Undangan Menulis dan Informasi Penerbitan JTM

21 Jun

From:    “Jurnal Teknik Mesin” <jurnalme@me.its.ac.id>
Date:    Thu, 21 Jun 2007 12:23:42 +0700 (WIT)
Subject: [Teknik Mesin Indonesia] Undangan Menulis dan Informasi Penerbitan JTM


Hal : Undangan Menulis dan Informasi Penerbitan JTM
Lampiran : 2 lembar: Daftar Isi & Abstrak JTM Vol.7 No.2, Syarat Penulis

Kepada Yth.:
Bapak/Ibu Pengajar, Peneliti, dan Praktisi
Bidang Teknik Mesin

Dengan Hormat,

Bersama ini, kami mengundang Bapak/Ibu untuk menerbitkan artikel
penelitiannya pada Jurnal Teknik Mesin. Kami terbuka menerima artikel anda
tanpa tengat waktu. Artikel, baik dalam bentuk file maupun cetak, dapat
dikirimkan melalui pos maupun e-mail, dan memerlukan waktu proses
uji-koreksi- sunting sedikitnya 2 (dua) bulan.

JTM adalah jurnal nasional, terakreditasi B (No.56/DIKTI/ Kep/2005) , dan
terbit 3 kali setahun (Januari, Mei, September). Jurnal ini memuat
berbagai artikel terkini dan berkualitas dari berbagai instansi di
Indonesia. Selain itu, 40% dari 113 pelanggan potensial kami berasal dari
luar ITS.

Jurnal ini disediakan bagi para peneliti yang mumpuni, meski begitu JTM
memiliki mekanisme untuk tetap memberi kesempatan bagi peneliti awal yang
ingin mengembangkan potensi disiminasinya. Artikel akan diproses secara
berjenjang, tertib-dokumentasi, dan transparan, sehingga penulis mudah
mengikuti standar yang ditentukan.

Kami juga menginformasikan telah terbit JTM volume 7 nomor 2, edisi Mei
2007 yang menyajikan lima artikel berkaitan dengan konversi energi dan
keandalan (abstrak online : http://www.me.its.ac.id/Data/jurnal.html).

Dengan penerbitan ini kami mengucapkan terima kasih kepada para pengirim
artikel, penyunting ahli, dan seluruh pelanggan potensial kami. Semoga
artikel-artikel berkualitas ini bermanfaat dan memberikan inspirasi
pengembangan teknologi rekayasa mesin.

21 Juni 2007
Hormat kami,

Dewan Penyunting
Jurnal Teknik Mesin, ITS, Surabaya

diwakili
Dr.Ir. Sutardi, M.Eng

============ ========= ====
JURNAL TEKNIK MESIN
ISSN 1411-9471
Volume 7, Nomor 2, Mei 2007

Simulasi CFD Proses Reduksi Char pada Gasifikasi Kayu
dengan Kadar Air Tinggi
Suyitno
( halaman 61-69 )

Karakterisasi Pembakaran Campuran Biodiesel dan Fossil Diesel
pada Motor Diesel Injeksi Langsung melalui Pendekatan Analisa Heat Release
Bambang Sudarmanta, Djoko Sungkono, M. Rachimoellah, Sugeng Winardi
( halaman 70-79 )

Penghematan Energi pada Mesin Pendingin
dengan Variasi Putaran Kompresor
Sumeru, Tandi Sutandi
( halaman 80-86 )

Rekayasa Perangkat Lunak untuk Estimasi Beban Pendinginan
dalam Gedung Menurut Standar Ashrae
Amrizal
( halaman 87-97 )

A Comparison of Flux Limiters for Use in Finite-Volume Computational
Models for Two-Dimensional Viscous Incompressible Flow
A. Tasri
( halaman 98-106 )

Effect of Biomass Addition on Combustion Characteristics of Bio-briquette
Khairil
( halaman 107-114 )

Menentukan Waktu Optimal Penggantian Komponen Transportasi
dalam Rangka Pemeliharaan Preventif
Abdullah Shahab
( halaman 115-126 )

———— ——— —
Simulasi CFD Proses Reduksi Char pada Gasifikasi Kayu
dengan Kadar Air Tinggi

Suyitno
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Sebelas Maret (UNS)
Jl. Ir. Sutami 36 A. Surakarta, 57126, Indonesia
E-mail: msuyitno@yahoo.com

Diterima 21 Nopember 2006; diterima terkoreksi 18 Januari 2007; disetujui
27 Februari 2007

Abstract
The objective of this research is to investigate the reaction mechanism of
char reduction and to investigate the influence of additional secondary
air on the gasification of wood with high moisture content. Experimental
study was done with 98 wt% wood moisture content and additional secondary
air about 25 % of wood mass. The purpose of numerical study was to study
the possible chemical reaction and to study the influence of additional
secondary air about 25 wt% on the produced gas composition and on the
temperature profile in the reduction reactor. It is found that because of
endothermal reaction, maximum temperature in the reduction reactor was
1000 K and declined along the reactor. It is also found that additional
secondary air as much as 25% of wood mass increased maximum temperature
about 1200 K. Additional secondary air reacted with CO, H2 and Char.
Particularly in the heterogeneous reactions, the production rate of H2
increased 28%, the production rate of CO increased 46.7%, the consumption
rate of H2O increased 6.7% due to additional secondary air. The production
rate of CH4 declined 12.3% and the production rate of CO2 declined 10.4%
due to additional secondary air in the reduction reactor.
Keywords: char reduction, gasification; secondary air, CFD.

