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All Journal Jurnal Energi Dan Manufaktur ROTOR: JURNAL ILMIAH TEKNIK MESIN JTERA (Jurnal Teknologi Rekayasa) SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Multitek Indonesia : Jurnal Ilmiah Jurnal Elemen J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Jurnal Abdi Insani Jurnal Ilmiah Teknik Mesin Poros
Digdo Listyadi, Digdo
Jurusan Teknik Mesin Fakultas Teknik Universitas Jember Jl. Kalimantan 37 Jember 68121
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ANALISA VARIASI JUMLAH LILITAN PADA ALAT PENGHEMAT BAHAN BAKAR TERHADAP EMISI GAS BUANG MOTOR BENSIN 4 LANGKAH PEP, Pratama; Listyadi, Digdo
ROTOR Vol 7, No 1 (2014)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (197.584 KB)

Abstract

Process combustion of fuel in room burn to be influenced by many factor , among others is temperature, closeness of mixture, composition, and turbulensi exist in mixture. When fuel temperature with air mount, hence will progressively easy  to  fuel with  the air  to on  fire.Gas emission  throw away which  is yielded  from combustion  process  at motor  vehicle  can  have  the  character  of  poison  and make  negative  effect  at environment around, the mentioned in causing by less perfect combustion process, gas result of less the combustion perfect for example is CO, HC.The purpose of this study was to determine the effect of the use of electromagnets  in  the  fuel  line gasolin engine 4 step with variations  in  the number of windings on exhaust emissions and  fuel consumption  . The study was conducted  in Laboratory Convert Energi Majors Technical Engineering Faculty Of Technique University Jember . Equipments which  is used  in  the  testing  is Motor gasoline 4 Step with machine brand Honda Supra x  125D, Gas Analyzer , buret, measure glass,  stop wach, tachometer , and accumulator 12 volt. used by materials is Premium RON 88, strand of metal  have diameter to 0,6 cm, pipe  have diameter to 1" with length 12 cm, and ring 18 cm.This study focuses on the variation of the number of windings on fuel saving devices on exhaust emissions of petrol 4 step. Analysis of the data sought includes AFR, Magnetic Field, Ampere each variation, emissions of CO gas (%), CO2 emissions (%), HC emissions (ppm), O  gas emissions (%). Fuel Consumption (FC). From the research  2conducted,  it can be concluded  that  the  larger  the number of winding electromagnets,  the more binding  the amount of oxygen in the combustion chamber , so it would be more optimal combustion. The lower the value of the FC (Fuel Consumtion), the lower the fuel consumption required for the performance of the engine. Variations in the amount of electromagnetic windings affect fuel consumption  . Fuel consumption is  the most efficient use of  the variation  found  in  the number of windings of  the coil 1000  fuel standard state conditions of 0.57 Kg / hr to 0.43 Kg / h at 3000 RPM rotation with increased efficiency of about 8.14% . Although these results are smaller than the results of previous research by 20.35 % , but at engine speed 9000 RPM FC  results of  this  study  resulted  in a  lower ,  ie 0.81 Kg  / hour compared  to 1.19 Kg  / hour.   Keywords : Magnetic Field, Emission Gas  throw away  , Fuel Consumtion.
ANALISIS PENGARUH VARIASI MASSA LPG SEBAGAI REFRIGERAN TERHADAP PRESTASI KERJA DARI LEMARI ES Perkasa, Alfons Erick; Ilminnafik, Nasrul; Listyadi, Digdo
ROTOR Vol 6, No 1 (2013)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1715.606 KB)

Abstract

Refrigerant is a fluid acting on a cooling machine that plays an important role in a carnot cycle cooling engine. In study was done by looking at the effect of adding refrigerant mass variation of the COP (Coefficient of Performance) by using a refrigerant-based non-Freon refrigerant that use LPG (Petrileum Liquefied Gas). In this study using the LPG mass variations 50 grams, 80 grams and 90 grams and use R-12 refrigerant. From the research conducted, the results obtained from the performance engine cooling using refrigerant 80 grams times higher than that using the mass 50 grams and 90 grams, the highest coefficient of performance that is equal to 6,30 The result of research conducted, the result that the COP of the vapor compression machine (fridge) with a variation of the mass is the mass composition 80 grams is best used to obtain the greatest COP. Keyword : carnot’s siklus, COP (Coefficient of Performance), LPG(Liquefied Petrileum Gas)
PENGARUH VARIASI BEBAN PENDINGIN TERHADAP PRESTASI KERJA MESIN PENDINGIN DENGAN REFRIGERAN R12 DAN LPG Rizal A. Y., Moch.; Ilminnafik, Nasrul; Listyadi, Digdo
ROTOR Vol 6, No 1 (2013)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.688 KB)

