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All Journal Jurnal Teknologi Reaktor Nuklir Tri Dasa Mega Jurnal Sains dan Teknologi Semesta Teknika Forum Geografi ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika JMPM (Jurnal Material dan Proses Manufaktur) Jurnal AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Jurnal Edukasi dan Pengabdian kepada Masyarakat (JEPKM) Journal of Mathematics and Applied Statistics
Giarno Giarno
PTKRN - BATAN
Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Other

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SUITABLE PROPORTION SAMPLE OF HOLDOUT VALIDATION FOR SPATIAL RAINFALL INTERPOLATION IN SURROUNDING THE MAKASSAR STRAIT Giarno, Giarno; Hadi, Muhammad Pramono; Suprayogi, Slamet; Murti, Sigit Heru
Forum Geografi Vol 33, No 2 (2019): December 2019
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v33i2.8351

Abstract

Spatial rainfall interpolation requires a number of suitable validation samples to maintain accuracy. Generally, the larger the areas which can be predicted, the better the interpolation. In addition, the data used for validation should be separated from the modelling data. Moreover, the number of samples determine optimally proportion the independent sites. The objective of this study is to determine the optimal sample ratio for holdout validation in interpolation methods; the Makassar Strait was chosen as the study location because of its daily rainfall variation. The accuracy of the sample selection is tested using correlation, root mean square error (RMSE), mean absolute error (MAE) and the indicators of contingency tables. The results show that accuracy depends on the ratio of the modelling data. Therefore, the more extensive the data used for interpolation, the better the accuracy. Otherwise, if the rain gauge data is separated according to province, there will be a variation in accuracy in the portion of independent samples. For rainfall interpolation, it is recommended to use a minimum 75% of data sites to maintain accuracy. Comparison between kriging and inverse distance weighting or IDW methods indicates that IDW is better. Moreover, rainfall characteristics affect the accuracy and portion of the independent sample.
KARAKTERISASI PROTOTIPE HEATER ELEMENT SYSTEM PADA UNTAI UJI RCCS-RDNK MENGGUNAKAN KAMERA INFRA MERAH HARYANTO, DEDY; GIARNO, GIARNO; WITOKO, JOKO PRASETIO; KUSNUGROHO, GREGORIUS BAMBANG HERU; KUSUMASTUTI, RAHAYU; JUARSA, MULYA
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 8, No 2 (2020): ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektro
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v8i2.313

Abstract

ABSTRAKReactor Cavity Cooling System (RCCS) adalah salah satu sistem keselamatan pada Reaktor Daya Non Komersial (RDNK). Untuk mensimulasikan keadaaan tersebut, dibuat prototype Heater Element System (HES) yang merupakan sistem pemanas listrik dan berfungsi untuk memberikan kalor pada simulator dinding RPV (wall) seperti pada acuan RPV tipe HTGR. Tujuan penelitian adalah untuk memperoleh karakteristik temperatur selama pemanasan prototype HES hingga mencapai temperature 400°C berdasarkan posisi vertikal dan horizontal HES. Metode pengamatan dilakukan dengan menggunakan kamera infra merah NEC tipe TH9100ML sebagai alat ukur temperatur dan alat visualisasi ditribusi temperatur. Hasil pengamatan menunjukkan, bahwa kehilangan kalor pada prototipe HES pada posisi vertikal lebih kecil dibandingankan pada posisi horizontal hal ini disebabkan karena luas permukaan pada posisi horizontal sebesar 7,260 cm2 lebih memungkinkan untuk kehilangan kalor lebih besar. Posisi vertikal temperatur yang dicapai pada wall prototipe HES lebih tinggi dibandingkan pada posisi horizontal.Kata Kunci: RCCS, Heater Element System, kamera infra merah, temperatur ABSTRACTReactor Cavity Cooling System (RCCS) is one of the safety systems in Non-Commercial Power Reactors (RDNK). To simulate this situation, a prototype Heater Element System (HES) was made using electric heating system as a heat sources and it serves to provide radiation heat to the RPV wall simulator as the reference of the RPV of HTGR type. The purpose of this study was to obtain the temperature characteristics during the heating of the HES prototype to reach temperatures of 400°C base on HES position, horizontal and vertical positions. The observation method was carried out using a TH9100ML infrared camera NEC type as a temperature measurement and a temperature distribution base on visualization. The observations show that the heat loss in the HES prototype in the vertical position is smaller than in the horizontal position because this is because the surface area in the horizontal position 7.260 cm2 is more likely to lose more heat. The vertical position the temperature achieved on the HES prototype wall is higher than in the horizontal position.Keywords: RCCS, Heater Element System, infrared camera, temperature
Karakteristik Perubahan Temperatur Bagian Pendingin Selama Sirkulasi Alam untuk Kondisi Tunak pada Untai Uji FASSIP-02 A.R, Esa Putra; Giarno, Giarno; P, Adhika Enggar; K, G.B. Heru; A.A, Andrea Shevaladze; Juarsa, Mulya
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.v5i2.14064

