TANKJKT
Heat Transfer Calculations for Jacketed Tanks
SCREEN SHOTS Copyright 2015 By chemengsoftware.com Visit http://www.pipesizingsoftware.com/ for further information and ordering
The following page shows the Data Input worksheet. Pop‐up comment boxes and dynamic prompts guide your data entry.
Heat Transfer in Jacketed Vessels Version 3 by Stephen M. Hall, PE Copyright 2015
All cells are locked except user-defined data; unlock sheet from Tools menu (no password required) VIEW-COMMENTS to see some additional explanations. Scroll down and to the right to enter data.
Project Data Prepared by
xx
Date
xx
Customary US
SI
xx
W.O.
xx
Unit
xx
Area
xx
Equip No
xx
then click the "Restore Saved Calculation" button
Enter value to convert:
Calculate
Vessel Data Calc Title or Description
Temperature Conversion
To restore a saved calculation, select it from the drop-down box below, Client
550 °F
=
287.8 °C
270 °C
=
518.0 °F
Jacket Fluid Data
Vessel Fluid Data
Garvin Example from Table 2
Orientation
vertical vol to tangent
Total working volume
liters
1,497
Inside diameter
mm
1,200.0
Tangent-to-tangent
mm
1,200.0
Heads
Fluid name
Name
Water
1,497 Temperature at jacket inlet
°C
95.0
Bulk Temp
°C
22.0
Use properties of water
Properties from data table:
Material of construction Thickness
Thermal Conductivity
W/m-°C
Specific Heat
Joules/kg-°C
0.121
Density
g/cm³
Viscosity
Pa-s
mm
7.000
mm
0.00000
Internal surface roughness
mm
0.00130
Outside surface roughness
mm
0.00130
Prandtl Number
dimensionless
Internal fouling factor
m²-°C/W
0.00020
Vapor Pressure
kPa abs
Outside fouling factor (jacket)
m²-°C/W
0.00020
Lining Thickness
Thermal Conductivity
W/m-°C
Specific Heat
Joules/kg-°C
Density
g/cm³
Viscosity @20C
Pa-s
Conventional
Half-Pipe Coil
Dimple
0.997 0.00099
45.9
at inlet
2.64
at wall
0.30
Note: k, Cp and density assumed constant at all temperatures
at outlet
1.05
Viscosity is adjusted, but better to enter 3 values below and check box
Flow Rate in Side-Wall Jacket
No Jacket
0.607 4,183.9
N/A
Tank is Baffled
Inlet/Outlet Nozzle Size
0.867 0.00320
Latent Heat of Vap
Side-Wall Jacket
1,737.5
Agitator Data
Enter a value for each heat transfer surface. When one parameter is entered (flow,
Impeller Type
velocity, or pressure drop) the other two are calculated. Red value shows user entry. Total Flow
DN
Impeller Diameter
mm
384.0
Sidewall Jacket
336.7 liters/min
3.0 m/s
8.8 kPa
Blade Height
mm
72.0
112.2 liters/min
2.0 m/s
2.3 kPa
Blade Pitch (90 deg = upright)
degrees
0.0
0.0
Number of blades
Number of Zones
2
Bottom Jacket
Portion of side-wall covered by jacket
1
Internal Coil
0.0
Velocity
Aiding flow (upflow during cooling/downflow during heating)
Pressure Drop
Agitator Rotational Speed
Page 1
90 6
rpm
180
g
( p
g
g/
g
g)
Calculated tip speed
meters/min
217.1
Half-Pipe Coil Jacket Data
Quick Results Nominal Pipe Diameter
DN
Heat Transfer Coefficients
Cross section angle (180 or 120 deg) Spacing between Coils
mm
Process Side
HTF Side
Overall U
120.0
From Vessel to Sidewall Jacket
4,496
1,293
543 W/m²-°C
25.0
From Vessel to Bottom Jacket
3,469
904
446 W/m²-°C
From Vessel to Coil Conventional Jacket Data
Fluid Flow
Not Applicable Annular space dimension
mm
Standard
40.0
Baffled
Agit. Nozzles
Number of agitation nozzles per zone Throat diameter for each nozzle
Flow Rate
Velocity
Pressure Drop
Sidewall Jacket (each zone)
168.3 liters/min
3.0 m/s
8.8 kPa
Sidewall Jacket (combined)
336.7 liters/min
3.0 m/s
8.8 kPa
Bottom Jacket (in parallel with sidewall)
112.2 liters/min
2.0 m/s
2.3 kPa
Internal Coil
2
mm
5.000 60.0
Temperature Effects
Inlet
Outlet
Heat Transferred
Sidewall Jacket
95.0
78.6 °C
137,909 W
Bottom Jacket
95.0
81.1 °C
39,106 W
Internal Coil Dimple Jacket Data
Top Head
Not Applicable Annular space dimension
Agitator
mm
-164 W Estimated power
20.0
Number of passes
1
0.4 kW
x percent transferred as heat
mm
100.0
Transverse
mm
100.0
mm
75.0
Triangular
W
Vessel contents will heat at the rate of 1.70°C per minute
Longitudinal
Dimple pitch
147 W
22.0
Center-to-center distance between adjacent dimples
Mean dimple diameter
35%
Vessel Contents
Square
Environmental Conditions
Viscosity for Fluid inside the Vessel
Air temperature
°C
-5.0
Wind speed
m/s
2.0
Viscosity data at three temperatures Temp.