Abstract

In this research discusses the influence of the cooling load variations on job performance refrigeration includes refrigeration capacity, coefficient of performance and cooling time, the compressor, the impact of refrigeration and compression work with refrigerants R12 and LPG. This study uses a variation of the load is light 20watt, 40Watt, 60Watt, and 80watt at the time of the study for 30 minutes for each of the cooling load, the file retrieval is done use the cooling machine refrigerator sanyo type with dimensions of 90 cm x 45 cm x 45 cm. The results showed the optimum value of COP (coeficient of Performance) of the fridge that I use on the refrigerant R12 and LPG with a load of 40 watts and 30 minutes was 4.75 for R12 and 5.00 for LPG,Obtained that use LPG refrigerant temperature produced less than R12 at the same time that is 30 minutes, the temperature on LPG without cooling load is 10 oC, the load is 11 oC 20 watt, 40 watt load by 12 oC, 60 watt load of 15 oC, and for a load of 80 watts by 17 oC and R12 produced no load temperature is 12 oC, 20 watt load as big as 13 oC, 40 oC as a 15 watt, 60 watt load of 16 oC, and for a load of 80 watts of 18  oC it is seen that the use of LPG refrigerants better because it has a pretty good engine performance compared to R12 views of COP obtained from the same load. Key word: Cooling load ,COP, LPG, refrigerant
PENAMBAHAN DAN VARIASI DIMENSI SIRIP ALUMINIUM PADA TUBE TERHADAP LAJU DAN EFEKTIVITAS PERPINDAHAN PANAS DALAM HEAT EXCHANGER TIPE SHELL AND TUBE T., Rohman; Sutjahjono, Hary; Listyadi, Digdo
ROTOR Vol 6, No 2 (2013)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (154.35 KB)

Abstract

Heat exchanger is a device that serves to change temperature and the phase of fluid. By utilizing heat transfer between two fluids with different temperature from the higher temperature fluid to a lower temperature fluid. This study aims to determine the effect of the addition aluminum fins and dimensional variations on the effectiveness shell and tube heat exchanger. Heat Exchanger was tested by varying the dimensions of the aluminum fins on the tube from the tube without fins, fin tube with a length of 10 mm, 20 mm, and 30 mm. Tests carried out in counter flow so that the heat transfer rate will be better than the directional flow. Of the test will come out hot fluid temperature and cold fluid temperature out. The results showed decreases in the rate of heat transfer fins greater dimension and the dimension of the highest effectiveness without fins. The highest effectiveness is 25.85% in tube without fins. It can be concluded that the addition of fin in this research will reduce the effectiveness of the heat exchanger shell and tube type. Keywords: Aluminum, effectiveness, fin dimension, heat exchanger
KARAKTERISTIK ALIRAN FLUIDA PADA LENGKUNGAN S (DUA ELBOW 90°) DENGAN VARIASI JARAK ANTARA ELBOWDAN ARAH KELUARAN Chairil Ghozali, Digdo Listyadi
J-Proteksion Vol 1, No 1 (2016): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v1i1.192