Abstract

Tangki pendingin merupakan salah satu bagian dari fasilitas FASSIP-02 Test Loop Strand yang merupakan sistem pendingin untuk melepaskan panas ke lingkungan. Fasilitas eksperimental skala besar FASSIP-02 Test Loop Strand dibangun untuk pengembangan sistem keamanan berbasis pendinginan pasif yang memanfaatkan aliran sirkulasi alami. Salah satu hal yang menarik untuk dibahas adalah proses pemanasan, tunak, dan pendinginan yang terjadi pada bagian pendinginan selama percobaan. Tujuan dari penelitian ini adalah untuk mendapatkan karakteristik historis dari perubahan suhu selama proses transien pemanasan, keadaan tunak, dan transien pendinginan di bagian pendinginan. Metode penelitian dilakukan secara eksperimental dengan perubahan kondisi awal setting temperatur air pada bagian pemanasan bervariasi dari 40 0C, 50 0C dan 60 0C. Semua pengukuran dilakukan selama 24 jam menggunakan sistem akuisisi data instrumentasi nasional dengan sampling rate 1 data per detik. Percobaan dilakukan dengan cara memanaskan suhu air di dalam heater sampai mencapai setting suhu yang ditentukan, kemudian mempertahankan suhu pada keadaan tunak selama 5 jam. Selanjutnya, daya listrik ke pemanas dimatikan dan sistem dibiarkan dingin secara alami saat merekam data. Hasil yang diperoleh setelah data percobaan diolah dengan program grafik Orgin 8, dimana diperoleh waktu yang diperlukan untuk mencapai kondisi tunak pada berbagai temperatur 40 0C, 50 0C dan 60 0C adalah 1291 detik, 2392 detik dan 3504 detik, masing-masing. Perubahan temperatur antara inlet dan outlet pada cooler berturut-turut adalah 5,43 0C, 9,67 0C dan 12,62 0C.   ABSTRACT The cooling tank is one part of the FASSIP-02 Test Loop Strand facility which is a cooling system to release heat to the environment. The FASSIP-02 Test Loop Strand large-scale experimental facility was built for the development of passive cooling based safety systems utilizing natural circulating flows. One of the interesting things to discuss is the heating, steady and cooling proCesses that occur in the cooling section during the experiment. The aim of the study was to obtain historical characteristics of temperature changes during the heating transient proCess, steady state and cooling transients in the cooling section. The research method was carried out experimentally with changes in the initial conditions of setting water temperature in the heating section variation from 40 0C, 50 0C and 60 0C. All measurements were carried out for 24 hours using the national instrumensasit data acquisition system with a sampling rate of 1 data per second. The experiment was carried out by heating the water temperature in the heater until it reached the specified temperature setting, then maintaining the temperature at steady state for 5 hours. Next, the electrical power to the heater is turned off and the system is allowed to cool naturally while recording data. The results obtained after the experimental data were proCessed with the Orgin 8 graph program, where it was obtained that the time required to reach steady conditions at various temperatures of 40 0C, 50 0C and 60 0C were 1291 seconds, 2392 seconds and 3504 seconds, respectively. Changes in temperature between the inlet and outlet in the cooler are 5.43 0C, 9.67 0C and 12.62 0C, respectively.
Edukasi Petani Dalam Memanfaatkan Informasi dan Prakiraan Iklim/Musim Melalui Sekolah Lapang Iklim di Tegalsari, Kedu, Temanggung Ruslana , Zauyik Nana; Umaroh, Umaroh; Giarno, Giarno
Jurnal Edukasi dan Pengabdian kepada Masyarakat Vol. 1 No. 2 (2022): Desember 2022
Publisher : Yayasan Insan Literasi Cendekia (INLIC) Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35914/jepkm.v1i2.7

