cha hnh cu r= 5 m hy lp mt thang o th tch ng vi chiu cao ca mc cht lng trong bnh.
a. L Thuyt tnh ton:
Bi ton y t ra yu cu. Trong thc t sn xut thong thng ngi ta ch c th xc nh chiu cao mc cht lng ri sau tnh xem th tch cht lng lc ny l bao nhiu. Nhng tin li ngi ta s tnh ton v khc ln trn bnh mt thang o th tch tng ng vi chiu cao m th tch cht lng t c thong qua mt php tnh.
Nhim v ta l xc lp mt dy chiu cao tng ng vi mt dy th tch:
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v(m3) 50 100 20 300 400 500
h(m) ? ? ? ? ? ?
Bi 3: Mt vch tng thu nhit t ngun bc x sau truyn nhit t b mt vch ra mi trng khng kh bng hnh thc i lu. Ga s khng mt mt nhit, bit nhit mi trng 300K th nhit vch l bao nhiu. Cc thng s khc t cho.
a.L thuyt
Qa trnh truyn nhit xy ra 3 qu trnh vi iu kin:
-Xem nh khng c tn tht nhit
-Nhit khng truyn qua vch trong m ch i lu khng kh
-Vch ch nhn nhit duy nht t ngun bc x
Cn bng nhit :
Nhit lng m vch thu c:
q1= *F**(TR4-T4)
= 5.67*10^-8 W/(m2K4)h s Stefan-Boltzman
F= 1 m2 din tch truyn nhit.
= 1 hiu sut truyn nhit.
TR : nhit ngun bc x. Cho TR = 1000 K
T : nhit vch. Cn tm.
Vy q1= **(TR4-T4)
T TR
Tmt
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Nhit lng mt i :
q2= h*(T-Tmt)
h: h s cp nhit i lu. Cho h= 800 W/(m2*K)
Tmt: nhit mi trng. Tmt= 300 K
Bi 4:
Lp bng tnh Excel gii phng trnh phi tuyn bng phng php chia i
Bi 5 : Bi ton chng n gin
The vapor pressure of the pure substance
10 = 1
+ 1
20 = 2
+ 2
The constant is characteristic for substance and can find in the handbook
The vapor pressure of the substances in the solution obey Raoults Law
1 = 110 2 = 220
is the mole fraction in the liquid phase
a1, b1 : -3330 17.403
a2, b2 : -3810 17.785
P [mmHg]
Ptotal=760
Number of plates: 6
Mole fraction at first plate: 0.1
Establish the model for this problem
Find the mole fraction at each plate.
Bi 2: Khc du thang o bnh cha