Abstract

Lengkungan S adalah lengkungan berbentuk S pada pipa yang digunakan untuk meningkatkan fleksibilitas yang terjadi akibat adanya pemanasan dan pendinginan pada sistem perpipaan. Lengkungan S sendiri dapat menimbulkan head lossesyang menyebabkan terjadinya penurunan tekanan (pressure drop) pada sistem perpipaan. Penelitian ini menggunakan fluida udara yang dialirkan ke dalam pipa berbentuk S dengan menempatkan titik pengukuran sebelum elbow90°, di antara elbow90°, dan sesudah elbow90°. Penelitian dilakukan dengan memvariasikan panjang jarak antara elbow90° 3D, 5D dan 7D dan variasi arah keluaran sudut 0°, 45°, dan 90°. Kecepatan rata-rata fluida keluaran tertinggi terjadi pada variasi 5D arah keluaran 45° sebesar 16,67 m/s pada titik pengukuran III, sedangkan tekanan rata-rata terendah terjadi pada variasi 3D arah keluaran 45° sebesar 79,21 N/m2 pada titik pengukuran III. Head lossestotal yang paling rendah terjadi pada variasi 3D dan arah keluaran sudut 0° sebesar 14,40 m sedangkan untuk head lossestotal yang paling tinggi terjadi pada variasi 7D dan arah keluaran 90° sebesar 16,09 m.Kata kunci: Elbow90°, head losses, lengkungan S, dan penurunan tekanan.
Karakteristik Biodiesel dari Minyak Biji Randu (Ceiba Pentandra) dengan Proses Transesterifikasi Menggunkan Katalis NaoH Nofal Kharis; Hary Sutjahjono; Hari Arbiantara; Digdo Listyadi Setyawan; Nasrul Ilminnafik
Jurnal Energi Dan Manufaktur Vol 12 No 1 (2019)
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (109.499 KB) | DOI: 10.24843/JEM.2019.v12.i01.p07

Abstract

Indonesia sangat berpotensi untuk produksi bahan bakar biodiesel yang berbahan nabati dengan keunggulan yaitu bisa diperbaharui. Banyak sumber bahan bakar alternatif yang mudah ditemukan di Indonesia untuk dijadikan bahan pembuatan biodiesel salah satunya biji randu. Pembuatan biodiesel dari bahan minyak biji randu yang diperoleh dengan cara biji randu dikeringkan terlebih dahulu kemudian biji dihancurkan dan haluskan menggunakan mesin penggiling, kemudian setelah biji halus hasil dari penggilingan dipress untuk mendapatkan minyaknya. Ektraksi biji kapuk menghasilkan 16-25 % ml minyak biji randu dari berat biji. Proses degumming dengan cara minyak ditimbang kemudian dipanaskan dengan suhu mencapai ±50 °C, Kemudian di tambahkan asam phospat sebanyak 0,1% dari berat minyak randu. Dengan suhu minyak dipertahankan selama 60 menit. Kemudian proses transesterifikasi dilakukan pencampuran larutan pada suhu 50 °C dengan lama pengadukan 90 menit, proses transesterifikasi menggunakan larutan metanol dan NaoH sebebagai katalis untuk menghasilkan metyl ester. Kemudian biodiesel diuji karakteristiknya dari pengujian menghasilkan nilai kalor 8641,473 kal/gram, densitas 8730 g/cm³, viskositas 6.815 cst, flash point 115 °C. Indonesia has the potential for the production of biodiesel fuels made from vegetables with many advantages, which can be renewed. There are many alternative fuel sources that are easily found in Indonesia to make biodiesel as one of the ingredients for seedling. The making of biodiesel from the ingredients of linseed oil obtained by means of litter seeds is dried first then the seeds are crushed and puree using a grinding machine, then after the fine seeds from the mill are pressed to get the oil. Extraction of kapok seeds produces 16-25% ml of seed oil from seed weight. The Degumming process by weighing the oil is then heated with temperatures reaching ± 50 ° C, then phosphate acid is added as much as 0.1% of the weight of the oil. With the oil temperature maintained for 60 minutes. Then the transesterification process was carried out by mixing the solution at 50 ° C with a stirring time of 90 minutes, the transesterification process using methanol and NaoH as a catalyst to produce metyl ester. Then the characteristics of the biodiesel tested from the test produced a heating value of 8641,473 cal / gram, density 8730 g / cm30, viscosity 6,815 cst, flash point 115 ° C.
ANALISIS UNJUK KERJA COOLING TOWER INDUCED DRAFT COUNTER FLOW DENGAN BAHAN PENGISI ASBES Fachriza Putra Pratama; Digdo Listyadi Setyawan; Mochamad Edoward Ramadhan
ROTOR Vol 14 No 1 (2021)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1259.439 KB) | DOI: 10.19184/rotor.v14i1.24224

