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All Journal International Journal of Electrical and Computer Engineering Jurnal Energi Dan Manufaktur Jurnal Teknologi Reaktor Nuklir Tri Dasa Mega Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) ARTEKS : Jurnal Teknik Arsitektur Makara Journal of Technology INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Journal of Engineering and Technological Sciences Prosiding SNTTM Scientific Contributions Oil and Gas
Nandy Setiadi Djaya Putra
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics

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ANALISA PENGARUH SUHU AWAL PELAT PANAS PADA PROSES QUENCHING CELAH SEMPIT REKTANGULAR M. Hadi Kusuma; Mulya Juarsa; Anhar Riza Antariksawan; Nandy Putra
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 14, No 2 (2012): Juni 2012
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

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Abstract

Pemahaman terhadap manajemen termal apabila terjadi suatu kecelakaan parah reaktor nuklir seperti melelehnya bahan bakar dan teras reaktor, menjadi prioritas utama untuk menjaga integritas bejana tekan reaktor. Dengan demikian hasil lelehan bahan bakar dan teras reaktor (debris) tidak keluar dari bejana tekan reaktor dan mengakibatkan dampak lain yang lebih besar ke lingkungan. Salah satu cara yang dilakukan untuk menjaga integritas bejana tekan reaktor adalah dengan melakukan pendinginan terhadap panas berlebih yang dihasilkan akibat dari kecelakaan tersebut. Untuk mempelajari dan mendapatkan pemahaman mengenai hal tersebut, maka dilakukan penelitian mengenai pengaruh suhu awal pelat panas dalam proses quenching (pendinginan secara tiba-tiba) celah sempit rektangular. Penelitian difokuskan pada penentuan suhu rewetting dari pendinginan pelat panas dengan suhu awal pelat 220 0C, 400 0C, dan 600 0C dengan laju aliran air pendingin 0,2 liter/detik. Eksperimen dilakukan dengan menginjeksikan air pada laju aliran 0,2 liter/detik pada suhu air pendingin 85 0C ke dalam celah sempit rektangular. Data hasil pengukuran digunakan untuk mengetahui suhu rewetting yang terjadi pada pendinginan pelat panas tersebut. Tujuannya adalah untuk memahami pengaruh suhu awal pelat panas terhadap rewetting pada proses quenching di celah sempit rektangular. Hasil yang diperoleh menunjukkan bahwa titik rewetting pada pendinginan pelat panas 220 0C, 400 0C, dan 600 0C terjadi pada suhu rewetting yang berbeda-beda. Pada suhu awal pelat panas 220 0C, suhu rewetting terjadi pada 220 0C yaitu langsung ketika air dilewatkan melalui celah sempit rektangular. Pada suhu awal pelat panas 400 0C, suhu rewetting terjadi pada 379,51 0C. Dan pada suhu awal pelat panas 600 0C, suhu rewetting terjadi pada 426,63 0C. Perbedaan suhu awal pelat panas yang sangat signifikan menyebabkan terjadinya perubahan sifat fisik benda uji, berbedanya rejim pendidihan yang dialami oleh fluida yang melewati celah sempit, perubahan nilai kalor spesifik bahan, perubahan nilai konduktifitas termal, dan perbedaan suhu wall superheated-nya. Perubahan-perubahan yang terjadi tersebut menyebabkan peningkatan suhu rewetting seiring dengan kenaikan suhu awal pelat panas.Kata kunci: rewetting, quenching, celah sempit, keselamatan nuklir The understanding about thermal management in the event of a severe accident such as the melting nuclear reactor fuel and reactor core, became a priority to maintain the integrity of reactor pressure vessel. Thus the debris will not out from the reactor pressure vessel and resulting impact of more substantial to the environment. One way to maintain the integrity of the reactor pressure vessel was cooling of the excess heat generated due to the accident. Toget understanding of this aspect, the research focused on the effect of the initial temperature of the hot plate in the rectangular narrow gap quenching process. The initial temperature effect on quenching process is related to cooling process (thermal management) when the occurrence of a nuclear accident due to loss of coolant accident or severe accident. In order to address the problem, it is crucial to conduct research to get a better understanding of thermal management regarding to nuclear cooling accident. The research focused on determining the rewetting temperature of hot plate cooling on 220 0C, 400 0C, and 600 0C with 0.2 liters/sec cooling water flowrate. Experiments were carried out by injecting 85 0C cooling water temperature into the narrow gap at flowrates of 0.2 liters/sec. Data of transient temperature measurements were recorded using a data acquisition system in order to know the rewetting temperature during the quenching process. This study aims to understand the effect of hot plate intial temperature on rewetting during rectangular narrow gap quenching process. The results obtained show that the rewetting point on cooling the hot plate 220 0C, 400 0C and 600 0C occurs at varying rewetting temperatures. At 220 0C hot plate initial temperature, the rewetting temperature occurs on 220 0C. At 400 0C hot plate initial temperature, the rewetting temperature occurs on 379.51 0C. At 600 0C hot plate initial temperature, the rewetting temperature occurs on 426.63 0C. Significant differences of hot plate initial temperature leads to changes in physical properties of material, different boiling regimes occurs when fluid passing through a narrow gap, changes on specific heat of material, changes on thermal conductivity of material, and the differences of wall superheated temperature. Rewetting temperature will increase due to increasing on hot plate initial temperature. Keywords: rewetting, quenching, narrow gap, nuclear safety
PERHITUNGAN FLUKS KALOR UNTUK KURVA DIDIH SELAMA EKSPERIMEN QUENCHING MENGGUNAKAN SILINDER BERONGGA DIPANASKAN Mulya Juarsa; Raldi Artono Koestor; Nandy Setiadi Djaya Putra; Anhar Riza Antariksawan; Cukup Mulyana; Riska Khalisa
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 12, No 3 (2010): Oktober 2010
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

