Prepared By Miftakhul Jadid & Triyanto Sugeng Riyadi
Checked By Eka Yudha
Process IKPT
23 March 2010
Objective
 How do Input Xist HTRI?
 How do Analysis of Result?
Content:
About HTRI
B. Xist
C. Input Xist
D. Analysis of Report
A.
A. About HTRI
www.htri.net :
Heat Transfer Research, Inc. (HTRI) is the
global leader in process heat transfer and heat
exchanger technology. Founded in 1962.
Another Software Heat Exchanger Design
 Codeware
 Shell and Tube Exchanger Design
 Etc.
B. Xist
HTRI Xchanger Suite®
is an integrated graphical user environment for the design
and rating of heat exchangers. All components of the
suite—Xace®, Xfh®, Xhpe®, Xist®,Xjpe®, Xphe®, Xspe®, Xtlo®,
and Xvib®—work together.
Xist:
Design, rating, and simulation of single- and two-phase
shell-and-tube heat exchangers, including kettle and
thermosiphon reboilers, falling film evaporators, and
reflux condensers
C. Input Xist
1.
2.
3.
4.
5.
6.
Case Mode (Rating, Simulation & Design)
Input Process
Input Properties
Input Geometry
Design
Control
C.1 Case Mode
 Rating
To Determine Duty & Have sufficient process
Information
 Simulation
Differ with rating only in the amount of process
information
 Design (Short cut and Rigorous Design)
Design new STHE looking for best performance.
C.2 Input Process
Process Condition
 Fluid Name
 Phase
 Flow rate
 Inlet Fraction Vapor
 Outlet Fraction Vapor
 Inlet Temperature
 Outlet Temperature
 Inlet Pressure
 Allowable ΔP
 Fouling Resistantce
 Exchanger Duty
 Duty/flow multiplier
If case boiling/
condensing/ two
phase fill T or
weight fraction.
1.1 for rated flow
(110%)
C.3 Properties
1.



2.



Physical Property Input Option
Mixture Properties via grid
Recommended for non ideal mixture.
Component by component
Recommended for pure substances and ideal
mixtures
Component and Grid properties.
Heat Release Input Method (VLE)
User Specified
Specific dew and bubble point
Program Calculated
Composition Units (Composition basis mole or
mass)
4. Flash Type
 Differential (Vapor-Liquid phase are separate)
 Integral (Vapor-Liquid phase are well mixed)
5. Property Options (Data Interpolation)
 Program / quadratic (quadratic polynomial)
 Linear (for large data)
6. Property Generator
Generate from other simulators (Hysys, PRO II,
etc).
7. Property Worksheet
3.
See next
slide
When Hysys or
other simulators
installed
C.4 Input Geometry
1.
2.
3.
4.
5.
6.
7.
Shell
Reboiler
Tubes
Tubepass Arrangement
Tube Layout
Baffles
Variable Baffle Spacing
C.4 Input Geometry (Continue)
Clearances
9. Nozzles
10. Nozzle Location
11. Distributors
12. Impingement
13. Optional
8.
17-35 %
20%-100% ID,
HTRI: 40 %
1.6 or 2.1
mm
1” / 0.75”
Default
plain
1.25, 1.33, /
1.5
check
Input tube arrangement is
preferable for multi tube
pass
N baffle + 1 (for
E Shell)
For Kettle / Reboiler
(K-Shell) or NTIW
baffle
Refer P&ID / Line
sizing, increase one
stage is acceptable
Input position is
preferable for multi tube
pass / K-Shell
C.5 Design
Design All or Partial design
1. Shell Diameter
2. Baffle spacing
3. Tube passes
4. Tube Length
5. Tube pitch ratio
6. Tube Diameter
7. Shell type
8. Baffle type
Check for
design
Combination
Interval
Total
Combination
Short cut /
Rigorous
Example
 10 minutes for entry data & run case
D. Analysis of Report
1.
2.
3.
4.
5.
6.
Data Check Messages
Runtime Message (warning)
Final Results
Rating Data Sheet
Graphs
Drawings
Yellow is warning
1. Fatal
2. Warning
3. Informative
Give attention &
suggest design
changes
Green is OK
Validity Input
Geometry
1 Shell - 2 Tube pass
Temperature
Cross / Pinch?
Validity Process
Condition
Pressure Drop
Calculation is OK ?
Over Design
< 10%?
Validity Input
Geometry
B should least 60%
in turbulent, 40% in
laminar flow
C & F not exceed
10%, E (ineffective)
not exceed 15%
Check Distribution
of Pressure Drop
PD should be
< 25%
Check Dominant Value, If
fouling resistance very
large please verify source
Check Value
R-V-SQ; for liquid
<3000 kg/ms2, for gas
<20% of accoustic
value
Check Value
Pressure Drop Distribution
a.
If Maximum allowable pressure drop entered
- Vapor and two-phase nozzles size to use 12.5%
allowable pressure drop/nozzle
- Liquid nozzles sized to use 5% allowable pressure
drop/nozzle
b.
If Maximum allowable pressure drop not entered
- Vapor and two-phase nozzles sized to 25% allowable
maximum velocity (20% accoustic velocity)
- Liquid nozzles sized to have 0.5 psi (3.447 kPa)
pressure drop per nozzle.
Flow Velocity





Velocities should be
- High enough to suppress fouling
- Low enough to prevent erosion
Refer TEMA Standards
Check Nozzle Velocities
Localized high velocities can cause
- Vibration Problem
- Maldistribution
- Inaccurate Pressure drop prediction
Segmental baffles: nominal crossflow and window
velocity should be similar
NTIW: window velocity should be two to three times the
crossflow velocity.
Wolverine
Heat Transfer Handbook