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All Journal Rotasi LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Prosiding Semnastek JMPM (Jurnal Material dan Proses Manufaktur) Jurnal Pengabdian UntukMu NegeRI at-tamkin: Jurnal Pengabdian kepada Masyarakat Jurnal Fisika : Fisika Sains dan Aplikasinya ARMATUR : Artikel Teknik Mesin dan Manufaktur
Verdy A Koehuan
Program Studi Teknik Mesin, Fakultas Sains Dan Teknik, Universitas Nusa Cendana
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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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)
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.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
Pengujian Rumah Pengering Daun Kelor Dengan Efek Rumah Kaca (Solar Dryer) Melalui Mekanisme Konveksi Alamiah Aloysius V.P. Piamat; Verdy A. Koehuan; Muhamad Jafri
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 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.v8i02.5941

Abstract

This research was conducted by experimental study of moringa leaf drying process using ultra violet plastic dryer house (UV solar dryer) through natural convection drying mechanism. The results showed that the final water content of moringa leaves after drying for two days (8 hours) was 54.88 %bb with a total drying rate of 0.417 kg/hour from the assumed initial water content of 80 %bb. While the average drying efficiency of 3.49 % with specific energy consumption (KES) is quite high, which is 127180.77 kJ/kg. The highest specific energy consumption (KES) occurred on the 2nd day test at 200056.37 kJ/kg with the lowest efficiency of 2.154 %, while the lowest KES on the 1st day test was 54305,17 kJ/kg with the highest efficiency of 4.83 %. This phenomenon is very clear the influence of changing environmental weather on the drying process in the drying house. Environmental weather is very influential on the process of drying moringa leaves with a natural convection mechanism using ERK type dryer. Cloudy weather with high humidity will increase the humidity in the dryer house through the water vapor content in the air that enters through the air ducts
Pengujian Rumah Pengering Daun Kelor dengan Efek Rumah Kaca (Solar Dryer) Melalui Variasi Kecepatan Udara Verdy Ariyanto Koehuana; Kristianus Yosafat Goab; Muhamad Jafri
JMPM (Jurnal Material dan Proses Manufaktur) Vol 5, No 2 (2021): December
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v5i2.13899

Abstract

Proses pengeringan menggunakan pengering surya ultraviolet berupa pengering efek rumah kaca memiliki biaya operasional yang relatif rendah, sehingga berpotensi untuk dikembangkan dalam teknologi pengeringan pangan. Penelitian ini bertujuan untuk menguji parameter kinetik pengering daun kelor melalui variasi kecepatan udara keluar dari rumah pengering. Berat daun kelor yang akan dikeringkan dibagi rata ke dalam tiga rak pengering di rumah pengering dengan beban pengeringan yang sama yaitu 4,76 kg/m2. Hasil penelitian menunjukkan bahwa dengan variasi kecepatan keluar yaitu 0,5 m/s, 1,0 m/s, dan 1,36 m/s kekurangan energi panas yang cukup untuk mengubah mekanisme perpindahan panas konveksi pada pengering menjadi konveksi paksa. Sedangkan efisiensi pengeringan meningkat dengan bertambahnya kecepatan aliran keluar, karena kondisi saluran masuk yang tidak diatur sehingga aliran udara masuk yang membawa uap air (terutama saat mendung) meningkatkan kelembaban udara di dalam pengering. perumahan termasuk kadar air bahan dan secara bersamaan mengurangi laju pengeringan dan efisiensi rumah pengering.The drying process using an ultraviolet solar dryer in the form of a greenhouse effect dryer has relatively low operating costs, so it has the potential to be developed in food drying technology. This study aims to test the kinetic parameters of the Moringa leaf dryer through variations in air velocity leaving the dryer house. The weight of the Moringa leaves to be dried is divided evenly into three drying racks in the drying house with the same drying load, which is 4.76 kg/m2. The results showed that with variations in the exit velocity, namely 0.5 m/s, 1.0 m/s, and 1.36 m/s, they lacked sufficient thermal energy to change the convection heat transfer mechanism in the dryer into forced convection. While the drying efficiency increases with the increase in the velocity of the outflow, due to the condition of the inlet that is not regulated so that the inlet airflow carrying water vapor (especially when it is cloudy) increases the humidity of the air in the dryer housing including the moisture content of the material and simultaneously reduces the drying rate and efficiency of the dryer housing.
PENGARUH RASIO DIAMETER SEBAGAI PARAMETER KINERJA AERODINAMIKA DUAL ROTOR COUNTER-ROTATING WIND TURBINE Setiadi Wira Buana; Verdy A Koehuan; A. Riszal; Samsul Kamal; Sugiyono Sugiyono
Prosiding Semnastek PROSIDING SEMNASTEK 2016
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penggunaan energi alternatif yang ramah lingkungan (Green Energy) merupakan topik utama yang mulai banyak dibahas dewasa ini. Salah satu sumber energi terbarukan yaitu energi angin (turbin angin). Seiring dengan perkembangan teknologi, maka dikembangkan Counter Rotating Wind Turbine (CRWT). CRWT merupakan turbin angin dengan poros horisontal terdiri dari dua buah rotor yang putaran rotor saling berlawanan arah. Efisiensi konversi energi turbin angin dual rotor ini secara teoritis lebih baik dari pada rotor tunggal. Pada penelitian ini difokuskan pada CRWT dengan tipe propeler tiga blade menggunakan airfoil S826. Tujuan penelitian adalah untuk menganalisis melalui desain dan analisis rotor turbin (kajian rotor turbin) yang terdapat pada CRWT terutama pengaruh rasio diameter (D) antara rotor depan (D1) dan rotor belakang terhadap performa dari CRWT, dengan permodelan menggunakan program GAMBIT dan solver simulasi menggunakan program FLUENT CFD ANSYS.Hasil dari penelitian ini menunjukkan bahwa variasi yang dilakukan pada rasio diameter rotor memberikan pengaruh terhadap performance aerodinamika dari CRWT. Penggunaan rasio diameter D1/D2 = 1 menghasilkan torsi yang terbaik, sehingga daya dan efisiensi turbin juga semakin baik atau meningkat.Kata kunci: diameter rotor, dual rotor counter-rotating wind turbine, performance wind turbine
Pelatihan Perawatan Pompa Hidram untuk Kelompok Tani Utama Di Daerah Baumata Wenseslaus Bunganaen; Muhamad Jafri; Verdy A Koehuan; Isak S Limbong; Yeremias M Pell; Kristomus Boimau
at-tamkin: Jurnal Pengabdian kepada Masyarakat Vol. 3 No. 2 (2020): At-Tamkin - Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Islam Raden Rahmat Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33379/attamkin.v3i2.553