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Abstract

Salah satu aspek penting manajemen keselamatan dalam pengoperasian reaktor nuklir adalah manajemen termal. Konsep dasar pengelolaan termal adalah untuk mengendalikan kelebihan kalor saat terjadinya kecelakaan. Pemahaman dan investigasi fenomena pendidihan selama kecelakaan yang terjadi secara transien menjadi tahapan penelitian yang penting. Proses quenching adalah proses pendinginan tiba-tiba pada obyek yang panas dengan memasukkan ke dalam suatu fluida. Material SS316 dengan geometri silinder berongga pada posisi vertikal merupakan simulasi dari debris dan digunakan sebagai objek yang dipanaskan. Metode eksperimen dilakukan melalui pendinginan quenching secara alami pada silinder berongga dengan berbagai variasi temperatur awal dari 300 oC sampai 800 oC ke dalam temperatur saturasi air. Selama eksperimen data temperatur direkam dan visualisasi pendidihan dilakukan melalui kamera kecepatan tinggi (HSC). Hasil data transien temperatur digunakan untuk menghitung fluks kalor. Rejim didih film pada TC8 (bagian terluar) dalam kurva didih untuk semua temperatur awal menunjukkan kesesuaian dengan korelasi Bromley. Proses didih film paling singkat terjadi selama 1,11 detik untuk temperatur awal 300 oC. Fluks kalor kritis pada TC8 untuk temperatur awal dari 800 oC, 600 oC, 400 oC dan 300 oC secara berturutturut adalah 700 kW/m2, 500 kW/m2, 450 kW/m2 dan 400 kW/m2.Kata kunci: quenching, silinder, pendidihan, fluks kalor One of the safety management aspects in the operation of nuclear reactors is thermal management. The basic concept of thermal management is to control the excess heat during an accident. The understanding and investigation of boiling phenomenon become important research stage. Quenching process is the process of sudden cooling on a hot object by entering into a fluid. SS316 material with hollow cylinder geometry in a vertical position is the simulation of debris and used as a heated object. Method of quenching experiments carried out through the natural cooling of the hollow cylinder with different variations of initial temperature from 300 oC to 800 oC and submerged into the water with saturation temperature. Temperature data was recorded and boiling was captured using highspeed camera (HSC) during the experiment. The results of transient temperature data was used to calculate the heat flux. The film boiling regime on TC8 (outer portion) in the boiling curves for all initial temperatures have a good agreement with Bromley’s correlation. The shortest process of film boiling was occurred for 1.11 seconds at the initial temperature of 300oC. Critical heat flux at TC8 from initial temperature of 800 oC, 600 oC, 400 oC and 300 oC in respectively is 700 kW/m2, 500 kW/m2, 450 kW/m2 and 400 kW/m2. Keywords: quenching, cylinder, boiling, heat flux
SIMULATION OF OPERATIONAL CONDITIONS OF FASSIP-02 NATURAL CIRCULATION COOLING SYSTEM EXPERIMENTAL LOOP Dr.Anhar Riza Antariksawan; Surip Widodo; Mulya Juarsa; Dedy Haryanto; Mukhsinun Hadi Kusuma; Nandy Putra
Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) Vol 19, No 1 (2018): Februari 2018
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (490.664 KB) | DOI: 10.17146/jstni.2018.19.1.4036

