11. Silo Drayer
T = 60 C
-Biji -Ampas
T = 70 C
-Air 22
T = 50 C
-Biji -Ampas
-Air
23 24
Silo drayer
T = 90 C
Panas Masuk : Alur 22 :
Q Biji = 4.175,998 kg x 31,9624 kJkg K x 25 K
= 3.336.872,962
kJ Q Abu
= 43,185 kg x 0,882 kJkg K x 25 K =
952,229 kJ
Q Air = 99,326 kg x 4,1840 kJkg K x 25 K
= 10.389,450
kJ Total Panas masuk = 3.348.214,641 kJ
Panas keluar : Alur 24 :
Q Biji = 4.026,923 kg x 31,9624 kJkg K x 35 K
= 4.504.854,329
kJ Q Abu
= 32,475 kg x 0,882 kJkg K x 35 K =
1.002,503 kJ
Alur 23 :
Q Air = 259,111 kg x 4,1977 kJkg K x 45 K
= 48.968,481
kJ Total panas keluar = 4.554.825,313 kJ
Universitas Sumatera Utara
Panas penguapan air dihitung dengan korelasi Watson :
0,38 11
12 1
2
Tr 1
Tr 1
ΔH ΔH
Tr1 = 3
, 647
273 80
= 0,545
Tr2 = 3
, 647
273 80
= 0,545
H1 = Panas penguapan pada titik didih air = 2676 kJkg Hv12 = 2676 x
38 ,
576 ,
1 545
, 1
= 2748,7257 kJkg Panas penguapan
= m x Hv
= 259,111 x 2748 kJ =
712037,028 kJ
Panas masuk + Panas dibutuhkan = Panas keluar + Panas pengupan 3.348.214,641 + Panas dibutuhkan = 4.554.825,313 + 712.037,028
Panas dibutuhkan = 1.918.647,7 kJ Entalphi steam pada 70,11kPa, T 90
C = 2.283,2 kJkg K Saturated steam Maka Steam yang dibutuhkan :
m = λ
dQ =
kJkg 2.283,2
kJ 7
1.918.647,
= 840,333 kg
Tabel LB.11 Neraca panas pada Silo Drayer
Panas masuk kJ Panas Keluar kJ
Komponen Alur 22
Alur 23 Alur 24
Biji Abu
Air Panas Penguapan
Panas dibutuhkan 3.336.872,962
952,229 10.389,450
- 1.918.647,7
- -
48.968,481 712.037,028
- 4.504.854,329
1.002,503 -
- -
Jumlah 5.266.862,341 761.005,509
4.505.856,313
Total 5.266.862,341 5.266.862,341
Universitas Sumatera Utara
12. Nut Crackers
24 25
T = 60 C
-
Biji -Ampas
Nut Crackers
T = 60 C
-
Biji -Ampas
Panas masuk : Alur 24 :
Q Biji = 4.026,923 kg x 31,9624 kJkg K x 35 K
= 4.504.854,329
kJ Q Abu
= 32,475 kg x 0,882 kJkg K x 35 K =
1.002,503 kJ
Total Panas masuk = 4.505.856,832 kJ
Panas Keluar : Alur 25 :
Q Kernel = 3.209,36 kg x 20,354 kJkg K x 35 K
= 2.286.315,97
kJ Q Cangkang = 850,038 kg x 11,6084 kJkg K x 35 K
= 345.365,339
kJ Total panas keluar
= 2.631.681,309 kJ Panas masuk = Panas keluar + Panas hilang
Panas hilang = 4.505.856,832 – 2.631.681,309 = 1.874.175,523 kJ
Tabel LB.12 Neraca Panas pada Nut Cracker
Panas Masuk kJ Panas keluar kJ
Komposisi Alur 24
Alur 25
Biji Kernel
Abu Cangkang
Panas hilang 4.504.854,329
- 1.002,503
- -
- 2.286.315,97
- 345.365,339
1.874.175,523
Total 4.505.856,832 4.505.856,832
Universitas Sumatera Utara
13. Hidrocyclone