Bottom Head Jacket
Tank insulation
No Jacket
Conventional
Half-Pipe Coil
Dimple
°F
Type
Covering (on insulated surfaces)
Same type as Side-Wall Jacket
Use this data
Visc.
Temp
cP
°K
68
0.578
293
104
0.446
313
140
0.347
333
Viscosity coefficients
#REF!
(if uninsulated, enter "0" thickness) Series Flow 0
Thickness
Sidewall
mm
25.0
Bottom head
mm
25.0
Top head
mm
0.0
Internal Coil
Temperature of interest Predicted viscosity
A
B
C
-16.56
19,462.31
922.21
77 °F 0.54 cP 298.15 °K
Use this section when you have experimental pressure drop data
No Coil
Hairpin
Helical
Baffle or Harp Coil
Input the known conditions Flowrate liter/min Sidewall
78.7 4
Viscosity mPa-s
Density g/cm³
Press Drop Use Experimental kPa Pressure Drop Data
39.6
1
62.4
19.6
22.5
1
62.4
6.5
Sidewall
(one zone) Bottom Head
Bottom Head
2 See the instruction manual for further information about the use of this pressure drop technique
Page 2
0.97
Two pre‐formatted reports are included. The first summarizes the input data, and presents the calculation results. The second includes a timeline, calculated using 60 “time slices” at a user‐defined interval. Because this is a spreadsheet, it’s easy to customize the reports. Add your logo and address. The report formats complement chemengsoftware’s other products such as PIPESIZE, VentManifold, and others.
JACKETED VESSEL HEAT TRANSFER CLIENT xx REV PREPARED BY xx xx 0 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
DATE
Orientation Total working volume Inside diameter Tangent-to-tangent Heads Material of construction Thickness Lining Thickness Internal surface roughness Outside surface roughness Internal fouling factor Outside fouling factor (jacket) Vessel is baffled
APPROVAL
W.O.
xx UNIT AREA xx xx Garvin Example from Table 2
EQUIP. NO xx REQUISITION NO.
SPECIFICATION NO.
PROCURED BY
INSTALLED BY
Vessel Data vertical, cylindrical Contents 1,497 liters Bulk Temperature 1,200 mm Thermal Conductivity 1,200 mm Specific Heat ASME Torispherical Dished Density 316 SS Viscosity @20C 7 mm Glass mm Agitator Type 0.0013 mm 0.0013 mm Impeller Diameter 0.0002 m²-°C/W Speed 0.0002 m²-°C/W
PAGE
Water 22 0.607 4,184 0.997 0.00099
°C W/m-°C Joules/kg-°C g/cm³ Pa-s
Turbine (Rushton) 384 mm 180 rpm
Jacket Fluid Method for determining flow rate in jacket or coil: Fluid Name Syltherm 800 95 °C Target Velocity Temperature at jacket in Value 3 m/s Thermal Conductivity 0.122 W/m-°C Pressure drop in sidewall determines flow in bottom jacket Specific Heat 1,725.8 Joules/kg-°C Syltherm 800 Density 0.874 g/cm³ Dow Chemical Co. Viscosity 0.00350 Pa-s Polydimethyl-siloxane Estimated vessel wall temp. 29.745 °C Prandtl Number 46 dimensionless Approx. max. vapor pressure 2.6396 kPa abs Jacket and Coil Data Sidewall Jacket Type Half-Pipe Coil Pipe size: 3 DN; 120 deg included angle; 25 mm between loops 11 loops divided into 2 zones; 4 m2 total heat transfer area Bottom Jacket Type Half-Pipe Coil Pipe size: 3 DN; 120 deg included angle; 25 mm between loops 1 m2 heat transfer area; piped in parallel with sidewall Internal Coil Type No Coil Environmental: -5°C, 2 m/s; Sidewall, Bottom, Calcium Silicate insulation Calculated Results Heat Transfer Coefficients Process Side Wall From Vessel to Sidewall Jacket 4,496 1,181 From Vessel to Bottom Jacket 3,469 1,182 From Vessel to Coil
HTF Side 1,293 904
Fluid Flow Flow Rate Velocity Sidewall Jacket (each zone) 168.3 liters/min 3.0 Sidewall Jacket (combined) 336.7 liters/min 3.0 Bottom Jacket (in parallel with sidewall) 112.2 liters/min 2.0 Internal Coil Temperature Effects Inlet Outlet Surface Sidewall Jacket 95.0 78.6 °C 13.0 °C Bottom Jacket 95.0 81.1 °C 13.0 °C Internal Coil 95.0 95.0 95.0 95.0 95.0 Top Hea 8.5 °C 0 kW x 35% Agitator Vessel Contents 22.0 °C Vessel contents will heat at the rate of 1.7 degC per minute
Overall U 543 W/m²-°C 446 W/m²-°C
m/s m/s m/s
Pressure Drop 8.8 kPa 8.8 kPa 2.3 kPa
Heat Transferred 137,909 W 39,106 W -164 W 147 W 176,998 W
JACKETED VESSEL HEAT TRANSFER CLIENT xx REV PREPARED BY xx xx 0 1 2
APPROVAL
W.O.
