1) The document provides calculations to determine the diameter of a shell and number of tubes needed for heat transfer between air and oil streams. 2) Given parameters of the air and oil streams, the heat transfer rate is calculated to be 958,950 J/s. 3) Using the heat transfer rate and properties of the tube, the required total heat transfer surface area is calculated to be 35.25 m^2. 4) Based on the total area and tube dimensions, the diameter of the shell is calculated to be 0.31 m and the required number of tubes is 401.

1. FAKHRI BURHANUDDIN
TEKNIK MESIN
41313120068
PERPINDAHAN PANAS-QUIZ 10
/diketahui :
Aliran air
Tci = 200C = 293K
Tco = 360C=309K
Cpc = 4176,61 J/kg-K
Aliran oli
mh = 4,5 kg/s
Thi = 1600C=433K
Th0=1000C=373K
Cph =2131 J/kg-K
Dimensi Tube
Diameter : 3/4in(OD = 19 mm;0,019m ID = 16 mm;0,016m)
Panjang = 4,8m
Jumlah lintasan
1 pass
α=450
CL = 1
CTP = 0,93
PR = 1,25
dalam keadaan clean
Uc=325 W/m2K
os = 20% = 1,2

2. Ditanya = berapa diameter shell dan jumlah tube yang diperlukan?
Dijawab :
- Balans energi pada aliran di sisi shell
)( hohihphh TTcmQ 
= (4,5kg/s)( 2131 J/kg-K)(433K-373K)
=958950 J/s
- Laju Aliran massa di sisi tube (Qh=Qc)
)( cicopc
c
c
TTc
Q
m


= 958950 J/s
4176,61 J/kg-K ( 309K-293K)
=14,3 kg/s
- Beda temperatur rata-rata logaritmatik
CFmcSTm TFT ,, 










2
1
21
,
ln
T
T
TT
T CFm ....(1)
ciho TTT  1 =373K- 293K=80K
cohi TTT  2 =433K-309K=124K










2
1
21
,
ln
T
T
TT
T CFm = = ,
= 100,46
- Mencari uf dalam keadaan foul
2,1
f
c
c
f
U
U
A
A
OS
)( cicopccc TTcmQ 

3. Uf = Uc/1,2
=(325 W/m2K)/1,2
=271 W/m2K
- Luas permukaan perpindahan panas total



STmf
tot
TU
Q
A
,
=
/
/ ( , )
= 35,25m2
-menentukan diameter shell
5,025,0
637,0 












L
dPRA
CTP
CL
D oo
s
=0,637 (1/0,93)0,5((35,25m2)(1,25)2(0,019m)/4,8m)0,5
=0,637 (1.04)(0,47m)
=0,310m
-menentukan jumlah tube dalam shell












 22
2
785,0
o
s
t
dPR
D
CL
CTP
N
=0,785 ((0,93/1))((0,310m)2/(1,25)2(0,019m)2)
=0,785(0.93)(549,58)
=401buah