Abstract

The natural circulation is considered in the design of emergency passive core cooling system in a nuclear power plant. In that context, in order to investigate the characteristics of the natural circulation, FASSIP-02 experimental loop is designed. This paper simulates the various operational conditions with different condition of the heater power, the pipe insulation and the expansion tank's valve using RELAP5 code. The objective is to obtain the best operational conditions of FASSIP-02 once it is built. The simulation results show that the until 50,000 s the steady state condition could not be achieved yet when the heater power greater than 10 kW. The pipe insulation reduced the heat loss to the environment and in turn it causes faster increase of the water temperature inside the pipe. While, if the expansion tank's valve is closed during the operation, the pressure inside the loop would increase, faster when the heater power is higher. It is concluded that in all cases to avoid the saturation condition, the heater power should be maintained lower than 10 kW, especially when the loop pipe is insulated.
Pengukuran Fluks Kalor Prosessor dengan Metode Simulasi Fluks Kalor Plat Datar Wayan Nata Septiadi; Nandy Putra; Engkos K; Raldi Artono Koestoer
Jurnal Energi Dan Manufaktur Vol 7 No 2 (2014): Oktober 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Metode pengukuran dalam suatu penelitian di bidang perpindahan kalor khususnya pipakalor merupakan suatu hal yang sangat penting untuk bisa mendapatkan suatu data yangmemang akurat. Penelitian ini adalah untuk mendapatkan kondisi temperatur dan flukskalor pada permukaan plat pemanas yang mampu mewakili kondisi temperature dan flukskalor pada permukaan prosessor atau CPU. Penelitian ini meliputi tahap uji quasi steadystate, kalibrasi termokopel, pengukuran temperature permukaan CPU, karakterisasi platpemanan dan karakterisasi palt simulator. Dalam hal ini parameter yang dijadikan acuanpada plat simulator adalah temperature permukaan prosessor.Kata kunci: Pengukuran, Fluks kalor, ProsessorMeasurement methods in a research of the heat transfer especially the heat pipe is veryimportant to be able to get a really accurate data. This research is to obtain the conditions oftemperature and heat flux on the surface of the heating plate that capable of representingthe conditions of temperature and heat flux on the surface of the processor or CPU. Thisresearch includes the quasi steady state test phase, thermocouple calibration, CPU surfacetemperature measurement, characterization and characterization of heater plate andsimulator plate. In this case the parameters are used as reference in the simulator plate isthe surface temperature of processor..Keywords: Measurement, heat flux, processor
Aplikasi PCM Bees Wax sebagai teknologi penyimpan energi (thermal energy storage) pada pemanas air domestik Adi Winarta; Muhammad Amin; Nandy Putra
Jurnal Energi Dan Manufaktur Vol 8 No 2 (2015): Oktober 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Sistem pemanas air merupakan salah satu pengguna energi terbesar pada industri perhotelan selain pengkondisian udara dan penerangan. Temperatur air yang dihasilkan pada sistem pemanas air domestik biasanya berkisar antara 55-65°C. Phase Change Material (PCM) sebagai salah satu teknologi thermal storage dapat dimanfaatkan untuk meningkatkan efisiensi penggunaan energi listrik pada sistem pemanas air. PCM memanfaatkan kalor laten untuk menyimpan energi dan melepaskannya pada kondisi yang diinginkan. Pada penelitian ini diuji sebuah sistem pemanas air domestik dengan volume air sebesar 100 liter. Sumber kalor pada pemanas ini menggunakan heater listrik dengan daya total 3000 Watt. Sejumlah PCM diletakkan didalam drum pemanas air sebagai thermal storage dengan tujuan mempertahankan temperatur air pada suhu 60C sehingga penggunaan listrik oleh heater dapat dikurangi. Material PCM menggunakan bahan organik lilin lebah atau bees wax yang memiliki titik leleh 52°C-66°C. Bees wax ditempatkan pada kontainer yang terbuat dari pipa tembaga dengan diameter dalam 38,1 milimeter dan panjang 260 mm. Pengujian dilakukan dengan menguji tiga variasi massa PCM yakni 1,9 kg, 5,1 kg, dan 7,3 kg. Hasil pengujian menyatakan bahwa penggunaan PCM 1,9 kg memiliki waktu penundaan heater yang paling lama yakni 1 jam 6 menit 40 detik. Penggunaan PCM masih memiliki penggunaan daya yang lebih besar dibandingkan tanpa PCM yakni 12,93 kJ pada masa PCM 1,9 kg, 13,88 kJ pada 5,1 kg PCM dan 14,803 kJ pada 7,3 kg masa PCM. Kata kunci: Phase Change Material (PCM), Beewax, Domestic Water Heater.Abstract:Water heating system is one of the largest energy users in the hospitality industry, in addition to the air conditioning and lighting. The temperature of water which is produced on the domestic water heating systems typically range between 55-65°C. Phase Change Material (PCM) as one of the thermal storage technology can be utilized to improve the