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LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Published by Universitas Nusa Cendana
ISSN : 23563222     EISSN : 24073555     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Lontar Jurnal Teknik Mesin Undana merupakan jurnal ilmiah rekayasa teknologi, khususnya bidang Teknik Mesin, meliputi: Energy Convertion, Manufacture Process, Engineering Design, Material Engineering.
Arjuna Subject : -
Articles 12 Documents
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Search results for , issue "Vol 8 No 01 (2021): April 2021" : 12 Documents clear
Rancang Bangun dan Analisis Kinerja Rumah Pengering Kopi Tipe Efek Rumah Kaca dengan Mekanisme Konveksi Paksa Domi K. Dipa; Verdy A. Koehuan; Matheus M. Dwinanto
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i01.4099

Abstract

Penelitian ini bertujuan untuk merancang rumah pengering kopi menggunakan plastik ultra violet (UV Solar Dryer) dengan mekanisme konveksi paksa dan menguji performansi rumah pengering kopi. Penelitian ini dilakukan dengan melakukan perancangan rumah pengering biji kopi terlebih dahulu dan kemudian dilakukan uji performansi dari rumah pengering tersebut. Desain rumah pengering dengan ukuran 5,5 x 2,9 x 1,9 meter menggunakan cover berupa plastik ultra violet. Di dalam rumah pengering terdapat tiga buah rak permanen dengan ukuran masing-masing rak adalah 3,5 x 0,5 x 0,85 meter. Untuk mempercepat proses pengeringan, meratakan suhu bahan serta menguapkan air bahan maka dipasanglah dua buah exhaust fan dengan ukuran 0,35 x 0,22 x 0,395 meter. Uji performansi dilakukan dengan tiga variasi kecepatan udara pada exhaust fan yaitu 0,5 ; 1,0 ; dan 1,36 m/s. Besaran-besaran penting yang dianalisis adalah laju pengeringan bahan, konsumsi energi spesifik (KES) dan efisiensi penggunaan energi. Analisis teknik menunjukkan bahwa rumah pengering kopi layak untuk digunakan dalam usaha pengeringan kopi. Hal ini didasarkan pada nilai efisiensi pengeringan yang dicapai pada pengujian di pukul 14.00 dengan kecepatan udara 1,0 m/s cenderung lebih besar dari pada pengujian dengan kecepatan 1,36 m/s dan 0,5 m/s di pukul 11.00, 12.00, 13.00 dan 15.00 dengan nilai efisiensi tertinggi 19,448 %. Sedangkan untuk nilai konsumsi energi spesifik (KES) tertinggi pada pengujian di pukul 12.00 dengan kecepatan udara 0,5 m/s adalah 93824,19 kJ/kg.
Simulasi Computational Fluid Dynamic (CFD) Rumah Pengering Kopi Menggunakan Plastik UltraViolet (UV) Solar Dryer Yoseph P. Ndeo; Verdy A. Koehuan; Wenseslaus Bunganaen
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i01.4100

Abstract

Pengeringan hasil pertanian secara khusus pada biji kopi adalah pengeluaran air dari suatu hasil pertanian sampai tercapai kadar air keseimbangan dengan udara lingkungan atau sampai tingkat kadar air dimana jamur, serangga dan enzim yang bersifat merusak tidak dapat aktif lagi. Pemanfaatan energi surya dengan menggunakan plastik ultra violet (UV) juga merupakan alternatif untuk mengatasi kendala pengeringan dengan sinar matahari langsung yang umum berlaku di masyarakat seperti kapasitas yang rendah dan membutuhkan waktu yang lama. Dengan menggunakan simulasi computational fluid dynamics (CFD) dalam penelitian ini untuk dapat mengetahui distribusi temperatur dan kecepatan aliran pada rumah pengering kopi. Dari hasil simulasi CFD maupun eksperimen dengan kecepatan aliran 0,1 m/s, 0,5 m/s dan 1,36 m/s baik tanpa beban maupun dengan beban pengeringan terdapat perbedaan temperatur dimana pada kecepatan 0,1 m/s dan 0,5 m/s nilai rata-rata temperatur hasil simulasi CFD dengan model aliran turbulen lebih rendah dari hasil eksperimen sedangkan pada kecepatan 1,36 m/s relativ mendekati hasil eksperimen. Dari hasil analisis distribusi temperatur udara di dalam rumah pengering menunjukkan pada laju aliran tetap untuk waktu simulasi yang berbeda, distribusi temperatur cenderung seragam. Sedangkan pada jam 11:00 dan 13.00 dengan kecepatan rendah menunjukkan peningkatan temperatur di bagian inlet (sebelah utara rumah pengering), namun pada jam 15:00 mengalami peningkatan tempereratur pada bagian keluar rumah pengering (sebelah selatan rumah pengering)
Desain Dan Analisis Struktur Rangka Motorcycle Lift Menggunakan Perangkat Lunak Solidworks Kristomus Boimau; Matheus M. Dwinanto; Valerius G. Seranian
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i01.4185