Abstract

Dry land agriculture is a crop cultivation activity carried out in moderate to severe drought conditions during most of the growing season. As a result, special cultivation techniques, types of crops and farming systems are needed to enable sustainable production. The partner involved in the Program Kemitraan Masyarakat (PKM) is a farmer group called the main farmer group. The main farmer group is located in Baumata village, Taebenu sub-district, Kupang district. This farmer group has used appropriate technology in the form of a hydram pump. The Hydram Pump, which is located in Baumata village is a product of the LP2M through the Mechanical Engineering Study Program, Faculty of Science and Engineering in 2018and is still running and is still being used by farmer groups. Based on the survey and coordination of the implementation team to the location until December 2019, it was concluded that there was a need for field activities in the context of training activities for members of farmer groups on how to repair, maintain and deal with pump problems which decrease productivity and aspects of pump work functions accordingly with a description of the report of the members of the Farmer Group.
Studi Eksperimen Tungku Biomassa pada Proses Pengeringan Chip Umbi Porang melalui Rumah Plastik Ultra-Violet (Solar Dryer) Sistem Hibrid Verdy A. Koehuan; Eflinda Milo; Defmit B. N. Riwu
ROTASI Vol 24, No 4 (2022): VOLUME 24, NOMOR 4, OKTOBER 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.4.57-64

Abstract

This study aims to determine the performance of a biomass stove with coconut shell biomass as fuel for the drying process in a hybrid system dryer house. The method used is an experimental method by testing and analyzing the efficiency of the biomass furnace and the efficiency of the drying house on the variation of the initial mass of coconut shells in the gasification chamber. The test results show that the furnace efficiency or the highest gasification efficiency occurs in combustion with an initial mass of 15 kg of coconut shell, which is 6.18%. Meanwhile, the initial mass of 12 kg and 18 kg showed furnace efficiency of 4.07% and 4.66%, respectively. The efficiency of this biomass furnace is still low, because of the pyrolysis process, which takes place at a relatively low temperature with relatively slow combustion. In the process of drying porang tuber chips through an ultra-violet plastic housing (solar dryer) this hybrid system showed a drying efficiency of 9.58% and a drying house efficiency of 30.02%. The use of biomass heat energy is 9.96%, while the largest heat energy comes from solar radiation into the drying house of 89.11%.
Studi eksperimen rumah pengering ultra-violet (solar dryer) sistem hibrid tungku biomassa melalui variasi kecepatan aliran udara panas Verdy A. Koehuan; Margaretha Kewa Unarajan; Defmit B.N. Riwu; Muhamad Jafri
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol 4 No 1 (2023): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v4i1.3296

Abstract

The ultra-violet dryer integrated with the biomass furnace is a drying method with a forced mechanism. In this study, an experimental study was carried out. The drying process of porang tubers uses a hybrid system ultra violet plastic dryer (UV solar dryer) through varying the speed of the inlet air to obtain efficient drying results and porang tuber products. The results showed that the final moisture content of porang tubers after drying per day for each variation of air speed obtained the lowest value of 10.50%bb with the highest drying rate of 0.3373 kg/hour from the assumption of an initial moisture content of 70%bb, which occurs in variations airspeed of 1.8 m/s. while the speed is 1.3 m/s with the lowest drying rate of 0.330 kg/hour with a final moisture content of 11.74%.bb) Drying efficiency for variations in the speed of hot air flow into the hot air duct of the biomass furnace shows the highest value at a speed of 1.3 m/s of 16.76% with the lowest specific energy consumption (KES) of 51975.7 kJ/kg.
Co-Authors A. Riszal Agustinus Sampealo Aloysius V.P. Piamat Buana, Setiadi Wira Defmit B.N. Riwu Domi K. Dipa Dominggus Godlief Heryson Adoe Eflinda Milo Fransiskus L. H. Koten Fredrikus M. Bere Gusnawati Gusnawati Ishak Limbong Jahirwan Ut Jasron Jani F Mandala, Jani F Joy Ferdinand Ludji Kristianus Yosafat Goab Kristomus Boimau Laurensius Longo Sogen Laurensius Nogur Laurensius Nogur Margaretha Kewa Unarajan Matheus M. Dwinanto Muhamad Jafri Nurhayati Nurhayati Nurhayati Nurhayati Nurhayati Nurhayati Phillips G. Taka Logo Riky Yonerto Runesi Sam Budi Samsul Kamal Sugiyono Sugiyono Thomas J. Hudin Wenseslaus Bunganaen Yeremias M. Pell Yoseph P. Ndeo