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ANALISIS FAKTOR GESEKAN PADA PIPA LURUS DENGAN VARIASI DEBIT ALIRAN Subagyo, Rachmat
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 2 Februari 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Distribution of laminar or turbulent flow is strongly influenced by the Reynolds number, Viscosity, pressure gradient and surface roughness. High coefficient of friction affect directly to a substantial reduction in pressure and eventually to the energy needed to push the fluid. Because of the role of the coefficient of friction is very important in the flow, so study has been conducted on the straight pipe, and friction factor with the variation of flow rate, by measuring pressure at two particular points to determine the loss. From the experimental results it can be concluded that the friction factor will be smaller in value with increasing Reynolds number and with the increase of Re, the friction factor value will be more stable. In the first experiment the highest friction factor occurs at Re = 4,30 x 104 with a value of f = 2,195 x 10-2 for the second experiment at Re = 1,41 x 104 with a value of f = 2,462 x 10-2 and the third experiment at Re = 2,39 x 104 with a value of f = 2,461 x 10-2. And for the lowest value occurred at Re = 1,91 x 105 with a value of f = 1,513 x 10-2, Re = 1,86 x 105 with a value of f = 1,521 x 10-2 and Re = 1,75 x 105 with a value of f = 1,544 x 10-2. At Re numbers began to 1,50 x 104 - 2 x 104 value of the friction factor tends to be stable (unchanged). The difference calculation from the experimental to the theoretical friction factor is 1,37% and to the moody diagram is = 1,14%.

KAJI EKSPERIMENTAL KARAKTERISTIK ALIRAN EKSTERNAL PADA BENDA TUMPUL SEGIEMPAT DENGAN UJUNG MUKA ELLIPS Subagyo, Rachmat
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Aerodynamic equilibrium at the vehicle can not be separated from the presence of flow separation and drag force that occurs, and is a great loss that can affect the use of waste fuels. Many ways to minimize the drag force that arises when a body drained of fluid flow, one of which is to control the boundary layer on the surface of the object or to modify the shape of the object. In this research using wind tunnel aerofoil as a tool to tes while the test object is made using teak wood in the form of ellipse as much as 5 pieces. The surface of the test object is made smooth and varnished.The results are: AlphaThe smaller the drag coefficient with the increasing Reynolds number and variety of the major axis (a) on the test object, and conversely the smaller the value of the Reynolds number and variety of the major axis is smaller drag coefficient. With different Reynolds numbers show almost the same pressure distribution of the five test specimens except the specimen 75 mm major axis variation of this happens because the influence of the capillary tube. The greater the radius of curvature or the greater variation the separasion nough major axis can be delayed can be seen in the figure based separasi point (b / a) for the fifth test object that the separation point can be delayed due to the fluid flowing in the test specimen experienced less resistance because of its shape more taper than another test.

ANALISIS KARAKTERISTIK POMPA SENTRIFUGAL DENGAN SISTEM SERI DAN PARALEL Subagyo, Rachmat; -, Muchsin; Aulia, Rezky
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The pump is a device for providing mechanical energy to the fluid. At the pump, the fluid density is constant and large. The pump is intended for the transport fluid (horizontal and vertical), raising the pressure and increase speed. The main weakness of the centrifugal pump is located on the limitation of the pressure blower (delivery presure) and not able to provoke their own. For that use multi-level which is usually the same wheelbase and driven by the motor. Various circuits can be used to satisfy a certain condition. Namely series and parallel systems, where a parallel system to increase the pump head and the series system To increase the flow rate.To overcome these problems the research conducted on the characteristics of the pump between the pump with series and parallel systems. To find out the advantages of each characteristic. In this activity, carried out research using the dependent variable valve opening, the load and the volume of water comprising: valve openings Â¼, Â½, Â¾ and 1 and for loading performed at a load 0.25 kg, 0.5 kg, 0.75 kg and 1kg and to use as much water 5 litre, while independent variables are used, namely engine speed of 2980 rpm most of the worth of the smallest worth up to 2945 rpm, the pressure at the pump in and out and the time spent to reach the volume of water by 5 litre. From the test results shows that the comparison between series and parallel pumps each have advantages, further increase in the pump head series and parallel pump further improve the discharge, the pump power and highest efficiency in parallel with 112.79 worth of watts and 65% and the power series highest pump valued at 113.00 watts and the highest efficiency of 53%.