Abstract

Potensi pertanian yang besar di Karesidenan Kedu terkendala oleh kesadaran dan pemahaman unsur cuaca iklim yang kurang tepat. Salah satu metode untuk meningkatkan pengetahuan dan kemampuan petani adalah Sekolah Lapang Iklim (SLI). Kegiatan SLI tahap 3 (SLI 3) merupakan eduksi secara langsung untuk meningkatkan kemampuan petani dalam merencanakan kegiatan usaha tani dengan memanfaatkan pengetahuan tentang cauca dan iklim. Hasil kegiatan SLI 3 ini terlihat dari hasil pre-Test dan post-test dimana nilai rata-rata pemahaman materi SLI pre test 56.8% benar dibandingkan 81.2% setelah kegiatan atau post test. Selain itu petani langsung menerapkan pengetahuan cara menghitung hasil panen padi. Diperoleh panen padi terendah sebesar 6.2 Ton/Ha dan tertinggi sebesar 7.8 Ton/Ha dengan rata-rata produktivitas adalah 6.8 Ton/Ha. Mengingat di masa tanam ini terjadi serangan hama lebih banyak dibandingkan dengan waktu tanam Tahun 2018, hasil produktivitas pada Sekolah Lapang Iklim BMKG masih lebih tinggi dari rata-rata Kabupaten sebesar 6.2 Ton/Ha dengan kenaikan produksi 9.7%.
Edukasi Petani Jogoyasan, Ngablak, Magelang dalam Memanfaatkan Informasi Iklim/Musim untuk Meningkatkan Hasil Panen Tomat Amalina, Hana; Sulistyowati, Sulistyowati; Giarno, Giarno
Jurnal Edukasi dan Pengabdian kepada Masyarakat Vol. 1 No. 1 (2022): Juni 2022
Publisher : Yayasan Insan Literasi Cendekia (INLIC) Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35914/jepkm.v1i1.8

Abstract

Informasi iklim sangat penting dalam bidang pertanian. Banyaknya disinformasi informasi ini dapat diminimalkan dengan kegiatan edukasi pengetahuan iklim dan keterkaitannya dengan pertanian kepada para petani. Sekolah Lapang Iklim (SLI) merupakan salah satu upaya dalam memahami informasi cuaca dan iklim untuk memberdayakan petani dalam memahami dan memanfaatkan informasi prakiraan iklim secara efektif dalam kegiatan pertanian. Wilayah Magelang merupakan sentra holtikultura yang penting di Jawa Tengah, dimana salah satu komoditasnya adalah tanaman tomat yang permintaannya selalu meningkat. Hasilnya kegiatan SLI, selain meningkatkan pengetahuan pemahaman informasi iklim sebenar 20%, kegiatan ini juga berdampak pada meningkatnya hasil panen. Hasil panen tanaman tomat di desa Jogoyasan meningkat hingga 50% dimana mencapai 3-4 kg/pohon dengan kualitas baik lebih tinggi pada lahan yang diperlakukan menurut ilmu yang diperoleh di sekolah lapang iklim (SLI), dibandingkan dengan hasil lahan non SLI 2-3 kg/pohon.
Thermal Resistance of the Loop Heat Pipe Prototype in Steady State Conditions Haryanto, Dedy; Giarno, Giarno; Hatmoko, Sumantri; Pambudi, Yoyok Dwi Setyo; Kusuma, M. Hadi
Semesta Teknika Vol 26, No 2 (2023): NOVEMBER
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i2.18788

Abstract

The nuclear accident at the Fukushima Daiichi nuclear power plant in March 2011 in Japan caused a tsunami and submerged the emergency diesel generator resulting in a station blackout (SBO). Based on the accident, a study was conducted on the use of passive safety systems as a support for active safety systems in nuclear reactor cooling systems. The Loop Heat Pipe (LHP) prototype is a small-scale LHP research facility, one of which is used to determine the characteristics and heat transfer events in LHP. Calculations to determine the thermal resistance of the LHP prototype need to be carried out to determine its performance level. The research was carried out experimentally for data collection followed by calculations based on the data that had been obtained. The calculation results obtained that the lowest thermal resistance is 0.014 °C/w with a 100% filling ratio and an airflow velocity of 2.5 m/s, so the setting of filling ratio and airflow velocity produces the best LHP prototype performance. The higher the airspeed, the greater the heat released by the condenser resulting in the value of the thermal resistance of the LHP prototype getting smaller. Thus, the greater the airspeed, the lower the thermal resistance of the LHP prototype, this indicates that the performance of the LHP prototype is increasing.
Perbandingan Standardized Precipitation Index dan Standardized Anomaly Index untuk Penentuan Tingkat Kekeringan di Kabupaten Sragen, Jawa Tengah Ramdhani, Muhammad Zaki; Arifianto, Fendy; Giarno, Giarno
Semesta Teknika Vol 26, No 1 (2023): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i1.16310

