Machine : Jurnal Teknik Mesin

STUDY THERMAL OF COMPRESSOR POWER REDUCTION ON USING SOLID DRY PAD PRE-AIR COOLING SYSTEM

I Gede Teddy Prananda Surya, Hendra Wijaksana — Wed, 08 Nov 2023 08:53:41 +0000

Abstract
The uses of compressor based air conditioning system has rapidly increased the consumption of fossil fuel energy resources and the degradation of environment quality. Massive study has been done worldwide to reduce energy consumption for compressor based air conditioning (AC) system. This study is subjected to investigate the use of solid dry pad as pre-air cooling for AC system. In this study, solid dry pad would be placed in the evaporator and condenser inlet air side. This placement was objected to give a pre-cooling effect for evaporator and condenser inlet air, so then the compressor could be operated with a lower power consumption. The experiment would be carried out within three level air mass flowrate of 0.293 kg/s; 0.319 kg/s; and 0.359 kg/s, for air velocity of 2.2; 2.4; and 2.7 m/s respectively, the cooling cabin is set into 30oC using a heater as a cooling load. As a results, it could be revealed that at the highest air mass flowrate of 0.359 kg/s, it could achieved the lowest compressor power consumption of 0.44 kW, within a higher cooling capacity of 2.625 kW, a higher condenser heat rejection of 3.622 kW and also higher COP of 5.9. Referring to those results, it can be concluded that when employing solid dry pad pre-air cooling for evaporator and condenser AC system, it could reduced compressor power consumption by 12.2%; 21.9% and 20% for air velocity of 2.2; 2.4; and 2.7 m/s respectively.
Keywords : solid dry pad, pre-air cooling, compressor power reduction.

PENGARUH PARAMETER PENGELASAN TERHADAP HASIL UJI BENDING DENGAN STANDAR AWS PADA BAJA ASTM A36

Rika Veronika, Hamid Abdillah, Ma’mun Hidayat, Irwan Kalam Nainggolan — Fri, 10 Nov 2023 03:40:43 +0000

In this modern era, technology is progressing rapidly, including welding techniques. In this welding process, a welder has a manual called WPS (Welding Procedure Specification). The role of WPS in welding is very important, this is because WPS is made to achieve good welding results and according to what is desired. Therefore, research regarding the suitability of WPS with welding results was carried out. This study uses an experimental method by performing GMAW (Gas Metal Arc Welding) welding in the 1G position and the test process is carried out with a bending test. This bending test process is carried out to find out whether the WPS used is in accordance with the desired results or not. In the bending test results that have been carried out by welding experiments twice, the bending test results are 3.528 kN/mm 2 . In this welding process, more optimal results were obtained using the amperage parameters of 94A – 106A and a voltage of 23 V – 25 V. In this process no visual welding defects were found so that this WPS could be used by trainees.

RANCANG BANGUN TERMOKOPEL DATA LOGGER BERBASIS ARDUINO MEGA 2560 SKALA LABORATORIUM

Fri, 10 Nov 2023 00:00:00 +0000

Pengukuran suhu merupakan salah satu hal yang terpenting dalam mengukur kinerja suatu proses pindah panas. Pengukuran suhu biasanya dijumpai di lapangan menggunakan termometer air raksa atau sensor suhu yang memiliki display digital dan dicatat manual. Pengukuran suhu dengan menggunakan cara ini mulai ditinggalkan karena untuk mengetahui kinerja suatu mesin dibutuhkan data yang banyak agar dapat diperoleh kinerja mesin yang akurat. Data logger adalah alat yang sering dijumpai dalam pengukuran suhu baik di laboratorium-laboratium teknik di kampus maupun industri. Data logger merupakan alat ukur suhu yang termutakhir hari ini. Hanya saja data logger yang tersedia di pasaran masih mahal sehingga butuh biaya lebih untuk membelinya. Arduino merupakan mikrokontroler dengan harga yang terjangkau dan dapat disambungkan dengan berbagai sensor dan dapat dirancang layaknya seperti data logger. Metode yang digunakan pada penelitian adalah rancang bangun dengan mengembangkan termokopel data logger. Hasil penelitian menunjukkan bahwa 12 channel termokopel tipe-K dengan penguat sinyal Max6675 dapat berfungsi dan data dapat dikumpulkan ke Micro SD.