KAJI EKSPERIMENTAL KOEFISIEN KERUGIAN PADA PERCABANGAN PIPA DENGAN SUDUT 450, 600 DAN 900 Muchsin, Muchsin; Subagyo, Rachmat
Jurnal MEKANIKAL Vol 2, No 2 (2011)
Publisher : Jurnal MEKANIKAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.603 KB)

During fluid flow through the system piping installation happened many so-called pressure loss as the major pressure loss and minor pressure loss (loss due to fluid passing through a branching). Distribution of the fluid flow in branching is an irreversible process. This irreversibelitas in the application techniques will reduce the performance of a system. Attemps to find out how big the losses incurred by branching pipe is to measure the coefficient of losses incurred. The form of experiments performed was to make three pieces of pipe brnching angles galvanic type medium with 450, 600 and 900. Re variation of 0 to 5,5 x 104. The results showed that the coefficient Of loss for k3-2 branch (45)= k3-2 (60)= K3-2 (90)= (0,07 to 0,39) and k3-1 branch (45)= (0,95- 0,60), K3-1 (60)= (1,08 to 0,85), K3-1 (90)= (1,10- 1,50), for a total coefficint Ktot (45)= (1,02 to 0,97), Ktot (60)= (1,15 to 1,23), Ktot (90)= (1,17 to 1,89).

ANALISIS FAKTOR GESEKAN PADA PIPA LURUS DENGAN VARIASI DEBIT ALIRAN Subagyo, Rachmat
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 2 Februari 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v3i2.483

Distribution of laminar or turbulent flow is strongly influenced by the Reynolds number, Viscosity, pressure gradient and surface roughness. High coefficient of friction affect directly to a substantial reduction in pressure and eventually to the energy needed to push the fluid. Because of the role of the coefficient of friction is very important in the flow, so study has been conducted on the straight pipe, and friction factor with the variation of flow rate, by measuring pressure at two particular points to determine the loss. From the experimental results it can be concluded that the friction factor will be smaller in value with increasing Reynolds number and with the increase of Re, the friction factor value will be more stable. In the first experiment the highest friction factor occurs at Re = 4,30 x 104 with a value of f = 2,195 x 10-2 for the second experiment at Re = 1,41 x 104 with a value of f = 2,462 x 10-2 and the third experiment at Re = 2,39 x 104 with a value of f = 2,461 x 10-2. And for the lowest value occurred at Re = 1,91 x 105 with a value of f = 1,513 x 10-2, Re = 1,86 x 105 with a value of f = 1,521 x 10-2 and Re = 1,75 x 105 with a value of f = 1,544 x 10-2. At Re numbers began to 1,50 x 104 - 2 x 104 value of the friction factor tends to be stable (unchanged). The difference calculation from the experimental to the theoretical friction factor is 1,37% and to the moody diagram is = 1,14%.

KAJI EKSPERIMENTAL KARAKTERISTIK ALIRAN EKSTERNAL PADA BENDA TUMPUL SEGIEMPAT DENGAN UJUNG MUKA ELLIPS Subagyo, Rachmat
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v4i2.519

Aerodynamic equilibrium at the vehicle can not be separated from the presence of flow separation and drag force that occurs, and is a great loss that can affect the use of waste fuels. Many ways to minimize the drag force that arises when a body drained of fluid flow, one of which is to control the boundary layer on the surface of the object or to modify the shape of the object. In this research using wind tunnel aerofoil as a tool to tes while the test object is made using teak wood in the form of ellipse as much as 5 pieces. The surface of the test object is made smooth and varnished.The results are: AlphaThe smaller the drag coefficient with the increasing Reynolds number and variety of the major axis (a) on the test object, and conversely the smaller the value of the Reynolds number and variety of the major axis is smaller drag coefficient. With different Reynolds numbers show almost the same pressure distribution of the five test specimens except the specimen 75 mm major axis variation of this happens because the influence of the capillary tube. The greater the radius of curvature or the greater variation the separasion nough major axis can be delayed can be seen in the figure based separasi point (b / a) for the fifth test object that the separation point can be delayed due to the fluid flowing in the test specimen experienced less resistance because of its shape more taper than another test.