Abstract

Kekeringan adalah suatu peristiwa dimana terjadinya penurunan intensitas curah hujan dan mengakibatkan krisis air untuk menunjang kebutuhan sehari hari manusia. Kasus kekeringan selalu terjadi setiap tahun di Jawa Tengah dengan berbagai macam dampak yang ditimbulkan. Tujuan dari penelitian ini adalah untuk mengetahui perbedaan pada indeks kekeringan yang digunakan, yaitu indeks kekeringan Standardized Precipitation Index (SPI) dan indeks kekeringan Standardized Anomaly Index (SAI). Penelitian ini dilakukan dengan menggunakan metode analisa secara spasial menggunakan metode perhitungan indeks kekeringan SPI dan SAI. Hasil yang diperoleh yaitu pada perhitungan menggunakan rumus SPI maupun SAI untuk menentukan tingkat kekeringan di Kabupaten Sragen periode 2011-2020 memiliki kesamaan pola sebesar 89% untuk tahun kering dan tahun basah. Selain itu, kasus kekeringan di Kabupaten Sragen untuk setiap tahunnya di dominasi oleh kategori normal. Tahun kekeringan terjadi pada tahun 2012, 2015, 2018 dengan kasus kekeringan sedang, tahun 2014 dan tahun 2019 dengan kasus kekeringan parah.  
Computational Fluid Dynamics Simulation of Temperature Distribution and Flow Characterization in a New Loop Heat Pipe Model Restiawan, Muhammad Mika Ramadhani; Kusuma, Mukhsinun Hadi; Rozi, Khoiri; Kiono, Berkah Fajar Tamtomo; Yunus, Muhammad; Wirza, Alif Rahman; Pambudi, Yoyok Dwi Setyo; ButarButar, Sofia Loren; Giarno, Giarno; Hatmoko, Sumantri
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 26, No 2 (2024): June 2024
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/tdm.2024.7054

Abstract

The loop heat pipe (LHP) is considered for passive cooling systems in nuclear installations. A combined approach of simulation and experimentation is essential for achieving comprehensive knowledge of the LHP. Research on the LHP using Computational Fluid Dynamics (CFD) is necessary to understand phenomena that are challenging to ascertain experimentally. This study investigates the temperature distribution and flow characterization in a new LHP model. The method used in this research is simulation using CFD Ansys fluent software. In the simulation, the LHP has an inner diameter of 0.1016 m. This LHP features a wick made from a collection of capillary pipes without a compensation chamber. Demineralized water is used as the working fluid with a filling ratio of 100% of evaporator volume. The hot water temperature in the evaporator section is set at 70°C, 80°C, and 90°C. The temperature on the outer surface of the condenser pipe is determined using experimental temperature inputs. An inclination angle of 5° and an initial pressure of 12,100 Pa was applied to LHP. The CFD simulation results show that the temperature distribution profile under steady-state conditions in the  loop heat pipe appears almost uniform. The temperature difference between the evaporator and condenser remains consistent. The flow of working fluid in the LHP is driven by buoyancy forces and fluid flow, allowing the working fluid in the LHP to flow in two phases from the evaporator to the condenser and then condensate from the condenser back to the evaporator. In conclusion, the temperature distribution and flow patterns in the LHP are consistent with common phenomena observed in heat pipes. This modeling can be used to determine the profiles of temperature distribution and flow in LHP of the same dimensions under various thermal conditions.
Experimental Study of The Influences of Inclination Angle and Heat Load on Loop Heat Pipe Thermal Performance Pramesywari, Afifa; Kusuma, Mukhsinun Hadi; Kiono, Berkah Fajar Tamtomo; Rozi, Khoiri; Giarno, Giarno; Pambudi, Yoyok Dwi Setyo; Hatmoko, Sumantri; Emara, Haura
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 26, No 2 (2024): June 2024
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/tdm.2024.7013

