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PENGGUNAAN WATER HEATING PADA MESIN PENGKONDISIAN UDARA SEBAGAI ALAT PENGENDALI KELEMBABAN UDARA DI DALAM RUANG OPERASI DI RUMAH SAKIT Wardoyo Wardoyo
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 7, No 2 (2015): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

This research was aimed to observe the performance of water heating as an air moisture controller device in a hospital surgery room. The way the research was outside air in 27 degrees until 30 degrees celcius and moisture of 60 until 70 percent made suitable with requirement conditions determined for surgery room in the hospital i.e. 19 until 24 degrees celcius and moisture of 45 until 60 percent. To make that condition, the surgery room was equipped with air conditioner machine and water heating as an air moisture controller device. Hot water was circulated in water heating and air moisture was measured by a hygrometer. Out of this research it obtained: measuring moisture value higher than theoretic moisture value. Calorie volume in water heating increased with water volume that was constant so that water heating could control air moisture. There was a suitability in an air moisture ratio and calorie volume in water heating so that air moisture in surgery room could be measured as requirements.

MEMBANDINGKAN KINERJA MESIN BENSIN DUA LANGKAH SATU SILINDER PADA SEPEDA MOTOR MENGGUNAKAN VARIASI CAMPURAN BAHAN BAKAR MINYAK HASIL PROSES PIROLISIS SAMPAH PLASTIK DAN PREMIUM DENGAN PREMIUM MURNI Wardoyo Wardoyo
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 2 (2016): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

This research was aimed to know the performance of engine using variation of plastic waste pyrolysis and premium process result-gasoline fuel mix and pure premium and comparing with pure premium. The fuel mix variation used consisted of 20% plastic waste pyrolysis process result oil, 80% premium and 49%plastic waste pyrolysis process result oil, 60%premium. The research procedures included firstly the tested engine given pure premium fuel and the engine was run for 2-3 minutes by installing a transmission gear in 4th position, then rotation, torsion, power and specific fuel consumption was measured. Furthermore, the engine was stopped and the fuel was substituted with varied plastic waste pyrolysis process result oil mix, the engine was re-run. The measurement rotations, torsion, power and specific fuel construction was conducted by the same way with pure premium fuel testing. Out of test results for the same rotation of 5000-8000 engine RPM using fuel mix of 20% plastic waste pyrolysis process result oil the average power was 10.04 HP, average torsion of 11.10 Nm, specific fuel consumption of 0.100 kg/hour HP and engine using fuel mix of 40% plastic waste pyrolysis process result oil the average power was 9.7 HP, average torsion of 10.82 NM, specific fuel consumption o f 0.068 kg/hour HP. While using pure premium the average power was 9.8 HP, average torsion of 10.94 Nm, specific fuel consumption was 0.103 kg/hour HP. If compared, so that engine performance using fuel mix of 40% plastic waste pyrolysis process result oil and 60% premium almost approached engine performance using pure premium fuel and actually 20% fuel mix of plastic waste pyrolysis process result oil and 80% premium was better.

Pengaruh Suhu terhadap Rendemen dan Nilai Kalor Minyak Hasil Pirolisis Sampah Plastik Wirawan Widya Mandala; M Sigit Cahyono; Syamsul Ma`arif; H B Sukarjo; Wardoyo Wardoyo
Jurnal Mekanika dan Sistem Termal Vol 1, No 2: Agustus 2016
Publisher : Universitas Janabadra

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (770.345 KB)

Plastic waste is one type of waste that would disturb the environment if it is not handled properly. Alternative treatment to solve this problem is by using pyrolysis technology that enable to convert plastic waste into fuel oil, charcoal, and non-condensable gas. The success of pyrolysis technology is influenced by several factors, including the type of reactor, the particle size, the processing time, and the temperature of the pyrolysis process. The purpose of this study was to determine the effect of temperature on the yield and the calorific value of plastic pyrolysis oil. Based on the experiments, increasing the temperature, the yield of the oil produced and calorific value will be higher. The yield and the highest calorific value generated for the pyrolysis process at a temperature of 400 0C, are 44% and 10,292 cal/ g respectively.