efficiency of energy use in water heating systems. PCM utilizes latent heat to store energy and release it at the desired conditions.This study tested a domestic water heating system with 100 liters water volume. The heat source in heating is using an electric heater with a total power of 3000 Watts. A number of PCM is placed inside the water heater drum as a thermal storage to maintaining the temperature of the water keep at 60°C, so that the use of electricity by the heater can be reduced. PCM material using organic materials such as bees wax which has a melting point of 52°C - 66°C. Bees wax is placed in containers made of copper pipe with an inner diameter of 38.1 millimeters and a length of 260 mm. Testing is done by testing five variations of the PCM mass 1,9 kg, 5,1 kg, and 7,3 kg. The test results stated, with the latent heat 0,242 kJ/g bees wax is capable to maintaining the temperature of water at 65°C for 116.6 minutes. Keywords: Phase Change Material (PCM), Bees Wax, Pemanas air domestic Keywords : Phase Change Material (PCM), Bees Wax, Pemanas air domestic
Karakterisasi Konduktivitas Termal Nanofluida Oksida Berbasis Fluida Dasar H2O Wayan Nata Septiadi; Nandy Putra; Rosari Saleh
Jurnal Energi Dan Manufaktur Vol 8 No 2 (2015): Oktober 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Sejak nanofluida mulai diperkenalkan untuk peningkatan konduktivitas termal, hal ini memberikan suatu harapan yang besar bagi bidang perpindahan kalor. Penelitian dan pengaplikasian nanofluida terus mengalami perkembangan dan peningkatan. Pendispersian partikel nano ke dalam fluida dasar sehingga membentuk suatu suspense nanofluida tentunya memiliki karakteristik konduktivitas termal yang berbeda beda antara penggunaan nano partikel satu dengan nano partikel lainnya. Penggunaan nano partikel oksida juga mulai banyak digunakan sebagai fluida kerja alternative baik sebagai fluida kerja alat penukar kalor maupun sebagai fluida kerja pada pipa kalor dan teknologi pendingin lainnya. Hal ini menjadi sangat penting untuk mengetahui karakteristik konduktivitas termal nanofluida oksida pada fraksi volume rendah dan fraksi volume tinggi. Penelitian dilakukan dengan mendispersikan partikel nano CuO, Al2O3 dan TiO2 yang masing masing berukuran 20 nm ke dalam fluida dasar air (H2O) dan dilakukan sonifikasi menggunakan ultrasonic prosessor selama 30 menit. Fraksi volume dibuat dalam fraksi volume rendah yakni 0.1% sampai dengan 0.9% dan fraksi volume tinggi 1% sampai dengan 10%. Pengujian konduktivitas termal nanofluida oksida pada fraksi volume rendah dan fraksi volume tinggi dilakukan dengan menggunakan metode KD2 yang diukur pada temperatur 25oC. Hasil pengujian menunjukkan karakterisasi konduktivitas termal nanofluida oksida yang dalam hal ini adalah CuO-Air, Al2O3-Air dan TiO2-Air masing-masing memberikan peningkatan konduktivitas termal yang signifikan pda fraksi volume rendah. Konduktivitas termal CuO-Air baik pada fraksi volume rendah maupun pada fraksi volume tinggi lebih tinggi dibandingkan dengan konduktivitas termal Al2O3-Air dan TiO2-Air. Kata kunci: Konduktivitas termal, nanofluida, oksida, fraksi volume.Abstract:Since nanofluids was introduced to increase the thermal conductivity, it gives great hope for the field of heat transfer. Research and application of nanofluids continues to experience growth and improvement. Dispersing nanoparticles into the base fluid to form a suspense nanofluids certainly has the different characteristics of a thermal conductivity. The use of nano-oxide particles are also widely used as a good alternative working fluid as the working fluid heat exchanger as well as the working fluid in the heat pipes and other cooling technologies. Its very important to know the characteristics of the thermal conductivity of nanofluids oxide at low and high volume fraction. The study was conducted by dispersing nanoscale particles of CuO, Al2O3 and TiO2 are each measuring 20 nm in a base fluid water (H2O) and doing sonification using ultrasonic processor for 30 minutes. Fraction volume created in volume fraction lower at 0.1% to 0.9% and a high volume fraction of 1% to 10%. Thermal conductivity of nanofluids testing oxides at low volume fraction and a high volume fraction KD2 done using a method that is measured at a temperature of 25oC. The test results show the characterization of thermal conductivity of nanofluids oxide in this case is CuO- Water, Al2O3-Water and TiO2-Water each provide a significant increase in thermal conductivity at low volume fraction. The thermal conductivity of CuO-water nanofluid higher at low and high volume fraction than the thermal conductivity of Al2O3-Water and TiO2-Water. Keywords: Thermal conductivity, nanofluids, oxide, volume fraction.
Potency of Thermoelectric Generator for Hybrid Vehicle Putra, Nandy; Koestoer, Raldi Artono; Adhitya, Mohammad; Roekettino, Ardian; Trianto, Bayu
Makara Journal of Technology Vol. 13, No. 2
Publisher : UI Scholars Hub