ANALISIS KARAKTERISTIK POMPA SENTRIFUGAL DENGAN SISTEM SERI DAN PARALEL Subagyo, Rachmat; -, Muchsin; Aulia, Rezky
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v5i2.546

The pump is a device for providing mechanical energy to the fluid. At the pump, the fluid density is constant and large. The pump is intended for the transport fluid (horizontal and vertical), raising the pressure and increase speed. The main weakness of the centrifugal pump is located on the limitation of the pressure blower (delivery presure) and not able to provoke their own. For that use multi-level which is usually the same wheelbase and driven by the motor. Various circuits can be used to satisfy a certain condition. Namely series and parallel systems, where a parallel system to increase the pump head and the series system To increase the flow rate.To overcome these problems the research conducted on the characteristics of the pump between the pump with series and parallel systems. To find out the advantages of each characteristic. In this activity, carried out research using the dependent variable valve opening, the load and the volume of water comprising: valve openings Â¼, Â½, Â¾ and 1 and for loading performed at a load 0.25 kg, 0.5 kg, 0.75 kg and 1kg and to use as much water 5 litre, while independent variables are used, namely engine speed of 2980 rpm most of the worth of the smallest worth up to 2945 rpm, the pressure at the pump in and out and the time spent to reach the volume of water by 5 litre. From the test results shows that the comparison between series and parallel pumps each have advantages, further increase in the pump head series and parallel pump further improve the discharge, the pump power and highest efficiency in parallel with 112.79 worth of watts and 65% and the power series highest pump valued at 113.00 watts and the highest efficiency of 53%.

PEMANFAATAN ENERGI SURYA SEBAGAI SUMBER ENERGI LISTRIK ALTERNATIF PADA MUSHOLA NURUL HIKMAH KELURAHAN LOKTABAT UTARA-BANJARBARU UNTUK MENCAPAI GREEN-ENERGY MOSQUE Cahyono, Gunawan Rudi; Subagyo, Rachmat; Ansyah, Pathur Razi; Ramadhan, M. Nizar; Jauhari, Muhammad Firdaus
Jurnal IMPACT: Implementation and Action Vol. 4 No. 1 (2022): Jurnal Impact
Publisher : Politeknik Negeri Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31961/impact.v4i1.1232

Indonesia mempunyai potensi energi matahari yang cukup besar, karena terletak didaerah tropis. Energi surya adalah energi yang sangat bersahabat karena tidak bersifat polutif, tidak dapat habis dan gratis. Mushola Nurul Hikmah sebagai salah satu pusat peribadatan yang berada di daerah Kelurahan Loktabat Utara Banjarbaru Utara mempunyai motto pengembangan mushola bernuansa hijau baik dari segi tata letak, tata kelola lingkungan, maupun sumber energi yang digunakan. Dari segi tata kelola dan tata letak lingkungan, pihak pengurus Mushola telah menempatkan taman hijau dan perkebunan hidroponik. Dari segi sumber energi listrik, mereka masih menggunakan sumber utama dari PLN dan genset. Kelemahan genset terkait masalah polusi dan suara yang mengganggu kekhusyuan peribadatan. Pihak pengurus mushola beberapa kali mendapatkan keluhan dari Jamaah terkait dengan suara kebisingan tersebut sehingga sangat diperlukan solusi yang lebih efisien baik dari segi daya maupun polusi yang ditimbulkan. Salah satu teknologi energi yang bisa dimanfaatkan dengan minim polusi udara dan suara adalah teknologi panel surya yang bisa mengkonversi langsung intensitas cahaya matahari menjadi sumber energi listrik alternatif. Hal-hal yang perlu diperhatikan dalam perancangan panel surya adalah: besarnya beban total yang akan digunakan, jumlah Modul yang diperlukan, jenis atau karakteristik Modul yang akan dipilih, posisi lintang lokasi dimana system SHS akan dipasang dan besarnya kapasitas AKI yang diperlukan. Apabila akan dilakukan instalsi secara bertahap sesuai perencanaan anggaran, maka kapasitas daya AKI dan Panel surya seterusnya idealnya harus sama dengan yang sebelumnya sudah terpasang, agar tidak terjadi overcharge dan overload. Dengan mengikuti langkah-langkah perencanaan yang telah diuraikan diatas, maka kesesuaian antara kebutuhan, harga, dan kualitas akan dicapai. Kata kunci: energi surya, beban total, Modul, posisi lintang, kapasitas AKI

