TUTOR 7

CALCULATOR

TIM ASPEN XVII

Fungsi CALCULATOR

• Menghitung suatu nilai variable tertentu yang ingin diketahui

• Menghitung suatu nilai variable tertentu yang selanjutnya digunakan dalamproses simulasi

Cara

• Buat blok calculator

• Identifikasi variabel-variabel yang akan digunakan dalam menghitung

• Susun formula di fortran atau excel

• Tentukan kapan blok kalkulator dilaksanakan

Contoh Soal

Pembuatan Propilen Glikol di dalam RCSTR

• C3H6O + H2O C3H8O2

Propylene oxide Water Propylene glycol

• Property methods : Wilson

• Kondisi Umpan:

• T = 25O C

• P = 3,5 bar

• C3H6O = 18,762 kmol/hr

• H2O = 250 kmol/hr

• Methanol = 32,73 kmol/hr (ditambahkan agar C3H6O larut dalam air)

• Kondisi Operasi Adiabatik dengan P = 3,5 bar

• T = 25o C

• Volum RCSTR = 1,1357 m3

• Valid phases = Vapor-Liquid

• Reaction Phase = Liquid

• (-ra) = k Cp2

• k = 9,15E+22exp(-155600000/RT)

• E[=] J/kmol

Kemudian : RUN!!!!

Contoh Soal

ResultPRODUK REAKTAN

Temperature C 25 25

Pressure bar 3,5 3,5

Vapor Frac 0 0

Mole Flow kmol/hr 300,257 301,492

Mass Flow kg/hr 6642,258 6642,258

Volume Flow cum/hr 7,149 7,16

Enthalpy Gcal/hr -19,488 -19,485

Mole Flow kmol/hr

PO 17,527 18,762

WATER 248,765 250

PG 1,235 0

M 32,73 32,73

Case 1

Ingin diketahui konversi yang dicapai

• Flowsheeting Option >> Calculator >> New >> C-01

• Define :

IN = mol flow, REAKTAN, PO, import variable

OUT = mol flow, PRODUK, PO,import variable

Case 1

• Import Variables: menentukan arus informasi dari blok atau stream yang sudah tersedia datanya untuk diinput ke calculator blok.

• Export Variables: menentukan arus informasi dari calculator block ke AspenPlus.

Calculator > SequenceIf you choose this option The block is executed

First At the beginning of a simulation

Last At the end of a simulation

Before Immediately before the specified block

After Immediately after the specified block

Report While the report is being generated

Based on order in sequenceAs specified on the Convergence Sequence from

specifications sheet

Use Import/Export variables

Automatically based on Import variables and Export

variables; allows Aspen Plus to place the Calculator

block in the execution sequence

Fortran

Fortran Write Statement

Unit DestinationNTERM Control Panel (if running from the

user interface)NHSTRY Simulation history

Result

Excel

• Open excel spreadsheet

> Add-Ins

> Define masing-masing variabel

> Buat format hitungan konversi

> RUN!!!• Hasilnya langsung dilihat di form excel

RESULT

Case 2

• Bila ratio umpan air : propylene oxide = 8

• Berapa konversi yang dicapai??

• Flowsheeting Option >> Calculator >> New >> C-02

PO = mol flow, feed, PO, import variable

W = mol flow, feed, WATER, export variable

Excel

result

Sekian

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