Analisa Kuat Arus Listrik dan Waktu Electroplating Nickel-Chrome terhadap Kekerasan dan Ketebalan Lapisan Permukaan Baja Karbon Rendah Sumpena Sumpena; Wardoyo Wardoyo
Jurnal Engine: Energi, Manufaktur, dan Material Vol 4, No 2 (2020)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v4i2.809

The metal plating industry needs not only for corrosion resistance, but also for the strength of the material, having a decorative appearance, and having high economic value. Several types of coatings can be used to prevent or slow down the level of damage and increase the mechanical strength of the metal, one of which is electroplating. The purpose of this study was to determine the effect of variations in electric current strength and time of electroplating nickel-chrome on the hardness and thickness of the surface layer of low carbon steel. Experiments were carried out by observing changes in the independent variables, namely the electroplating process time of 10 minutes, 15 minutes, and 20 minutes. The controlled variable in this study is the 5 Ampere power supply current. While the current strength used in this study is 0.5 A, 1 A and 1.5 A. The test results show the electroplating process with a strong current of 0.5A in 10, 15 and 20 minutes, namely 132.63 VHN, 189.03 VHN, and 172.36 VHN. The electroplating process with a current of 1A obtained hardness values of 201.66 VHN, 187.96VHN, and 187.53VHN. The electroplating process with a current of 1.5A obtained hardnessvalues of 191.13VHN, 195.1VHN, and 182.13VHN. The highest hardness was at 1A, the coating time was 10 minutes. While the lowest hardness was at 0.5A current, the coating time was 10 minutes.

Pengaruh Variasi Temperatur Hardening dan Tempering Paduan AlMgSi-Fe12% Hasil Pengecoran terhadap Kekerasan Sumpena Sumpena; Wardoyo Wardoyo
Jurnal Engine: Energi, Manufaktur, dan Material Vol 2, No 1 (2018)
Publisher : Proklamasi 45 University

The purpose of this research is to know the effect of Heat Treatment Hardening-Tempering Alloy AlMgSi–Fe12% foundry result to hardness and toughness. The test was carried out on raw material and material test specimen after obtaining Hardening heat treatment at 600℃ and quenching with SAE 20 oil medium. While Tempering variation at temperature 200℃, temperature 250℃ and temperature 300℃ with detention time for 15 min at each temperature, each heat treatment. Hardness testing method is done by standard micro Vickers test method with 100 gf loading. The result of raw material testing for hardness value is 60,92 VHN. Test results after heat treatment process at temperature 200℃ cause hardness value increased by 63,50 VHN. At temperature 250℃ cause hardness value decreased to 59,94 VHN. At temperature 300℃ cause hardness value increase to 76,98 VHN

Pengaruh Kadar Waterglass Sebagai Bahan Pengikat Cetakan Pasir Kering Dengan Metode CO_2 Terhadap Kekerasan dan Kekuatan Tarik Sumpena Sumpena; Wardoyo Wardoyo; Hb Sukarjo
Jurnal Engine: Energi, Manufaktur, dan Material Vol 5, No 1 (2021)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v5i1.851

Salah satu hal yang sangat mempengaruhi hasil pengecoran besi tuang adalah penggunaan pasir cetak dan bahan pengikat pasir cetak. Bahan pengikat kimia yang digunakan dalam membuat cetakan pasir salah satunya adalah waterglass yang mengandung Sodium silicate hydrate sehingga akan mengeras setelah dialiri gas CO_2. Kadar waterglass pada cetakan pasir mempengaruhi permeabilitas dan konduktivitas pasir. Sifat konduktivitas ini mempengaruhi laju pendinginan logam cair. Laju pendinginan yang terjadi pada proses pengecoran mempunyai peranan penting dalam pembentukan struktur mikro, dimana struktur mikro mempengaruhi sifat mekanik yang dimiliki oleh benda cor. Tujuan penelitian ini adalah untuk mengetahui pengaruh variasi kadar waterglass sebagai bahan pengikat cetakan pasir kering dengan metode CO_2 terhadap kekerasan dan kekuatan tarik produk pulley. Pada penelitian ini, pasir yang digunakan adalah pasir silika dengan variasi kadar waterglass 8%, 13%, 18%, 23%, kemudian cetakan dialiri gas CO_2 dengan tekanan 1 kgf/〖cm〗^2 selama 5 menit. Komposisi cairan logam yang digunakan dalam pembuatan spesimen adalah 91% tatal, 2% karbon dan 0,7% sillikon. Penuangan cairan logam dilakukan menggunakan ladel pada suhu sekitar 1300°C. Hasil penelitian menunjukan bahwa nilai kekerasan tertinggi pada cetakan dengan kadar waterglass 23% sebesar 238,7 BHN, dan kekerasan terendah pada cetakan dengan kadar waterglass 18% sebesar 200,2 BHN. Kekuatan tarik tertinggi diperoleh pada cetakan dengan kadar waterglass 23% sebesar 163,5 MPa, dan kekuatan tarik terendah pada cetakan dengan kadar waterglass 13% sebesar 128,28 MPa.