Abstract

Industrial development is one of the economic components that influences national economic growth. Increased industrial growth is also aimed at realizing national goals for the welfare of society. In the industrial process, the machine generates heat as a side effect of the machine's work, so it requires a cooling system for its continued work. The facilities used by the industry to overcome these problems are by using cooling towers. One of the factors that influence the cooling tower performance is the filler. Asbestos is a material that has a thin and corrugated sheet shape. This material is made of the mineral silica and fine fibers. Asbestos material has many benefits and roles in industrial activities. The purpose of this study was to determine the effect of asbestos filler on cooling tower performance induced draft counter flow on the effect of variations in initial water temperature and air velocity, and the effect of effectiveness, water-air ratio, cooling capacity, evaporation loss and L / G value. This research on the performance of cooling towers with asbestos fillers obtained a higher value of effectiveness and cooling capacity than cooling towers without using fillers. This is evidenced by the highest value of effectiveness obtained by cooling towers using fillers of 83.26%, while the highest value for cooling towers without using fillers is 80.24%. The highest value of cooling capacity in a cooling tower using filler material is 10.34 kJ / s, while the highest value for a cooling tower without using a filler is 9.70 kJ / s. Keywords: Asbestos, Cooling tower, Industry
ANALISIS PENGARUH VARIASI MASSA LPG SEBAGAI REFRIGERAN TERHADAP PRESTASI KERJA DARI LEMARI ES Alfons Erick Perkasa; Nasrul Ilminnafik; Digdo Listyadi
ROTOR Vol 6 No 1 (2013)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1715.606 KB)

Abstract

Refrigerant is a fluid acting on a cooling machine that plays an important role in a carnot cycle cooling engine. In study was done by looking at the effect of adding refrigerant mass variation of the COP (Coefficient of Performance) by using a refrigerant-based non-Freon refrigerant that use LPG (Petrileum Liquefied Gas). In this study using the LPG mass variations 50 grams, 80 grams and 90 grams and use R-12 refrigerant. From the research conducted, the results obtained from the performance engine cooling using refrigerant 80 grams times higher than that using the mass 50 grams and 90 grams, the highest coefficient of performance that is equal to 6,30 The result of research conducted, the result that the COP of the vapor compression machine (fridge) with a variation of the mass is the mass composition 80 grams is best used to obtain the greatest COP. Keyword : carnot’s siklus, COP (Coefficient of Performance), LPG(Liquefied Petrileum Gas)
ANALISA VARIASI JUMLAH LILITAN PADA ALAT PENGHEMAT BAHAN BAKAR TERHADAP EMISI GAS BUANG MOTOR BENSIN 4 LANGKAH Pratama PEP; Digdo Listyadi
ROTOR Vol 7 No 1 (2014)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (197.584 KB)

Abstract

Process combustion of fuel in room burn to be influenced by many factor , among others is temperature, closeness of mixture, composition, and turbulensi exist in mixture. When fuel temperature with air mount, hence will progressively easy  to  fuel with  the air  to on  fire.Gas emission  throw away which  is yielded  from combustion  process  at motor  vehicle  can  have  the  character  of  poison  and make  negative  effect  at environment around, the mentioned in causing by less perfect combustion process, gas result of less the combustion perfect for example is CO, HC.The purpose of this study was to determine the effect of the use of electromagnets  in  the  fuel  line gasolin engine 4 step with variations  in  the number of windings on exhaust emissions and  fuel consumption  . The study was conducted  in Laboratory Convert Energi Majors Technical Engineering Faculty Of Technique University Jember . Equipments which  is used  in  the  testing  is Motor gasoline 4 Step with machine brand Honda Supra x  125D, Gas Analyzer , buret, measure glass,  stop wach, tachometer , and accumulator 12 volt. used by materials is Premium RON 88, strand of metal  have diameter to 0,6 cm, pipe  have diameter to 1" with length 12 cm, and ring 18 cm.This study focuses on the variation of the number of windings on fuel saving devices on exhaust emissions of petrol 4 step. Analysis of the data sought includes AFR, Magnetic Field, Ampere each variation, emissions of CO gas (%), CO2 emissions (%), HC emissions (ppm), O  gas emissions (%). Fuel Consumption (FC). From the research  2conducted,  it can be concluded  that  the  larger  the number of winding electromagnets,  the more binding  the amount of oxygen in the combustion chamber , so it would be more optimal combustion. The lower the value of the FC (Fuel Consumtion), the lower the fuel consumption required for the performance of the engine. Variations in the amount of electromagnetic windings affect fuel consumption  . Fuel consumption is  the most efficient use of  the variation  found  in  the number of windings of  the coil 1000  fuel standard state conditions of 0.57 Kg / hr to 0.43 Kg / h at 3000 RPM rotation with increased efficiency of about 8.14% . Although these results are smaller than the results of previous research by 20.35 % , but at engine speed 9000 RPM FC  results of  this  study  resulted  in a  lower ,  ie 0.81 Kg  / hour compared  to 1.19 Kg  / hour.   Keywords : Magnetic Field, Emission Gas  throw away  , Fuel Consumtion.
ANALISIS UNJUK KERJA MESIN DIESEL DENGAN BAHAN BAKAR CAMPURAN PERTADEX DAN BIODIESEL DARI BIJI KEMIRI Moh. Wafir; Digdo Listyadi; Rahma Rei Sakura
ROTOR Vol 12 No 2 (2019)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.257 KB) | DOI: 10.19184/rotor.v12i2.16839