Abstract

The utilization of nuclear power brings out a lot of benefits in fulfilling human power needs, however, the thermal incident caused by the failure of an active cooling system because of an earthquake followed by the tsunami such as on the Nuclear Power Plant at Fukushima Dai-Ichi Japan could be taken for lesson learn to keep improve nuclear installation operation safety aspects. Loop heat pipe (LHP) as an alternative cooling system technology could be utilized to handle thermal problems on nuclear installations. This research aims to know the influence of the inclination angle and heat load on the LHP thermal performance. The experimental investigation was performed with varying the inclination angle of 0°, 2.5°, and 5°, and heat load given at 60°C, 70°C, 80°C, and 90°C. LHP was used demineralized water working fluid with a 100% filling ratio. LHP was vacuumed on 2.666,4 Pa. The cooling air velocity in the condenser given by 2,5 m/s. The result of this experiment showed that LHP has the best thermal performance with the lowest thermal resistance of 0.0043°C/W. This result was obtained when the LHP operated with a 5° inclination angle and hot water as the heat load of 90°C. The conclusion from this research is showing better LHP thermal performance as the inclination angle increase on LHP because the steam speed that formed bigger, and condensate flows back to the evaporator faster
Experimental Investigation of Natural Circulation Stability Phenomena in a New Loop Heat Pipe Model Wirza, Alif Rahman; Kusuma, Mukhsinun Hadi; Rozi, Khoiri; Kiono, Berkah Fajar Tamtomo; Restiawan, Muhammad Mika Ramadhani; Giarno, Giarno; Pambudi, Yoyok Dwi Setyo; Yunus, Muhammad; ButarButar, Sofia Loren; Hatmoko, Sumantri; Apriandi, Nanang; Pramesywari, Afifa
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 26, No 2 (2024): June 2024
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/tdm.2024.7053

Abstract

The severe accident at the Fukushima Dai-ichi Nuclear Power Plant in Japan in 2011 highlighted the critical need for a passive cooling system to dissipate residual decay heat following the failure of active cooling systems in the nuclear facility. The loop heat pipe (LHP) is a promising technology for such applications. The objective of this research is to understand the natural circulation stability phenomena of new LHP model under varying conditions of filling ratio and heat load. The experimental methodology employed a laboratory-scale LHP model made of copper with an inner diameter of 0.104 m. The experiments were designed with filling ratios of 20%, 40%, 60%, 80%, and 100%, and hot water temperature as the evaporator heat source with variations of 60°C, 70°C, 80°C, and 90°C. The initial operating pressure was 10665.6 Pa, with a 5˚ inclination angle, demineralized water as the working fluid, and cooled by air at a velocity of 2.5 m/s. The results show that the natural circulation within the LHP occurs in two phases and maintained stability, with optimal performance observed at an 80% filling ratio and 90°C. The conclusion of this research indicates that natural circulation stability in the LHP operates well and occurs in two phases, proving that natural circulation in the LHP is effective in heat dissipation.
Co-Authors A.A, Andrea Shevaladze A.R, Esa Putra Ainur Rosidi, Ainur Amalina, Hana Arifianto, Fendy Berkah Fajar Tamtomo kiono Dedy Haryanto Didiharyono, D. Emara, Haura Fauzi Ahmad Muda Gregorius Bambang Heru Hatmoko, Sumantri Ignatius Djoko Irianto, Ignatius Djoko K, G.B. Heru Khoiri Rozi KUSNUGROHO, GREGORIUS BAMBANG HERU Kusuma, Mukhsinun Hadi M. Hadi Kusuma Manuhung, Suparman muflihah muflihah Muhammad Pramono Hadi, Muhammad Pramono Muhammad Yunus Mulya Juarsa Nanang Apriandi P, Adhika Enggar Pambudi, Yoyok Dwi Setyo PAMUNGKAS, ADHIKA ENGGAR Pramesywari, Afifa Rahayu Kusumastuti Ramdhani, Muhammad Zaki Restiawan, Muhammad Mika Ramadhani Ruslana , Zauyik Nana Sigit Heru Murti Slamet Suprayogi Sofia Loren Butarbutar, Sofia Loren Sukriming Sapareng Sulistyowati Sulistyowati Umaroh Umaroh, Umaroh Wirza, Alif Rahman WITOKO, JOKO PRASETIO