ANALISIS DIAMETER GELEMBUNG PADA KERUGIAN TEKANAN ALIRAN FLUIDA Rachmat Subagyo; I.N.G. Wardana; Eko Siswanto
ROTOR Vol 9 No 2 (2016)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (509.081 KB)

In the development of science studies have been conducted to observe the losses that occur in piping systems. During the fluid flowing through the pipe friction losses will occur between the fluid with the walls of the pipes, which are called by major losses. In general, the greater the loss of majorlosis on rough surfaces and can be reduced by using a more smooth surface such as glass, acrylic or with other coating materials. Gas bubbles that occur from the reaction of water with very influential magnesium in lowering the pressure in a turbulent flow. With the gas bubbles in the fluid flow creates the effect of two-phase flow. This study reviewed the effect of gas bubbles to the pressure drop (pressure drop) that occurs. The working fluid used is water that flowed through the channel with a square acrylic 18´9 mm size. The bottom of the channel is mounted ribbon mg powder grain size 160mm to create the effect of bubbles in the fluid flow. The powder iron (Fe) used as comparison with the same grain size. The results showed when the turbulent flow mg tape coating is more effective to reduce pressure losses due to flow into two phases and some bubbles that can survive will shrink the size of its diameter so it does not impede the flow rate. Keywords: Piping systems, major losis, bubbles of gas, two-phase flow, bubble effect.

KAJIAN EKSPERIMENTAL DAN SIMULASI CROSS FLOW REVERSAL PADA PROSES FILTRASI MEMBRAN Maruf Maruf; Rachmat Subagyo; Hajar Isworo
ELEMEN : JURNAL TEKNIK MESIN Vol 8 No 2 (2021)
Publisher : POLITALA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/je.v8i2.177

Air bersih adalah permasalahan yang masih terus dihadapi oleh masyarakat di wilayah Kalimantan Selatan terutama bagi mereka yang tinggal di kawasan bergambut. Sumber air bersih yang diandalkan adalah air hujan, yang menjadi sangat terbatas ketersediaannya ketika musim kemarau. Tujuan penelitian ini untuk mengkaji lebih mendalam filtrasi membran secara simulasi dan eksperimental. Metode yang digunakan adalah simulasi dan eksperimental. Hasil penelitian pengaruh koagulan Tawas dan variasi filtrasi menurunkan kekeruhan dan kandungan zat organik. Penambahan jumlah filter yang semakin banyak meningkatkan kejernihan hasil filtrasi pada konsentrasi koagulan yang tetap. Banyaknya aliran yang berbalik arah ketika menyentuh permukaan filtrasi menyebabkan zat organik menyebar atau terdispersi sehingga munculnya gerak brownian yang mengakibatkan zat organik lebih efektif untuk melewati filter. Susunan 5 filter formasi CBACB dengan koagulan 140 mg menghasilkan nilai kekeruhan dan kandungan zat organik yang terendah.

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