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Muhamad Jafri
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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 200 Documents
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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.
Karakteristik Tabung Udara Pada Pompa Hidram Muhamad Jafri
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 5 No 1 (2018): April 2018
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

The purpose of this paper is to provide the fact that the air tube of a hydram pump. The method used in making this paper is to collect several published research articles on the effect of using an air tube on a hydram pump. The data obtained were analyzed to get air tube water on the hydram pump. The results of the analysis show that the use of an air tube has a good effect on improving the performance of the hydram pump. The greater the volume of the air tube, the higher the discharge air and the higher the pump efficiency.
Analisis Kebutuhan Energi di Universitas Nusa Cendana Tahun 2018-2050 Menggunakan Perangkat Lunak Long-range Energy Alternative Planning system (LEAP) Yorim A. Masus; Ben V. Tarigan; Jefri S. Bale
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 6 No 01 (2019): April 2019
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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Abstract

Energy management in an agency, especially at the University of Nusa Cendana, is still very high dependence on fossil energy. The growth in consumption of electricity and fuel oil continues to increase by an average of 20% per year. Changes in energy consumption are increasing due to changes in power tariffs from 13.2 killovolt amperes (kVa) to 650 killovolt amperes (kVa). In projecting energy demand, the author uses LEAP Software (Long-range Energy Alternative Planning system) version 2017.011.0 from 2018-2050. The purpose of this study was to analyze and determine the treatment of the dependent and independent variables on the magnitude of the results of energy needs at the University of Nusa Cendana. The projection results obtained from the total final energy demand of the Undana sector which is estimated to reach 1,685 kilowatts by 2050 or equivalent to 1.7 megawatts with an average growth of 30%. Meanwhile, for the transportation sector, the final energy demand for fuel (diesel and premium) for vehicle operations is estimated to reach 150.8 thousand barrels by 2050 with an average growth of 38%. The elasticity of energy used shows an increase of 1% after 2018. Energy conservation in the user sector shows potential efficiency of 716.7 kilowatts or equivalent to 0.717 megawatts in 2050, with an average growth of 37% against the Business As Ussual (BAU) scenario.
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.
Studi Kinerja Teoritis Dan Konsumsi Energi Pengkondisian Udara Menggunakan R22 Dan R290 Matheus M. Dwinanto; Wenseslaus Bunganaen; Indra H. Syaifullah
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

The use of more environmentally friendly hydrocarbon refrigerants in air conditioning systems has become a demand and a central issue in the future. This article presents the simulation results of the comparison of the use of R22 and R290 on the performance and energy consumption per year of air conditioning systems. The thermodynamic analysis of the system using the two refrigerants used CoolPack software version 1.50 at various evaporation temperatures, with the condensation temperature held constant. The important quantities analyzed are refrigerant mass flow rate, compressor pressure ratio, and refrigerant gas temperature leaving the compressor, heat release in the condenser, compressor power, performance coefficient, and energy consumption. The results of this study indicate that the performance and energy consumption of systems that use the two types of refrigerants basically have no significant difference. However, the R290 has a much lower compressor exit temperature which results in a longer compressor life. In addition, R290 is more environmentally friendly than R22, so the use of R290 is highly recommended.
Pengaruh Resonansi Terhadap Perubahan Efisiensi Perangkat Oscillating Water Column (OWC) Jahirwan Ut Jasron
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.v8i01.5654

Abstract

Oscillating water column (OWC) is the most promising wave energy converter to be applied because of its simple mechanical structure. To achieve maximum energy conversion efficiency, the device structure's incident wave frequency and natural frequency must be resonant. This paper discusses several factors that cause resonance, such as the incident wave period and the comparison of the length of the submerged front wall with the size of the inlet opening (a/c) and their effect on the efficiency of the OWC. The test results explain a resonance condition in which the a/c ratio of 0.67 in the wave period of 1.3 s produces a maximum efficiency of 24.13%.

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