Abstract

Structural analysis is the science of determining the effects of loads on physical structures and their components. Structural analysis combines the fields of engineering mechanics, materials engineering, and engineering mathematics to calculate deformation of structures, internal forces, stresses, bearing reactions, accelerations, and stability. The designer chooses solidwork software for design and analysis because this software can properly simulate the design and calculation of forces on machine tools and elements. Solidwork contains a collection of simulation programs that are easy to use and can be used to create part programs and material selection used for mechanical analysis at work in order to obtain stress, displacement and safety factors (factory safety). The designed motorcycle lift features a chrome stainless steel frame with a control system, with main dimensions 1800 mm length, 700 mm width and 200 mm height at minimum position, 200 kg weight and 855 mm maximum height reach. Based on the identification using REBA in the mechanical posture after the design, it was found that the risk level decreased compared to before the design, from a high risk level to a low risk level. The results of the mechanical evaluation of the use of the designed motorcycle lift, there are several things that have become shortcomings of this design, among others, in terms of the speed of time in raising the position of the motorbike and the boot of the motorcycle lift which is still too heavy.
Perancangan Rumah Pengering Biji Kopi Menggunakan Plastik Ultra Violet (UV Solar Dryer) Dengan Mekanisme Konveksi Alamiah Thomas J. Hudin; Verdy A. Koehuan; Nurhayati Nurhayati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i01.4186

Abstract

Now a days there are quite a lot of developed mechanical dryers (ERK) that use ultra violet plastic (Uv Solar Dryer) to replace the direct drying method when the weather is not supportive. UV Solar Dryer or also known as drying method using the greenhouse effect is a drying method that utilizes solar energy as the main source of heat energy for drying. The problem that will be focused in this research is to design a type of drying house (ERK) using ultra violet plastic with a natural convection mechanism which results in drying efficiency values of coffee beans ranging from 5-10%/hour. Based on the assumption that the initial moisture content of the coffee beans before drying is 60% and after going through the drying process for 16 hours, where per day the drying is carried out for 4 hours starting at 11.00 and ending at 15.00. The final moisture content of coffee beans obtained ranged from 11-12%. The drying rate obtained is 3.06% bk/hour (the level of water content evaporated for one hour of drying) where for each variation of air velocity the level of water content evaporated is the same. The highest drying efficiency obtained in this research is based on each variation of air velocity with an initial mass of 45.60 kg of material, namely at an air velocity of 0.1 m/s of 10.96%/hour occurred at 14.00, at an air velocity of 0.2 m/s at 11.53%/hour occurred at 14.00 and at air velocity of 0.3 m/s at 11.91%/hour occurred at 14.00.
Pengaruh Jumlah Sirip Heatsink Terhadap Distribusi Temperatur Pada Alat Penghasil Air Dari Udara Atmosfir Ben Tarigan; Muhamad Jafrim; Sadrak Ndollu
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i01.4187

Abstract

Water is a natural resource that is absolutely necessary for human life and in an environmental systems, water is an element of the environment. Water demand is the amount of water needed for household, industrial, urban flushing and others. One of the water-producing systems that is being developed at present is the technology of producing water from the atmosphere. This technology is desirable to condense water vapor. The amount of condensed water is proportional to the amount of heat transferred, which is related to the thickness of the layer and the temperature difference between the steam and the surface. The purpose of this study was to determine the effect of the number of heat sink fins on the temperature in the box in a water-generating technology device from atmospheric air. Variation of heat sink fins, namely 4 fins, 6 fins, 8 fins with an angle of 750. The test results show that the number of heat sink fins has an effect on the temperature distribution of each test point in the space of atmospheric water producing technology.
Pengujian Performa Pompa Air DAB Tipe DB-125B Sebagai Turbin Verdy A. Koehuan; Gusnawati Gusnawati; Phillips G. Taka Logo
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