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Abstract

Potency of Thermoelectric Generator for Hybrid Vehicle. Thermoelectric Generator (TEG) has been known as electricity generation for many years. If the temperature difference occurred between two difference semi conductor materials, the current will flow in the material and produced difference voltage. This principle is known as Seebeck effect that is the opposite of Peltier effect Thermoelectric Cooling (TEC). This research was conducted to test the potential of electric source from twelve peltier modules. Then, these thermoelectric generators were applied in hybrid car by using waste heat from the combustion engine. The experiment has been conducted with variations of peltier module arrangements (series and parallels) and heater as heat source for the thermoelectric generator, with variations of heater voltage input (110V and 220V) applied. The experimental result showed that twelve of peltier modules arranged in series and heater voltage of 220V generated power output of 8.11 Watts with average temperature difference of 42.82°C. This result shows that TEG has a bright prospect as alternative electric source.
Heat gain reduction and cooling energy minimization through building envelope material Muthiah Hakim Hadini; Ova Candra Dewi; Nandy Setiadi Djaya Putra; Tika Hanjani
ARTEKS : Jurnal Teknik Arsitektur Vol 8 No 1 (2023): ARTEKS : Jurnal Teknik Arsitektur | Januari 2023 ~ April 2023
Publisher : Program Studi Arsitektur Fakultas Teknik Universitas Katolik Widya Mandira

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30822/arteks.v8i1.1910

Abstract

This study aims to reduce heat gain and minimise cooling energy through building envelope material as a passive design intervention strategy to achieve thermal comfort. Integrated Learning Building in the Faculty of Engineering, Universitas Indonesia, is used as a case study due to its air conditioning setting. First, the material characteristic of the building envelope is calculated using the Overall Thermal Transmission Value (OTTV) calculation to determine heat gain and the EDGE (Excellence in Design for Greater Efficiencies), a software to estimate cooling energy consumption. Then, a passive design intervention strategy is performed by adding insulation (polyester, bagasse, and recycled textile and paper) and substituting window glazing (reflective, PVB laminated, and Clear IGU Low-E). The results show that the combination of recycled textile and paper insulation and clear IGU Low-E window glazing has an OTTV value of 24.89 W/m2 which is lower than the standard in Indonesia (35 W/m2). Meanwhile, the cooling energy usage shows an energy consumption of 1.14% lower, but it did not achieve the 5% reduction target. Therefore, further intervention on other parts of the building envelope, such as the roof and floor, should be observed to achieve higher energy-saving potential.
Enhancing the accuracy of low-cost thermocouple devices through deep-wavelet neural network calibration Julian, James; Wahyuni, Fitri; Dewantara, Annastya Bagas; Winarta, Adi; Putra, Nandy
International Journal of Electrical and Computer Engineering (IJECE) Vol 14, No 3: June 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v14i3.pp2625-2633

