vapour space
liquidcrystal space
liquidcrystal channel
Gambar LC.1 Bagian Utama Kristalisator
a. Desain vapour space i. Volume Vapour Space
H H
c
H
n
D
D
n
θ
Sudut apex, θ = 30
o
Laju massa air, F = 708,025 kgjam Densitas uap jenuh air,
ρ = 1000 kgm
3
40
o
C; 1 atm Space time
uap air dalam vapour space, t = 0,25 jam Volume uap, V
f
= ρ
t F
= 1000
25 ,
025 ,
708 ×
= 0,177 m
3
Faktor kelonggaran = 20
Volume tangki, Vt = 1,2 x Vf
= 1,2 x 0,177 = 0,212 m
3
ii. Dimensi Vapour Space
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Diameter Silinder : Tinggi Silinder D : H = 1 : 1 Tutup dan alas tangki berbentuk ellipsoidal dengan ellipsoidal dengan rasio axis
major terhadap minor 2 : 1, sehingga tinggi tutup Hc = 16 D Brownell
Young,1959 Volume tutup V
c
ellipsoidal = π
4 D
2
H
h
= π
4 D
2
1 6
D =
π 24
D
3
Vt = Vs + Vc Vt =
π 4
D
3
+ π
24 D
3
Vt = 7
π 24
D
3
Diameter Tangki D = �
24V
t
7 π
3
= �
24 × 0,212 7
π
3
= 0,614 m Tinggi silinder H
= D = 0,614 m
Tinggi tutup ellipsoidal H
c
= 16 x D = 0,102 m
Diameter tutup = D = 0,614 m
Diameter liquidcrystal channel, D
n
= 0,15 D = 0,15
×0,614 = 0,092 m Tinggi conical section, H
n
= ½ D – D
n
tan θ
= ½ ×0,614-0,092×tan30
o
= 0,151 m
b. Desain liquidcrystal space i.
Volume liquidcrystal space
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D D
l
H
H
s
H
s
θ
Sudut elevasi, θ
= 30
o
Laju massa liquidcrystal, F = 4182,491 kgjam Densitas liquidcrystal
= 2005,586 kgm
3
Space time dalam liquidcrystal space, t
= 1 jam Volume liquidcrystal, V
f
= ρ
t F
=
586 ,
2005 1
491 ,
4182 ×
= 2,085 m
3
Faktor kelonggaran = 20
Volume tangki, V
t
= 1 + 0,2 × 2,085 = 2,503 m
3
ii. Dimensi vapour space
Diameter Silinder : Tinggi Silinder D : H = 1 : 1 Tutup dan alas tangki berbentuk ellipsoidal dengan ellipsoidal dengan rasio axis
major terhadap minor 2 : 1, sehingga tinggi tutup Hc = 16 D Brownell
Young,1959 Volume tutup V
c
ellipsoidal = π
4 D
2
H
h
= π
4 D
2
1 6
D =
π 24
D
3
Vt = Vs + Vc
Universitas Sumatera Utara
Vt = π
4 D
3
+ π
24 D
3
Vt = 7
π 24
D
3
Diameter Tangki D = �
24V
t
7 π
3
= �
24 × 2,503 7
π
3
= 1,398 m Tinggi silinder H
= D = 1,398 m = 55,030 in
Tinggi tutup ellipsoidal H
c
= 16 x D = 0,233 m
Diameter tutup = D = 1,398 m
Diameter sambungan, D
l
= 2,5 D
n
= 2,5 ×0,092 = 0,230 m
Tinggi conical section, H
n
= ½ D – D
l
tan90- θ
= ½ ×1,398-0,230×tan60
o
= 1,011 m
iii. Panjang liquidcrystal channel
Panjang liquidcrystal channel, L = 0,7
× H = 0,7
×1,011 = 0,978 m
iv. Tekanan Desain
Tinggi level cairan, Hf =
H H
V V
c t
f
+
=
233 ,
389 ,
1 503
, 2
085 ,
2 +
= 1,359 m Phidrostatik
= ρ x g x Hf = 2005,586 x 9,8 x 1,359
= 26709,448 Pa = 26,709 kPa Po = Tekanan Operasi
= 1 atm = 101,325 kPa Faktor kelonggaran
= 20 Pdesign
= 1+0,2 x Phidrosatik + Po = 1,2 x 26,709 + 101,325
= 153,641 kPa = 21,992 psia
v. Tebal Dinding Silinder
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