A centrifugal pump is a pump that moves fluid by utilizing the centrifugal force generated by the rotation of the impeller. All rotodynamic pumps from radial flow type to axial flow can function as turbines. The research was conducted through experiments on the pump that functions as a turbine in this study is a regenerative pump or peripheral pump, namely water pump DAB type DB-125B. Peripheral pump is a centrifugal pump whose impeller has radial spoons in a total of 41 spoons. The results showed the best performance or performance of PAT regenerative pump system or peripheral pump, namely water pump DAB type DB-125B as a hydro power plant with flow discharge variation of 35 ltr/min, 40 ltr/min, and 45 ltr/min at constant head (8 m) is with a maximum efficiency of 15.81% at a flow discharge of 40 ltr/min and shaft rotation of 850.3 rpm. Maximum PAT output power also occurs at a flow discharge of 40 ltr/min with a turbine rotation of 985.1 rpm of 5.849 W. The addition of water power can directly increase the rotation of the PAT shaft, as well as the addition of flow discharge at a constant head (8 m), rotation the turbine rotor is also increased. Whereas the addition of flow discharge with a constant head, the output power and maximum PAT efficiency tend to occur at high rotation.
Analisis Sistem Pencegahan dan Penanggulangan Bahaya Kebakaran di Gedung Rektorat Universitas Nusa Cendana JonsJonson H. Laning; Hari Rarindo; Dominggus G. Adoe; Rima N. Selan; Adi Y. Adoe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

To build a building, it is very important to pay attention to occupational health and safety (K3) for its residents. At the Nusa Cendana University Rectorate Building, the availability of a fire prevention and control system is very important. The purpose of this study was to analyze the extent of the fire prevention and control system in the Rectorate Building, University of Nusa Cendana. The fire hazard prevention systems analyzed are Fire Alarm, Fire Detector, Light Fire Extinguisher (APAR), Automatic Sprinklers, Fire Hydrants, Upright Pipe Systems, Water Supply Systems, Fire Pumps. The fire hazard management systems analyzed are the Fire Management Organization, Fire Emergency Action Procedures, and Fire Emergency Action Education and Training. The regulations that are used as a comparison with conditions in the field are the Minister of Public Works Regulation Number 26 / PRT / M / 2008, Number 20 / PRT / M / 2009, and NFPA (National Fire Protection Association) 10, 13, 14, 72, 101, 251. Based on the results of the analysis of the fire prevention and control system at the Rectorate Building of the University of Nusa Cendana, it is known that there are systems that are by accordance with the applicable regulations and there are also systems that are not by accordance with the applicable regulations. For this reason, the management of the Rectorate Building at the University of Nusa Cendana is advised to improve the existing fire prevention and control system so that it is by accordance with applicable regulations
Analisis Potensi Angin Sebagai Sumber Penggerak Turbin Angin Savonius Di Kabupaten Timor Tengah Selatan (TTS) Ironis R. Naitio; Arifin Sanusi; Nurhayati Nurhayati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

Wind energy is an energy that cannot be separated from our daily lives. Wind is one of the renewable energies that will never run out. In addition, wind energy also does not produce pollution that can disturb the environment. This makes wind energy as one of the alternative energy that has great potential, so it is necessary to conduct research for wider utilization and in long -term use. Savonius wind turbine is one of the vertical shaft turbines (VAWT) where the savonius wind turbine has a main rotor that rotates vertically, and can utilize wind from all directions, and can work/rotate at low wind speeds. The method of data analysis that I can use in this research is to take data directly and simultaneously on wind speed, turbine rotation, and others. The results of data analysis obtained: (1) the highest average wind speed for 1 month is 5.62 m/s with a turbine rotation of 845.36 rpm (2) The highest turbine power is 104 W (3) Turbine effective power is 28.08 W (4) and The highest average efficiency is 23.34 % and the lowest is 8.86 %.
Rancang Bangun Mesin Pemarut Batang Putak Vinsen Yuminto Bifel; Defmit B.N. Riwu; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

Putak is the name of a local feed on the island of Timor, East Nusa Tenggara which is obtained from the trunk of the gewang tree (Coypha gebanga). Most of the putak processing by the people of Timor Island is very low and also limited so that putak productivity is very low because people still do it traditionally and only use it as food. Therefore, this study aims to design a putak grater for animal feed. The VDI 2221 method is a design method that uses a systematic approach to design for engineering systems and engineering products. The effective capacity of the tool is obtained by grating / repeating 3 times, then the average effective capacity of the tool is calculated. In testing the putak sticks used to produce a grated mass volume of 3,5 kg, and a tool capacity of 70 kg/hour. The results showed that the effective capacity of the putak grating machine was 70 kg/hour.
Analisis Pengaruh Panjang Sirip Heatsink Terhadap Produksi Air Kondensasi pada Alat Pengahasil Air Atmosfir Erkes Lodoh; Muhamad Jafri; Ben V. Tarigan
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i01.4758

Abstract

This study aims to determine the effect of heat sink fin length oriented at 700 on the production of atmospheric air condensation water. The method used is an experimental method of 3 converters with variations in the length of the heat sink; 8 cm, 10 cm and 12 cm. The three sizes of these heat sinks are that the length of the heat sink affects the distribution of environmental temperature, the temperature on the cold side of the heat sink, the temperature on the hot side of the heat sink, the temperature in the condensing chamber and the volume of condensed water. From the third study, the best size was the length of the 12 cm heat sink with a water production of 26.9 ml/24h.

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