Jurnal Teknika Akademi Teknologi Warga Surakarta

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Edisi 11, Nomor 6
Judul KARAKTERISTIK PERPINDAHAN PANAS PIPA LURUS DAN PIPA PUNTIR PADA SOLAR KOLEKTOR TIPE PLAT DATAR MENGGUNAKAN SIMULASI CFD
Penulis

1) Thoharudin, 2) Arif Setyo Nugroho, 3) Edy Suryono

1),2),3) Jurusan Teknik Mesin Akademi Teknologi Warga, Surakarta

Email: thoharudin@gmail.com

Abstrak

Heating by using solar energy power can save up to 70% in the domestic scale so the research on solar energy is attractive to develop. One of the utilizations of solar energy is to heat the fluid by using flat plate solar collector. This paper discusses the CFD modeling to compare the type of flat plate solar collector with a straight pipe andtwisted pipe configurations. The results of this study found that the configuration of twisted pipe in flat plate solar collector has a better heat transfer than the straight pipe configuration. However, the twisted pipe has a greater pressure loss than the straight pipe flat plate solar collector configuration.Water mass flow rate also influence in temperature deference. The lower water mass flow rate the grather water temperatur deference.

Keywords: Solar Collector, heat transfer, twisted pipe, CFD.

Paper 11 - 6 PDF
Edisi 11, Nomor 5
Judul KARAKTERISTIK PEMISAHAN KEROSENE - AIRDENGAN VARIASI HAMBATAN DOWNSTREAMKE SIDE ARMT- JUNCTION DENGAN SUDUT 30o PADA SALURAN MIRING
Penulis

1 Karminto, 2 Stef Unjanto, 3 Suhartoyo

1,2,3 JurusanTeknikMesin, AkademiTeknologiWargaSurakarta

Abstrak

Research about T-junction as separator still in developing, especially about liquid-liquid flow to get maximum efficiency. Has been done research about dissociation characteristic of kerosene and water applies T-junction with inlet - 1,5o orientation of side arm upward with angle of 30o. Pipe diameter inlet 36 mm, and side arm pipe diameter 19 mm, from material plexyglass. Variable which in measure is, debit kerosene and secretory water passed side arm and run arm to get its the dissociation efficiency based on speed of superficial kerosene and water according to test matrix. Pressure difference at area T-junction also is measured. To point kerosene flow into side arm hence in doing arrangement of flow resistance at downstream equal to 42%, 57%, and 72%. Based on visualisation and measurement data yields maximum dissociation efficiency equal to 100% happened at its the flow pattern stratified.

Keyword : T-junction, Kerosene-Water, Flow resistance downstream

Paper 11 - 5 PDF
Edisi 11, Nomor 4
Judul APLIKASI METODE TAGUCHI UNTUK MENGIDENTIFIKASI KEKERASAN HASIL PENGELASAN MENGGUNAKAN MESIN LAS TITIK
Penulis

Sarwoko (1), Didik AW (2), Bambang Margono (3)

(2) Jurusan Teknik kimia Tekstil

(1)(3)Jurusan Teknik Mesin Akademi Teknologi Warga Surakarta

Abstrak

The use of stainless steel for home appliances, especially the food processing equipment has been developed. Besides having good corrosion resistance, stainless steel is easy to clean and hygienic. Stainless steel is a metal alloy containing iron compound Fechromium and nickel. Due to economic reasons and more environmentally friendly then developed stainless steel material with a low nickel content. one of which is the connection SUS 316 L and J4.

One of the characteristics of the regions forming the fusion welding process is the intensity of the heat source used to melt metal. The intensity of the heat source generated from a powerful electric current arrangements as a source of energy. In this study investigated the influence of electric welding RSW aru strong against physical-mechanical characteristics of the weld metal was kind of SUS 316L and J4. This study is an experiment in the laboratory, the material used is 316L SS (Cr. 12.5%, Ni 13%) and SS J4 (Cr. 15%, 1% Ni), the RSW welding with strong variations in electric current 8, 5 kA and 6.5 kA.Jarak weld point 20 mm and 10 mm, 3 detik welding time and 2 seconds, automatic welding diameter 3.2 mm and 1.6 mm, as well as mechanical tensile shear and hardness tests.

Optimal condition occurs in strong variations of electric current of 6.5 kA, welding point distance 20 mm, wel- ding time 2 seconds, 3.2 mm diameter automatic welding, pressure style ,2,0 kN produce tensile stress 133 MPa and shear force 300 HV.

Key words: Las electrical resistivity, SUS 316L, J4 and Taguchi method.

Paper 11 - 4 PDF
Edisi 11, Nomor 3
Judul OPTIMALISASI NILAI KEKUATAN TARIK PADA PEMBUATAN KOMPOSIT UPRS - CANTULA 3D DENGAN METODE TAGUCHI
Penulis

Lujeng widodo 1), Totok Wartiono 2), Sarwoko 3)

1), 2) Jurusan Teknik Tekstil, 3) Jurusan Teknik Mesin Akademi Teknologi Warga Surakarta

Abstrak

The needs industry on composite materials made from natural fibers with a quality that meets the standards is expected. Because of the existing raw materials can not meet the needs of material is strong, lightweight, inexpensive and environmentally friendly. The purpose of this studis to determine the number of factors Yarn, Twist yarn, woven type and concentration will affect Resin Tensile Strength. And optimization of the number of factors Yarn, Twist yarn, woven type and concentration of the Tensile Strength Resin and natural composites. There for a designed with the construction of three-dimensional woven fabric and resin Unsaturated Polyester (UPRs). Number Variations of thread , Total Torsion, Structure and Percentage Resin wicker is used as a combination of factor levels. Composite tensile testing refers to the standard ASTM D 3039. The statistical testing performed; Normality, homoginity, Anova, SNR and different test. To simplify ANOVAthe writer used Taguchy methode. The results show that the fabric construction, especially the number of torsion and resin concentration effect on tensile strength while the type and concentration of resin wicker affect tensile strength while the optimal value is achieved for Pull strength 26.61 MPa. At the factor level combination Ne1 0.8, Twist 500, Woven with 16 cards and 30% resin concentration.

Keywords: Composite, Yarn number, The amount of twist, kind of 3D, Woven resin
concentration, Taguchy methode

Paper 11 - 3 PDF
Edisi 11, Nomor 2
Judul RANCANG BANGUNMESIN PERAJANG GENDAR DENGAN METODE SLICER PRESS
Penulis

1) Joko Yunianto Prihatin, 2) Agung Supriyanto, 3) Slamet Pembudi

1,2) Jurusan Teknik Mesin Akademi Teknologi Warga Surakarta

3) Jurusan Teknik Elektro Akademi Teknologi Warga Surakarta

Abstrak

Gendar chopper's engine design is one way to application of appropriate technology, to help artisanskarak that still apply the traditional way. One is the process perajangan. The traditional way this turned out to be a barrier to increasing production capacity so that craftsmen can not always meet demand. With a well-designed machine, the process can be faster perajangan. It is evident from the test results produced a production capacity of 174.4 chopped per minute.Results much faster when compared to the traditional way that produces 50 per minute chopped. With a capacity greater perajangan time gains craftsmen will increase so as to improve the welfare of artisans.

Keywords: Gendar, Slicer, Stubborn, Rajang

Paper 11 - 2 PDF