Abstract

Data collection using thermocouple sensors in low-cost data acquisition is prone to noise interference, which could reduce the data quality. Noise sources such as cold junction compensators, electromagnetic interference, and Johnson noise can significantly affect the reliability and accuracy of conventional measurements. This study aims to improve the quality of thermocouple sensor readings on low-cost data acquisition using calibration method based on deep learning and the denoising process using a wavelet transform. This taken approach successfully increase the accuracy value of 97.67% with a mean absolute error (MAE) of 0.2. The precision also increases of 262.7% as indicated by the result of signal-to-noise ratio (SNR) with a value of 105.29 dB. Comparative analysis was carried out against National Instruments® device and it was found that deep-wavelet method had a lower and higher of MAE and SNRdB values of 16.67% and 0.8% respectively. This study shows that the denoising-calibration method with deep-wavelet can improve the accuracy and reliability of data from low-cost thermocouple devices.
Optimalisasi pendinginan pasif dengan dual evaporator loop heat pipes: studi visualisasi dengan radiografi neutron Fathoni, Andhy M.; Hendrayanto, Priska A.; Ramadhan, Ranggi S.; Putra, Nandy
Prosiding SNTTM Vol 22 No 1 (2024): SNTTM XXII Oktober 2024
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/590646

Abstract

In this study, a dual evaporator loop heat pipe (DE-LHP) was developed to accommodate multiple heat sources from a single electronic device. Loop heat pipe (LHP) operation involves complex hydrody-namic phenomena, especially in scenarios involving numerous vapor-liquid interfaces. The complexity of LHPs depends on various elements, such as device design, orientation to gravity, selection of work-ing fluids, heat loads, and condenser cooling conditions. The accuracy of virtual representations in cap-turing the actual hydrodynamic behavior of a working LHP needs to be improved, hampering the de-velopment of precise modeling and design methodologies. This study on thermal performance alone needs to provide a comprehensive picture. Therefore, using visualization is important because research on visualization of working fluid behavior in two phases still needs to be completed. Therefore, neu-tron radiography is used in this experiment to observe the boiling and fluid dynamics in the heat pipe because it has advantages over other visualization methods. Copper material is used to develop the DE-LHP. The capillary wick used is made of stainless steel screen mesh. Deionized water with a 50% filling ratio is selected as the working fluid. To understand the flow behavior phenomenon under steady-state conditions, the heat load varies in a constant temperature range of 40-120oC. Three cartridge heaters simulate multiple heat sources and are controlled using a PID controller. The results show that the pro-posed DE-LHP can function well, accommodate multiple heat sources, and maintain stable performance over a wide range of constant temperatures. Neutron radiography images reveal essential details about the working fluid distribution during operation. The photos also show interesting findings, such as steam pulses and entrained working fluid in the vapor chamber and channels.
Co-Authors Abral, Hairul Adi Winarta, Adi Agus Pamitran, Agus Anhar Riza Antariksawan Anhar Riza Antariksawan Ardian Roekettino Ardian Roekettino, Ardian Ary Maulana Bambang Suryawan Bambang Suryawan, Bambang Bayu Trianto Bayu Trianto, Bayu Cahyo Setyo Wibowo Cukup Mulyana Dedy Haryanto Dewantara, Annastya Bagas Dewi, Ova Candra Dr.Anhar Riza Antariksawan Engkos K Erwin Prawiro, Erwin Fathoni, Andhy M Fathoni, Andhy M. Firdaus Ali Fitri Wahyuni Gerry Julian Hakim, Imansyah Ibnu Hendrayanto, Priska A. Hendri D.S. Budiono I Made Kartika D Imansyah Ibnu Hakim James Julian Kartika D, I Made Luh Putu Ratna Sundari M. Hadi Kusuma Mohammad Adhitya, Mohammad Muhamad Asvial Muhammad Amin Muhammad Amin Mukhsinun Hadi Kusuma Mulya Juarsa Muthiah Hakim Hadini Putra, Gerardo Janitra Puriadi RA. Koestoer Raldi Artono Koestor Ramadhan, Ranggi S. Rezqi, Khairu Riana Ayu Kusumadewi Ridho Irwansyah Riska Khalisa Rosari Saleh Setyo Sarwanto Moersidik Shafira Budiningsih Siregar, Yasmine Karenita Sucipta Laksono Surip Widodo Tika Hanjani Wayan Nata Septiadi Wayan Nata Septiadi Wibowo, Cahyo Setyo Widi Ajeng Luthfiyya