———— ——— —
Karakterisasi Pembakaran Campuran Biodiesel dan Fossil Diesel
pada Motor Diesel Injeksi Langsung
melalui Pendekatan Analisa Heat Release

Bambang Sudarmanta, Djoko Sungkono
Jurusan Teknik Mesin, FTI-ITS
Kampus ITS, Sukolilo. Surabaya, 60111
E-mail: sudarmanta@me.its.ac.id

M.Rachimoellah, Sugeng Winardi
Jurusan Teknik Kimia, FTI-ITS
Kampus ITS, Sukolilo. Surabaya, 60111

Diterima 8 Januari 2007; diterima terkoreksi 23 Februari 2007; disetujui 2
Maret 2007

Abstract
In this research, an investigation about combustion characteristics of
biodiesel and fossil diesel fuel mixture in stationary direct injection
diesel engine is conducted. Method to be used in the investigation is heat
release analysis. Heat release analysis is based on data of gas pressure
in the diesel combustion chamber, which will be further analyzed to get
rate of heat release and total of heat release curve. The curve
subsequently will be used to estimate the combustion characteristics, such
as ignition delay period, premixed and diffusion combustion, total heat
release and mechanism of soot formation from the combustion of biodiesel
and fossil diesel fuel mixture. From the research, it is found out that
increasing percentage of biodiesel in biodiesel and fossil diesel fuel
mixture tends to reduce/decrease duration of ignition delay, duration of
premixed combustion, duration of diffusion combustion, total of heat
release and soot emission. At 100% biodiesel, the duration of ignition
will be delayed until 4 deg and the duration of premixed combustion will
be reduced until 2 deg. While the total of heat release is down until 26%
and soot emission is reduced up to 30%. Another combustion characteristic,
which is duration of diffusion combustion, is increased until 3 deg. All
of the comparisons are against fossil diesel (0% biodiesel) combustion
characteristics.
Keywords: biodiesel, fossil diesel, diesel engine, heat release, ignition
delay, premixed combustion, diffusion combustion and soot emission.

———— ——— —
Penghematan Energi pada Mesin Pendingin
dengan Variasi Putaran Kompresor

Sumeru, Tandi Sutandi
Jurusan Teknik Refrigerasi dan Tata Udara
Politeknik Negeri Bandung
Jl. Ciwaruga Bandung
Telp.: (022) 2013789, ext.254, Fax: (022) 2013889
E-mail: sumeroe@yahoo.com

Diterima 9 Januari 2007; diterima terkoreksi 9 Maret 2007; disetujui 11
April 2007

Abstract
Cooling capacity selection of refrigeration machines depends on the full
load. However, the probability of the refrigeration machines to operate at
full load is small. The full load operation needs high power consumption.
One of the methods to reduce power consumption is by varying the
compressor speed through rpm-reduction. In this study, the compressor
speed is varied by changing the electric frequency, from 45 Hz to 25 Hz
and resulting compressor speed from 900 to 500 rpm. The experiment is
carried out at a cold storage with 3 HP capacity compressor and constant
cooling capacity. The highest reduction of power consumption is observed
when the speed is varied from 900 to 800 rpm that is 12.4%. Totally, the
power consumption saving by varying the compressor speed, from 900 to 500
is 18.3%. Besides power saving, reducing compressor speed increases the
coefficient of performance (COP), from 2.53 to 3.67, and decreases the
compression ratio of compressor, from 9.31 to 5.78.
Keywords: compressor speed, energy saving, COP, compression ratio.

Rekayasa Perangkat Lunak untuk Estimasi Beban Pendinginan
dalam Gedung Menurut Standar Ashrae

Amrizal
Jurusan Teknik Mesin, FT, Universitas Lampung
Gedung H, FT Unila, Jl. S.Brojonegoro no.1. Bandar Lampung, 35145
Telp.: (0721)7479221, Fax.: (0721)704947
E-mail:amrizals@yahoo.com; kajur502@unila.ac.id

Diterima 21 Nopember 2006; diterima terkoreksi 1 Februari 2007; disetujui
11 April 2007

Abstract
The objective of this paper is to present a computer program for
estimating the cooling load in a building. The common drawback of
estimating cooling load by hand could be solved using the developed
computer program. The software was developed using Visual Basic version
6.0 and based on ASHRAE standard for calculating the four main components
of cooling load: heat transfer from outside building through wall, sun
load for windows, inside load from equipments and human, and air
infiltration from outside building. The result is presented in a form of
computer program that can be applied in calculating the cooling load in a
building according to the ASHRAE Standard. The program was designed
suitable for tropical climate such as Indonesia and cheaper than its kind
of program such as MeMate HVAC 2005. The program also avoids using the
ASHRAE standard tables repeatedly and made the calculation processes
faster, more accurate and more efficient than calculation by hand.
Keywords: cooling load, ASHRAE standard, visual basic, MeMate HVAC.