DESIGN AND CONSTRUCTION OF GEAR WHEEL ALIGNMENT SETTING TOOLS AS A LEARNING MEDIA IN THE MACHINE REPAIR AND MAINTENANCE LABORATORY

Fri, 10 Nov 2023 03:41:53 +0000

Alignment is a technique used to maintain machine components that rotate or transfer power so they can operate as effectively as possible and prevent damage to other machine components from errors made during installation or maintenance. Alignment is a maintenance activity that is often carried out on machines in industry and machines within the Morowali Metal Industry Polytechnic, especially in the Mechanical Maintenance Engineering Study Program. Competency in the alignment of gears and bearings is very much needed for prospective mechanics in the industry. The purpose of making this tool is as a simulation tool for learning alignment to achieve straightness and centricity between two rotating shafts (drive and driven shaft) to prevent friction, vibration, and other problems that can reduce tool life and, of course, increase expenditure costs. for repair or replacement of heavy equipment. In the process of designing this alignment tool, a drive method is used in the form of a sprocket and chain, where the link between the drive motor and the shaft to be moved is the sprocket and chain method. This research serves to help produce a design by considering the user's perspective so that the design results can be useful effectively. From the test results, the gear alignment setting tool can function well with the help of an inverter so that motor rotation can be reduced and can be controlled according to the desired conditions. The previous alignment setting tool had an RPM: of 1450.8 and the alignment setting tool that was made had an RPM: of 1455.7 with a frequency of 50 Hz so it can be concluded that this tool can be used for practical work in machine repair and maintenance laboratories.

PENGARUH VARIASI TEMPERATUR TOREFAKSI TERHADAP KARAKTERISTIK DAN NILAI KALOR DARI PRODUK BRIKET ARANG ECENG GONDOK

Muhammad Zainul Aris, Yasir Amani — Tue, 14 Nov 2023 05:18:47 +0000

Energy is needed by all people in various countries, this results in climate change and depletion of energy, it is necessary to find clean alternative energy, one of which is biomass. Water hyacinth is a biomass that grows rapidly in Indonesia, but its energy density is still low. This research aims to improve the characteristics and calorific value of water hyacinth biomass using torefaction process. In this study, water hyacinth was subjected to a torefaction process with temperature variations of 200 ℃, 250 ℃ and 300 ℃ and a holding time of 1 hour. ¬The biochar resulting from the torefaction process is then made into briquettes using tapioca starch adhesive, with a ratio of 10% of the weight of the raw material, and pressing at a pressure of 300 kg/cm2. From the research and testing that has been done, the proximate test results obtained the lowest moisture content of 5.75% in the 300 ℃ sample, the lowest ash content of 17.65% in the 200 ℃ sample, the lowest volatile compounds of 39.52% in the 300 ℃ sample and the highest fixed carbon of 25.92% in the 300 ℃ sample. The highest heating value was produced in the 300 ℃ sample which amounted to 5140.44 cal/g. The lowest Shatter Index was 1.68% in the 300 ℃ sample. The most optimal burning rate of briquettes in the 300 ℃ sample was 0.085 g/min with a duration of 47 minutes. The results of this study indicate that the torefaction process and torefaction temperature variation have a significant effect on the characteristics and heating value of water hyacinth briquettes.

Key words : Torefaction, Water Hyacinth, Characteristics, Calorific Value, Briquettes.

MENINGKATKAN KAPASITAS PRODUKSI SUSU KEMASAN KALENG MELALUI PERANCANGAN MESIN PALLETIZING

Dadan Heryada Wigenaputra, Ade Ramdan, Fajar Akbar — Thu, 16 Nov 2023 05:54:41 +0000

Sebuah perusahaan produsen susu kemasan kaleng membutuhkan sebuah improvment pada proses produksinya yang menginginkan proses produksi menjadi otomatis. Salah satu prosesnya yaitu memindahkan kaleng menuju twister minimal 1200 pcs/jam untuk jenis 400 gram dan minimal 600 pcs/jam untuk jenis 600 dan 800 gram. Untuk mengatasi permasalahan tersebut, maka perlu dibuat sebuah rancangan mesin palletizing untuk memindahkan tumpukan kaleng menuju twister secara otomatis. Mesin yang dirancang harus mampu menahan beban dari tumpukan kaleng pada saat proses memindahkan kaleng menuju twister. Proses perancangan menggunakan metodologi VDI 2206 dari mulai menetapkan requirement, system design, domain-spesific design, system integration, verification/validation, sampai dengan menghasilkan produk. Hasil proses perancangan telah menghasilkan sebuah rancangan yang mampu memindahkan kaleng menuju twister sebanyak 1500 pcs/jam untuk jenis kaleng 400 gram dan 810 pcs/jam untuk jenis kaleng 600 dan800 gram. Konstruksi mesin palletizing sangat aman, karena beberapa komponen telah dianalisis kekuatannya dan memiliki faktor keamanan minimal 3,8.