xx UNIT AREA xx xx Garvin Example from Table 2
SPECIFICATION NO.
PROCURED BY
INSTALLED BY
Vessel Data vertical, cylindrical Contents 1,497 liters Bulk Temperature 1,200 mm Thermal Conductivity 1,200 mm Specific Heat ASME Torispherical Dished Density 316 SS Viscosity @20C 7 mm Glass mm Agitator Type 0.0013 mm 0.0013 mm Impeller Diameter 0.0002 m²-°C/W Speed 0.0002 m²-°C/W
Orientation Total working volume Inside diameter Tangent-to-tangent Heads Material of construction Thickness Lining Thickness Internal surface roughness Outside surface roughness Internal fouling factor Outside fouling factor (jacket) Vessel is baffled
PAGE
Water 22 0.607 4,184 0.997 0.00099
°C W/m-°C Joules/kg-°C g/cm³ Pa-s
Turbine (Rushton) 384 mm 180 rpm
Jacket Fluid Fluid Name Syltherm 800 95 °C Temperature at jacket in Thermal Conductivity 0.122 W/m-°C Specific Heat 1,725.8 Joules/kg-°C Pressure drop in sidewall determines flow in bottom jacket Density 0.874 g/cm³ Viscosity 0.00350 Pa-s
Method for determining flow rate in jacket or coil: Target Velocity Value 3 m/s
Estimated vessel wall temp.
29.745 °C
Sidewall Jacket Type
Half-Pipe Coil
Bottom Jacket Type
Half-Pipe Coil
Internal Coil Type
No Coil
Prandtl Number
45.9 dimensionless
Jacket and Coil Data Pipe size: 3 DN; 120 deg included angle; 25 mm between loops 11 loops divided into 2 zones; 4 m2 total heat transfer area Pipe size: 3 DN; 120 deg included angle; 25 mm between loops 1 m2 heat transfer area; piped in parallel with sidewall
Environmental: -5°C, 2 m/s; Sidewall, Bottom, Calcium Silicate insulation Timeline (calculated at 3-minute intervals)
Temperature
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
DATE
EQUIP. NO xx REQUISITION NO.
100 90 80 70 60 50 40 30 20 10 0 0
15
30
45
60
75
90
105
Time (minutes)
120
135
150
165
180
Calculations are performed in open‐source Visual Basic for Applications (VBA) macros. The results are collected into an array that is output to a worksheet. This makes it easy to review the results without any clutter.
Heat Transfer in Jacketed Vessels Version 3
Result Details
HTF Film Coefficient, ho Process Film Coefficient, hi Overall Coefficient, U Heat Transferred, Q HTF Flow Rate HTF Pressure Drop HTF Velocity HTF Temperature In HTF Temperature Out HTF Temperature Average HTF Temperature Wall Process Temperature Process Temperature Wall Wall Coefficient, hw Agitator Power Environmental film coefficient, he Jacket-to-environment Ue Jacket-to-environment Qe Process-to-environment Ue Process-to-environment Qe Surface Temperature
1 Sidewall 1,293 4,496 543 137,909 17,511 8.76 3.0 95.0 78.6 86.8 59.9 22.0 29.7 1,181.3 419.9 9.176 1.80 -749
13.0
2 Bottom 904 3,469 446 39,106 5,837 2.28 2.0 95.0 81.1 88.0 55.7 22.0 30.4 1,181.6 147.0 2.850 1.26 -156
36.0
3 Coil 0.0000 0.0000 0.0000 0 0.0000 0.0000 0.000 0.0 0.0 0.0 0.0 22.0 22.0 0.00000
4 Top Head 7.95 3.96 -164
22.0 8.5 1,511.8 7.948
3.96 -164 8.5
W/m2-C W/m2-C W/m2-C W kg/h kPa m/s C C C C C C W/m2-C W W/m2-C W/m2-C W W/m2-C W C