———— ——— —
A Comparison of Flux Limiters
for Use in Finite-Volume Computational Models
for Two-Dimensional Viscous Incompressible Flow

A.Tasri
Jurusan Teknik Mesin Universitas Andalas
Jurusan Teknik Mesin Kampus, Unand Limau Manis Padang
Email: adek.tasri@ft.unand.ac.id

Received January 2nd, 2007; correction received April 12th, 2007; approved
April 17th, 2007

Abstract
Finite-volume methods (FVMs) are now the popular choice among
practitioners in scientific computation and engineering. This article
focuses on generalized FVMs that can be implemented on unstructured mesh.
The accuracy of finite volume methods is influenced by the limiter used to
achieve suppresses spurious oscillation. Here, different unstructured flux
limiter based on 1D limiter and popularly used Barth and Jespersen (BJ)
limiter were compared to identify which approximation is the most accurate
to solve viscous incompressible flow problems. The accuracy of the second
order 1D based limiter of Van Leer was found better than BJ limiter. It
was also found that the schemes have error as lower as 1/8 of error of
standard second order BJ limiter. Whilst the third order scheme of SMART
and EULER limiter can reduce error much further below the error of the
second order limiter.
Keywords: monotone, limiter, unstructured mesh, finite volume.

———— ——— —
Effect of Biomass Addition on Combustion Characteristics of Bio-briquette

Khairil
Department of Mechanical Engineering, Syiah Kuala University
Jl. Tgk. Syech Abdul Rauf No. 7, Darussalam-Banda Aceh, Indonesia
Phone: (0651)7428420, Fax: (651)7428420, E-mail: khairil@msn.com

Aryadi Suwono
Thermodynamics Laboratory, IURC – Engineering Sciences
Bandung Institute of Technology, Indonesia

Ichiro Naruse
Department of Ecological Engineering, Toyohashi University of Technology
Toyohashi 441-8580, Japan

Received January 17th, 2007; correction received March 22nd, 2007;
approved April 17th, 2007

Abstract
Combustion characteristics of bio-briquette are studied experimentally in
laboratory-scale using an electrically heated batch furnace. Low rank coal
and agriculture waste (rice straw and husk) are used as fuel to make
bio-briquettes. In the experiment, the mass loss of bio-briquette during
combustion was continuously measured by an electronic balance. The effect
of biomass content on burning profile and burnout time were also
investigated. The experimental result shows that the bio-briquette
combustion undergoes two stages which are a higher combustion rate process
and a lower rate process. The combustion rate increases with the biomass
content adds. It is also found that the burnout time of bio-briquette to
be shortened by decreasing bio-briquette diameter and increasing with the
biomass content.
Keywords: combustion, pyrolysis, biomass content, diameter, bio-briquette.

———— ——— —
Menentukan Waktu Optimal Penggantian Komponen Transportasi
dalam Rangka Pemeliharaan Preventif

Abdullah Shahab
Jurusan Teknik Mesin, FTI-ITS
Kampus ITS, Sukolilo. Surabaya, 60111

Diterima 27 Februari 2007; diterima terkoreksi 7 Mei 2007; disetujui 14
Mei 2007

Abstract
The maintenance system significantly determines the overall performance of
a business enterprise. More than often, the maintenance is conducted
without a scientifically designed plan and an appropriate analysis. The
cost of maintenance is therefore soaring high with the frequent
occurrences of breakdown and unplanned component replacement. This study
is conducted to find out an optimum replacement times for the components
of a transportation system. Failure data of several components is
collected, analyzed, and its distribution is determined. By implementing
an optimization model for a maintenance problem developed earlier, taking
account the replacement and breakdown cost, the optimal replacement times
for the components could be ascertained which accordingly leads both to a
minimum cost of replacement and a cost of breakdown. The determination of
optimum replacement time is then employed for components having a Weibull,
Log-Normal, and Normal failure time distribution. The result of the study
shows that most of the components exhibit a Weibull life distribution,
with some components having either Lognormal or Normal life distribution.
The optimum replacement time and the minimum average cost of the component
vary according to the relevant distribution and cost. The tracing of a
different cost curve which in general is difficult to be depicted, is
illustrated for components having different failure life distribution.
Keywords: transportation components, reliability, preventive maintenance,
optimum replacement time.

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