ANALISA PERAWATAN INTAKE PUMP DENGAN MENGGUNAKAN METODE RISK BASED MAINTENANCE (RBM)

Ozkar F. Homzah, Ella Sundari, Rizky Brillian Yuliandi, Femi Permata Sari — Thu, 16 Nov 2023 00:00:00 +0000

Intake Pump is one of the important equipment in the steam power plant of 3x10 MW electrical generator which functions to supply raw water to production of demin water, domestic water and service water. In the process of producing water through the intake pump there are several components of the intake pump that often experience damage, this can be a loss for the company, therefore requiring additional processing. In this study, the Risk Based Maintenance (RBM) method was carried out to achieve optimal maintenance by knowing the impact and risk of failure according to important intake pump components, namely impeller, bearing and shaft. Based on the analysis results of the RBM calculation, the consequences of risks accepted is low to 0.05% by the company that achieved to 221,498,196.507 Indonesian rupiah it’s to 0.13% of production capacity per year. This value exceeds the acceptance risk tolerance of 0.13% which has become a company provision. Therefore, it is necessary to plan the proposed maintenance period from the existing policy, which is carried out 48 times a year for each critical component such to reducing the number of consequences and risks to 198,002,597 Indonesian Rupiah or equal to 0.01%.

VARIASI SUDUT POTONG DAN KECEPATAN POTONG TERHADAP LAJU PEMAKANAN MATERIAL SCM 440

Arianda Pratama, Zaldy Kurniawan, Husman -, Ilham Ary Wahyudie — Fri, 17 Nov 2023 05:27:40 +0000

During the workpiece turning process, several factors affect the final workpiece, such as the cutting angle and cutting speed. The purpose of this study was to determine the effect of variations in cutting angle and cutting speed on the material consumption rate of SCM 440. The method used in this study is the Response Surface Methodology (RSM), with a two-parameter design, each of which has three levels for each parameter variation. . The results of data analysis obtained eigen values with different signs (positive and negative) which indicated that the stationary point values were in the form of saddle points with a stationary point values of x₁ (cutting angle) of -1.686 and x₂ (Vc) of 0.199. From the uncoded process, the optimal value for the MRR factor is obtained, namely the cut angle of 10.64° and Vc of 15.28 m/min. The optimum feed rate for SCM 440 material is obtained at an optimal value of neither minimum nor maximum or a saddle point shape at a cutting angle cut of 10.64° and Vc of 15.28 m/min with an MRR area of 300-400 mm3/minute.

PENGEMBANGAN MESIN PEMISAH KULIT POLONG KACANG HIJAU UNTUK PENINGKATAN KAPASITAS DAN EFISIENSI PEMISAHAN BIJI

Ahmad Nurul Muttaqin, Uswatul Hasanah Mihdar, Arfandy Arfandy — Fri, 17 Nov 2023 08:55:05 +0000

The objective of this study is to improve the quality and efficiency of the verification process which is crucial for processing green bean seeds by upgrading the green bean skin separating machine. This change entails improving engine rotation in addition to changing engine mechanics and parts. The engine was tested at 350 rpm, 425 rpm, and 500 rpm during the experimental phase. According to the data, 350 rpm is the ideal engine speed for separating green bean seeds from the pod skin, with a differential capacity of 54 kg/hour. When ninety percent of the green bean seeds are undamaged and out of the pod skin, they are combined with other components. This machine may serve as a commercial solution to improve the quality and efficiency of processing green bean seeds. These encouraging outcomes highlight how important technology is to the agro-industrial and agricultural sectors. By processing green bean seeds more effectively and of higher quality, technology may also assist the environment and the economy.

PENGARUH PERLAKUAN SERAT SABUK KELAPA (SSK)TERHADAP MORFOLOGI DAN SIFAT AKUSTIK KOMPOSIT BERPENGUAT SSK

Mukhlis Muslimin, Kifli Umar, Ahmad Seng, Kadri Daud, Samsul Bahri LM — Mon, 20 Nov 2023 04:46:42 +0000

The research aims to determine the effect of SSK treatment with liquid smoke on the morphology and acoustic properties of SSK reinforced composites. The research method is an experimental method with variations in fiber treatment by soaking in liquid smoke for 1, 2 and 3 hours. Next, after soaking the fiber, it is heated in an oven at 40ºC for 30 minutes, then the resulting fiber morphology is observed using a JEOL JCM 6000 SEM tool then SSK reinforced composites are made for acoustic testing, specimen making is done by preparing resin and long fibers. 1 cm fiber, 60% resin composition and 40% SBP, after drying a composite acoustic test specimen was made. The results show that SSK treatment with liquid smoke increases the fiber morphology to become rough and porous, so that the SSK reinforced composite has a sound absorption coefficient value for the SSK TP composite of 0.1175 db, while the SSK P1J, P2J, and P3J composites have a sound absorption coefficient value of 0.1304, 0.1199, and 0.1181 db. , this shows that the SSK P1J composite is better in sound absorption by 10.92% when compared with SSK TP, so it can be recommended as an environmentally friendly acoustic material.