Abstract

The decline in fuel oil production has led to the development of alternative fuels that are renewable and more environmentally friendly. An alternative fuel that can be developed is biodiesel. In this study aims to develop alternative biodiesel fuels as a substitute for fossil oil fuels that are feasible applied to diesel engines. This study conducted a diesel engine performance test using mixed fuel from pertadex and biodiesel Aleurites Moluccana with a variation of biodiesel mixture B10, B20, and B30. From the test results using a mixture of biodiesel, the ef ective power and torque produced by the engine decreases compared to using pure pertadex. Among the three variations of the biodiesel mixture, the best ef ective power produced by B10 fuel is 277 Watt and the best torque produced by B10 fuel is 1,238 Nm. Specific fuel consumption in all biodiesel blends is increased compared to pure pertadex. Among the three variations of the biodiesel mixture, the best specific fuel consumption produced by B30 fuel is 1197,67 g/kWh. The thermal ef iciency in all biodiesel blends is increased compared to pure pertadex in B20 and B30 blends. Among the three variations of the biodiesel mixture, the best thermal ef iciency produced by B20 fuel is 7,883 %. The opacity of the engine exhaust gas produced in all biodiesel mixes is getting better compared to using pure pertadex. The best opacity of the engine exhaust gas produced in the use of B30 fuel is 2,3% HSU. Keywords: Biodiesel, Aleurites Moluccana, Diesel Engine Performance, Opacity
Co-Authors Achmad 'Ima Duddin Agus Subekti Prakoso Ahmad Adib Rosyadi Ahmad Fittoyo Ahmad Khoirul Anwar Ahmad Syuhri Alfons Erick Perkasa Alfons Erick Perkasa, Alfons Erick Alif Puspita Ningrum Alvin Ulil Amriansyah Anuary Dwi Rosyid, Wafa Prasetia Ardila Dwi Tresna Aris Zainul Muttaqin Bambang Sugiharto Boy Arief Fachri Dedi Dwilaksana Dewi Liesnoor Setyowati Dian Purbasari Dwi Djumhariyanto Fachriza Putra Pratama Gaguk Jatisukamto Gilang Firmansyah, Gilang Hadiatama, Intan Hari Arbiantara Hary Sutjahjono Hasby R Ilminafik, Nasrul Ilmninafik, Narsul Imam Sholahuddin Imam Sholahudin Intan Hardiatama Khamdan Khavivi Kristianta, FX KW, Robertoes Koekoeh M Asrofi M Edoward Ramadhan M Nurkoyim Kustanto m. Fahrur Rozy H. Mahros Darsin Misto Misto Moch. Rizal A. Y. Moch. Rizal A. Y., Moch. Mochamad Asrofi Mochamad Edoward Ramadhan Moh. Wafir Muhammad Trifiananto Nashrullah, M Dimyati Nasrul Ilminafik Nasrul Ilminnafik Naufan Arviansyah Nofal Kharis Nofal Kharis Kharis Noor HS, Skriptyan Nur Koyim Kustanto Oktafian Nanda Nusila Pratama PEP Pratama PEP, Pratama Puranggo Ganja Widtyo Rachmad Dwi Fitriansyah Rahma Rei Sakura Rika Dwi Hidayatul Qoryah Rohman T. Rohman T., Rohman Salahuddin Junus Salwasana, Allisa Santoso Mulyadi Sembada, Iqbal Varian Sholahudin, Imam Sumarji Valerian, Joey Yuni Hermawan