Pengaruh Variasi Temperatur Quenching pada Aluminium Paduan AlMgSi-Fe12% terhadap Keausan Wardoyo Wardoyo; Sumpena Sumpena
Jurnal Engine: Energi, Manufaktur, dan Material Vol 2, No 1 (2018)
Publisher : Proklamasi 45 University

The purpose of this research is to determine the effect of heat treatment hardening of AlMgSi-Fe12% casting aluminium alloys on wear. The tests were carried out on specimens of raw materials and heat-treated specimens with variations of temperature used were 550 oC, 575 oC, 600 oC, and 625 oC, and used 15 minutes of holding time in each heat treatment, then quenching in SAE 20 oil. The method used for wear-tested was high speed ogoshi universal testing machine wear. The result had shown on raw material a specific wear rate was 2.256102E-07 mm2/kg. Test results on the specimens that have received heat treatment hardening temperature 550 oC increased the wear value decreased to 1.7471E-07 mm2/kg. In materials with temperature heat treatment, 575 oC causes wear values were increased when compared with raw material, respectively, 2,83739E-07 mm2/kg. In materials with temperature heat treatment 600 oC also causes wear values were increased when compared with raw material, respectively, 2,65105E-07 mm2/kg. Test results on the test material that has received heat treatment temperature 625 oC increased the wear value decreased to 2.16777E-07 mm2/kg.

Pengaruh Perubahan Diameter Lubang Saluran Keluar Jetmain dari 2,5 mm menjadi 2,8 mm pada Karburator terhadap Kinerja Mesin Bensin Empat Langkah Satu Silinder pada Sepeda Motor Wardoyo Wardoyo; Andi Putro Sukendro
Jurnal Engine: Energi, Manufaktur, dan Material Vol 1, No 1 (2017)
Publisher : Proklamasi 45 University

This study aimed to compare the influence of the hole diameter of the outlet of the main jet from 2.5 mm to 2.8 mm on the carburetor to the engine performance and fuel consumption.The test is performed with the brand gasoline motor honda tiger type GL 200 R four-stroke single cylinder. The materials studied were the main jet. Tests performed with standard conditions in without making any changes. Testing machine at the ready on a dynamometers test bed. Then do the testing phase and retrieval of data that is torque and fuel consumption. Torque (Nm) play a modified jet yield increase of 2.2% from the main jet standard. Power (kW) jet modification produces a maximum power of around 2.2% of the main jet standard. The rate of fuel consumption (mf) on the main jet modification is greater than the main jet standard. Fuel consumption (sfc) on the main jet modification will further increase the standard of the main jet. Calorific fuel (Qi) in the main jet modification is greater than the main jet standard. Jet played modifications that do not significantly change the main jet standard.

Analisa Kekerasan dan Keausan Cylinder Sleeve dari Besi Cor Kelabu FC250 Hasil Sand Mold Casting Sumpena Sumpena; Hb. Sukarjo; Wardoyo Wardoyo; Soksono Singgih Pramana
Jurnal Engine: Energi, Manufaktur, dan Material Vol 5, No 2 (2021)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v5i2.944

The Cylinder sleeve is an engine component that is mounted on the cylinder block which functions as a piston glide base. The cylinder sleeve is made of FC250 gray cast iron. FC250 is a gray cast iron that has lamellar graphite with a tensile strength of at least 250 MPa. This study aims to determine the mechanical properties of hardness and wear of the Cylinder Sleeve made of gray cast iron FC250. The method used in this research is gray cast iron which is cut with a length of 5.5cm, thickness 0.7cm, height 0.7cm which is formed according to the standard size of the hardness and wear test. The tests carried out include testing brinell hardness and wear. The results showed that the lowest hardness value was 134.63BHN and the highest hardness value was 191.43BHN. The increase in hardness values is influenced by the carbon content that cannot be spread evenly, which is followed by a fast cooling rate. The results of the wear test obtained the lowest price of 0.00017mm³/kg.m and the highest wear price of 0.00028 mm³/kg.m.

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